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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Measurements of Cash and Cash Equivalents, Restricted Cash, Investments, Derivatives, and Unfunded Revolving and Delayed Draw Loan Commitments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents $ 1,036.0 $ 635.0
Restricted cash 218.0 225.0
Total investments 28,692.6 [1] 26,719.9 [2]
Unfunded revolving and delayed draw loan commitments (28.0) (29.0)
Derivatives (106.0) (62.0)
Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 1.0 24.0
Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 92.0 2.0
Total    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Total investments 28,676.0 26,711.0
Level 1    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents 1,036.0 635.0
Restricted cash 218.0 225.0
Total investments 21.0 33.0
Unfunded revolving and delayed draw loan commitments 0.0 0.0
Level 1 | Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0 0.0
Level 1 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0 0.0
Level 2    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Total investments 800.0 587.0
Unfunded revolving and delayed draw loan commitments 0.0 0.0
Level 2 | Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 1.0 24.0
Level 2 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 92.0 2.0
Level 3    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Total investments 27,855.0 26,091.0
Unfunded revolving and delayed draw loan commitments (28.0) (29.0)
Level 3 | Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0 0.0
Level 3 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0 0.0
Investments measured at net asset value    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Total investments $ 17.0 $ 9.0
[1] As of September 30, 2025, the estimated net unrealized gain for federal tax purposes was approximately $0.3 billion based on a tax cost basis of $28.4 billion. As of September 30, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.0 billion.
[2] As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.