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Investments - SLP (Details) - USD ($)
6 Months Ended
Mar. 13, 2024
Sep. 27, 2023
Jun. 15, 2023
Aug. 24, 2022
Mar. 07, 2022
Feb. 09, 2022
Jun. 30, 2024
Jun. 30, 2023
May 20, 2024
Dec. 31, 2023
Aug. 09, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             $ 2,237,491,000     $ 2,298,343,000  
Investments sold             1,276,500,000        
Proceeds from principal payments and sales of investments             747,376,000 $ 435,472,000      
Maximum borrowing capacity                 $ 1,500,000,000    
Total aggregate principal amount committed             $ 1,807,500,000     $ 1,617,500,000  
Weighted average interest rate of debt (as a percent)             5.10%     5.20%  
Subordinated Debt [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             $ 46,690,000     $ 45,877,000  
Preferred Stock [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             $ 122,971,000     $ 104,428,000  
2018-1 Notes                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Net realized loss on extinguishment of debt $ (1,300,000)                    
2023-1 Notes                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Term Debt Secuiritisation                     $ 400,000,000
Class A-2-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 2.90%                    
Total aggregate principal amount committed $ 30,000,000                    
BCC Middle Market CLO 20181 LLC | 2018-1 Notes | SOFR                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent)     0.26%                
Bain Capital Senior Loan Program, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Total aggregate principal amount committed 500,000,000                    
Weighted average interest rate of debt (as a percent)             8.50%     7.70%  
Bain Capital Senior Loan Program, LLC | M M 22 2 Credit Facility [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Maximum borrowing capacity       $ 225,000,000              
Bain Capital Senior Loan Program, LLC | M M 22 2 Credit Facility [Member] | SOFR                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent)       2.10%              
Bain Capital Senior Loan Program, LLC | M M 23 3 Credit Facility [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Maximum borrowing capacity   $ 140,000,000                  
Outstanding balance             $ 90,900,000     $ 97,900,000  
Effective interest rate             8.20%     8.20%  
Bain Capital Senior Loan Program, LLC | M M 23 3 Credit Facility [Member] | SOFR                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent)   2.85%                  
Bain Capital Senior Loan Program, LLC | Subordinated Debt [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             $ 146,500,000     $ 116,000,000  
Bain Capital Senior Loan Program, LLC | Preferred Stock [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             (1,600,000)     (1,800,000)  
Bain Capital Senior Loan Program, LLC | Common Stock [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Investments at fair value             $ (100,000)     $ 400,000  
Bain Capital Senior Loan Program, LLC | 2018-1 Notes | Membership Interests [Member]                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Total aggregate principal amount committed $ 22,400,000                    
Bain Capital Senior Loan Program, LLC | Class A-1-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 2.25%                    
Total aggregate principal amount committed $ 290,000,000                    
Bain Capital Senior Loan Program, LLC | Class A-J-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 2.70%                    
Total aggregate principal amount committed $ 20,000,000                    
Bain Capital Senior Loan Program, LLC | Class B-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 3.90%                    
Total aggregate principal amount committed $ 40,000,000                    
Bain Capital Senior Loan Program, LLC | Class C-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 5.90%                    
Total aggregate principal amount committed $ 30,000,000                    
Bain Capital Senior Loan Program, LLC | Class D-R                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Spread rate (as a percent) 8.32%                    
Total aggregate principal amount committed $ 30,000,000                    
Bain Capital Senior Loan Program, LLC | BCC Middle Market CLO 20181 LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Membership equity interest acquired         70.00% 70.00%          
Membership interests (as a percent)         30.00% 30.00%          
Proceeds from principal payments and sales of investments         $ 56,100,000            
Net realized gain from sale of investment         $ 1,200,000            
Amberstone Co., Ltd. | Bain Capital Senior Loan Program, LLC                      
Investment Company, Nonconsolidated Subsidiary [Line Items]                      
Economic ownership interest           50.00%          
Initial capital contributions           $ 179,000,000