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Fair Value of Financial Instruments - Unobservable Inputs (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value $ 13,008.6 [1] $ 13,490.4 [2]
Level 3—Significant unobservable inputs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value $ 11,005.0 $ 12,035.0
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Minimum | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.046 0.058
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Minimum | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.099 0.113
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Minimum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.047 0.048
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Minimum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.038 0.043
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Maximum | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.249 0.238
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Maximum | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.151 0.154
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Maximum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.437 0.417
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Maximum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.201 0.248
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Weighted Average | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.104 0.106
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Weighted Average | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.124 0.127
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Weighted Average | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.126 0.128
Level 3—Significant unobservable inputs | Discounted Cash Flow | Discount Rate | Weighted Average | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.121 0.143
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Minimum | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.8 0.7
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Minimum | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 2.8 7.0
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Minimum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 1.0 1.0
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Minimum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 4.5 0.7
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Maximum | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 15.1 11.3
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Maximum | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 15.1 7.0
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Maximum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 1.3 1.4
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Maximum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 25.5 16.0
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Weighted Average | Senior Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 9.5 8.6
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Weighted Average | Subordinated Debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 7.9 7.0
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Weighted Average | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 1.1 1.2
Level 3—Significant unobservable inputs | Waterfall | EBITDA Multiple | Weighted Average | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 9.9 8.3
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Minimum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.100  
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Minimum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.100  
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Maximum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.100  
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Maximum | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.150  
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Weighted Average | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.100  
Level 3—Significant unobservable inputs | Waterfall | Illiquidity Discount | Weighted Average | Equity/Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.112  
Level 3—Significant unobservable inputs | Indicative Dealer Quotes | Minimum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.069 0.230
Level 3—Significant unobservable inputs | Indicative Dealer Quotes | Maximum | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.069 0.230
Level 3—Significant unobservable inputs | Indicative Dealer Quotes | Weighted Average | Asset Based Finance    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment owned, measurement input 0.069 0.230
Level 3—Significant unobservable inputs | Senior Debt | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value $ 6,500.0 $ 7,115.0
Level 3—Significant unobservable inputs | Senior Debt | Waterfall    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 1,400.0 1,376.0
Level 3—Significant unobservable inputs | Senior Debt | Cost    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 202.0 14.0
Level 3—Significant unobservable inputs | Senior Debt | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value   14.0
Level 3—Significant unobservable inputs | Subordinated Debt | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 112.0 188.0
Level 3—Significant unobservable inputs | Subordinated Debt | Waterfall    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 14.0 33.0
Level 3—Significant unobservable inputs | Subordinated Debt | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value   12.0
Level 3—Significant unobservable inputs | Asset Based Finance | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 1,103.0 1,513.0
Level 3—Significant unobservable inputs | Asset Based Finance | Waterfall    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 429.0 516.0
Level 3—Significant unobservable inputs | Asset Based Finance | Cost    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 49.0 41.0
Level 3—Significant unobservable inputs | Asset Based Finance | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 112.0 30.0
Level 3—Significant unobservable inputs | Asset Based Finance | Indicative Dealer Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 1.0 2.0
Level 3—Significant unobservable inputs | Equity/Other | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 457.0 538.0
Level 3—Significant unobservable inputs | Equity/Other | Waterfall    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value 607.0 625.0
Level 3—Significant unobservable inputs | Equity/Other | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, at fair value $ 19.0 $ 18.0
[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.