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Excludes equity attributable to redeemable non-controlling interests. [Member] Earnings from equity method investments Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic [Abstract] Other Noncurrent Liabilities Other Noncurrent Liabilities [Table Text Block] 2021 Interest Rate Swap 2021 Interest Rate Swap [Member] 2021 Interest Rate Swap Deferred Revenue, Noncurrent Deferred Revenue, Noncurrent Goodwill [Line Items] Goodwill [Line Items] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Earnings Per Share, Basic Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Liabilities Liabilities, Fair Value Disclosure [Abstract] Other Other Assets, Miscellaneous, Current Revenue Revenue from Contract with Customer [Text Block] Trade accounts payable Increase (Decrease) in Accounts Payable, Trade Total other 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Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common Stock, Shares Authorized Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Current assets: Assets, Current [Abstract] Total liabilities and stockholders’ equity Liabilities and Equity Fair Value, Recurring Fair Value, Recurring [Member] Operating model optimization program Adjusted EBITDA Adjustment - Operating Model Optimization Program Adjusted EBITDA Adjustment - Operating Model Optimization Program Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Maximum Maximum [Member] Less: net income attributable to noncontrolling interests Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Contingencies [Abstract] Contingencies [Abstract] Contingencies [Abstract] Segment, Expenditure, Addition to Long-Lived Assets Segment, Expenditure, Addition to Long-Lived Assets Accounting Policies [Abstract] Accounting Policies [Abstract] Finite-Lived Intangible Assets, Net Net Net, Beginning Balance Net, Ending Balance Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Treasury Stock Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Net Leverage Ratio Requirement Net Leverage Ratio Requirement Net Leverage Ratio Requirement Accrued Salaries, Current Accrued Salaries, Current Business Acquisitions Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Investments in consolidated affiliates, net of cash acquired Payments to Acquire Businesses and Interest in Affiliates Entity Shell Company Entity Shell Company Fair value of noncontrolling interest in acquired affiliate Noncontrolling Interest, Increase from Business Combination Other liabilities Total other liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Statement of Cash 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Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type Award Type [Axis] Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Corporate expense Adjusted EBITDA Adjustment - Corporate Expense Adjusted EBITDA Adjustment - Corporate Expense Legal Entity [Axis] Legal Entity [Axis] Business Combination, Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Total assets Assets Assets Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town Long Lived Asset [Line Items] Long Lived Asset [Line Items] Long Lived Asset [Line Items] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Segment Reporting, Other Segment Item, Amount Segment Reporting, Other 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Combination, Recognized Asset Acquired, Asset Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 -Significant Other Observable Input Fair Value, Inputs, Level 2 [Member] Income Tax Examination [Line Items] Income Tax Examination [Line Items] Equity Method Investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Provision for losses on trade accounts receivable Accounts Receivable, Credit Loss Expense (Reversal) Fair value of equity method investment Business Combination, Acquisition of Less than 100 Percent, Equity Method Investment, Fair Value Business Combination, Acquisition of Less than 100 Percent, Equity Method Investment, Fair Value Product And Fulfillment Product And Fulfillment Product And Fulfillment PEO PEO [Member] 2020 3 year Interest Rate Swap 2025 Interest Rate Swap [Member] 2025 Interest Rate Swap [Member] Foreign currency translation: Foreign Currency Translation [Abstract] Interest income Investment Income, Interest Net Leverage Ratio Requirement, Dividends Net Leverage Ratio Requirement, Dividends Net Leverage Ratio Requirement, Dividends Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Retained Earnings Retained Earnings [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Additions to Long Lived Assets Additions to Long Lived Assets [Table Text Block] Additions to Long Lived Assets (Provision) benefit for income taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Taxes Payable, Current Taxes Payable, Current Other intangibles, net of accumulated amortization of $2,830.0 and $2,716.3 Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Cash flow hedges, net Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Trans Union de Mexico, S.A., S.I.C. Trans Union de Mexico, S.A., S.I.C. [Member] Trans Union de Mexico, S.A., S.I.C. 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Interest City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued Liabilities, Current Accrued Liabilities, Current Depreciation and Amortization by Segment Depreciation and Amortization by Segment [Table Text Block] Depreciation and Amortization by Segment Incremental Borrowings Criteria, Percentage of Consolidated EBITDA Incremental Borrowings Criteria, Percentage of Consolidated EBITDA Incremental Borrowings Criteria, Percentage of Consolidated EBITDA Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Senior Secured Term Loan A-4 Senior Secured Term Loan A-4 [Member] Senior Secured Term Loan A-4 Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Net Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Covenant Dividend Restriction Percentage of Consolidated EBITDA Covenant Dividend Restriction Percentage of Consolidated EBITDA Covenant Dividend Restriction Percentage of Consolidated EBITDA Convertible notes receivable (Note 6) Notes Receivable, Fair Value Disclosure Other Liabilities Disclosure Other Liabilities Disclosure [Text 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Measure, Amount Current portion of long-term debt Less short-term debt and current portion of long-term debt Debt, Current Entity Address, State or Province Entity Address, State or Province Total current liabilities Liabilities, Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Consumer Interactive Consumer Interactive [Member] Consumer Interactive Vertical[Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Recent Accounting Pronouncements Not Yet Adopted Recent Accounting Pronouncements Not Yet Adopted [Policy Text Block] Recent Accounting Pronouncements Not Yet Adopted Individual: Individual [Axis] International International [Member] International Segment[Member] Limited Partnership Investment Limited Partnership Investment Limited Partnership Investment Dividends to shareholders Payments of Ordinary Dividends, Common Stock Other current assets Total other 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Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Long Lived Asset [Table] Long Lived Asset [Table] Long Lived Asset [Table] Internal use software Internal Use Software [Member] Internal use software. Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Right-of-use lease assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Accrued employee separation expenses Accrued Employee Benefits, Current Contingencies Disclosure Contingencies Disclosure [Text Block] Remaining equity interest Subsidiary, Ownership Percentage, Noncontrolling Owner Effective tax benefit rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Equity Securities, FV-NI, Realized Gain Equity Securities, FV-NI, Realized Gain Gain on acquisition of affiliate Gain on acquisition of affiliate Non-taxable gain Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain (Loss) Transaction costs Business Combination, Acquisition-Related Cost, 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Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Senior Secured Revolving Credit Facility, payable at any time without penalty no later than June 24, 2029, with periodic variable interest at Term SOFR, or alternate base rate, plus applicable margin (4.93% at March 31, 2026) Revolving Credit Facility [Member] Accounts Receivable Accounts Receivable [Policy Text Block] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Allowance for Doubtful Accounts 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Name [Axis] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Other Noncurrent Other Liabilities Other Noncurrent Other Liabilities Carrying amount as of the balance sheet date of noncurrent liabilities which have not been itemized or categorized in the footnotes to the financial statements and are a component of other liabilities, (other liabilities noncurrent), used to reflect the noncurrent portion of the liabilities (expected to be realized or consumed after one year, or the normal operating cycle, if longer). 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Fair Value Document Quarterly Report Document Quarterly Report Foreign exchange forward contract Foreign Currency Contract, Asset, Fair Value Disclosure Total Assets, Fair Value Disclosure Reconciliation of Other Significant Reconciling Items from Segments to Consolidated Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Depreciation and amortization Adjusted EBITDA Adjustment - Depreciation and Amortization Adjusted EBITDA Adjustment - Depreciation and Amortization Cost Method Investments Equity Securities without Readily Determinable Fair Value, Amount Number of Operating Segments Number of Operating Segments Contract With Customer Liability Noncurrent Recognition Period Contract With Customer, Liability, Noncurrent, Recognition Period Contract With Customer, Liability, Noncurrent, Recognition Period Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, 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plan Stock Issued During Period, Value, Employee Stock Purchase Plan Accounts Receivable, Allowance For Credit Loss, Write-off (Recovery) Accounts Receivable, Allowance For Credit Loss, Write-off (Recovery) Accounts Receivable, Allowance For Credit Loss, Write-off (Recovery) Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Disposals and retirements Other Intangible Assets [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Investments in and Advances to Affiliates [Abstract] Financial Services Financial Services [Member] Financial Services [Member] Net change on interest rate swap Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Goodwill Goodwill Disclosure [Text Block] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Canada CANADA Compensation Amount Outstanding Recovery Compensation Amount Face amount of debt Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Other Current Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Other Assets Other Assets Disclosure [Text Block] Monevo Limited Monevo Limited [Member] Monevo Limited Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Treasury stock at cost; 7.3 million and 7.0 million shares at March 31, 2026 and December 31, 2025, respectively Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Gross Goodwill Goodwill, Gross Incremental Borrowings Criteria, Senior Secured Leverage ratio Incremental Borrowings Criteria, Senior Secured Leverage ratio Incremental Borrowings Criteria, Senior Secured Leverage ratio Net, period increase (decrease) Finite-Lived Intangible Assets, Increase (Decrease), Net Finite-Lived Intangible Assets, Increase (Decrease), Net Litigation Case [Axis] Litigation Case [Axis] Segments [Domain] Segments [Domain] Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total equity interest Business Combination, Achieved in Stages, Preacquisition and Acquired Equity Interests in Acquiree, Percentage Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Other assets Assets, Noncurrent [Abstract] Net Unrealized Gain/(Loss) On  Available-for-sale Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Purchase accounting measurement period adjustments Goodwill, Measurement Period Adjustment Developed technology Reacquired Rights [Member] Reacquired Rights Company Selected Measure Name Company Selected Measure Name Debt Disclosure Debt Disclosure [Text Block] Preferred stock, $0.01 par value; 100.0 million shares authorized; none issued or outstanding as of March 31, 2026 and December 31, 2025, respectively Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability All Executive Categories All Executive Categories [Member] Common stock, $0.01 par value; 1.0 billion shares authorized at March 31, 2026 and December 31, 2025, 200.0 million and 199.4 million shares issued at March 31, 2026 and December 31, 2025, respectively, and 192.8 million and 192.4 million shares outstanding as of March 31, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Total adjustments Adjusted EBITDA Adjustment - Total Adjusted EBITDA Adjustment - Total adjustments to Adjusted EBITDA Goodwill [Roll Forward] Goodwill [Roll Forward] Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Dividends paid to shareholders of acquired affiliate Dividends Paid To Shareholders Of Acquired Affiliate Dividends Paid To Shareholders Of Acquired Affiliate Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Emerging Verticals Emerging Verticals [Member] Emerging Verticals [Member] Preliminary Fair Value Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Business 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