Investments - 2018-1 CLO Reset Notes (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 13, 2024	Mar. 31, 2026	Dec. 31, 2025
Debt
Total aggregate principal amount committed		$ 2,127,000	$ 2,077,000
Class A-2-R
Debt
Total aggregate principal amount committed	$ 30,000
Spread rate (as a percent)	2.90%
Bain Capital Senior Loan Program, LLC
Debt
Total aggregate principal amount committed		440,000
Bain Capital Senior Loan Program, LLC \| Class A-1-R
Debt
Total aggregate principal amount committed		$ 290,000
Spread rate (as a percent)		2.25%
Effective interest rate		5.92%
Bain Capital Senior Loan Program, LLC \| Class A-J-R
Debt
Total aggregate principal amount committed		$ 20,000
Spread rate (as a percent)		2.70%
Effective interest rate		6.37%
Bain Capital Senior Loan Program, LLC \| Class A-2-R
Debt
Total aggregate principal amount committed		$ 30,000
Spread rate (as a percent)		2.90%
Effective interest rate		6.57%
Bain Capital Senior Loan Program, LLC \| Class B-R
Debt
Total aggregate principal amount committed		$ 40,000
Spread rate (as a percent)		3.90%
Effective interest rate		7.57%
Bain Capital Senior Loan Program, LLC \| Class C-R
Debt
Total aggregate principal amount committed		$ 30,000
Spread rate (as a percent)		5.90%
Effective interest rate		9.57%
Bain Capital Senior Loan Program, LLC \| Class D-R
Debt
Total aggregate principal amount committed		$ 30,000
Spread rate (as a percent)		8.32%
Effective interest rate		11.99%