v3.26.1
Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy of Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) $ 213,506 $ 282,924
Fair Value 14,680,538 14,286,039
First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 11,444,661 10,979,070
Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 478,763 568,641
Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 464,478 477,128
Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 40,774 37,452
Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 951,696 1,072,481
Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 747,669 722,100
Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 515,617 375,812
Interest Rate Swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Derivative assets 22,441 26,732
Derivative liabilities 5,538 1,941
Level 1    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 213,506 282,924
Fair Value 226,657 706
Level 1 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 226,657 706
Level 1 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 1 | Interest Rate Swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 0  
Fair Value 350,648 481,386
Level 2 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 276,990 318,098
Level 2 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 45,619 125,924
Level 2 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 2 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 2 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 2 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 28,039 37,364
Level 2 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 0 0
Level 2 | Interest Rate Swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Derivative assets 22,441 26,732
Derivative liabilities 5,538 1,941
Level 3    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 0  
Fair Value 13,682,085 13,590,644
Level 3 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 11,167,671 10,660,972
Level 3 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 433,144 442,717
Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 464,478 477,128
Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 40,774 37,452
Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 951,696 1,072,481
Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 455,042 684,030
Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 169,280 215,864
Level 3 | Interest Rate Swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Levels 1, Level 2, and Level 3    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 14,259,390 14,072,736
Levels 1, Level 2, and Level 3 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 11,444,661 10,979,070
Levels 1, Level 2, and Level 3 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 478,763 568,641
Levels 1, Level 2, and Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 464,478 477,128
Levels 1, Level 2, and Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 40,774 37,452
Levels 1, Level 2, and Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 951,696 1,072,481
Levels 1, Level 2, and Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 709,738 722,100
Levels 1, Level 2, and Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 169,280 215,864
Investments measured at NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 421,148 $ 213,303