Fair Value Measurements - Significant Unobservable Inputs of the Company’s Level 3 Financial Instruments (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 68,419,777	$ 50,743,911
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	61,482,810	43,504,923
Level 3 | First lien debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	57,154,971	41,336,737
Level 3 | First lien debt | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	56,304,438	40,753,427
Level 3 | First lien debt | Asset Recoverability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		89,674
Level 3 | First lien debt | Asset Recoverability | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	6,178
Level 3 | First lien debt | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	405,666
Level 3 | First lien debt | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 438,689	$ 493,636
Level 3 | First lien debt | Low | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.0320	0.0577
Level 3 | First lien debt | Low | Asset Recoverability | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.1033
Level 3 | First lien debt | Low | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	4.75	4.75
Level 3 | First lien debt | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	66.93	86.83
Level 3 | First lien debt | High | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.2267	0.3089
Level 3 | First lien debt | High | Asset Recoverability | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.1092
Level 3 | First lien debt | High | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	10.75	10.5
Level 3 | First lien debt | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	101.25	100.38
Level 3 | First lien debt | Weighted Average | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.0985	0.1005
Level 3 | First lien debt | Weighted Average | Asset Recoverability | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.1036
Level 3 | First lien debt | Weighted Average | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	9.9	9.26
Level 3 | First lien debt | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	99.51	98.02
Level 3 | Second lien debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,088,319	$ 926,865
Level 3 | Second lien debt | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,088,319	910,170
Level 3 | Second lien debt | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 16,695
Level 3 | Second lien debt | Low | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.0876	0.1007
Level 3 | Second lien debt | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		92.75
Level 3 | Second lien debt | High | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.2668	0.1531
Level 3 | Second lien debt | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		92.75
Level 3 | Second lien debt | Weighted Average | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.1079	0.1156
Level 3 | Second lien debt | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		92.75
Level 3 | Unsecured debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 157,115	$ 18,171
Level 3 | Unsecured debt | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 157,115	$ 18,171
Level 3 | Unsecured debt | Low | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	7.71	14.9
Level 3 | Unsecured debt | High | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	13.94	14.9
Level 3 | Unsecured debt | Weighted Average | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	8.83	14.9
Level 3 | Structured finance obligations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 365,899
Level 3 | Structured finance obligations | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 365,899
Level 3 | Structured finance obligations | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		86.18
Level 3 | Structured finance obligations | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		100.97
Level 3 | Structured finance obligations | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		97.97
Level 3 | Structured finance obligations - debt instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 590,509
Level 3 | Structured finance obligations - debt instruments | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 590,509
Level 3 | Structured finance obligations - debt instruments | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	92.45
Level 3 | Structured finance obligations - debt instruments | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	104.21
Level 3 | Structured finance obligations - debt instruments | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	100.78
Level 3 | Structured finance obligations - equity instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 141,139
Level 3 | Structured finance obligations - equity instruments | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 141,139
Level 3 | Structured finance obligations - equity instruments | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	21.89
Level 3 | Structured finance obligations - equity instruments | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	100
Level 3 | Structured finance obligations - equity instruments | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	87.1
Level 3 | Equity investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,350,757	$ 857,251
Level 3 | Equity investments | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	668,930	302,733
Level 3 | Equity investments | Asset Recoverability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	314,967	265,631
Level 3 | Equity investments | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	46,923
Level 3 | Equity investments | Market Quotations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	282,542
Level 3 | Equity investments | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		1,212
Level 3 | Equity investments | Market Quotations | Performance multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		227,117
Level 3 | Equity investments | Option Pricing Model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	29,559	$ 60,558
Level 3 | Equity investments | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 7,836
Level 3 | Equity investments | Low | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.0954	0.0993
Level 3 | Equity investments | Low | Asset Recoverability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	1.0000	1.0000
Level 3 | Equity investments | Low | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.105
Level 3 | Equity investments | Low | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		25.00
Level 3 | Equity investments | Low | Market Quotations | Performance multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	2.3	6.4
Level 3 | Equity investments | Low | Option Pricing Model | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.2350	0.3200
Level 3 | Equity investments | High | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.2884	0.1792
Level 3 | Equity investments | High | Asset Recoverability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	1.0000	1.0000
Level 3 | Equity investments | High | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.105
Level 3 | Equity investments | High | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		25.00
Level 3 | Equity investments | High | Market Quotations | Performance multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	30	30
Level 3 | Equity investments | High | Option Pricing Model | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.7050	0.5500
Level 3 | Equity investments | Weighted Average | Yield Analysis | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.1358	0.1318
Level 3 | Equity investments | Weighted Average | Asset Recoverability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	1.0000	1.0000
Level 3 | Equity investments | Weighted Average | Asset Recoverability | Market multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.105
Level 3 | Equity investments | Weighted Average | Market Quotations | Quoted price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input		25.00
Level 3 | Equity investments | Weighted Average | Market Quotations | Performance multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	18.87	21.27
Level 3 | Equity investments | Weighted Average | Option Pricing Model | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment measurement input	0.3600	0.4375