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Related Party Transactions - Fees And Expenses Accrued Under The Investment Advisory Agreement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Base Management Fee $ 206.0 $ 216.0 $ 226.0
Subordinated Incentive Fee on Income [1] 136.0 167.0 181.0
Administrative Services Expenses 4.0 4.0 4.0
Management and investment adviser fees payable 50.0 53.0  
Subordinated income incentive fees payable [2] 28.0 35.0  
FS/KKR Advisor, LLC      
Related Party Transaction [Line Items]      
Base Management Fee 206.0 216.0 226.0
Subordinated Incentive Fee on Income 136.0 167.0 181.0
Administrative Services Expenses 10.0 10.0 12.0
Base management fees 209.0 219.0 229.0
Management and investment adviser fees payable 50.0    
Incentive fee paid 143.0 173.0 167.0
Subordinated income incentive fees payable 28.0    
Allocation of costs of administrative personnel for services rendered 8.0 9.0 11.0
Broken deal cost 0.9    
Payment for administrative services expenses $ 12.0 $ 12.0 $ 13.0
[1] See Note 2 and 4 for a discussion of the methodology employed by the Company in calculating the subordinated income incentive fees.
[2] See Note 2 and 4 for a discussion of the methodology employed by the Company in calculating the subordinated income incentive fees.