Fair Value Measurements - Summary of Quantitative Information about Significant Unobservable Inputs of Level 3 financial instruments (Details) - Level 3 $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 3,083,940	$ 1,358,933
First Lien Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	2,971,648	1,200,165
First Lien Debt [Member] | Market Yield Analysis | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 2,849,235	$ 1,126,991
First Lien Debt [Member] | Market Yield Analysis | Maximum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	16.49	25
First Lien Debt [Member] | Market Yield Analysis | Minimum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	7.8	9.31
First Lien Debt [Member] | Market Yield Analysis | Weighted Average | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	11.2	12.11
First Lien Debt [Member] | Recent Transaction | Transaction Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 122,413	$ 73,174
First Lien Debt [Member] | Recent Transaction | Maximum | Transaction Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	100	98.58
First Lien Debt [Member] | Recent Transaction | Minimum | Transaction Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	93	98
First Lien Debt [Member] | Recent Transaction | Weighted Average | Transaction Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	98.46	98.07
Second Lien Debt [Member] | Market Yield Analysis | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 51,445	$ 130,876
Second Lien Debt [Member] | Market Yield Analysis | Maximum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	13.52	14.97
Second Lien Debt [Member] | Market Yield Analysis | Minimum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	10.82	12.01
Second Lien Debt [Member] | Market Yield Analysis | Weighted Average | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	13.26	13.4
Preferred Equity [Member] | Market Yield Analysis | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 60,632	$ 27,892
Preferred Equity [Member] | Market Yield Analysis | Maximum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	9.05	19.78
Preferred Equity [Member] | Market Yield Analysis | Minimum | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	9.05	9.42
Preferred Equity [Member] | Market Yield Analysis | Weighted Average | Market Yield Discount Rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	15.62	17.01
Preferred Equity [Member] | Black-Scholes | Maximum | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	33.96	34.9
Preferred Equity [Member] | Black-Scholes | Minimum | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	33.96	34.9
Preferred Equity [Member] | Black-Scholes | Weighted Average | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	33.96	34.9
Warrant [Member] | Black-Scholes | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 215
Warrant [Member] | Black-Scholes | Maximum | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	31.13
Warrant [Member] | Black-Scholes | Minimum | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	31.13
Warrant [Member] | Black-Scholes | Weighted Average | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range	31.13