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Investment Portfolio - Investment Portfolio At Cost And Fair Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 13,740.8 $ 14,044.0
Fair Value 13,008.6 [1] 13,490.4 [2]
Senior Secured Loans—First Lien    
Schedule of Investments [Line Items]    
Amortized Cost 7,819.4 7,995.1
Fair Value 7,523.4 [1] 7,794.9 [2]
Senior Secured Loans—Second Lien    
Schedule of Investments [Line Items]    
Amortized Cost 598.0 690.0
Fair Value 539.0 692.8 [2]
Other Senior Secured Debt    
Schedule of Investments [Line Items]    
Amortized Cost 65.0 130.0
Fair Value 55.0 123.0
Subordinated Debt    
Schedule of Investments [Line Items]    
Amortized Cost 122.0 214.0
Fair Value 126.0 233.0
Asset Based Finance    
Schedule of Investments [Line Items]    
Amortized Cost 1,830.9 2,231.9
Fair Value 1,693.7 [1] 2,101.7 [2]
Credit Opportunities Partners JV, LLC    
Schedule of Investments [Line Items]    
Amortized Cost 2,201.9 1,571.7
Fair Value 1,967.9 [1] 1,363.3 [2]
Equity/Other    
Schedule of Investments [Line Items]    
Amortized Cost 1,104.0 1,211.0
Fair Value $ 1,104.0 $ 1,181.0
Percentage of Portfolio | Customer Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Portfolio 100.00% 100.00%
Percentage of Portfolio | Customer Concentration Risk | Senior Secured Loans—First Lien    
Schedule of Investments [Line Items]    
Percentage of Portfolio 57.80% 57.80%
Percentage of Portfolio | Customer Concentration Risk | Senior Secured Loans—Second Lien    
Schedule of Investments [Line Items]    
Percentage of Portfolio 4.20% 5.10%
Percentage of Portfolio | Customer Concentration Risk | Other Senior Secured Debt    
Schedule of Investments [Line Items]    
Percentage of Portfolio 0.40% 0.90%
Percentage of Portfolio | Customer Concentration Risk | Subordinated Debt    
Schedule of Investments [Line Items]    
Percentage of Portfolio 1.00% 1.70%
Percentage of Portfolio | Customer Concentration Risk | Asset Based Finance    
Schedule of Investments [Line Items]    
Percentage of Portfolio 13.00% 15.60%
Percentage of Portfolio | Customer Concentration Risk | Credit Opportunities Partners JV, LLC    
Schedule of Investments [Line Items]    
Percentage of Portfolio 15.10% 10.10%
Percentage of Portfolio | Customer Concentration Risk | Equity/Other    
Schedule of Investments [Line Items]    
Percentage of Portfolio 8.50% 8.80%
[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.