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]    
Investments at fair value $ 35,690,147 [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 31,053,486 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 1,320,759 1,500,498
Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 441,892 479,850
Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 146,790 134,800
Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 491,965 496,312
Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 491,911 435,238
Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 1,390,072 900,635
Total    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 753,496 736,554
Investments at fair value 34,296,943 34,948,212
Derivative assets 1,294 26,582
Derivative liabilities 53,047 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 31,053,486 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 1,320,759 1,500,498
Total | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 441,892 479,850
Total | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 146,790 134,800
Total | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 491,965 496,312
Total | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 339,313 296,761
Total | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 502,738 442,727
Level 1    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 753,496 736,554
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 | Common 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 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 3,289,952 4,468,669
Derivative assets 1,294 26,582
Derivative liabilities 53,047 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 2,996,555 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 233,498 394,837
Level 2 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 56,120 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 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 3,779 5,734
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 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 31,006,991 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 28,056,931 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 1,087,261 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 385,772 479,850
Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 146,790 134,800
Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 491,965 496,312
Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 335,534 291,027
Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value 502,738 442,727
Investments measured at Net Asset Value (“NAV”)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments at fair value $ 1,393,204 $ 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 Company’s Amended and Restated Senior Secured Revolving Credit Agreement (the “Revolving Credit Facility”), credit facilities to which certain of our subsidiaries are parties (the “SPV Asset Facilities”) and collateral loan obligation transactions (“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.”