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Investments - SLP (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 07, 2022
Feb. 09, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     $ 2,293,522   $ 2,289,105
Investments sold     231,900    
Proceeds from principal payments and sales of investments     731,363 $ 1,058,981  
Subordinated Debt          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     39,478   20,027
Preferred Stock [Member]          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     71,738   $ 53,991
Common Stock [Member]          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     4,100    
Bain Capital Senior Loan Program, LLC | Subordinated Debt          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     51,000    
Bain Capital Senior Loan Program, LLC | Preferred Stock [Member]          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments at fair value     (400)    
Bain Capital Senior Loan Program, LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Economic ownership interest   50.00%      
Bain Capital Senior Loan Program, LLC | M M 22 2 Credit Facility [Member]          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Maximum borrowing capacity     225,000    
Outstanding balance     $ 28,000    
Effective interest rate     4.40%    
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)     210.00%    
Bain Capital Senior Loan Program, LLC | BCC Middle Market CLO 20181 LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Membership interests (as a percent) 30.00% 30.00%      
Amberstone Co., Ltd. | Bain Capital Senior Loan Program, LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Initial capital contributions   $ 179,000      
Amberstone Co., Ltd. | Bain Capital Senior Loan Program, LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Economic ownership interest   50.00%      
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%      
Proceeds from principal payments and sales of investments $ 56,100        
Net realized gain from sale of investment $ 1,200