v3.26.1
Fair Value of Financial Instruments - Significant Unobservable Inputs (Details)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 21,508,598,400 $ 11,549,149,400
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 14,497,808,000 5,935,498,000
Level 3 | First lien senior secured loans | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 10,364,836,000  
Level 3 | First lien senior secured loans | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 4,384,607,000
Level 3 | First lien senior secured loans | Yield analysis | Market yield | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.055 0.063
Level 3 | First lien senior secured loans | Yield analysis | Market yield | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.191 0.158
Level 3 | First lien senior secured loans | Yield analysis | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.091 0.10
Level 3 | First lien senior secured loans | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 167,884,000  
Level 3 | First lien senior secured loans | Broker quotes | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 263,920,000
Level 3 | First lien senior secured loans | Transaction cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 10,150,000  
Level 3 | Second lien senior secured loans | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 141,949,000  
Level 3 | Second lien senior secured loans | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 29,942,000
Level 3 | Second lien senior secured loans | Yield analysis | Market yield | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.082 0.096
Level 3 | Second lien senior secured loans | Yield analysis | Market yield | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.196 0.16
Level 3 | Second lien senior secured loans | Yield analysis | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.129 0.113
Level 3 | Senior subordinated loans | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 1,032,512,000  
Level 3 | Senior subordinated loans | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 213,500,000
Level 3 | Senior subordinated loans | Yield analysis | Market yield | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.07 0.084
Level 3 | Senior subordinated loans | Yield analysis | Market yield | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.247 0.183
Level 3 | Senior subordinated loans | Yield analysis | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.106 0.113
Level 3 | Senior subordinated loans | Transaction cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 31,244,000  
Level 3 | Corporate bonds | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 99,063,000 $ 40,286,000
Level 3 | Corporate bonds | Transaction cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   25,026,000
Level 3 | Collateralized loan obligations | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,047,274,000 344,155,000
Level 3 | Collateralized loan obligations | Transaction cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 3,990,000 26,830,000
Level 3 | Commercial mortgage-backed securities | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 99,962,000 29,161,000
Level 3 | Private asset-backed investments | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.087  
Level 3 | Private asset-backed investments | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 202,865,000  
Level 3 | Private asset-backed investments | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 99,799,000
Level 3 | Private asset-backed investments | Yield analysis | Market yield | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.04 0.026
Level 3 | Private asset-backed investments | Yield analysis | Market yield | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.138 0.138
Level 3 | Private asset-backed investments | Yield analysis | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.10 0.088
Level 3 | Private asset-backed investments | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 50,750,000 $ 29,782,000
Level 3 | Private asset-backed investments | Transaction cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 41,570,000 74,643,000
Level 3 | Private asset-backed investments | Income (other)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 5,762,000  
Level 3 | Private asset-backed investments | Income (other) | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.017  
Level 3 | Private asset-backed investments | Income (other) | Constant default rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 4,133,000
Level 3 | Private asset-backed investments | Income (other) | Constant default rate | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0 0
Level 3 | Private asset-backed investments | Income (other) | Constant default rate | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.07 0.103
Level 3 | Private asset-backed investments | Income (other) | Constant default rate | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input   0.04
Level 3 | Investments in joint ventures | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 391,000,000  
Level 3 | Investments in joint ventures | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.10  
Level 3 | Preferred equity | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.071  
Level 3 | Preferred equity | Yield analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 152,001,000  
Level 3 | Preferred equity | Yield analysis | Market yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 67,424,000
Level 3 | Preferred equity | Yield analysis | Market yield | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.098 0.098
Level 3 | Preferred equity | Yield analysis | Market yield | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.15 0.15
Level 3 | Preferred equity | Yield analysis | Market yield | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.129 0.125
Level 3 | Preferred equity | EV market multiple analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 165,475,000  
Level 3 | Preferred equity | EV market multiple analysis | EBITDA multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 55,146,000
Level 3 | Preferred equity | EV market multiple analysis | EBITDA multiple | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.071 0.034
Level 3 | Preferred equity | EV market multiple analysis | EBITDA multiple | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.225 0.23
Level 3 | Preferred equity | EV market multiple analysis | EBITDA multiple | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 12.4 18.1
Level 3 | Other equity | EV market multiple analysis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 489,521,000  
Level 3 | Other equity | EV market multiple analysis | EBITDA multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 247,144,000
Level 3 | Other equity | EV market multiple analysis | EBITDA multiple | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.072 0.08
Level 3 | Other equity | EV market multiple analysis | EBITDA multiple | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.33 0.346
Level 3 | Other equity | EV market multiple analysis | EBITDA multiple | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 15.1 12.7