Investments - ISLP Forward Foreign Currency Exchange Contracts (Parenthetical) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 11, 2023	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Open Forward Foreign Currency Contract [Line Items]
Net assets at end of period		$ 1,093,555	$ 1,117,410	$ 1,144,504
Restricted cash		$ 11,695	$ 26,809
Interest Rate Floor One
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.50%
Interest Rate Floor Two
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.50%	1.00%
Interest Rate Floor Three
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%	0.75%
Interest Rate Floor Four
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.75%	0.50%
Interest Rate Floor Five
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%	0.00%
International Senior Loan Program, LLC
Open Forward Foreign Currency Contract [Line Items]
Net assets at end of period		$ 45,043	$ 64,451
Debt Instrument, Basis Spread on Variable Rate	246.00%
Restricted cash		$ 3,595	$ 14,396
International Senior Loan Program, LLC \| Interest Rate Floor One
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%	1.00%
International Senior Loan Program, LLC \| Interest Rate Floor Two
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.75%	0.75%
International Senior Loan Program, LLC \| Interest Rate Floor Three
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%	0.50%
International Senior Loan Program, LLC \| Interest Rate Floor Four
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%	0.00%
International Senior Loan Program, LLC \| Interest Rate Floor Five
Open Forward Foreign Currency Contract [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.25%	0.25%