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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurements of Cash and Cash Equivalents, Restricted Cash, Investments, Derivatives, and Unfunded Revolving and Delayed Draw Loan Commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents $ 535.0 $ 303.0
Restricted cash 29.0 34.0
Total investments 22,873.7 [1] 21,779.8 [2]
Unfunded revolving and delayed draw loan commitments (32.0) (57.0)
Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives (24.0)  
Derivatives   (21.0)
Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 15.0  
Total    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Total investments 22,868.0 21,775.0
Level 1    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Cash and cash equivalents 535.0 303.0
Restricted cash 29.0 34.0
Total investments 48.0 54.0
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  
Derivatives   0.0
Level 1 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 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 736.0 360.0
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 (24.0)  
Derivatives   (21.0)
Level 2 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 15.0  
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 22,084.0 21,361.0
Unfunded revolving and delayed draw loan commitments (32.0) (57.0)
Level 3 | Foreign currency forward contract    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0  
Derivatives   0.0
Level 3 | Interest rate swap    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Derivatives 0.0  
Investments measured at net asset value    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Total investments $ 6.0 $ 5.0
[1] As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.     
[2] As of December 31, 2022, the estimated net unrealized loss for federal tax purposes was $0.2 billion based on a tax cost basis of $22.0 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.2 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.0 billion.