v3.26.3
Fair Value Measurements - Unobservable Inputs (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 12,946,234 $ 14,207,294
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 12,868,345 14,100,239
First lien debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 12,330,802 13,759,817
First lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 11,965,877 13,198,498
First lien debt | Market Quotations | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 97,739 98,494
First lien debt | Asset Recoverability | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 267,186  
First lien debt | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 462,825
First lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0742 0.0694
First lien debt | Low | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 94.00 97.25
First lien debt | Low | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 7.25 7.25
First lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.4790 0.1936
First lien debt | High | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 99.48 100.00
First lien debt | High | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 12.75 12.47
First lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1095 0.0944
First lien debt | Weighted Average | Market Quotations | Level 3 | Broker quoted price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 96.95 99.97
First lien debt | Weighted Average | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.73 11.23
Second lien debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 252,721 $ 231,650
Second lien debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0935 0.0845
Second lien debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.2154 0.1578
Second lien debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1100 0.1011
Unsecured debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 12,498  
Unsecured debt | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 12,479 $ 12,278
Unsecured debt | Asset Recoverability | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 19  
Unsecured debt | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   0.1510
Unsecured debt | High | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   0.1510
Unsecured debt | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1777 0.1510
Unsecured debt | Weighted Average | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 18.72  
Investments in equity | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 272,324 $ 96,494
Investments in equity | Yield Analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 174,970  
Investments in equity | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   19,678
Investments in equity | Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 74,389 62,579
Investments in equity | Asset Recoverability | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   3,002
Investments in equity | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 11,104  
Investments in equity | Asset Recoverability | Level 3 | Discount to Expected Proceeds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,082  
Investments in equity | Option Pricing Model | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 10,779 $ 11,235
Investments in equity | Low | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1025 0.1250
Investments in equity | Low | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.75 6.4
Investments in equity | Low | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 7.25 8.5
Investments in equity | Low | Asset Recoverability | Level 3 | Discount to Expected Proceeds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.2500  
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 0.7500 0.1950
Investments in equity | High | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 26.5 33.63
Investments in equity | High | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 12.75 16
Investments in equity | High | Asset Recoverability | Level 3 | Discount to Expected Proceeds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.8500  
Investments in equity | High | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.7050 0.7050
Investments in equity | Weighted Average | Yield Analysis | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1437 0.1508
Investments in equity | Weighted Average | Market Approach | Level 3 | Performance Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 12.36 12.28
Investments in equity | Weighted Average | Asset Recoverability | Level 3 | Market Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 9.33 11.22
Investments in equity | Weighted Average | Asset Recoverability | Level 3 | Discount to Expected Proceeds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.4474  
Investments in equity | Weighted Average | Option Pricing Model | Level 3 | Expected Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.3237 0.3334