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Fair Value Measurements - Unobservable Inputs (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 10,439,173 $ 9,868,440
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 10,330,365 9,710,582
First lien debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 10,178,311 9,564,203
First lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 10,082,833 9,533,700
First lien debt | Market Quotations | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 51,247  
First lien debt | Asset Recoverability | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 44,231 $ 30,503
First lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0537 0.0768
First lien debt | Low | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 100.00  
First lien debt | Low | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10 10.5
First lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.3072 0.3089
First lien debt | High | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 100.00  
First lien debt | High | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.5 10.5
First lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1058 0.1031
First lien debt | Weighted Average | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 100.00  
First lien debt | Weighted Average | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.34 10.5
Second lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 41,515 $ 41,515
Second lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0990 0.1018
Second lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1498 0.1438
Second lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1307 0.1269
Unsecured debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 11,859 $ 9,924
Unsecured debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.78 0.1490
Unsecured debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14 0.1490
Unsecured debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.97 0.1490
Investments in equity | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 98,680 $ 94,940
Investments in equity | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 6,618 6,402
Investments in equity | Market Quotations | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 62,990 60,007
Investments in equity | Option Pricing Model | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 29,072 $ 28,531
Investments in equity | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1100 0.1075
Investments in equity | Low | Market Quotations | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 6.44 6.40
Investments in equity | Low | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.3200 0.3200
Investments in equity | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1792 0.1792
Investments in equity | High | Market Quotations | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 30 30.00
Investments in equity | High | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.5700 0.5500
Investments in equity | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1434 0.1417
Investments in equity | Weighted Average | Market Quotations | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 11.59 11.47
Investments in equity | Weighted Average | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.4306 0.4286