v3.26.3
Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets, at fair value:    
Total investments $ 11,306.5 [1],[2] $ 13,008.6 [3],[4]
Total assets, at fair value: 11,322.0 13,068.0
Liabilities, at fair value:    
Liabilities, at fair value: 2.0 10.0
Interest rate swaps 1.9 10.4
Total liabilities, at fair value: 62.0 10.0
Foreign currency forward contracts    
Assets, at fair value:    
Derivative asset 3.0 0.0
Liabilities, at fair value:    
Liabilities, at fair value: 2.0 10.0
Foreign currency forward contracts | Location, Statement of Financial Position, Balance [Axis]: us-gaap:UnrealizedGainLossOnDerivatives    
Liabilities, at fair value:    
Liabilities, at fair value: 2.0 10.0
Interest rate swaps    
Assets, at fair value:    
Total investments (60.0) 59.0
Derivative asset 0.0 59.0
Liabilities, at fair value:    
Liabilities, at fair value: (60.0)  
Interest rate swaps 60.0 0.0
Money market funds    
Assets, at fair value:    
Cash equivalents 13.0  
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Assets, at fair value:    
Total investments 9,672.0 11,041.0
Level 1    
Assets, at fair value:    
Total investments 0.0 22.0
Total assets, at fair value: 13.0 22.0
Liabilities, at fair value:    
Total liabilities, at fair value: 0.0 0.0
Level 1 | Foreign currency forward contracts    
Assets, at fair value:    
Derivative asset 0.0 0.0
Liabilities, at fair value:    
Liabilities, at fair value: 0.0 0.0
Level 1 | Interest rate swaps    
Assets, at fair value:    
Derivative asset 0.0 0.0
Liabilities, at fair value:    
Interest rate swaps 0.0 0.0
Level 1 | Money market funds    
Assets, at fair value:    
Cash equivalents 13.0  
Level 2    
Assets, at fair value:    
Total investments 9.0 14.0
Total assets, at fair value: 12.0 73.0
Liabilities, at fair value:    
Total liabilities, at fair value: 62.0 10.0
Level 2 | Foreign currency forward contracts    
Assets, at fair value:    
Derivative asset 3.0 0.0
Liabilities, at fair value:    
Liabilities, at fair value: 2.0 10.0
Level 2 | Interest rate swaps    
Assets, at fair value:    
Derivative asset 0.0 59.0
Liabilities, at fair value:    
Interest rate swaps 60.0 0.0
Level 2 | Money market funds    
Assets, at fair value:    
Cash equivalents 0.0  
Level 3    
Assets, at fair value:    
Total investments 9,663.0 11,005.0
Total assets, at fair value: 9,663.0 11,005.0
Liabilities, at fair value:    
Total liabilities, at fair value: 0.0 0.0
Level 3 | Foreign currency forward contracts    
Assets, at fair value:    
Derivative asset 0.0 0.0
Liabilities, at fair value:    
Liabilities, at fair value: 0.0 0.0
Level 3 | Interest rate swaps    
Assets, at fair value:    
Derivative asset 0.0 0.0
Liabilities, at fair value:    
Interest rate swaps 0.0 0.0
Level 3 | Money market funds    
Assets, at fair value:    
Cash equivalents 0.0  
Investments measured at net asset value    
Assets, at fair value:    
Total investments $ 1,634.0 $ 1,968.0
[1] Security may be an obligation of one or more entities affiliated with the named company.
[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.
[3] Security may be an obligation of one or more entities affiliated with the named company.
[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.