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Investments - SLP Schedule of Investments (Parenthetical) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Open Forward Foreign Currency Contract [Line Items]        
Equity, Including Portion Attributable to Noncontrolling Interest $ 1,136,466 $ 1,116,391 $ 1,100,006 $ 1,068,004
Interest Rate Floor One        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 1.00% 1.00%    
Interest Rate Floor Two        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.75% 0.75%    
Interest Rate Floor Three        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.50% 0.50%    
Interest Rate Floor Four        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.00% 0.00%    
Interest Rate Floor Five        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.25% 0.25%    
Bain Capital Senior Loan Program, LLC        
Open Forward Foreign Currency Contract [Line Items]        
Equity, Including Portion Attributable to Noncontrolling Interest $ 15,269 $ 23,042    
Bain Capital Senior Loan Program, LLC | Interest Rate Floor One        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 1.00% 1.00%    
Bain Capital Senior Loan Program, LLC | Interest Rate Floor Two        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.75% 0.75%    
Bain Capital Senior Loan Program, LLC | Interest Rate Floor Three        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.50% 0.50%    
Bain Capital Senior Loan Program, LLC | Interest Rate Floor Four        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 0.00% 0.00%    
Bain Capital Senior Loan Program, LLC | Interest Rate Floor Five        
Open Forward Foreign Currency Contract [Line Items]        
Investment interest floor rate 1.50% 1.50%