v3.26.1
Related Party Transactions - Narrative (Details)
6 Months Ended
Jun. 29, 2026
USD ($)
member
day
year
$ / shares
shares
May 10, 2026
USD ($)
Jun. 16, 2021
Jun. 15, 2019
Jun. 14, 2019
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Related Party Transaction [Line Items]              
Asset coverage per ratio (as percent)           179.00%  
Borrowings outstanding | $           $ 6,471,000,000 $ 7,634,000,000
Convertible Preferred Stock              
Related Party Transaction [Line Items]              
Sale of stock (in shares) | shares 6,000,000            
Percent of liquidation preference per share payable in cash           5.00%  
Percent of liquidation preference per share payable in shares           7.00%  
Dividend rate annual increase           1.00%  
KKR Alternative Assets L.P.              
Related Party Transaction [Line Items]              
Issuance of preferred stock | $   $ 150,000,000.0          
Temporary equity, par or stated value (in dollars per share) | $ / shares $ 0.001            
Temporary equity (in dollars per share) | $ / shares $ 25.00            
Percent of liquidation preference per share payable in cash 5.00%            
Percent of liquidation preference per share payable in shares 7.00%            
Additional shares greater than preferred stock, percent 10.00%            
Anniversary of issuance date that dividend rate will increase 5 years 6 months         5 years 6 months  
Dividend rate annual increase 1.00%            
Period until convertible 6 months            
Conversion price (in dollars per share) | $ / shares $ 18.83            
Period until shares are eligible to redeem at redemption price 3 years            
Number of trading days that the VWAP exceeds conversion price | day 30            
Issuer option, period to redeem all outstanding shares 6 years            
Issuer option, notification period 90 days            
Temporary equity option 60 days            
Period following issuance that restricts selling, pledging, transfer, and disposal of shares 1 year            
Number of board members a shareholder of convertible preferred stock has a right to elect | member 2            
Beneficial ownership percentage 50.00%            
Number of years that accumulated dividends equals dividends due and unpaid | year 2            
Number of trading days | day 5            
Temporary equity registration rights agreement number of demand requests period 365 days            
KKR Alternative Assets L.P. | Convertible Preferred Stock              
Related Party Transaction [Line Items]              
Sale of stock (in dollars per share) | $ / shares $ 25.00            
Tender offer amount | $ $ 150,000,000.0            
FS/KKR Advisor, LLC              
Related Party Transaction [Line Items]              
Incentive fee waived, percent of the subordinated incentive fee that would otherwise be paid by the company 50.00%            
Borrowings outstanding | $           $ 0  
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%