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FINANCIAL HIGHLIGHTS - Financial Highlights, Additional Information (Details) - $ / shares
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Investment Company, Financial Highlights [Line Items]        
Per share market value at end of period (in dollars per share) $ 20.41 $ 20.94 $ 21.89 $ 20.03
Total distributions to stockholders (in dollars per share) $ 1.44 $ 1.44    
Ratio of operating expenses to average net assets 11.47% 12.45%    
Base management fee        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 3.04% 3.03%    
Income based fee and capital gains incentive fee        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 2.43% 3.22%    
Interest and credit facility fees        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 5.63% 5.83%    
Other operating expenses        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 0.37% 0.37%