v3.26.1
Fair Value of Investments - 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]    
Total Investments at Fair Value $ 15,344,201 [1],[2] $ 16,470,893 [3],[4]
Foreign currency forward contracts    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 7,487  
Liabilities   793
Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets (4,613) 3,123
First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 11,035,403 12,048,934
Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 773,357 848,575
Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 369,374 399,962
Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 159,598 157,297
Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 536,853 568,977
Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 665,746 644,304
Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 1,414,987 1,386,739
Levels 1, Level 2, and Level 3    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 455,400 568,542
Total Investments at Fair Value 14,427,670 15,665,020
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]    
Total Investments at Fair Value 11,035,403 12,048,934
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]    
Total Investments at Fair Value 773,357 848,575
Levels 1, Level 2, and Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 369,374 399,962
Levels 1, Level 2, and Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 159,598 157,297
Levels 1, Level 2, and Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 536,853 568,977
Levels 1, Level 2, and Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 541,761 527,097
Levels 1, Level 2, and Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 1,011,324 1,114,178
Level 1    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 455,400 568,542
Total Investments at Fair Value 0 0
Level 1 | Foreign currency forward contracts    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 0  
Liabilities   0
Level 1 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 0 0
Level 1 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total 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]    
Total Investments at Fair Value 0 0
Level 1 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total 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]    
Total Investments at Fair Value 0 0
Level 1 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 0 0
Level 1 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total 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]    
Total 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
Total Investments at Fair Value 78,571 92,876
Level 2 | Foreign currency forward contracts    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 7,487  
Liabilities   793
Level 2 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets (4,613) 3,123
Level 2 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 31,483 39,027
Level 2 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 43,181 47,294
Level 2 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total 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]    
Total Investments at Fair Value 0 0
Level 2 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 0 0
Level 2 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 3,907 6,555
Level 2 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total 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
Total Investments at Fair Value 14,349,099 15,572,144
Level 3 | Foreign currency forward contracts    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 0  
Liabilities   0
Level 3 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Assets 0 0
Level 3 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 11,003,920 12,009,907
Level 3 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 730,176 801,281
Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 369,374 399,962
Level 3 | Specialty finance debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 159,598 157,297
Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 536,853 568,977
Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 537,854 520,542
Level 3 | Specialty finance equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value 1,011,324 1,114,178
NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Investments at Fair Value $ 916,531 $ 805,873
[1] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s 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 the Company’s 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.”