| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) | |||||||
| Title of each class | Trading Symbol(s) | Name of exchange on which registered | ||||||||||||
| x | Accelerated filer | ☐ | Non-accelerated filer | ☐ | |||||||||||||
| Smaller reporting company | Emerging growth company | ||||||||||||||||
| Page Number | ||||||||
| Item 1. | ||||||||
| Item 2. | ||||||||
| Item 3. | ||||||||
| Item 4. | ||||||||
Item 1A. | ||||||||
| Item 2. | ||||||||
| Item 5. | ||||||||
| Item 6. | ||||||||
| March 31, 2026 | December 31, 2025 | ||||||||||
| (dollars in thousands) | (unaudited) | ||||||||||
| ASSETS | |||||||||||
| Investments, at estimated fair value: | |||||||||||
Fixed maturity securities, available-for-sale (amortized cost of $ | $ | $ | |||||||||
Equity securities (cost of $ | |||||||||||
| Short-term investments, available-for-sale (estimated fair value approximates cost) | |||||||||||
| Total Investments | |||||||||||
| Cash and cash equivalents | |||||||||||
| Restricted cash and cash equivalents | |||||||||||
| Receivables | |||||||||||
| Reinsurance recoverables | |||||||||||
| Deferred policy acquisition costs | |||||||||||
| Prepaid reinsurance premiums | |||||||||||
| Goodwill | |||||||||||
| Intangible assets | |||||||||||
| Other assets | |||||||||||
| Total Assets | $ | $ | |||||||||
| LIABILITIES AND EQUITY | |||||||||||
| Unpaid losses and loss adjustment expenses | $ | $ | |||||||||
| Unearned premiums | |||||||||||
| Payables to insurance and reinsurance companies | |||||||||||
Senior long-term debt and other debt (estimated fair value of $ | |||||||||||
| Other liabilities | |||||||||||
| Total Liabilities | |||||||||||
| Redeemable noncontrolling interests | |||||||||||
| Commitments and contingencies | |||||||||||
| Shareholders' equity: | |||||||||||
| Common stock | |||||||||||
| Retained earnings | |||||||||||
| Accumulated other comprehensive loss | ( | ( | |||||||||
| Total Shareholders' Equity | |||||||||||
| Noncontrolling interests | ( | ( | |||||||||
| Total Equity | |||||||||||
| Total Liabilities and Equity | $ | $ | |||||||||
| Three Months Ended March 31, | |||||||||||
| 2026 | 2025 | ||||||||||
| (dollars in thousands, except per share data) | |||||||||||
| OPERATING REVENUES | |||||||||||
| Earned premiums | $ | $ | |||||||||
| Net investment income | |||||||||||
| Products revenues | |||||||||||
| Services and other revenues | |||||||||||
| Total Operating Revenues | |||||||||||
| Net investment losses | ( | ( | |||||||||
| OPERATING EXPENSES | |||||||||||
| Losses and loss adjustment expenses | |||||||||||
| Underwriting, acquisition, and insurance expenses | |||||||||||
| Products expenses | |||||||||||
| Services and other expenses | |||||||||||
| Amortization of acquired intangible assets | |||||||||||
| Total Operating Expenses | |||||||||||
| Operating Income (Loss) | ( | ||||||||||
| Interest expense | ( | ( | |||||||||
| Net foreign exchange gains (losses) | ( | ||||||||||
| Income (Loss) Before Income Taxes | ( | ||||||||||
| Income tax (expense) benefit | ( | ||||||||||
| Net Income (Loss) | ( | ||||||||||
| Net income attributable to noncontrolling interests | ( | ( | |||||||||
| Net Income (Loss) to Shareholders | ( | ||||||||||
| OTHER COMPREHENSIVE INCOME (LOSS) | |||||||||||
| Change in net unrealized losses on available-for-sale investments, net of taxes | ( | ||||||||||
| Other, net of taxes | |||||||||||
| Total Other Comprehensive Income (Loss) | ( | ||||||||||
| Comprehensive Income (Loss) | ( | ||||||||||
| Comprehensive income attributable to noncontrolling interests | ( | ( | |||||||||
| Comprehensive Income (Loss) to Shareholders | $ | ( | $ | ||||||||
| NET INCOME (LOSS) PER COMMON SHARE | |||||||||||
| Basic | $ | ( | $ | ||||||||
| Diluted | $ | ( | $ | ||||||||
| Three Months Ended March 31, 2026 | Common Stock | Retained Earnings | Accumulated Other Comprehensive Loss | Total Shareholders' Equity | Noncontrolling Interests | Total Equity | Redeemable Noncontrolling Interests | ||||||||||||||||||||||||||||||||||
| (dollars in thousands) | |||||||||||||||||||||||||||||||||||||||||
| December 31, 2025 | $ | $ | $ | ( | $ | $ | ( | $ | $ | ||||||||||||||||||||||||||||||||
| Net income (loss) | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||
| Other comprehensive income (loss) | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||
| Comprehensive income (loss) | ( | ( | |||||||||||||||||||||||||||||||||||||||
| Repurchase of common stock | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||
Equity awards expensed | |||||||||||||||||||||||||||||||||||||||||
| Adjustment of redeemable noncontrolling interests | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||
| Purchase of noncontrolling interests | ( | ||||||||||||||||||||||||||||||||||||||||
| Other | ( | ( | ( | ( | ( | ||||||||||||||||||||||||||||||||||||
| March 31, 2026 | $ | $ | $ | ( | $ | $ | ( | $ | $ | ||||||||||||||||||||||||||||||||
| Three Months Ended March 31, 2025 | Preferred Stock | Common Stock | Retained Earnings | Accumulated Other Comprehensive Loss | Total Shareholders' Equity | Noncontrolling Interests | Total Equity | Redeemable Noncontrolling Interests | |||||||||||||||||||||||||||||||||||||||
| (dollars in thousands) | |||||||||||||||||||||||||||||||||||||||||||||||
| December 31, 2024 | $ | $ | $ | $ | ( | $ | $ | $ | $ | ||||||||||||||||||||||||||||||||||||||
| Net income | |||||||||||||||||||||||||||||||||||||||||||||||
| Other comprehensive income (loss) | ( | ||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income | |||||||||||||||||||||||||||||||||||||||||||||||
| Repurchase of common stock | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||||||||
Equity awards expensed | |||||||||||||||||||||||||||||||||||||||||||||||
| Acquisition of EPI | |||||||||||||||||||||||||||||||||||||||||||||||
| Adjustment of redeemable noncontrolling interests | ( | ||||||||||||||||||||||||||||||||||||||||||||||
| Other | ( | ( | ( | ( | ( | ||||||||||||||||||||||||||||||||||||||||||
| March 31, 2025 | $ | $ | $ | $ | ( | $ | $ | $ | $ | ||||||||||||||||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||
| 2026 | 2025 | ||||||||||
(dollars in thousands) | |||||||||||
| OPERATING ACTIVITIES | |||||||||||
| Net income (loss) | $ | ( | $ | ||||||||
| Adjustments to reconcile net income (loss) to net cash provided by operating activities | |||||||||||
| Net Cash Provided By Operating Activities | |||||||||||
| INVESTING ACTIVITIES | |||||||||||
Proceeds from sales, maturities, calls, and prepayments of fixed maturity securities | |||||||||||
| Cost of fixed maturity securities purchased | ( | ( | |||||||||
| Proceeds from sales of equity securities | |||||||||||
| Cost of equity securities purchased | ( | ( | |||||||||
| Net change in short-term investments | |||||||||||
| Additions to property and equipment | ( | ( | |||||||||
| Acquisitions, net of cash acquired | ( | ||||||||||
| Other | ( | ||||||||||
| Net Cash Provided (Used) By Investing Activities | ( | ||||||||||
| FINANCING ACTIVITIES | |||||||||||
| Additions to senior long-term debt and other debt | |||||||||||
| Repayment of senior long-term debt and other debt | ( | ( | |||||||||
| Repurchases of common stock | ( | ( | |||||||||
| Other | ( | ||||||||||
| Net Cash Used By Financing Activities | ( | ( | |||||||||
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents | ( | ||||||||||
| Increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents | ( | ||||||||||
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period | |||||||||||
CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD | $ | $ | |||||||||
| Three Months Ended March 31, 2026 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate and eliminations | Consolidated | |||||||||||||||||||||||||||||
| Earned premiums | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Net investment income | |||||||||||||||||||||||||||||||||||
| Products revenues | |||||||||||||||||||||||||||||||||||
| Services and other revenues | |||||||||||||||||||||||||||||||||||
| Total operating revenues | |||||||||||||||||||||||||||||||||||
| Losses and loss adjustment expenses: | |||||||||||||||||||||||||||||||||||
Current accident year - attritional | ( | ( | ( | ||||||||||||||||||||||||||||||||
Current accident year - catastrophe (1) | ( | ( | |||||||||||||||||||||||||||||||||
| Prior accident years | ( | ||||||||||||||||||||||||||||||||||
Underwriting, acquisition, and insurance expenses: | |||||||||||||||||||||||||||||||||||
| Amortization of policy acquisition costs | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Other underwriting expenses | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Products expenses | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Services and other expenses | ( | ( | ( | ( | ( | ( | |||||||||||||||||||||||||||||
| Adjusted operating income | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Net investment losses | ( | ||||||||||||||||||||||||||||||||||
| Amortization of acquired intangible assets | ( | ||||||||||||||||||||||||||||||||||
| Interest expense | ( | ||||||||||||||||||||||||||||||||||
| Net foreign exchange gains | |||||||||||||||||||||||||||||||||||
| Loss before income taxes | $ | ( | |||||||||||||||||||||||||||||||||
| Three Months Ended March 31, 2026 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate | Consolidated | |||||||||||||||||||||||||||||
| Net investment gains (losses) | $ | ( | $ | $ | $ | $ | ( | $ | ( | ||||||||||||||||||||||||||
| Three Months Ended March 31, 2025 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate and eliminations | Consolidated | |||||||||||||||||||||||||||||
| Earned premiums | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Net investment income | |||||||||||||||||||||||||||||||||||
| Products revenues | |||||||||||||||||||||||||||||||||||
| Services and other revenues | |||||||||||||||||||||||||||||||||||
| Total operating revenues | |||||||||||||||||||||||||||||||||||
| Losses and loss adjustment expenses: | |||||||||||||||||||||||||||||||||||
Current accident year - attritional | ( | ( | ( | ||||||||||||||||||||||||||||||||
Current accident year - catastrophe | ( | ( | |||||||||||||||||||||||||||||||||
| Prior accident years | |||||||||||||||||||||||||||||||||||
Underwriting, acquisition, and insurance expenses: | |||||||||||||||||||||||||||||||||||
| Amortization of policy acquisition costs | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Other underwriting expenses | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Products expenses | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Services and other expenses | ( | ( | ( | ( | ( | ||||||||||||||||||||||||||||||
| Adjusted operating income | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Net investment losses | ( | ||||||||||||||||||||||||||||||||||
| Amortization of acquired intangible assets | ( | ||||||||||||||||||||||||||||||||||
| Interest expense | ( | ||||||||||||||||||||||||||||||||||
| Net foreign exchange losses | ( | ||||||||||||||||||||||||||||||||||
| Income before income taxes | $ | ||||||||||||||||||||||||||||||||||
| Three Months Ended March 31, 2025 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate | Consolidated | |||||||||||||||||||||||||||||
| Net investment gains (losses) | $ | ( | $ | $ | $ | $ | $ | ( | |||||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
Industrial | $ | $ | |||||||||
Consumer and Other | $ | $ | |||||||||
| (dollars in thousands) | March 31, 2026 | December 31, 2025 | |||||||||
| Segment assets: | |||||||||||
| Markel Insurance | $ | $ | |||||||||
| Industrial | |||||||||||
| Financial | |||||||||||
| Consumer and Other | |||||||||||
| Total segment assets | |||||||||||
| Corporate and eliminations | |||||||||||
| Total assets | $ | $ | |||||||||
| March 31, 2026 | |||||||||||||||||||||||
| (dollars in thousands) | Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Estimated Fair Value | |||||||||||||||||||
| Fixed maturity securities: | |||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | $ | ( | $ | ||||||||||||||||||
| U.S. government-sponsored enterprises | ( | ||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | ( | ||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | ( | ||||||||||||||||||||||
| Agency mortgage-backed securities | ( | ||||||||||||||||||||||
| Non-agency mortgage-backed securities | ( | ||||||||||||||||||||||
| Corporate and university bonds | ( | ||||||||||||||||||||||
| Total fixed maturity securities | ( | ||||||||||||||||||||||
| Short-term investments | ( | ||||||||||||||||||||||
| Investments, available-for-sale | $ | $ | $ | ( | $ | ||||||||||||||||||
| December 31, 2025 | |||||||||||||||||||||||
| (dollars in thousands) | Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Estimated Fair Value | |||||||||||||||||||
| Fixed maturity securities: | |||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | $ | ( | $ | ||||||||||||||||||
| U.S. government-sponsored enterprises | ( | ||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | ( | ||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | ( | ||||||||||||||||||||||
| Agency mortgage-backed securities | ( | ||||||||||||||||||||||
| Non-agency mortgage-backed securities | ( | ||||||||||||||||||||||
| Corporate and university bonds | ( | ||||||||||||||||||||||
| Total fixed maturity securities | ( | ||||||||||||||||||||||
| Short-term investments | ( | ||||||||||||||||||||||
| Investments, available-for-sale | $ | $ | $ | ( | $ | ||||||||||||||||||
| March 31, 2026 | |||||||||||||||||||||||||||||||||||
| Less than 12 months | 12 months or longer | Total | |||||||||||||||||||||||||||||||||
| (dollars in thousands) | Estimated Fair Value | Gross Unrealized Holding Losses | Estimated Fair Value | Gross Unrealized Holding Losses | Estimated Fair Value | Gross Unrealized Holding Losses | |||||||||||||||||||||||||||||
| Fixed maturity securities: | |||||||||||||||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | ( | $ | $ | ( | $ | $ | ( | ||||||||||||||||||||||||||
| U.S. government-sponsored enterprises | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Agency mortgage-backed securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Non-agency mortgage-backed securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Corporate and university bonds | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Total fixed maturity securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Short-term investments | ( | ( | |||||||||||||||||||||||||||||||||
| Total | $ | $ | ( | $ | $ | ( | $ | $ | ( | ||||||||||||||||||||||||||
| December 31, 2025 | |||||||||||||||||||||||||||||||||||
| Less than 12 months | 12 months or longer | Total | |||||||||||||||||||||||||||||||||
| (dollars in thousands) | Estimated Fair Value | Gross Unrealized Holding Losses | Estimated Fair Value | Gross Unrealized Holding Losses | Estimated Fair Value | Gross Unrealized Holding Losses | |||||||||||||||||||||||||||||
| Fixed maturity securities: | |||||||||||||||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | ( | $ | $ | ( | $ | $ | ( | ||||||||||||||||||||||||||
| U.S. government-sponsored enterprises | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Agency mortgage-backed securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Non-agency mortgage-backed securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Corporate and university bonds | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Total fixed maturity securities | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Short-term investments | ( | ( | |||||||||||||||||||||||||||||||||
| Total | $ | $ | ( | $ | $ | ( | $ | $ | ( | ||||||||||||||||||||||||||
| (dollars in thousands) | Amortized Cost | Estimated Fair Value | |||||||||
| Due in one year or less | $ | $ | |||||||||
| Due after one year through five years | |||||||||||
| Due after five years through ten years | |||||||||||
| Due after ten years | |||||||||||
Mortgage-backed securities | |||||||||||
| Total fixed maturity securities | $ | $ | |||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Interest: | |||||||||||
| Fixed maturity securities | $ | $ | |||||||||
| Short-term investments | |||||||||||
| Cash and cash equivalents and restricted cash and cash equivalents | |||||||||||
| Dividends on equity securities | |||||||||||
| Investment expenses | ( | ( | |||||||||
| Net investment income | $ | $ | |||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
Fixed maturity securities and short-term investments: | |||||||||||
| Net realized investment gains (losses) | $ | $ | ( | ||||||||
| Equity securities: | |||||||||||
| Change in fair value of securities sold during the period | ( | ( | |||||||||
| Change in fair value of securities held at the end of the period | ( | ( | |||||||||
| Total change in fair value | ( | ( | |||||||||
| Net investment losses | $ | ( | $ | ( | |||||||
| Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): | |||||||||||
| Fixed maturity securities | $ | ( | $ | ||||||||
| Short-term investments | ( | ||||||||||
| Net increase (decrease) | $ | ( | $ | ||||||||
| March 31, 2026 | |||||||||||||||||||||||
| (dollars in thousands) | Level 1 | Level 2 | Level 3 | Total | |||||||||||||||||||
| Assets: | |||||||||||||||||||||||
| Investments: | |||||||||||||||||||||||
| Fixed maturity securities, available-for-sale: | |||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | $ | $ | |||||||||||||||||||
| U.S. government-sponsored enterprises | |||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | |||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | |||||||||||||||||||||||
| Agency mortgage-backed securities | |||||||||||||||||||||||
| Non-agency mortgage-backed securities | |||||||||||||||||||||||
| Corporate and university bonds | |||||||||||||||||||||||
| Total fixed maturity securities, available-for-sale | |||||||||||||||||||||||
| Equity securities: | |||||||||||||||||||||||
| Insurance, banks, and other financial institutions | |||||||||||||||||||||||
| Industrial, consumer, and all other | |||||||||||||||||||||||
| Total equity securities | |||||||||||||||||||||||
| Short-term investments, available-for-sale | |||||||||||||||||||||||
| Total investments | $ | $ | $ | $ | |||||||||||||||||||
| December 31, 2025 | |||||||||||||||||||||||
| (dollars in thousands) | Level 1 | Level 2 | Level 3 | Total | |||||||||||||||||||
| Assets: | |||||||||||||||||||||||
| Investments: | |||||||||||||||||||||||
| Fixed maturity securities, available-for-sale: | |||||||||||||||||||||||
| U.S. Treasury securities | $ | $ | $ | $ | |||||||||||||||||||
| U.S. government-sponsored enterprises | |||||||||||||||||||||||
| Obligations of states, municipalities, and political subdivisions | |||||||||||||||||||||||
| Foreign governments, agencies, and supranationals | |||||||||||||||||||||||
| Agency mortgage-backed securities | |||||||||||||||||||||||
| Non-agency mortgage-backed securities | |||||||||||||||||||||||
| Corporate and university bonds | |||||||||||||||||||||||
| Total fixed maturity securities, available-for-sale | |||||||||||||||||||||||
| Equity securities: | |||||||||||||||||||||||
| Insurance, banks, and other financial institutions | |||||||||||||||||||||||
| Industrial, consumer, and all other | |||||||||||||||||||||||
| Total equity securities | |||||||||||||||||||||||
| Short-term investments, available-for-sale | |||||||||||||||||||||||
| Total investments | $ | $ | $ | $ | |||||||||||||||||||
| Three Months Ended March 31, 2026 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate | Total | |||||||||||||||||||||||||||||
| Products | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Services | |||||||||||||||||||||||||||||||||||
| Management fees | |||||||||||||||||||||||||||||||||||
| Total revenues from contracts with customers | |||||||||||||||||||||||||||||||||||
| Leasing revenues | |||||||||||||||||||||||||||||||||||
| Fronting fees | |||||||||||||||||||||||||||||||||||
Equity method and other investments income (loss) | ( | ( | ( | ||||||||||||||||||||||||||||||||
| Other | ( | ||||||||||||||||||||||||||||||||||
| Total products, services, and other revenues | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Three Months Ended March 31, 2025 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Industrial | Financial | Consumer and Other | Corporate | Total | |||||||||||||||||||||||||||||
| Products | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Services | |||||||||||||||||||||||||||||||||||
| Management fees | |||||||||||||||||||||||||||||||||||
| Total revenues from contracts with customers | |||||||||||||||||||||||||||||||||||
| Leasing revenues | |||||||||||||||||||||||||||||||||||
| Fronting fees | |||||||||||||||||||||||||||||||||||
Equity method and other investments income (loss) | ( | ||||||||||||||||||||||||||||||||||
| Other | |||||||||||||||||||||||||||||||||||
| Total products, services, and other revenues | $ | $ | $ | $ | $ | $ | |||||||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Gross reserves for losses and loss adjustment expenses, beginning of year | $ | $ | |||||||||
| Reinsurance recoverables on unpaid losses, beginning of year | |||||||||||
| Net reserves for losses and loss adjustment expenses, beginning of year | |||||||||||
| Effect of foreign currency rate changes on beginning of year balance | ( | ||||||||||
| Adjusted net reserves for losses and loss adjustment expenses, beginning of year | |||||||||||
| Incurred losses and loss adjustment expenses: | |||||||||||
| Current accident year | |||||||||||
| Prior accident years | ( | ( | |||||||||
| Total incurred losses and loss adjustment expenses | |||||||||||
| Payments: | |||||||||||
| Current accident year | |||||||||||
| Prior accident years | |||||||||||
| Total payments | |||||||||||
| Effect of foreign currency rate changes on current year activity | ( | ||||||||||
Change in net reserves for losses and loss adjustment expenses of Markel CATCo Re | ( | ||||||||||
Retroactive reinsurance transaction with Hagerty Re | ( | ||||||||||
| Net reserves for losses and loss adjustment expenses, end of period | |||||||||||
Reinsurance recoverables on unpaid losses, end of period | |||||||||||
| Gross reserves for losses and loss adjustment expenses, end of period | $ | $ | |||||||||
| Three Months Ended March 31, | |||||||||||||||||||||||||||||||||||||||||||||||
| 2026 | 2025 | ||||||||||||||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Direct | Assumed | Ceded | Net Premiums | Direct | Assumed | Ceded | Net Premiums | |||||||||||||||||||||||||||||||||||||||
| Underwriting: | |||||||||||||||||||||||||||||||||||||||||||||||
| Written | $ | $ | $ | ( | $ | $ | $ | $ | ( | $ | |||||||||||||||||||||||||||||||||||||
| Earned | $ | $ | $ | ( | $ | $ | $ | $ | ( | $ | |||||||||||||||||||||||||||||||||||||
Fronting: | |||||||||||||||||||||||||||||||||||||||||||||||
| Written | ( | ( | |||||||||||||||||||||||||||||||||||||||||||||
| Earned | ( | ( | |||||||||||||||||||||||||||||||||||||||||||||
| Consolidated: | |||||||||||||||||||||||||||||||||||||||||||||||
| Written | $ | $ | $ | ( | $ | $ | $ | $ | ( | $ | |||||||||||||||||||||||||||||||||||||
| Earned | $ | $ | $ | ( | $ | $ | $ | $ | ( | $ | |||||||||||||||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||
| 2026 | 2025 | ||||||||||
Ceded earned premiums to gross earned premiums | % | % | |||||||||
Assumed earned premiums to net earned premiums | % | % | |||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Gross losses and loss adjustment expenses | $ | $ | |||||||||
| Ceded losses and loss adjustment expenses | ( | ( | |||||||||
| Net losses and loss adjustment expenses | $ | $ | |||||||||
| Three Months Ended March 31, | |||||||||||
(in ones) | 2026 | 2025 | |||||||||
| Issued and outstanding common shares, beginning of period | |||||||||||
| Issuance of common shares | |||||||||||
| Repurchase of common shares | ( | ( | |||||||||
| Issued and outstanding common shares, end of period | |||||||||||
| Three Months Ended March 31, | |||||||||||
| (in thousands, except per share amounts) | 2026 | 2025 | |||||||||
| Net income (loss) to shareholders | $ | ( | $ | ||||||||
Adjustment and purchase of redeemable noncontrolling interests | ( | ||||||||||
| Adjusted net income (loss) to shareholders | $ | ( | $ | ||||||||
Weighted average basic common shares outstanding | |||||||||||
Weighted average dilutive potential common shares from restricted stock units and restricted stock (1) | |||||||||||
Weighted average diluted common shares outstanding | |||||||||||
| Basic net income (loss) per common share | $ | ( | $ | ||||||||
Diluted net income (loss) per common share (1) | $ | ( | $ | ||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
Markel Insurance | $ | 2,201,685 | $ | 2,226,676 | |||||||
Industrial | 883,058 | 829,574 | |||||||||
Financial | 161,530 | 178,481 | |||||||||
Consumer and Other | 280,497 | 287,786 | |||||||||
Corporate and eliminations | 23,835 | 25,659 | |||||||||
| Total operating revenues | $ | 3,550,605 | $ | 3,548,176 | |||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
Operating income (loss) | $ | (273,329) | $ | 282,524 | |||||||
| Add: Amortization of acquired intangible assets | 43,513 | 46,942 | |||||||||
| Less: Net investment losses | (727,562) | (149,071) | |||||||||
Adjusted operating income | $ | 497,746 | $ | 478,537 | |||||||
| Markel Insurance | $ | 369,490 | $ | 282,115 | |||||||
| Industrial | 49,286 | 58,764 | |||||||||
| Financial | 36,205 | 79,611 | |||||||||
| Consumer and Other | 39,755 | 32,388 | |||||||||
| Corporate and eliminations | 3,010 | 25,659 | |||||||||
Adjusted operating income | $ | 497,746 | $ | 478,537 | |||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
Operating income (loss) | $ | (273,329) | $ | 282,524 | |||||||
| Interest expense | (50,886) | (52,140) | |||||||||
| Net foreign exchange gains (losses) | 54,277 | (72,633) | |||||||||
| Income tax (expense) benefit | 65,582 | (28,404) | |||||||||
| Net income attributable to noncontrolling interests | (7,933) | (7,633) | |||||||||
| Net income (loss) to shareholders | (212,289) | 121,714 | |||||||||
| Other comprehensive income (loss) to shareholders | (128,141) | 225,956 | |||||||||
| Comprehensive income (loss) to shareholders | $ | (340,430) | $ | 347,670 | |||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Earned premiums | $ | 1,969,339 | $ | 2,016,539 | |||||||
| Net investment income | 229,619 | 207,517 | |||||||||
| Services and other revenues | 2,727 | 2,620 | |||||||||
| Operating revenues | $ | 2,201,685 | $ | 2,226,676 | |||||||
| Losses and loss adjustment expenses | (1,113,999) | (1,212,750) | |||||||||
Underwriting, acquisition, and insurance expenses | (713,091) | (723,627) | |||||||||
| Services and other expenses | (5,105) | (8,184) | |||||||||
| Adjusted operating income | $ | 369,490 | $ | 282,115 | |||||||
Combined ratio | 93 | % | 96 | % | |||||||
| Three Months Ended March 31, | |||||||||||||||||
| (dollars in thousands) | 2026 | 2025 | % Change | ||||||||||||||
| Gross premium volume | $ | 2,802,995 | $ | 3,171,551 | (12) | % | |||||||||||
| Underwriting | $ | 2,215,573 | $ | 2,793,406 | (21) | % | |||||||||||
Adjusted underwriting (1) | $ | 2,192,993 | $ | 1,996,551 | 10 | % | |||||||||||
| Fronting | $ | 587,422 | $ | 378,145 | 55 | % | |||||||||||
| Net written premiums | $ | 1,771,228 | $ | 2,238,676 | (21) | % | |||||||||||
| Earned premiums | $ | 1,969,339 | $ | 2,016,539 | (2) | % | |||||||||||
| Underwriting profit | $ | 142,249 | $ | 80,162 | 77 | % | |||||||||||
| Services and other income (loss) | $ | 2,966 | $ | (3,880) | NM (2) | ||||||||||||
Underwriting Ratios (3) | Point Change | ||||||||||||||||
| Loss ratio | |||||||||||||||||
| Current accident year loss ratio | 62.0 | % | 67.5 | % | (5.5) | ||||||||||||
| Prior accident years loss ratio | (5.4) | % | (7.4) | % | 2.0 | ||||||||||||
| Loss ratio | 56.6 | % | 60.1 | % | (3.5) | ||||||||||||
| Expense ratio | 36.2 | % | 35.9 | % | 0.3 | ||||||||||||
| Combined ratio | 92.8 | % | 96.0 | % | (3.2) | ||||||||||||
Current accident year loss ratio catastrophe impact (4) | 1.8 | % | 3.3 | % | (1.5) | ||||||||||||
Current accident year loss ratio, excluding catastrophe impact (1) | 60.2 | % | 64.2 | % | (4.0) | ||||||||||||
Combined ratio, excluding current accident year catastrophe impact (1) | 91.0 | % | 92.7 | % | (1.7) | ||||||||||||
| Three Months Ended March 31, 2026 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | U.S. Wholesale and Specialty | Programs and Solutions | International | Global Reinsurance | Other | Markel Insurance | |||||||||||||||||||||||||||||
Gross premium volume - underwriting | $ | 672,673 | $ | 655,856 | $ | 860,985 | $ | 22,580 | $ | 3,479 | $ | 2,215,573 | |||||||||||||||||||||||
Gross premium volume - fronting | — | 510,405 | — | 77,017 | — | 587,422 | |||||||||||||||||||||||||||||
| Gross premium volume | $ | 672,673 | $ | 1,166,261 | $ | 860,985 | $ | 99,597 | $ | 3,479 | $ | 2,802,995 | |||||||||||||||||||||||
| Net written premiums | $ | 588,004 | $ | 499,727 | $ | 713,252 | $ | (33,234) | $ | 3,479 | $ | 1,771,228 | |||||||||||||||||||||||
| Earned premiums | $ | 628,546 | $ | 567,287 | $ | 608,959 | $ | 160,010 | $ | 4,537 | $ | 1,969,339 | |||||||||||||||||||||||
| Losses and loss adjustment expenses: | |||||||||||||||||||||||||||||||||||
| Current accident year - attritional | (389,362) | (348,161) | (320,842) | (125,977) | (1,568) | (1,185,910) | |||||||||||||||||||||||||||||
| Current accident year - catastrophe | — | — | (35,028) | — | — | (35,028) | |||||||||||||||||||||||||||||
| Prior accident years | 23,190 | 35,852 | 60,510 | (13,853) | 1,240 | 106,939 | |||||||||||||||||||||||||||||
Underwriting, acquisition, and insurance expenses | (216,058) | (201,962) | (250,433) | (42,568) | (2,070) | (713,091) | |||||||||||||||||||||||||||||
| Underwriting profit (loss) | $ | 46,316 | $ | 53,016 | $ | 63,166 | $ | (22,388) | $ | 2,139 | $ | 142,249 | |||||||||||||||||||||||
| Services and other revenues | $ | — | $ | 3,340 | $ | 4,364 | $ | 173 | $ | 194 | $ | 8,071 | |||||||||||||||||||||||
| Services and other expenses | — | (2,386) | (722) | — | (1,997) | (5,105) | |||||||||||||||||||||||||||||
| Services and other income (loss) | $ | — | $ | 954 | $ | 3,642 | $ | 173 | $ | (1,803) | $ | 2,966 | |||||||||||||||||||||||
| Current accident year loss ratio | 61.9 | % | 61.4 | % | 58.4 | % | 78.7 | % | 62.0 | % | |||||||||||||||||||||||||
| Prior accident years loss ratio | (3.7) | % | (6.3) | % | (9.9) | % | 8.7 | % | (5.4) | % | |||||||||||||||||||||||||
| Loss ratio | 58.3 | % | 55.1 | % | 48.5 | % | 87.4 | % | 56.6 | % | |||||||||||||||||||||||||
| Expense ratio | 34.4 | % | 35.6 | % | 41.1 | % | 26.6 | % | 36.2 | % | |||||||||||||||||||||||||
| Combined ratio | 92.6 | % | 90.7 | % | 89.6 | % | 114.0 | % | 92.8 | % | |||||||||||||||||||||||||
| Three Months Ended March 31, 2025 | |||||||||||||||||||||||||||||||||||
| (dollars in thousands) | U.S. Wholesale and Specialty | Programs and Solutions | International | Global Reinsurance | Other | Markel Insurance | |||||||||||||||||||||||||||||
Gross premium volume - underwriting | $ | 742,217 | $ | 806,228 | $ | 670,322 | $ | 576,928 | $ | (2,289) | $ | 2,793,406 | |||||||||||||||||||||||
Gross premium volume - fronting | — | 378,145 | — | — | — | 378,145 | |||||||||||||||||||||||||||||
| Gross premium volume | $ | 742,217 | $ | 1,184,373 | $ | 670,322 | $ | 576,928 | $ | (2,289) | $ | 3,171,551 | |||||||||||||||||||||||
| Net written premiums | $ | 605,016 | $ | 544,843 | $ | 572,492 | $ | 517,102 | $ | (777) | $ | 2,238,676 | |||||||||||||||||||||||
| Earned premiums | $ | 662,629 | $ | 567,245 | $ | 509,395 | $ | 274,248 | $ | 3,022 | $ | 2,016,539 | |||||||||||||||||||||||
| Losses and loss adjustment expenses: | |||||||||||||||||||||||||||||||||||
| Current accident year - attritional | (457,656) | (349,767) | (278,072) | (189,859) | (20,169) | (1,295,523) | |||||||||||||||||||||||||||||
| Current accident year - catastrophe | (18,167) | (15,947) | (30,000) | (1,950) | — | (66,064) | |||||||||||||||||||||||||||||
| Prior accident years | 40,526 | 22,173 | 64,636 | 17,674 | 3,828 | 148,837 | |||||||||||||||||||||||||||||
Underwriting, acquisition, and insurance expenses | (225,813) | (208,051) | (209,323) | (77,455) | (2,985) | (723,627) | |||||||||||||||||||||||||||||
| Underwriting profit (loss) | $ | 1,519 | $ | 15,653 | $ | 56,636 | $ | 22,658 | $ | (16,304) | $ | 80,162 | |||||||||||||||||||||||
| Services and other revenues | $ | — | $ | 3,410 | $ | 1,097 | $ | — | $ | (203) | $ | 4,304 | |||||||||||||||||||||||
| Services and other expenses | — | (2,440) | (2,800) | — | (2,944) | (8,184) | |||||||||||||||||||||||||||||
| Services and other income (loss) | $ | — | $ | 970 | $ | (1,703) | $ | — | $ | (3,147) | $ | (3,880) | |||||||||||||||||||||||
| Current accident year loss ratio | 71.8 | % | 64.5 | % | 60.5 | % | 69.9 | % | 67.5 | % | |||||||||||||||||||||||||
| Prior accident years loss ratio | (6.1) | % | (3.9) | % | (12.7) | % | (6.4) | % | (7.4) | % | |||||||||||||||||||||||||
| Loss ratio | 65.7 | % | 60.6 | % | 47.8 | % | 63.5 | % | 60.1 | % | |||||||||||||||||||||||||
| Expense ratio | 34.1 | % | 36.7 | % | 41.1 | % | 28.2 | % | 35.9 | % | |||||||||||||||||||||||||
| Combined ratio | 99.8 | % | 97.2 | % | 88.9 | % | 91.7 | % | 96.0 | % | |||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||||||||
| (dollars in thousands) | 2026 | 2025 | % Change | ||||||||||||||
| Operating revenues | $ | 883,058 | $ | 829,574 | 6 | % | |||||||||||
| Adjusted operating income | $ | 49,286 | $ | 58,764 | (16) | % | |||||||||||
| Three Months Ended March 31, | |||||||||||||||||
| (dollars in thousands) | 2026 | 2025 | % Change | ||||||||||||||
| Operating revenues | $ | 161,530 | $ | 178,481 | (9) | % | |||||||||||
| Adjusted operating income | $ | 36,205 | $ | 79,611 | (55) | % | |||||||||||
| Three Months Ended March 31, | |||||||||||||||||
| (dollars in thousands) | 2026 | 2025 | % Change | ||||||||||||||
| Operating revenues | $ | 280,497 | $ | 287,786 | (3) | % | |||||||||||
| Adjusted operating income | $ | 39,755 | $ | 32,388 | 23 | % | |||||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Net investment income | $ | 29,847 | $ | 31,616 | |||||||
Other revenues | 6,694 | 5,033 | |||||||||
| Operating revenues | 36,541 | 36,649 | |||||||||
Operating expenses (1) | (20,825) | — | |||||||||
| Corporate adjusted operating income | $ | 15,716 | $ | 36,649 | |||||||
Markel Group consolidating eliminations | (12,706) | (10,990) | |||||||||
| Corporate and eliminations adjusted operating income | $ | 3,010 | $ | 25,659 | |||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Net investment income | $ | 255,890 | $ | 237,095 | |||||||
Yield on fixed maturity securities (1) | 3.7 | % | 3.5 | % | |||||||
Yield on short-term investments (1) | 3.3 | % | 3.8 | % | |||||||
Yield on cash and cash equivalents and restricted cash and cash equivalents (1) | 2.8 | % | 3.4 | % | |||||||
| Net realized investment gains (losses) | $ | 2,043 | $ | (1,801) | |||||||
| Change in fair value of equity securities | (729,605) | (147,270) | |||||||||
| Net investment losses | $ | (727,562) | $ | (149,071) | |||||||
Return on equity securities (2) | (5.2) | % | (0.9) | % | |||||||
| March 31, 2026 | |||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Other Reportable Segments | Corporate | Total | |||||||||||||||||||
| Fixed maturity securities | $ | 17,362,079 | $ | 359,488 | $ | 222,214 | $ | 17,943,781 | |||||||||||||||
| Equity securities | 10,332,779 | — | 1,969,893 | 12,302,672 | |||||||||||||||||||
| Short-term investments | 763,767 | 229,139 | 1,033,241 | 2,026,147 | |||||||||||||||||||
Cash and cash equivalents, including restricted | 2,390,260 | 893,755 | 897,263 | 4,181,278 | |||||||||||||||||||
| Invested assets | $ | 30,848,885 | $ | 1,482,382 | $ | 4,122,611 | $ | 36,453,878 | |||||||||||||||
Intercompany loans receivable | $ | 728,000 | $ | — | $ | 270,637 | |||||||||||||||||
| December 31, 2025 | |||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Other Reportable Segments | Corporate | Total | |||||||||||||||||||
| Fixed maturity securities | $ | 17,184,810 | $ | 371,994 | $ | 241,182 | $ | 17,797,986 | |||||||||||||||
| Equity securities | 10,859,200 | — | 2,145,112 | 13,004,312 | |||||||||||||||||||
| Short-term investments | 757,540 | 229,261 | 1,046,861 | 2,033,662 | |||||||||||||||||||
| Cash and cash equivalents, including restricted | 2,526,820 | 975,829 | 1,100,653 | 4,603,302 | |||||||||||||||||||
| Invested assets | $ | 31,328,370 | $ | 1,577,084 | $ | 4,533,808 | $ | 37,439,262 | |||||||||||||||
Intercompany loans receivable | $ | 728,000 | $ | — | $ | 269,176 | |||||||||||||||||
| Three Months Ended March 31, 2026 | |||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Other Reportable Segments | Corporate | Eliminations | Total | ||||||||||||||||||||||||
Interest: | |||||||||||||||||||||||||||||
| Fixed maturity securities | $ | 159,298 | $ | 2,864 | $ | 2,162 | $ | — | $ | 164,324 | |||||||||||||||||||
| Short-term investments | 5,774 | 1,974 | 9,356 | — | 17,104 | ||||||||||||||||||||||||
| Cash and cash equivalents, including restricted | 18,670 | 4,349 | 7,937 | — | 30,956 | ||||||||||||||||||||||||
| Intercompany loans receivable | 6,668 | — | 6,038 | (12,706) | — | ||||||||||||||||||||||||
Dividends on equity securities | 44,053 | — | 5,283 | — | 49,336 | ||||||||||||||||||||||||
| Investment expenses | (4,844) | (57) | (929) | — | (5,830) | ||||||||||||||||||||||||
| Net investment income | $ | 229,619 | $ | 9,130 | $ | 29,847 | $ | (12,706) | $ | 255,890 | |||||||||||||||||||
Net investment gains (losses) | $ | (553,914) | $ | 369 | $ | (174,017) | $ | — | $ | (727,562) | |||||||||||||||||||
| Three Months Ended March 31, 2025 | |||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | Other Reportable Segments | Corporate | Eliminations | Total | ||||||||||||||||||||||||
Interest: | |||||||||||||||||||||||||||||
| Fixed maturity securities | $ | 140,739 | $ | 1,485 | $ | 1,121 | $ | — | $ | 143,345 | |||||||||||||||||||
| Short-term investments | 5,655 | 2,764 | 11,254 | — | 19,673 | ||||||||||||||||||||||||
| Cash and cash equivalents, including restricted | 24,402 | 4,762 | 10,610 | — | 39,774 | ||||||||||||||||||||||||
| Intercompany loans receivable | 7,020 | — | 3,970 | (10,990) | — | ||||||||||||||||||||||||
Dividends on equity securities | 34,532 | — | 5,663 | — | 40,195 | ||||||||||||||||||||||||
| Investment expenses | (4,831) | (59) | (1,002) | — | (5,892) | ||||||||||||||||||||||||
| Net investment income | $ | 207,517 | $ | 8,952 | $ | 31,616 | $ | (10,990) | $ | 237,095 | |||||||||||||||||||
Net investment gains (losses) | $ | (224,194) | $ | — | $ | 75,123 | $ | — | $ | (149,071) | |||||||||||||||||||
| Three Months Ended March 31, | |||||||||||||||||||||||||||||||||||||||||||||||
| 2026 | 2025 | ||||||||||||||||||||||||||||||||||||||||||||||
| (dollars in thousands) | Markel Insurance | State National | Eliminations | Consolidated | Markel Insurance | State National | Eliminations | Consolidated | |||||||||||||||||||||||||||||||||||||||
Gross premium volume: | |||||||||||||||||||||||||||||||||||||||||||||||
| Underwriting | $ | 2,215,573 | $ | 73,655 | $ | — | $ | 2,289,228 | $ | 2,793,406 | $ | 71,610 | $ | — | $ | 2,865,016 | |||||||||||||||||||||||||||||||
| Fronting | 587,422 | 987,748 | (79,376) | 1,495,794 | 378,145 | 1,028,666 | (53,597) | 1,353,214 | |||||||||||||||||||||||||||||||||||||||
| Total | $ | 2,802,995 | $ | 1,061,403 | $ | (79,376) | $ | 3,785,022 | $ | 3,171,551 | $ | 1,100,276 | $ | (53,597) | $ | 4,218,230 | |||||||||||||||||||||||||||||||
| Earned premiums | $ | 1,969,339 | $ | 79,547 | $ | — | $ | 2,048,886 | $ | 2,016,539 | $ | 72,835 | $ | — | $ | 2,089,374 | |||||||||||||||||||||||||||||||
Losses and loss adjustment expenses | (1,113,999) | (52,818) | — | (1,166,817) | (1,212,750) | (41,915) | — | (1,254,665) | |||||||||||||||||||||||||||||||||||||||
Underwriting, acquisition, and insurance expenses | (713,091) | (26,737) | — | (739,828) | (723,627) | (23,811) | — | (747,438) | |||||||||||||||||||||||||||||||||||||||
| Underwriting profit (loss) | $ | 142,249 | $ | (8) | $ | — | $ | 142,241 | $ | 80,162 | $ | 7,109 | $ | — | $ | 87,271 | |||||||||||||||||||||||||||||||
Combined ratio | 92.8 | % | 100.0 | % | 93.1 | % | 96.0 | % | 90.2 | % | 95.8 | % | |||||||||||||||||||||||||||||||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Amortization of acquired intangible assets | $ | 43,513 | $ | 46,942 | |||||||
| Interest expense | $ | 50,886 | $ | 52,140 | |||||||
| Net foreign exchange (gains) losses | $ | (54,277) | $ | 72,633 | |||||||
Income tax expense (benefit) | $ | (65,582) | $ | 28,404 | |||||||
| Effective tax rate | 24 | % | 18 | % | |||||||
| Three Months Ended March 31, | |||||||||||
| (dollars in thousands) | 2026 | 2025 | |||||||||
| Change in net unrealized losses on available-for-sale investments, net of taxes | $ | (133,821) | $ | 218,377 | |||||||
| Other, net of taxes | 5,717 | 7,552 | |||||||||
| Other comprehensive (income) loss attributable to noncontrolling interests | (37) | 27 | |||||||||
| Other comprehensive income (loss) to shareholders | $ | (128,141) | $ | 225,956 | |||||||
| Three Months Ended March 31, | |||||||||||||||||
| (dollars in thousands) | 2026 | 2025 | % Change | ||||||||||||||
Underwriting gross premium volume | $ | 2,215,573 | $ | 2,793,406 | (21) | % | |||||||||||
| Less: Global Reinsurance division underwriting gross premium volume | 22,580 | 576,928 | |||||||||||||||
| Less: Hagerty underwriting gross premium volume | — | 219,927 | |||||||||||||||
Adjusted underwriting gross premium volume | $ | 2,192,993 | $ | 1,996,551 | 10 | % | |||||||||||
| Three Months Ended March 31, 2026 | |||||
Industrial segment: | |||||
| Revenue growth | 6.4 | % | |||
| Impact of inorganic activity | (2.2) | % | |||
Organic revenue growth | 4.2 | % | |||
Financial segment: | |||||
| Revenue growth | (9.5) | % | |||
| Impact of inorganic activity | 19.2 | % | |||
| Organic revenue growth | 9.7 | % | |||
Consumer and Other segment: | |||||
Revenue growth | (2.5) | % | |||
| Impact of inorganic activity | (3.4) | % | |||
Organic revenue growth | (5.9) | % | |||
| Issuer Purchases of Equity Securities | |||||||||||||||||||||||
| (a) | (b) | (c) | (d) | ||||||||||||||||||||
| Total Number of Shares Purchased | Average Price Paid per Share | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs(1) | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in thousands) | ||||||||||||||||||||
| January 1, 2026 through January 31, 2026 | 13,655 | $ | 2,078.69 | 13,655 | $ | 1,469,143 | |||||||||||||||||
| February 1, 2026 through February 28, 2026 | 23,627 | $ | 2,072.53 | 23,627 | $ | 1,420,175 | |||||||||||||||||
| March 1, 2026 through March 31, 2026 | 25,955 | $ | 1,938.33 | 25,955 | $ | 1,369,866 | |||||||||||||||||
| Total | 63,237 | $ | 2,018.78 | 63,237 | $ | 1,369,866 | |||||||||||||||||
| Exhibit No. | Document Description | ||||
| The registrant hereby agrees to furnish to the Securities and Exchange Commission, upon request, a copy of all other instruments defining the rights of holders of long-term debt of the registrant and its subsidiaries. | |||||
| 101 | The following consolidated financial statements from Markel Group Inc.'s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed on April 28, 2026, formatted in Inline XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income (Loss) and Comprehensive Income (Loss), (iii) Consolidated Statements of Changes in Equity, (iv) Condensed Consolidated Statements of Cash Flows, and (v) Notes to Consolidated Financial Statements.* | ||||
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) | ||||
| Markel Group Inc. | ||||||||
| By: | /s/ Thomas S. Gayner | |||||||
| Thomas S. Gayner | ||||||||
| Chief Executive Officer | ||||||||
| (Principal Executive Officer) | ||||||||
| By: | /s/ Brian J. Costanzo | |||||||
Brian J. Costanzo | ||||||||
| Chief Financial Officer | ||||||||
| (Principal Financial Officer) | ||||||||
| April 28, 2026 | /s/ Thomas S. Gayner | |||||||
| Thomas S. Gayner | ||||||||
| Chief Executive Officer | ||||||||
| (Principal Executive Officer) | ||||||||
| April 28, 2026 | /s/ Brian J. Costanzo | |||||||
Brian J. Costanzo | ||||||||
| Chief Financial Officer | ||||||||
| (Principal Financial Officer) | ||||||||
| April 28, 2026 | /s/ Thomas S. Gayner | ||||
| Thomas S. Gayner | |||||
| Chief Executive Officer | |||||
| (Principal Executive Officer) | |||||
| /s/ Brian J. Costanzo | |||||
| Brian J. Costanzo | |||||
| Chief Financial Officer | |||||
| (Principal Financial Officer) | |||||
Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fixed maturity securities, available-for-sale, amortized cost | $ 18,207,316 | |
| Equity securities, cost | 4,125,927 | $ 4,094,745 |
| Senior long-term debt and other debt, fair value | 3,836,000 | 3,856,000 |
| Fixed Maturity Securities [Member] | ||
| Fixed maturity securities, available-for-sale, amortized cost | $ 18,207,316 | $ 17,895,918 |
Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands |
Total |
Total Equity [Member] |
Total Shareholders' Equity [Member] |
Preferred Stock [Member] |
Common Stock [Member] |
Retained Earnings [Member] |
Accumulated Other Comprehensive Loss [Member] |
Noncontrolling Interests [Member] |
Redeemable Noncontrolling Interests [Member] |
Redeemable Noncontrolling Interests [Member]
Educational Partners International
|
|---|---|---|---|---|---|---|---|---|---|---|
| Balance at Dec. 31, 2024 | $ 16,928,939 | $ 16,915,898 | $ 591,891 | $ 3,560,633 | $ 13,380,456 | $ (617,082) | $ 13,041 | |||
| Balance, redeemable noncontrolling interests at Dec. 31, 2024 | $ 540,034 | |||||||||
| Net Income | $ 129,347 | 124,906 | 121,714 | 121,714 | 0 | 3,192 | 4,441 | |||
| Other comprehensive income (loss) | 225,929 | 225,956 | 225,956 | 0 | 225,956 | 0 | (27) | |||
| Comprehensive Income | 355,276 | 350,862 | 347,670 | 3,192 | 4,414 | |||||
| Repurchase of common stock | (170,270) | (170,270) | 0 | 0 | (170,270) | 0 | 0 | 0 | ||
| Equity awards expensed | 22,307 | 22,307 | 0 | 22,307 | 0 | 0 | 0 | 0 | ||
| Acquisition of EPI | 0 | 0 | 0 | 0 | 0 | 0 | 0 | $ 81,201 | ||
| Adjustment of redeemable noncontrolling interests | 33,341 | 33,341 | 0 | 0 | 33,341 | 0 | 0 | (33,341) | ||
| Other | (437) | (439) | 0 | (8) | (431) | 0 | 2 | (12,569) | ||
| Balance at Mar. 31, 2025 | 17,164,742 | 17,148,507 | $ 591,891 | 3,582,932 | 13,364,810 | (391,126) | 16,235 | |||
| Balance, redeemable noncontrolling interests at Mar. 31, 2025 | 579,739 | |||||||||
| Balance at Dec. 31, 2025 | 18,596,125 | 18,596,125 | 18,597,756 | 3,672,381 | 15,034,835 | (109,460) | (1,631) | |||
| Balance, redeemable noncontrolling interests at Dec. 31, 2025 | 506,064 | 506,064 | ||||||||
| Net Income | (204,356) | (212,289) | (212,289) | (212,289) | 0 | 0 | 7,933 | |||
| Other comprehensive income (loss) | (128,104) | (128,141) | (128,141) | 0 | (128,141) | 0 | 37 | |||
| Comprehensive Income | (332,460) | (340,430) | (340,430) | 0 | 7,970 | |||||
| Repurchase of common stock | (133,931) | (133,931) | 0 | (133,931) | 0 | 0 | 0 | |||
| Equity awards expensed | 36,943 | 36,943 | 36,943 | 0 | 0 | 0 | 0 | |||
| Adjustment of redeemable noncontrolling interests | (26,437) | (26,437) | 0 | (26,437) | 0 | 0 | 26,437 | |||
| Purchase of noncontrolling interests | 0 | 0 | 0 | 0 | 0 | 0 | (9,495) | |||
| Other | (1,922) | (1,919) | (2,145) | 226 | 0 | (3) | (11,224) | |||
| Balance at Mar. 31, 2026 | 18,130,348 | $ 18,130,348 | $ 18,131,982 | $ 3,707,179 | $ 14,662,404 | $ (237,601) | $ (1,634) | |||
| Balance, redeemable noncontrolling interests at Mar. 31, 2026 | $ 519,752 | $ 519,752 |
Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| OPERATING ACTIVITIES | ||
| Net income (loss) | $ (204,356) | $ 129,347 |
| Adjustments to reconcile net income (loss) to net cash provided by operating activities | 220,268 | 246,845 |
| Net Cash Provided By Operating Activities | 15,912 | 376,192 |
| INVESTING ACTIVITIES | ||
| Proceeds from sales, maturities, calls, and prepayments of fixed maturity securities | 547,820 | 500,466 |
| Cost of fixed maturity securities purchased | (819,452) | (742,665) |
| Proceeds from sales of equity securities | 52,107 | 31,795 |
| Cost of equity securities purchased | (80,072) | (88,531) |
| Net change in short-term investments | 19,595 | 447,436 |
| Additions to property and equipment | (47,265) | (40,713) |
| Acquisitions, net of cash acquired | (20,160) | 0 |
| Other | (791) | 85,017 |
| Net Cash Provided (Used) By Investing Activities | (348,218) | 192,805 |
| FINANCING ACTIVITIES | ||
| Additions to senior long-term debt and other debt | 295,472 | 263,456 |
| Repayment of senior long-term debt and other debt | (217,063) | (202,809) |
| Repurchases of common stock | (133,931) | (170,270) |
| Other | (24,027) | 3,828 |
| Net Cash Used By Financing Activities | (79,549) | (105,795) |
| Effect of foreign currency rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents | (10,169) | 19,492 |
| Increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents | (422,024) | 482,694 |
| Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period | 4,603,302 | 4,192,248 |
| CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD | $ 4,181,278 | $ 4,674,942 |
Summary Of Significant Accounting Policies |
3 Months Ended |
|---|---|
Mar. 31, 2026 | |
| Accounting Policies [Abstract] | |
| Summary Of Significant Accounting Policies | Summary of Significant Accounting Policies Markel Group Inc. (Markel Group) is a holding company comprised of a diverse group of businesses and investments with specialty insurance at its core. See note 2 for details regarding reportable segments. a) Basis of Presentation. The consolidated balance sheet as of March 31, 2026 and the related consolidated statements of income (loss) and comprehensive income (loss) and changes in equity for the three months ended March 31, 2026 and 2025 and the condensed consolidated statements of cash flows for the three months ended March 31, 2026 and 2025 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2025 was derived from Markel Group's audited annual consolidated financial statements. The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group and its consolidated subsidiaries, as well as variable interest entities that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its non-insurance operating businesses on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. Certain prior period amounts have been reclassified to conform to the current period presentation. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements. The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. For a more complete description of the Company's business and accounting policies, readers are urged to review the Company's 2025 Annual Report on Form 10‑K. b) Recent Accounting Pronouncements In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures. The standard requires disclosure of certain prescribed costs and expenses within the notes to consolidated financial statements. ASU No. 2024-03 becomes effective for the Company's 2027 Annual Report on Form 10-K. The standard only impacts required disclosures and will not impact the Company's financial position, results of operations, or cash flows. The Company is currently in the early stages of evaluating the impact of ASU No. 2024-03 on its disclosures.
|
Segment Reporting Disclosures |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Disclosures | Segment Reporting Disclosures The Company has four reportable segments: Markel Insurance, Industrial, Financial, and Consumer and Other. The Markel Insurance segment is the Company's core specialty insurance business, which is comprised of underwriting and other insurance-related activities. The Markel Insurance segment aligns with the business's network of insurance subsidiaries under the common leadership of the Markel Insurance chief executive officer. In August 2025, Markel Insurance sold the renewal rights for business written in its Global Reinsurance division, and the division entered into run-off. The Global Reinsurance division's gross premium volume in 2025 was $1.0 billion. As many of the contracts previously written within this division are multi-year agreements, the Company expects premiums to continue earning over the next two years and loss reserves are expected to take several additional years to run off. The Industrial segment consists of businesses that operate in the industrial sector. These businesses distribute building products, provide fire protection and life safety solutions, and manufacture a variety of products, including precast concrete, car hauler equipment, industrial baking equipment, flooring for dry van trailers, dredges, and wall systems. Other businesses in the Industrial segment provide equipment rental services and erosion control and stormwater management services. The Financial segment consists of businesses that operate in the insurance services and investment management industries, as well as certain insurance-linked securities investment management businesses that are in run-off. The Consumer and Other segment consists of businesses that operate in the consumer sector, as well as a variety of other sectors, including information technology, real estate, and healthcare. These businesses produce ornamental houseplants, build homes, design leather handbags, and own and operate manufactured housing communities. Other businesses in the Consumer and Other segment provide information technology consulting services, retail intelligence, concierge primary healthcare, and sponsorship of international teachers. The Company's corporate operations, which are not an operating or reportable segment, are comprised of holding company activities, which include capital allocation, leadership support, and performing the responsibilities consistent with sound governance and required of a public company. The Company's corporate operations include activities at Markel Group Inc. and investments and loans to and from its operating businesses, which are held by other corporate subsidiaries. Historically, corporate expenses were fully allocated to the Company's segment results, however, beginning in the third quarter of 2025, the Company discontinued allocating corporate expenses that are not integral to operating its underlying businesses. Intersegment transactions primarily consist of loans from Markel Insurance to a corporate subsidiary to fund certain non-insurance acquisitions and from a corporate subsidiary to certain non-insurance businesses to fund strategic growth investments and projects. The Company's chief operating decision maker considers these loans, and the related interest income, to be similar to invested assets held by the respective segment. Interest income on these intercompany loans is included in the respective segment's profit and is eliminated in consolidation. Segment profit for all of the Company's segments is measured by adjusted operating income, which does not include net investment gains, amortization of acquired intangible assets, or impairment of goodwill. Net investment gains and losses, which are primarily comprised of unrealized gains and losses on equity securities, are evaluated separately by the chief operating decision maker when assessing periodic segment financial performance due to the inherent volatility of these gains and losses, which can temporarily obscure the underlying segment performance. The chief operating decision maker believes such amounts are more meaningful when evaluated over longer periods of time. Amortization of acquired intangible assets and impairment of goodwill, which arise from purchase accounting for acquisitions, are not considered a cost of operating the underlying businesses. a) The following tables summarize the Company's segment disclosures. The Company's chief operating decision maker reviews net investment gains and losses by segment separately from the Company's segment profit.
(1) Catastrophe current accident year losses and loss adjustment expenses were attributable to the Middle East conflict.
b) The chief operating decision maker also reviews capital expenditures attributable to the Industrial and Consumer and Other segments.
c) The following table reconciles segment assets to the Company's consolidated balance sheets.
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Investments |
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| Investments, Debt and Equity Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investments | Investments a) The following tables summarize the Company's available-for-sale investments. Agency mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies. The net unrealized holding gains (losses) in the tables below are presented before taxes.
b) The following tables summarize gross unrealized investment losses on available-for-sale investments by the length of time that securities have continuously been in an unrealized loss position.
At March 31, 2026, the Company held 1,102 available-for-sale securities in an unrealized loss position with a total estimated fair value of $10.8 billion and gross unrealized losses of $404.0 million. Of these 1,102 securities, 808 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $6.4 billion and gross unrealized losses of $367.7 million.
At December 31, 2025, the Company held 948 available-for-sale securities in an unrealized loss position with a total estimated fair value of $7.8 billion and gross unrealized losses of $331.4 million. Of these 948 securities, 851 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $6.8 billion and gross unrealized losses of $327.4 million. The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is the result of a credit loss. All available-for-sale securities with unrealized losses are reviewed. The Company considers many factors in completing its quarterly review of securities with unrealized losses for credit-related impairment to determine whether a credit loss exists, including the extent to which fair value is below cost, the implied yield to maturity, rating downgrades of the security, and whether or not the issuer has failed to make scheduled principal or interest payments. The Company also takes into consideration information about the financial condition of the issuer and industry factors that could negatively impact the issuer. If the decline in fair value of an available-for-sale security below its amortized cost is considered to be the result of a credit loss, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit loss, which is recorded as an allowance and recognized in net income. The allowance is limited to the difference between the fair value and the amortized cost of the security. Any remaining decline in fair value represents the non-credit portion of the impairment, which is recognized in other comprehensive income. The Company did not have an allowance for credit losses for any available-for-sale securities as of March 31, 2026 or December 31, 2025. As of March 31, 2026 and December 31, 2025, gross unrealized losses on available-for-sale securities were the result of declines in the fair value of the investments due to increases in interest rates, which are expected to reverse as the securities mature, and foreign currency movements related to available-for-sale securities denominated in a foreign currency. Quarterly, the Company also considers whether it intends to sell an available-for-sale security or if it is more likely than not that it will be required to sell a security before recovery of its amortized cost. In these instances, a decline in fair value is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. c) The amortized cost and estimated fair value of fixed maturity securities at March 31, 2026 are shown below by contractual maturity.
d) The following table presents the components of net investment income.
e) The following table presents the components of net investment losses included in net income (loss) and the change in net unrealized losses included in other comprehensive income (loss). Gross realized investment gains and losses on fixed maturity securities, short-term investments, and other investments were not material to the consolidated financial statements and are presented on a net basis in the following table.
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Fair Value Measurements |
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Measurements | Fair Value Measurements FASB Accounting Standards Codification (ASC) 820, Fair Value Measurements and Disclosures, establishes a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets or liabilities fall within different levels of the hierarchy, the classification is based on the lowest level input that is significant to the fair value measurement of the asset or liability. Classification of assets and liabilities within the hierarchy considers the markets in which the assets and liabilities are traded and the reliability and transparency of the assumptions used to determine fair value. The hierarchy requires the use of observable market data when available. The levels of the hierarchy are defined as follows: •Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets. •Level 2 – Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and market-corroborated inputs. •Level 3 – Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement. In accordance with ASC 820, the Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various methods, including the market, income, and cost approaches. The Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The following section describes the valuation methodologies used by the Company to measure assets and liabilities at fair value, including an indication of the level within the fair value hierarchy in which each asset or liability is generally classified. Available-for-sale investments and equity securities. Available-for-sale investments and equity securities are recorded at fair value on a recurring basis. Available-for-sale investments include fixed maturity securities and short-term investments. Fair value is determined by the Company after considering various sources of information, including information provided by a third-party pricing service. The pricing service provides prices for substantially all of the Company's fixed maturity securities and equity securities. In determining fair value, the Company generally does not adjust the prices obtained from the pricing service. The Company obtains an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows, and prepayment speeds. The Company validates prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances. The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Level 1 investments include those traded on an active exchange, such as the New York Stock Exchange. Level 2 investments include U.S. Treasury securities, U.S. government-sponsored enterprises, municipal bonds, foreign government, agency, and supranational bonds, mortgage-backed securities, and corporate and university debt securities. Fair value for available-for-sale investments and equity securities is measured based upon quoted prices in active markets, if available. Due to variations in trading volumes and the lack of quoted market prices, fixed maturity securities are classified as Level 2 investments. The fair value of fixed maturity securities is normally derived through recent reported trades for identical or similar securities, making adjustments through the reporting date based upon available market observable data previously described. If there are no recent reported trades, the fair value of fixed maturity securities may be derived through the use of matrix pricing or model processes, where future cash flow expectations are developed based upon collateral performance and discounted at an estimated market rate. Significant inputs used to determine the fair value of obligations of states, municipalities and political subdivisions, corporate and university bonds, and obligations of foreign governments, agencies and supranationals include reported trades, benchmark yields, issuer spreads, bids, offers, credit information, and estimated cash flows. Significant inputs used to determine the fair value of mortgage-backed securities include the type of underlying assets, benchmark yields, prepayment speeds, collateral information, tranche type and volatility, estimated cash flows, credit information, default rates, recovery rates, issuer spreads, and the year of issue. Senior long-term debt and other debt. Senior long-term debt and other debt is carried at amortized cost with the estimated fair value disclosed on the consolidated balance sheets. Senior long-term debt and other debt is classified as Level 2 within the fair value hierarchy due to variations in trading volumes and the lack of quoted market prices. Fair value is generally derived through recent reported trades, making adjustments through the reporting date, if necessary, based upon available market observable data including U.S. Treasury securities and implied credit spreads. Significant inputs used to determine the fair value of senior long-term debt and other debt include reported trades, benchmark yields, issuer spreads, bids, and offers. The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.
The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the three months ended March 31, 2026 and 2025.
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Products, Services and Other Revenues |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Products, Services and Other Revenues | Products, Services, and Other Revenues The following tables present revenues from contracts with customers by type, all of which are included in products revenues and services and other revenues in the consolidated statements of income (loss) and comprehensive income (loss), along with a reconciliation to the total of products revenues and services and other revenues.
Receivables from contracts with customers, net of allowances for credit losses, were $642.7 million and $692.4 million as of March 31, 2026 and December 31, 2025, respectively.
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Unpaid Losses And Loss Adjustment Expenses |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unpaid Losses And Loss Adjustment Expenses | Unpaid Losses and Loss Adjustment Expenses The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.
For the three months ended March 31, 2026, current accident year losses and loss adjustment expenses included $35.0 million of net losses and loss adjustment expenses attributed to the regional military conflict that emerged in the Middle East following U.S. and Israeli airstrikes on Iran on February 28, 2026. Net losses and loss adjustment expenses from the Middle East conflict were attributed to terrorism and marine war coverages written by the International division within the Markel Insurance segment. Loss estimates for incurred losses attributed to the Middle East conflict represent the Company's best estimate as of March 31, 2026 based upon information currently available. The Company's estimates for these losses are based on known losses and reported claims, as well as an analysis of the Company's ceded reinsurance contracts. Due to the inherent uncertainty associated with the assumptions surrounding the Middle East conflict, these estimates are subject to a wide range of variability. While the Company believes the reserves for losses and loss adjustment expenses for the Middle East conflict as of March 31, 2026 are adequate based on information currently available, the Company continues to closely monitor reported claims, ceded reinsurance contract attachment, government actions, and areas impacted by the conflict and may adjust its loss estimates as new information becomes available. Additionally, as the Middle East conflict is ongoing, additional losses may be incurred in subsequent periods, and such losses may be material to the Company's results of operations, financial condition, and cash flows. Effective January 1, 2026, the Company entered into a retroactive reinsurance agreement with Hagerty Reinsurance Limited (Hagerty Re) to reinsure its retained exposures on business written on behalf of Hagerty, Inc. (Hagerty) prior to January 1, 2026. Net losses and loss adjustment expenses on these ceded policies totaled $62.2 million as of December 31, 2025, for which the Company paid $54.1 million to Hagerty Re. See note 8 for additional details on the Company's transactions with Hagerty to transition the relationship to a fronting arrangement. For the three months ended March 31, 2026, losses and loss adjustment expenses included $104.1 million of favorable development on prior years loss reserves, which included $64.4 million of net favorable development on the Company's professional liability, credit and surety, and workers' compensation insurance product lines within its Markel Insurance segment. For the three months ended March 31, 2025, current accident year losses and loss adjustment expenses included $66.1 million of net losses and loss adjustment expenses attributed to the series of wildfires that occurred in southern California in January 2025. For the three months ended March 31, 2025, losses and loss adjustment expenses included $150.1 million of favorable development on prior years loss reserves, which included $125.2 million of net favorable development on the Company's professional liability, general liability, marine and energy, and workers' compensation insurance product lines within its Markel Insurance segment.
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Reinsurance |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Reinsurance Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reinsurance | Reinsurance The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned. Fronting premiums are attributable to business written on behalf of third-party capacity providers, substantially all of which are ceded.
Substantially all of the incurred losses and loss adjustment expenses related to the Company's fronted premiums were ceded. These gross losses totaled $1.2 billion and $957.5 million for the three months ended March 31, 2026 and 2025, respectively. The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.
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Related Party Transactions |
3 Months Ended |
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Mar. 31, 2026 | |
| Related Party Transactions [Abstract] | |
| Related Party Transactions Disclosure [Text Block] | Related Party Transactions The Company engages in certain related party transactions in the normal course of business at arm's length. Nephila Fund Management The Company provides investment and insurance management services through Nephila Holdings Ltd. (together with its subsidiaries, Nephila). Nephila serves as the investment manager to several Bermuda based private funds (the Nephila Funds). To provide access for the Nephila Funds to a variety of insurance-linked securities in the property catastrophe, climate, and specialty insurance markets, Nephila also acts as an insurance manager to certain Bermuda licensed reinsurers and as the managing agent to Lloyd's Syndicates 2357, 2358, and 2359 (collectively, the Nephila Reinsurers). Neither the Nephila Funds nor the Nephila Reinsurers are consolidated by the Company. Nephila receives management fees for investment and insurance management services based on either the net asset value of the accounts managed or gross premium volume for the underlying risks to which the investors subscribed. For certain funds, Nephila may also receive performance fees based on their annual performance. For the three months ended March 31, 2026 and 2025, total fund management revenues attributed to unconsolidated entities managed by Nephila were $40.5 million and $25.5 million, respectively. Fronting The Company's fronting activities, which are provided through the Company's Markel Insurance operations and program services operations, include programs with the Nephila Reinsurers through which the Company writes insurance policies that are fully ceded to the Nephila Reinsurers in exchange for fronting fees. Through these programs, Nephila utilizes certain of the Company's licensed insurance companies to write a portion of its portfolio of U.S. catastrophe-exposed property and specialty risks. Gross premiums written through these programs that were ceded to the Nephila Reinsurers were $267.4 million and $389.3 million for the three months ended March 31, 2026 and 2025, respectively. As of March 31, 2026 and December 31, 2025, reinsurance recoverables on the consolidated balance sheets included $267.6 million and $496.0 million, respectively, due from the Nephila Reinsurers. Under its programs with the Nephila Reinsurers, the Company bears underwriting risk for annual aggregate agreement year losses in excess of a limit the Company believes is unlikely to be exceeded. To the extent losses under these programs exceed the prescribed limits, the Company is obligated to pay such losses to the cedents without recourse to the Nephila Reinsurers. While the Company believes losses under these programs are unlikely, those losses, if incurred, could be material to the Company's consolidated results of operations and financial condition. The Company has also entered into other assumed and ceded reinsurance transactions with the Nephila Reinsurers in the normal course of business, which are not material to the Company's consolidated financial statements. Hagerty The Company holds a minority ownership interest in Hagerty, which operates as a managing general agent focused on the global automobile enthusiast market and also includes Hagerty Re, a Bermuda Class 3 reinsurance company. The Company writes U.S. classic car business on behalf of Hagerty. Effective January 1, 2026, the Company's business with Hagerty transitioned to a fronting arrangement, whereby the Company receives a fronting fee in exchange for writing business on behalf of Hagerty and ceding it to Hagerty Re. Prior to transitioning to a fronting arrangement, the majority of the Company's business with Hagerty was ceded to Hagerty Re. Gross written premiums attributable to Hagerty for the three months ended March 31, 2026 were $253.3 million, all of which were ceded, including $242.1 million ceded to Hagerty Re. For the three months ended March 31, 2025, gross written premiums attributable to Hagerty were $219.9 million, of which $169.7 million were ceded to Hagerty Re. In connection with the transition, the Company also entered into agreements with Hagerty Re to reinsure its retained exposures on business written on behalf of Hagerty prior to January 1, 2026. Net losses and loss adjustment expenses and unearned premiums on these ceded policies totaled $62.2 million and $92.5 million, respectively, as of December 31, 2025. See note 6 for additional details on the Company's retroactive reinsurance agreement with Hagerty. As of March 31, 2026 and December 31, 2025, reinsurance recoverables on the consolidated balance sheets included $298.0 million and $317.1 million, respectively, due from Hagerty Re.
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Shareholders' Equity |
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| Stockholders' Equity Note [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholders' Equity | Shareholders' Equity a) The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.
b) The Company has 10,000,000 shares of no par value preferred stock authorized, none of which were issued or outstanding at March 31, 2026 and December 31, 2025. c) Net income (loss) per common share was determined by dividing adjusted net income (loss) to shareholders by the applicable weighted average common shares outstanding. Weighted average basic common shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which corresponding shares have not been issued. Diluted net income (loss) per common share is computed by dividing adjusted net income (loss) to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. The following table presents basic net income (loss) per common share and diluted net income (loss) per common share.
(1) The impact of 39 thousand shares from restricted stock units and restricted stock awards was excluded from the computation of diluted earnings per common share for the three months ended March 31, 2026 because the effect would have been anti-dilutive.
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Contingencies |
3 Months Ended |
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Mar. 31, 2026 | |
| Loss Contingency [Abstract] | |
| Contingencies | Contingencies Contingencies arise in the normal course of the Company's operations and are not expected to have a material impact on the Company's financial condition or results of operations.
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Insider Trading Arrangements |
3 Months Ended |
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Mar. 31, 2026 | |
| Trading Arrangements, by Individual | |
| Rule 10b5-1 Arrangement Adopted | false |
| Non-Rule 10b5-1 Arrangement Adopted | false |
| Rule 10b5-1 Arrangement Terminated | false |
| Non-Rule 10b5-1 Arrangement Terminated | false |
Summary Of Significant Accounting Policies (Policies) |
3 Months Ended |
|---|---|
Mar. 31, 2026 | |
| Accounting Policies [Abstract] | |
| Basis of Presentation | Basis of Presentation. The consolidated balance sheet as of March 31, 2026 and the related consolidated statements of income (loss) and comprehensive income (loss) and changes in equity for the three months ended March 31, 2026 and 2025 and the condensed consolidated statements of cash flows for the three months ended March 31, 2026 and 2025 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2025 was derived from Markel Group's audited annual consolidated financial statements. The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group and its consolidated subsidiaries, as well as variable interest entities that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its non-insurance operating businesses on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. Certain prior period amounts have been reclassified to conform to the current period presentation. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements. The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. For a more complete description of the Company's business and accounting policies, readers are urged to review the Company's 2025 Annual Report on Form 10‑K.
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| Recent Accounting Pronouncements | Recent Accounting Pronouncements In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures. The standard requires disclosure of certain prescribed costs and expenses within the notes to consolidated financial statements. ASU No. 2024-03 becomes effective for the Company's 2027 Annual Report on Form 10-K. The standard only impacts required disclosures and will not impact the Company's financial position, results of operations, or cash flows. The Company is currently in the early stages of evaluating the impact of ASU No. 2024-03 on its disclosures.
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Segment Reporting Disclosures (Tables) |
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| Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Company's Segment Disclosures | The following tables summarize the Company's segment disclosures. The Company's chief operating decision maker reviews net investment gains and losses by segment separately from the Company's segment profit.
(1) Catastrophe current accident year losses and loss adjustment expenses were attributable to the Middle East conflict.
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| Capital expenditures attributable to the Industrial & Consumer and Other segments | b) The chief operating decision maker also reviews capital expenditures attributable to the Industrial and Consumer and Other segments.
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| Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets | The following table reconciles segment assets to the Company's consolidated balance sheets.
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Investments (Tables) |
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| Investments, Debt and Equity Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Available-For-Sale Investments | The following tables summarize the Company's available-for-sale investments. Agency mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies. The net unrealized holding gains (losses) in the tables below are presented before taxes.
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| Unrealized Gain (Loss) on Investments | The following tables summarize gross unrealized investment losses on available-for-sale investments by the length of time that securities have continuously been in an unrealized loss position.
At March 31, 2026, the Company held 1,102 available-for-sale securities in an unrealized loss position with a total estimated fair value of $10.8 billion and gross unrealized losses of $404.0 million. Of these 1,102 securities, 808 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $6.4 billion and gross unrealized losses of $367.7 million.
At December 31, 2025, the Company held 948 available-for-sale securities in an unrealized loss position with a total estimated fair value of $7.8 billion and gross unrealized losses of $331.4 million. Of these 948 securities, 851 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $6.8 billion and gross unrealized losses of $327.4 million.
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| Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date | The amortized cost and estimated fair value of fixed maturity securities at March 31, 2026 are shown below by contractual maturity.
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| Components Of Net Investment Income | The following table presents the components of net investment income.
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| Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Available-For-Sale Investments | The following table presents the components of net investment losses included in net income (loss) and the change in net unrealized losses included in other comprehensive income (loss). Gross realized investment gains and losses on fixed maturity securities, short-term investments, and other investments were not material to the consolidated financial statements and are presented on a net basis in the following table.
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Fair Value Measurements (Tables) |
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Balances Of Assets Measured At Fair Value On A Recurring Basis | The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.
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Products, Services and Other Revenues (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Revenues From Contracts With Customers By Type | The following tables present revenues from contracts with customers by type, all of which are included in products revenues and services and other revenues in the consolidated statements of income (loss) and comprehensive income (loss), along with a reconciliation to the total of products revenues and services and other revenues.
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Unpaid Losses And Loss Adjustment Expenses (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses | The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.
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Reinsurance (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reinsurance Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned | The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned. Fronting premiums are attributable to business written on behalf of third-party capacity providers, substantially all of which are ceded.
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| Percentage of reinsurance ceded earned premiums to GEP & assumed earned premiums to NEP |
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| Effect Of Reinsurance And Retrocessional Reinsurance On Losses and Loss Adjustment Expenses | The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.
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Shareholders' Equity (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stockholders' Equity Note [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Common Stock Outstanding Roll Forward | The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.
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| Schedule Of Net Income (Loss) Per Common Share | The following table presents basic net income (loss) per common share and diluted net income (loss) per common share.
(1) The impact of 39 thousand shares from restricted stock units and restricted stock awards was excluded from the computation of diluted earnings per common share for the three months ended March 31, 2026 because the effect would have been anti-dilutive.
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Segment Reporting Disclosures (Narrative) (Details) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2026
segment
|
Dec. 31, 2025
USD ($)
|
|
| Segment Reporting Information [Line Items] | ||
| Number of Reportable Segments | segment | 4 | |
| Global Reinsurance Division [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Gross premium volume | $ | $ 1,000,000 |
Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | $ 2,048,886 | $ 2,089,374 | |||
| Net investment income | 255,890 | 237,095 | |||
| Products revenues | 572,421 | 561,124 | |||
| Services and other revenues | 673,408 | 660,583 | |||
| Operating revenues | 3,550,605 | 3,548,176 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | (1,235,852) | (1,338,708) | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | (35,028) | [1] | (66,064) | ||
| Losses and loss adjustment expenses, prior accident year | 104,063 | 150,107 | |||
| Amortization of policy acquisition costs | (412,930) | (417,022) | |||
| Other underwriting expenses | (326,898) | (330,416) | |||
| Products expenses | (517,430) | (499,908) | |||
| Services and other expenses | (628,784) | (567,628) | |||
| Adjusted operating income (loss) | 497,746 | 478,537 | |||
| Net investment gains (losses) | (727,562) | (149,071) | |||
| Amortization of acquired intangible assets | (43,513) | (46,942) | |||
| Interest expense | (50,886) | (52,140) | |||
| Net foreign exchange gains (losses) | 54,277 | (72,633) | |||
| Income (Loss) before income taxes | (269,938) | 157,751 | |||
| Markel Insurance | |||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | 1,969,339 | 2,016,539 | |||
| Net investment income | 229,619 | 207,517 | |||
| Products revenues | 0 | 0 | |||
| Services and other revenues | 2,727 | 2,620 | |||
| Operating revenues | 2,201,685 | 2,226,676 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | (1,185,910) | (1,295,523) | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | (35,028) | [1] | (66,064) | ||
| Losses and loss adjustment expenses, prior accident year | 106,939 | 148,837 | |||
| Amortization of policy acquisition costs | (406,729) | (411,276) | |||
| Other underwriting expenses | (306,362) | (312,351) | |||
| Products expenses | 0 | 0 | |||
| Services and other expenses | (5,105) | (8,184) | |||
| Adjusted operating income (loss) | 369,490 | 282,115 | |||
| Net investment gains (losses) | (553,914) | (224,194) | |||
| Industrial | |||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | 0 | 0 | |||
| Net investment income | 0 | 0 | |||
| Products revenues | 397,725 | 369,245 | |||
| Services and other revenues | 485,333 | 460,329 | |||
| Operating revenues | 883,058 | 829,574 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Losses and loss adjustment expenses, prior accident year | 0 | 0 | |||
| Amortization of policy acquisition costs | 0 | 0 | |||
| Other underwriting expenses | 0 | 0 | |||
| Products expenses | (359,950) | (326,035) | |||
| Services and other expenses | (473,822) | (444,775) | |||
| Adjusted operating income (loss) | 49,286 | 58,764 | |||
| Net investment gains (losses) | 0 | 0 | |||
| Financial | |||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | 79,547 | 72,835 | |||
| Net investment income | 9,130 | 8,952 | |||
| Products revenues | 0 | 0 | |||
| Services and other revenues | 72,853 | 96,694 | |||
| Operating revenues | 161,530 | 178,481 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | (49,942) | (43,185) | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Losses and loss adjustment expenses, prior accident year | (2,876) | 1,270 | |||
| Amortization of policy acquisition costs | (6,201) | (5,746) | |||
| Other underwriting expenses | (20,536) | (18,065) | |||
| Products expenses | 0 | 0 | |||
| Services and other expenses | (45,770) | (33,144) | |||
| Adjusted operating income (loss) | 36,205 | 79,611 | |||
| Net investment gains (losses) | 369 | 0 | |||
| Consumer and Other | |||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | 0 | 0 | |||
| Net investment income | 0 | 0 | |||
| Products revenues | 174,696 | 191,879 | |||
| Services and other revenues | 105,801 | 95,907 | |||
| Operating revenues | 280,497 | 287,786 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Losses and loss adjustment expenses, prior accident year | 0 | 0 | |||
| Amortization of policy acquisition costs | 0 | 0 | |||
| Other underwriting expenses | 0 | 0 | |||
| Products expenses | (157,480) | (173,873) | |||
| Services and other expenses | (83,262) | (81,525) | |||
| Adjusted operating income (loss) | 39,755 | 32,388 | |||
| Net investment gains (losses) | 0 | 0 | |||
| Corporate and eliminations | |||||
| Segment Reporting Information [Line Items] | |||||
| Earned premiums | 0 | 0 | |||
| Net investment income | 17,141 | 20,626 | |||
| Products revenues | 0 | 0 | |||
| Services and other revenues | 6,694 | 5,033 | |||
| Operating revenues | 23,835 | 25,659 | |||
| Attritional Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Catastrophe Current Year Claims and Claims Adjustment Expense | 0 | 0 | |||
| Losses and loss adjustment expenses, prior accident year | 0 | 0 | |||
| Amortization of policy acquisition costs | 0 | 0 | |||
| Other underwriting expenses | 0 | 0 | |||
| Products expenses | 0 | 0 | |||
| Services and other expenses | (20,825) | 0 | |||
| Adjusted operating income (loss) | 3,010 | 25,659 | |||
| Corporate Operations | |||||
| Segment Reporting Information [Line Items] | |||||
| Net investment gains (losses) | $ (174,017) | $ 75,123 | |||
| |||||
Segment Reporting Disclosures (Capital expenditures attributable to the Industrial & Consumer and Other segments) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Industrial | ||
| Segment Reporting Information [Line Items] | ||
| Capital expenditure | $ 22,636 | $ 16,434 |
| Consumer and Other | ||
| Segment Reporting Information [Line Items] | ||
| Capital expenditure | $ 11,268 | $ 11,521 |
Segment Reporting Disclosures (Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Assets | $ 68,602,357 | $ 68,905,050 |
| Corporate and eliminations | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 4,268,430 | 4,397,391 |
| Segment assets [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 64,333,927 | 64,507,659 |
| Segment assets [Member] | Markel Insurance | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 43,473,248 | 44,314,601 |
| Segment assets [Member] | Industrial | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 3,989,709 | 3,965,449 |
| Segment assets [Member] | Financial | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 15,057,582 | 14,444,426 |
| Segment assets [Member] | Consumer and Other | ||
| Segment Reporting Information [Line Items] | ||
| Assets | $ 1,813,388 | $ 1,783,183 |
Investments (Narrative) (Details) $ in Thousands |
Mar. 31, 2026
USD ($)
securities
|
Dec. 31, 2025
USD ($)
securities
|
|---|---|---|
| Investments, Debt and Equity Securities [Abstract] | ||
| Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities | 1,102 | 948 |
| Available-for-sale securities, estimated fair value | $ 10,756,972 | $ 7,763,106 |
| Available-for-sale securities, gross unrealized holding losses | $ (403,995) | $ (331,436) |
| Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities | 808 | 851 |
| Available-for-sale securities, estimated fair value, 12 months or longer | $ 6,410,560 | $ 6,816,461 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (367,703) | (327,375) |
| Investments, available-for-sale, allowance for credit losses | $ 0 | $ 0 |
Investments (Available-For-Sale Investments) (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | $ 18,207,316 | |
| Available-for-sale fixed maturity securities, estimated fair value | 17,943,781 | $ 17,797,986 |
| Investments, available-for-sale, amortized cost | 20,234,398 | 19,925,568 |
| Investments, available-for-sale, gross unrealized holding gains | 139,525 | 237,516 |
| Investments, available-for-sale, gross unrealized holding losses | (403,995) | (331,436) |
| Investments, available-for-sale, estimated fair value | 19,969,928 | 19,831,648 |
| U.S. Treasury securities [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 5,992,327 | 5,877,779 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 33,328 | 63,769 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (23,853) | (13,641) |
| Available-for-sale fixed maturity securities, estimated fair value | 6,001,802 | 5,927,907 |
| U.S. government-sponsored enterprises [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 1,715,840 | 1,678,599 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 13,140 | 19,378 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (64,358) | (57,743) |
| Available-for-sale fixed maturity securities, estimated fair value | 1,664,622 | 1,640,234 |
| Obligations of states, municipalities and political subdivisions [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 3,759,474 | 3,743,154 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 24,502 | 34,871 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (111,523) | (105,557) |
| Available-for-sale fixed maturity securities, estimated fair value | 3,672,453 | 3,672,468 |
| Foreign governments, agencies and supranationals [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 3,484,109 | 3,359,014 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 51,406 | 89,595 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (111,258) | (73,694) |
| Available-for-sale fixed maturity securities, estimated fair value | 3,424,257 | 3,374,915 |
| Agency mortgage-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 2,978,312 | 2,935,758 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 15,434 | 24,903 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (66,982) | (59,541) |
| Available-for-sale fixed maturity securities, estimated fair value | 2,926,764 | 2,901,120 |
| Non-agency mortgage-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 54,756 | 66,296 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 0 | 0 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (701) | (538) |
| Available-for-sale fixed maturity securities, estimated fair value | 54,055 | 65,758 |
| Corporate and university bonds [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 222,498 | 235,318 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 189 | 368 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (22,859) | (20,102) |
| Available-for-sale fixed maturity securities, estimated fair value | 199,828 | 215,584 |
| Total fixed maturity securities [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, available-for-sale, amortized cost | 18,207,316 | 17,895,918 |
| Available-for-sale fixed maturity securities, gross unrealized holding gains | 137,999 | 232,884 |
| Available-for-sale fixed maturity securities, gross unrealized holding losses | (401,534) | (330,816) |
| Available-for-sale fixed maturity securities, estimated fair value | 17,943,781 | 17,797,986 |
| Short-term investments [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Short-term investments, available-for-sale, amortized cost | 2,027,082 | 2,029,650 |
| Short-term investments, available-for-sale, gross unrealized holding gains | 1,526 | 4,632 |
| Short-term investments, available-for-sale, gross unrealized holding losses | (2,461) | (620) |
| Short-term investments, available-for-sale, estimated fair value | $ 2,026,147 | $ 2,033,662 |
Investments (Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position) (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | $ 4,346,412 | $ 946,645 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (36,292) | (4,061) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 6,410,560 | 6,816,461 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (367,703) | (327,375) |
| Available-for-sale securities, estimated fair value | 10,756,972 | 7,763,106 |
| Available-for-sale securities, gross unrealized holding losses | (403,995) | (331,436) |
| U.S. Treasury securities [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 1,109,592 | 197,135 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (5,438) | (470) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 1,165,863 | 1,275,453 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (18,415) | (13,171) |
| Available-for-sale securities, estimated fair value | 2,275,455 | 1,472,588 |
| Available-for-sale securities, gross unrealized holding losses | (23,853) | (13,641) |
| U.S. government-sponsored enterprises [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 181,210 | 108,490 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (1,027) | (112) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 766,475 | 802,349 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (63,331) | (57,631) |
| Available-for-sale securities, estimated fair value | 947,685 | 910,839 |
| Available-for-sale securities, gross unrealized holding losses | (64,358) | (57,743) |
| Obligations of states, municipalities and political subdivisions [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 511,759 | 184,124 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (3,887) | (970) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 1,762,168 | 1,871,154 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (107,636) | (104,587) |
| Available-for-sale securities, estimated fair value | 2,273,927 | 2,055,278 |
| Available-for-sale securities, gross unrealized holding losses | (111,523) | (105,557) |
| Foreign governments, agencies and supranationals [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 798,190 | 214,787 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (17,276) | (1,008) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 1,131,345 | 1,181,298 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (93,982) | (72,686) |
| Available-for-sale securities, estimated fair value | 1,929,535 | 1,396,085 |
| Available-for-sale securities, gross unrealized holding losses | (111,258) | (73,694) |
| Agency mortgage-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 529,219 | 156,553 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (5,626) | (701) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 1,359,971 | 1,446,048 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (61,356) | (58,840) |
| Available-for-sale securities, estimated fair value | 1,889,190 | 1,602,601 |
| Available-for-sale securities, gross unrealized holding losses | (66,982) | (59,541) |
| Non-agency mortgage-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 5,857 | 5,889 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (42) | (6) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 48,198 | 59,869 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (659) | (532) |
| Available-for-sale securities, estimated fair value | 54,055 | 65,758 |
| Available-for-sale securities, gross unrealized holding losses | (701) | (538) |
| Corporate and university bonds [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 21,097 | 20,488 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (535) | (174) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 176,540 | 180,290 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (22,324) | (19,928) |
| Available-for-sale securities, estimated fair value | 197,637 | 200,778 |
| Available-for-sale securities, gross unrealized holding losses | (22,859) | (20,102) |
| Total fixed maturity securities [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Available-for-sale securities, estimated fair value, less than 12 months | 3,156,924 | 887,466 |
| Available-for-sale securities, gross unrealized holding losses, less than 12 months | (33,831) | (3,441) |
| Available-for-sale securities, estimated fair value, 12 months or longer | 6,410,560 | 6,816,461 |
| Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (367,703) | (327,375) |
| Available-for-sale securities, estimated fair value | 9,567,484 | 7,703,927 |
| Available-for-sale securities, gross unrealized holding losses | (401,534) | (330,816) |
| Short-term investments [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Short-term investments, estimated fair value, less than 12 months | 1,189,488 | 59,179 |
| Short-term investments, gross unrealized holding losses, less than 12 months | (2,461) | (620) |
| Short-term investments, estimated fair value, 12 months or longer | 0 | 0 |
| Short-term investments, gross unrealized holding losses, 12 months or longer | 0 | 0 |
| Short-term investments, estimated fair value | 1,189,488 | 59,179 |
| Short-term investments, gross unrealized holding losses | $ (2,461) | $ (620) |
Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Due in one year or less, amortized cost | $ 2,172,638 | |
| Due after one year through five years, amortized cost | 6,579,483 | |
| Due after five years through ten years, amortized cost | 5,237,767 | |
| Due after ten years, amortized cost | 1,184,360 | |
| Amortized cost, sub-total | 15,174,248 | |
| Total fixed maturity securities, amortized cost | 18,207,316 | |
| Due in one year or less, estimated fair value | 2,171,438 | |
| Due after one year through five years, estimated fair value | 6,530,862 | |
| Due after five years through ten years, estimated fair value | 5,169,709 | |
| Due after ten years, estimated fair value | 1,090,953 | |
| Estimated fair value, sub-total | 14,962,962 | |
| Total fixed maturity securities, estimated fair value | 17,943,781 | $ 17,797,986 |
| Mortgage-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Fixed maturity securities, amortized cost | 3,033,068 | |
| Fixed maturity securities, estimated fair value | $ 2,980,819 |
Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Dividends on equity securities | $ 49,336 | $ 40,195 |
| Total investment income | 261,720 | 242,987 |
| Investment expenses | (5,830) | (5,892) |
| Net investment income | 255,890 | 237,095 |
| Fixed Maturity Securities [Member] | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Interest income | 164,324 | 143,345 |
| Short-term investments [Member] | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Interest income | 17,104 | 19,673 |
| Cash and Cash Equivalents | ||
| Schedule of Investment Income, Reported Amounts, by Category [Line Items] | ||
| Interest income | $ 30,956 | $ 39,774 |
Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Gain (Loss) on Securities [Line Items] | ||
| Net realized investment gains (losses) | $ 2,043 | $ (1,801) |
| Change in fair value of securities sold during the period | (1,620) | (1,322) |
| Change in fair value of securities held at the end of the period | (727,985) | (145,948) |
| Total change in fair value of equity securities | (729,605) | (147,270) |
| Net investment gains (losses) | (727,562) | (149,071) |
| Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): | (170,551) | 277,227 |
| Fixed Maturity Securities [Member] | ||
| Gain (Loss) on Securities [Line Items] | ||
| Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): | (165,604) | 273,213 |
| Short-term investments [Member] | ||
| Gain (Loss) on Securities [Line Items] | ||
| Change in net unrealized losses on available-for-sale investments included in other comprehensive income (loss): | $ (4,947) | $ 4,014 |
Fair Value Measurements (Narrative) (Details) - Fair value, nonrecurring [Member] - USD ($) $ in Thousands |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Assets measured at fair value on a nonrecurring basis | $ 0 | $ 0 |
| Liabilities measured at fair value on a nonrecurring basis | $ 0 | $ 0 |
Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | $ 17,943,781 | $ 17,797,986 |
| Equity securities | 12,302,672 | 13,004,312 |
| Short-term investments, available-for-sale | 2,026,147 | 2,033,662 |
| Total Investments | 32,272,600 | 32,835,960 |
| Fixed Maturity Securities [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 17,943,781 | 17,797,986 |
| U.S. Treasury securities [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 6,001,802 | 5,927,907 |
| U.S. government-sponsored enterprises [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 1,664,622 | 1,640,234 |
| Obligations of states, municipalities and political subdivisions [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,672,453 | 3,672,468 |
| Foreign governments, agencies and supranationals [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,424,257 | 3,374,915 |
| Agency mortgage-backed securities | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 2,926,764 | 2,901,120 |
| Non-agency mortgage-backed securities | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 54,055 | 65,758 |
| Corporate and university bonds [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 199,828 | 215,584 |
| Fair value, recurring [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 17,943,781 | 17,797,986 |
| Equity securities | 12,302,672 | 13,004,312 |
| Short-term investments, available-for-sale | 2,026,147 | 2,033,662 |
| Total Investments | 32,272,600 | 32,835,960 |
| Fair value, recurring [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Equity securities | 12,302,672 | 13,004,312 |
| Short-term investments, available-for-sale | 1,824,361 | 1,843,163 |
| Total Investments | 14,127,033 | 14,847,475 |
| Fair value, recurring [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 17,943,781 | 17,797,986 |
| Equity securities | 0 | 0 |
| Short-term investments, available-for-sale | 201,786 | 190,499 |
| Total Investments | 18,145,567 | 17,988,485 |
| Fair value, recurring [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Equity securities | 0 | 0 |
| Short-term investments, available-for-sale | 0 | 0 |
| Total Investments | 0 | 0 |
| Fair value, recurring [Member] | U.S. Treasury securities [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 6,001,802 | 5,927,907 |
| Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 6,001,802 | 5,927,907 |
| Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 1,664,622 | 1,640,234 |
| Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 1,664,622 | 1,640,234 |
| Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,672,453 | 3,672,468 |
| Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,672,453 | 3,672,468 |
| Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,424,257 | 3,374,915 |
| Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 3,424,257 | 3,374,915 |
| Fair value, recurring [Member] | Foreign governments, agencies and supranationals [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Agency mortgage-backed securities | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 2,926,764 | 2,901,120 |
| Fair value, recurring [Member] | Agency mortgage-backed securities | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Agency mortgage-backed securities | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 2,926,764 | 2,901,120 |
| Fair value, recurring [Member] | Agency mortgage-backed securities | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Non-agency mortgage-backed securities | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 54,055 | 65,758 |
| Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 54,055 | 65,758 |
| Fair value, recurring [Member] | Non-agency mortgage-backed securities | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Corporate and university bonds [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 199,828 | 215,584 |
| Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 199,828 | 215,584 |
| Fair value, recurring [Member] | Corporate and university bonds [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale fixed maturity securities, estimated fair value | 0 | 0 |
| Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 4,884,952 | 5,441,617 |
| Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 4,884,952 | 5,441,617 |
| Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 0 | 0 |
| Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 0 | 0 |
| Fair value, recurring [Member] | Industrial, consumer and all other [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 7,417,720 | 7,562,695 |
| Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 7,417,720 | 7,562,695 |
| Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | 0 | 0 |
| Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Equity securities | $ 0 | $ 0 |
Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | $ 52,606 | $ 53,648 |
| Fronting fees | 48,621 | 39,654 |
| Equity method and other investments income (loss) | (7,716) | 36,400 |
| Other revenues (losses) | 301 | 1,270 |
| Products Revenues and Services and Other Revenues | 1,245,829 | 1,221,707 |
| Markel Insurance | ||
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | 0 | 0 |
| Fronting fees | 5,451 | 3,144 |
| Equity method and other investments income (loss) | (2,279) | (2,516) |
| Other revenues (losses) | (1,987) | 47 |
| Products Revenues and Services and Other Revenues | 2,727 | 2,620 |
| Industrial | ||
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | 35,020 | 36,990 |
| Fronting fees | 0 | 0 |
| Equity method and other investments income (loss) | 0 | 46 |
| Other revenues (losses) | 1,285 | 287 |
| Products Revenues and Services and Other Revenues | 883,058 | 829,574 |
| Financial | ||
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | 0 | 0 |
| Fronting fees | 43,170 | 36,510 |
| Equity method and other investments income (loss) | (12,131) | 33,837 |
| Other revenues (losses) | 0 | 9 |
| Products Revenues and Services and Other Revenues | 72,853 | 96,694 |
| Consumer and Other | ||
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | 17,586 | 16,658 |
| Fronting fees | 0 | 0 |
| Equity method and other investments income (loss) | 0 | 0 |
| Other revenues (losses) | 1,003 | 927 |
| Products Revenues and Services and Other Revenues | 280,497 | 287,786 |
| Corporate Operations | ||
| Disaggregation of Revenue [Line Items] | ||
| Leasing revenues | 0 | 0 |
| Fronting fees | 0 | 0 |
| Equity method and other investments income (loss) | 6,694 | 5,033 |
| Other revenues (losses) | 0 | 0 |
| Products Revenues and Services and Other Revenues | 6,694 | 5,033 |
| Revenue from contracts with customers [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 1,152,017 | 1,090,735 |
| Revenue from contracts with customers [Member] | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 564,038 | 554,117 |
| Revenue from contracts with customers [Member] | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 546,425 | 510,750 |
| Revenue from contracts with customers [Member] | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 41,554 | 25,868 |
| Revenue from contracts with customers [Member] | Markel Insurance | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 1,542 | 1,945 |
| Revenue from contracts with customers [Member] | Markel Insurance | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Markel Insurance | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 1,542 | 1,945 |
| Revenue from contracts with customers [Member] | Markel Insurance | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Industrial | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 846,753 | 792,251 |
| Revenue from contracts with customers [Member] | Industrial | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 389,488 | 362,357 |
| Revenue from contracts with customers [Member] | Industrial | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 457,265 | 429,894 |
| Revenue from contracts with customers [Member] | Industrial | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Financial | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 41,814 | 26,338 |
| Revenue from contracts with customers [Member] | Financial | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Financial | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 260 | 470 |
| Revenue from contracts with customers [Member] | Financial | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 41,554 | 25,868 |
| Revenue from contracts with customers [Member] | Consumer and Other | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 261,908 | 270,201 |
| Revenue from contracts with customers [Member] | Consumer and Other | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 174,550 | 191,760 |
| Revenue from contracts with customers [Member] | Consumer and Other | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 87,358 | 78,441 |
| Revenue from contracts with customers [Member] | Consumer and Other | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Corporate Operations | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Corporate Operations | Products [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Corporate Operations | Services [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | 0 | 0 |
| Revenue from contracts with customers [Member] | Corporate Operations | Management Fees [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Revenue from Contract with Customer | $ 0 | $ 0 |
Products, Services and Other Revenues (Schedule Of Receivables And Customer Deposits Related To Contracts With Customers) (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Contracts with customers [Member] | ||
| Receivables [Line Items] | ||
| Accounts Receivable, after Allowance for Credit Loss | $ 642.7 | $ 692.4 |
Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Catastrophe Current Year Claims and Claims Adjustment Expense | $ 35,028 | [1] | $ 66,064 | ||
| Retroactive reinsurance transaction with Hagerty Re, net losses and loss adjustment expenses | (62,202) | 0 | |||
| Favorable (adverse) development on prior years' loss reserves | 104,063 | 150,107 | |||
| Retroactive reinsurance transaction with Hagerty Re | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Retroactive reinsurance transaction with Hagerty Re, cash payments | 54,100 | ||||
| Retroactive reinsurance transaction with Hagerty Re | Hagerty, Inc. [Member] | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Retroactive reinsurance transaction with Hagerty Re, net losses and loss adjustment expenses | 62,200 | ||||
| Middle East conflict (2026) | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Catastrophe Current Year Claims and Claims Adjustment Expense | (35,000) | ||||
| California Wildfires (2025) | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Catastrophe Current Year Claims and Claims Adjustment Expense | (66,100) | ||||
| Markel Insurance excluding Global Reinsurance division | Professional liability, credit and surety, and workers' compensation insurance product lines [Member] | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Favorable (adverse) development on prior years' loss reserves | $ 64,400 | ||||
| Markel Insurance excluding Global Reinsurance division | Professional liability, general liability, marine and energy, and workers' compensation insurance product lines [Member] | |||||
| Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] | |||||
| Favorable (adverse) development on prior years' loss reserves | $ 125,200 | ||||
| |||||
Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] | ||
| Gross reserves for losses and loss adjustment expenses, beginning of year | $ 30,857,453 | $ 26,633,094 |
| Reinsurance recoverable on unpaid losses, beginning of year | 14,150,484 | 11,120,367 |
| Net reserves for losses and loss adjustment expenses, beginning of year | 16,706,969 | 15,512,727 |
| Effect of foreign currency rate changes on beginning of year balance | (36,345) | 56,701 |
| Adjusted net reserves for losses and loss adjustment expenses, beginning of year | 16,670,624 | 15,569,428 |
| Incurred losses and loss adjustment expenses, current accident year | 1,270,880 | 1,404,772 |
| Incurred losses and loss adjustment expenses, prior accident years | (104,063) | (150,107) |
| Total incurred losses and loss adjustment expenses | 1,166,817 | 1,254,665 |
| Payments, current accident year | 35,061 | 50,284 |
| Payments, prior accident years | 1,099,676 | 901,098 |
| Total payments | 1,134,737 | 951,382 |
| Effect of foreign currency rate changes on current year activity | (582) | 54 |
| Net reserves for losses and loss adjustment expenses of Markel CATCo Re | 0 | (121) |
| Retroactive reinsurance transaction with Hagerty Re, net losses and loss adjustment expenses | (62,202) | 0 |
| Net reserves for losses and loss adjustment expenses, end of period | 16,639,920 | 15,872,644 |
| Reinsurance recoverable on unpaid losses | 14,730,616 | 12,015,613 |
| Gross reserves for losses and loss adjustment expenses, end of period | $ 31,370,536 | $ 27,888,257 |
Reinsurance (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Fronting | ||
| SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] | ||
| Gross losses and loss adjustment expenses | $ 1,200.0 | $ 957.5 |
Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Effects of Reinsurance [Line Items] | ||
| Direct premiums written | $ 2,997,190 | $ 2,909,657 |
| Direct premiums earned | 3,080,198 | 2,934,728 |
| Assumed premiums written | 787,832 | 1,308,573 |
| Assumed premiums earned | 708,578 | 682,351 |
| Ceded premiums written | (1,939,976) | (1,907,939) |
| Ceded premiums earned | (1,739,890) | (1,527,705) |
| Net premiums written | 1,845,046 | 2,310,291 |
| Net premiums earned | 2,048,886 | 2,089,374 |
| Underwriting [Member] | ||
| Effects of Reinsurance [Line Items] | ||
| Direct premiums written | 2,069,454 | 2,135,972 |
| Direct premiums earned | 2,222,658 | 2,195,483 |
| Assumed premiums written | 219,774 | 729,042 |
| Assumed premiums earned | 340,669 | 438,045 |
| Ceded premiums written | (444,345) | (554,725) |
| Ceded premiums earned | (514,558) | (544,156) |
| Net premiums written | 1,844,883 | 2,310,289 |
| Net premiums earned | 2,048,769 | 2,089,372 |
| Fronting | ||
| Effects of Reinsurance [Line Items] | ||
| Direct premiums written | 927,736 | 773,685 |
| Direct premiums earned | 857,540 | 739,245 |
| Assumed premiums written | 568,058 | 579,531 |
| Assumed premiums earned | 367,909 | 244,306 |
| Ceded premiums written | (1,495,631) | (1,353,214) |
| Ceded premiums earned | (1,225,332) | (983,549) |
| Net premiums written | 163 | 2 |
| Net premiums earned | $ 117 | $ 2 |
Reinsurance (Ceded earned premiums to GEP & Assumed earned premiums to NEP) (Details) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] | ||
| Percentage of ceded earned premiums to gross earned premiums | 46.00% | 42.00% |
| Percentage of assumed earned premiums to net earned premiums | 35.00% | 33.00% |
Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Losses) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Effects of Reinsurance [Line Items] | ||
| Net losses and loss adjustment expenses | $ 1,166,817 | $ 1,254,665 |
| Underwriting [Member] | ||
| Effects of Reinsurance [Line Items] | ||
| Gross losses and loss adjustment expenses | 1,433,996 | 1,673,509 |
| Ceded losses and loss adjustment expenses | (267,480) | (418,927) |
| Net losses and loss adjustment expenses | $ 1,166,516 | $ 1,254,582 |
Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Related Party Transaction [Line Items] | |||
| Services and other revenues | $ 673,408 | $ 660,583 | |
| Premiums ceded | 1,939,976 | 1,907,939 | |
| Reinsurance recoverables | 15,195,825 | $ 14,616,279 | |
| Retroactive reinsurance transaction with Hagerty Re, net losses and loss adjustment expenses | (62,202) | 0 | |
| Nephila Reinsurers [Member] | |||
| Related Party Transaction [Line Items] | |||
| Reinsurance recoverables | 267,600 | 496,000 | |
| Hagerty, Inc. [Member] | |||
| Related Party Transaction [Line Items] | |||
| Reinsurance recoverables | 298,000 | 317,100 | |
| Hagerty, Inc. [Member] | Retroactive reinsurance transaction with Hagerty Re | |||
| Related Party Transaction [Line Items] | |||
| Retroactive reinsurance transaction with Hagerty Re, net losses and loss adjustment expenses | 62,200 | ||
| Retroactive reinsurance transaction with Hagerty Re, unearned premiums | $ 92,500 | ||
| Fronting | |||
| Related Party Transaction [Line Items] | |||
| Premiums ceded | 1,495,631 | 1,353,214 | |
| Fronting | Nephila Reinsurers [Member] | |||
| Related Party Transaction [Line Items] | |||
| Gross premium volume | 267,400 | 389,300 | |
| Premiums ceded | 267,400 | 389,300 | |
| Fronting | Hagerty, Inc. [Member] | |||
| Related Party Transaction [Line Items] | |||
| Gross premium volume | 253,300 | ||
| Premiums ceded | 242,100 | ||
| Fund Management | Unconsolidated entities managed by Nephila [Member] | |||
| Related Party Transaction [Line Items] | |||
| Services and other revenues | 40,500 | 25,500 | |
| Underwriting [Member] | |||
| Related Party Transaction [Line Items] | |||
| Premiums ceded | $ 444,345 | 554,725 | |
| Underwriting [Member] | Hagerty, Inc. [Member] | |||
| Related Party Transaction [Line Items] | |||
| Gross premium volume | 219,900 | ||
| Premiums ceded | $ 169,700 | ||
Shareholders' Equity (Narrative) (Details) - Series A preferred stock [Member] - $ / shares |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Class of Stock [Line Items] | ||
| Preferred stock, shares authorized | 10,000,000 | |
| Preferred stock, no par value | $ 0 | |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
Shareholders' Equity (Schedule of Common Stock Outstanding Roll Forward) (Details) - Common Stock [Member] - $ / shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Class of Stock [Line Items] | ||
| Common stock, shares authorized | 50,000,000 | |
| Common stock, no par value | $ 0 | |
| Shares, Issued, Beginning Balance | 12,589,631 | 12,790,117 |
| Common Stock, Shares, Outstanding, Beginning Balance | 12,589,631 | 12,790,117 |
| Issuance of common shares | 5,371 | 2,258 |
| Repurchase of common shares | (64,045) | (89,735) |
| Shares, Issued, Ending Balance | 12,530,957 | 12,702,640 |
| Common Stock, Shares, Outstanding, Ending Balance | 12,530,957 | 12,702,640 |
Shareholders' Equity (Schedule Of Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
||||
| Earnings Per Share [Line Items] | |||||
| Net income (loss) to shareholders | $ (212,289) | $ 121,714 | |||
| Adjustment and purchase of redeemable noncontrolling interests | (26,437) | 33,341 | |||
| Adjusted net income (loss) to shareholders | $ (238,726) | $ 155,055 | |||
| Weighted average basic common shares outstanding | 12,630 | 12,804 | |||
| Weighted average diluted common shares outstanding | 12,630 | 12,837 | |||
| Earnings Per Share, Basic | $ (18.90) | $ 12.11 | |||
| Earnings Per Share, Diluted | $ (18.90) | [1] | $ 12.08 | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 39 | ||||
| Restricted Stock Units (RSUs) [Member] | |||||
| Earnings Per Share [Line Items] | |||||
| Dilutive potential common shares from restricted stock units and restricted stock | 0 | [1] | 33 | ||
| |||||
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