v3.26.1
Investments - 2024-1 Notes (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 2,127,000,000 $ 2,077,000,000
Bain Capital Senior Loan Program, LLC    
Debt Instrument [Line Items]    
Total aggregate principal amount committed 440,000,000  
Bain Capital Senior Loan Program, LLC | Class A-1 Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 250,750  
Spread rate (as a percent) 1.75%  
Effective interest rate 5.42%  
Bain Capital Senior Loan Program, LLC | Class A-2 Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 12,750  
Spread rate (as a percent) 1.95%  
Effective interest rate 5.62%  
Bain Capital Senior Loan Program, LLC | Class B Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 25,500  
Spread rate (as a percent) 2.05%  
Effective interest rate 5.72%  
Bain Capital Senior Loan Program, LLC | Class C Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 34,000  
Spread rate (as a percent) 2.75%  
Effective interest rate 6.42%  
Bain Capital Senior Loan Program, LLC | Class D Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed $ 25,500  
Spread rate (as a percent) 4.50%  
Effective interest rate 8.17%  
Bain Capital Senior Loan Program, LLC | 2024-1 Notes    
Debt Instrument [Line Items]    
Total aggregate principal amount committed [1] $ 348,500  
[1]

(1) As of March 31, 2026, there were no Class E Notes outstanding.