v3.26.1
Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 16, 2021
Jun. 15, 2019
Jun. 14, 2019
Mar. 31, 2026
Mar. 31, 2025
Related Party Transaction [Line Items]          
Asset coverage per ratio (as percent)       172.00% 182.00%
Investment Advisory Agreement | FS/KKR Advisor, LLC          
Related Party Transaction [Line Items]          
Management and service fees, base rate 1.50% 1.00% 1.50%    
Asset coverage per ratio (as percent)   150.00% 200.00%    
Affiliated Purchaser Program | FS/KKR Advisor, LLC          
Related Party Transaction [Line Items]          
Commitment to investment vehicle       $ 100  
Investment vehicle       $ 350