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Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value $ 13,008.6 [1] $ 13,490.4 [2]
Level 1—Price quotations in active markets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 22.0 1.0
Level 2—Significant other observable inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 14.0 91.0
Level 3—Significant unobservable inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 11,005.0 12,035.0
Investments measured at net asset value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value $ 1,968.0 $ 1,363.0
[1] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.
[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.