v3.26.1
Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value $ 35,500,450 [1],[2] $ 35,918,948 [3],[4]
First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 30,985,887 31,597,264
Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 1,342,673 1,500,498
Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 439,084 479,850
Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 136,796 134,800
Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 506,595 496,312
Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 1,293,753 900,635
Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 457,746 435,238
Level 1    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 739,910 736,554
Investments at fair value 0 0
Derivative assets 0 0
Derivative liabilities 0 0
Level 1 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at 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]    
Investments at fair value 0 0
Level 1 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 1 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 1 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 1 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 1 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 2    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 0 0
Investments at fair value 3,574,081 4,468,669
Derivative assets 733 26,582
Derivative liabilities 17,125 2,060
Level 2 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 3,248,710 4,068,098
Level 2 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 321,954 394,837
Level 2 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 2 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 2 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 2 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 0 0
Level 2 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 3,417 5,734
Level 3    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 0 0
Investments at fair value 30,587,040 30,479,543
Derivative assets 0 0
Derivative liabilities 0 0
Level 3 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 27,737,177 27,529,166
Level 3 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 1,020,719 1,105,661
Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 439,084 479,850
Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 136,796 134,800
Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 506,595 496,312
Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 441,545 442,727
Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 305,124 291,027
Total    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 739,910 736,554
Investments at fair value 34,161,121 34,948,212
Derivative assets 733 26,582
Derivative liabilities 17,125 2,060
Total | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 30,985,887 31,597,264
Total | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 1,342,673 1,500,498
Total | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 439,084 479,850
Total | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 136,796 134,800
Total | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 506,595 496,312
Total | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 441,545 442,727
Total | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 308,541 296,761
Investments measured at Net Asset Value (“NAV”)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value $ 1,339,329 $ 970,736
[1] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on our restricted securities.
[2] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt”.
[3] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on our restricted securities.
[4] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt”.