Investments - 2018-1 CLO Reset Notes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Debt
Total aggregate principal amount committed	$ 2,127,000	$ 2,077,000
Bain Capital Senior Loan Program, LLC
Debt
Total aggregate principal amount committed	446,000
Bain Capital Senior Loan Program, LLC \| Class A-1-L
Debt
Total aggregate principal amount committed	$ 150,000
Spread rate (as a percent)	1.67%
Effective interest rate	5.35%
Bain Capital Senior Loan Program, LLC \| Class A-1-R
Debt
Total aggregate principal amount committed	$ 140,000
Spread rate (as a percent)	1.67%
Effective interest rate	5.35%
Bain Capital Senior Loan Program, LLC \| Class A-2-FR
Debt
Total aggregate principal amount committed	$ 13,000
Spread rate (as a percent)	5.81%
Effective interest rate	5.81%
Bain Capital Senior Loan Program, LLC \| Class A-2-R
Debt
Total aggregate principal amount committed	$ 17,000
Spread rate (as a percent)	2.05%
Effective interest rate	5.73%
Bain Capital Senior Loan Program, LLC \| Class A-J-R
Debt
Total aggregate principal amount committed	$ 20,000
Spread rate (as a percent)	1.90%
Effective interest rate	5.58%
Bain Capital Senior Loan Program, LLC \| Class B-F-R
Debt
Total aggregate principal amount committed	$ 5,000
Spread rate (as a percent)	6.78%
Effective interest rate	6.78%
Bain Capital Senior Loan Program, LLC \| Class B-R
Debt
Total aggregate principal amount committed	$ 35,000
Spread rate (as a percent)	3.00%
Effective interest rate	6.68%
Bain Capital Senior Loan Program, LLC \| Class C-R
Debt
Total aggregate principal amount committed	$ 30,000
Spread rate (as a percent)	4.71%
Effective interest rate	8.39%
Bain Capital Senior Loan Program, LLC \| Class D-R
Debt
Total aggregate principal amount committed	$ 30,000
Spread rate (as a percent)	7.70%
Effective interest rate	11.38%
Bain Capital Senior Loan Program, LLC \| Class X-R-R
Debt
Total aggregate principal amount committed	$ 6,000
Spread rate (as a percent)	1.10%
Effective interest rate	4.78%