v3.25.1
Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy of Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 29,460,409 $ 26,378,894 [1],[2],[3],[4],[5]
Total DerivativesDerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag Total Derivatives Total Derivatives
First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 26,699,852 $ 23,665,142
Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 766,222 767,392
Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 457,391 440,633
Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 436,093 364,672
Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 803,269 825,152
Level 1    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 535,811 1,006,483
Fair Value 0 0
Total Derivatives 0 0
Level 1 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 0 0
Level 1 | Cross-currency swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 0 0
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 | 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 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
Fair Value 5,295,378 4,632,331
Total Derivatives (2,955) (76,295)
Level 2 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 14,291 (55,660)
Level 2 | Cross-currency swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives (17,246) (20,635)
Level 2 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 4,967,033 4,242,228
Level 2 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 249,668 315,966
Level 2 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 73,803 74,137
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 4,874 0
Level 3    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 0 0
Fair Value 23,600,920 21,098,813
Total Derivatives 0 0
Level 3 | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 0 0
Level 3 | Cross-currency swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 0 0
Level 3 | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 21,732,819 19,422,914
Level 3 | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 516,554 451,426
Level 3 | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 383,588 366,496
Level 3 | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 436,093 364,672
Level 3 | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 531,866 493,305
Total    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cash (including restricted and foreign cash) 535,811 1,006,483
Fair Value 28,896,298 25,731,144
Total Derivatives (2,955) (76,295)
Total | Interest rate swaps    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives 14,291 (55,660)
Total | Cross-currency swap    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total Derivatives (17,246) (20,635)
Total | First-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 26,699,852 23,665,142
Total | Second-lien senior secured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 766,222 767,392
Total | Unsecured debt investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 457,391 440,633
Total | Preferred equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 436,093 364,672
Total | Common equity investments    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 536,740 493,305
Investments measured at Net Asset Value (“NAV”)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 564,111 $ 647,750
[1] Certain portfolio company investments are subject to contractual restrictions on sales.
[2] Unless otherwise indicated, all investments are considered Level 3 investments.
[3] Unless otherwise indicated, all investments are non-controlled, non-affiliated investments. Non-controlled, non-affiliated investments are defined as investments in which the Company owns less than 5% of the portfolio company’s outstanding voting securities and does not have the power to exercise control over the management or policies of such portfolio company.
[4] Unless otherwise indicated, represents a co-investment made with the Company’s affiliates in accordance with the terms of exemptive relief that the Company received from the U.S. Securities and Exchange Commission. See Note 3 “Agreements and Related Party Transactions”.
[5] 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”.