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Investment Portfolio - Narrative (Details)
$ in Millions
 12 Months Ended
Jun. 18, 2021
Dec. 31, 2025
USD ($)
company
Dec. 31, 2024
USD ($)
company
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]        
Amount funded to joint venture   $ 2,520.0    
Net realized gain (loss) on investments:   (339.0) $ (486.0) $ (343.0)
Receivable for investments sold and repaid   313.0 186.0  
Credit Opportunities Partners JV, LLC        
Schedule of Investments [Line Items]        
Aggregate credit opportunities partners   2,800.0    
Cost basis of investments sold   1,805.4    
Proceeds from sale of investments   1,829.2    
Net realized gain (loss) on investments:   23.8    
Receivable for investments sold and repaid   242.4    
Credit opportunities partners JV, LLC, entitled to a fee percentage 0.25%      
Administrative services   $ 11.1 9.3  
FS KKR Capital Corp.        
Schedule of Investments [Line Items]        
Contributed capital to committed capital ratio (as percent)   87.50%    
Joint venture voting control, percentage   50.00%    
Amount funded to joint venture   $ 2,205.0    
SCRS        
Schedule of Investments [Line Items]        
Contributed capital to committed capital ratio (as percent)   12.50%    
Joint venture voting control, percentage   50.00%    
Unfunded Dent Securities        
Schedule of Investments [Line Items]        
Unfunded commitments   $ 1,447.4 1,534.1  
Unfunded Equity/Other Commitments        
Schedule of Investments [Line Items]        
Unfunded commitments   87.5 387.1  
Partnership Interest        
Schedule of Investments [Line Items]        
Unfunded commitments   $ 245.0 $ 735.2  
Controlled/affiliated        
Schedule of Investments [Line Items]        
Number of investments in portfolio companies | company   34 31  
Net realized gain (loss) on investments:   $ (73.7) $ 23.2 (175.0)
Non-controlled/affiliated        
Schedule of Investments [Line Items]        
Number of investments in portfolio companies | company   10 11  
Net realized gain (loss) on investments:   $ (2.3) $ (60.7) $ (21.0)