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Fair Value Measurements - Unobservable Inputs (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 9,868,440 $ 9,617,248
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 9,710,582 9,472,796
First lien debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 9,564,203 9,275,511
First lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 9,533,700 9,037,133
First lien debt | Asset Recoverability | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 30,503  
First lien debt | Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 238,378
First lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0768 0.0683
First lien debt | Low | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.5  
First lien debt | Low | Market Approach | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   82.00
First lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.3089 0.1984
First lien debt | High | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.5  
First lien debt | High | Market Approach | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   96.75
First lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1031 0.1013
First lien debt | Weighted Average | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.5  
First lien debt | Weighted Average | Market Approach | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   94.19
Second lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 41,515 $ 46,336
Second lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1018 0.1043
Second lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1438 0.1425
Second lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1269 0.1260
Unsecured debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 9,924  
Unsecured debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.9  
Unsecured debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.9  
Unsecured debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.9  
Investments in equity | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 94,940 $ 150,949
Investments in equity | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 6,402 22,686
Investments in equity | Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 60,007 105,782
Investments in equity | Option Pricing Model | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 28,531 $ 22,481
Investments in equity | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1075 0.1131
Investments in equity | Low | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.4 5.5
Investments in equity | Low | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.3200 0.3000
Investments in equity | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1792 0.1375
Investments in equity | High | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 30 29
Investments in equity | High | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.5500 0.5000
Investments in equity | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1417 0.1274
Investments in equity | Weighted Average | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 11.47 13.41
Investments in equity | Weighted Average | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.4286 0.4346