v3.25.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
company
Jun. 30, 2024
company
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
Jun. 30, 2025
USD ($)
company
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]            
Cash equivalents | $ $ 19.0   $ 19.0   $ 19.0 $ 6.5
Cash exceeded federal deposit insurance corporation insurance protection levels | $ $ 64.8   $ 64.8   $ 64.8 $ 67.5
Percentage of total investment income, attributable to noncash paid-in-kind interest income (as a percent) 2.30% 3.70% 2.60% 3.50%    
Percentage of total investment come, attributable to noncash cumulative dividend income (as a percent) 0.90% 0.50% 0.70% 0.40%    
Percentage of total investment income, attributable to interest income, debt investments, net (as a percent) 1.70% 2.00% 1.70% 1.90%    
Number of operating segments | segment     1      
Number of reportable segments | segment     1      
Revolving Credit Facility | Line of Credit            
Schedule of Investments [Line Items]            
Commitment fee (as a percentage)     3.40%      
Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     100.00%     100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk | Non-accrual Status            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     2.10%     0.90%
Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     100.00%     100.00%
Investment Owned, At Cost | Investment Type Concentration Risk | Non-accrual Status            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     5.00%     3.50%
LMM portfolio investments            
Schedule of Investments [Line Items]            
Consultation period subsequent to initial investment (in months)     12 months      
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company 19 18     68  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)         99.00%  
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent) 23.00% 21.00%     92.00%  
Private Loan portfolio investments            
Schedule of Investments [Line Items]            
Consultation period subsequent to initial investment (in months)     12 months      
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company 19 19     64  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)         98.00%  
Private Loan portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent) 26.00% 22.00%     91.00%  
Middle Market portfolio investments            
Schedule of Investments [Line Items]            
Percentage of portfolio investments containing limited consultation with financial advisory services firm (as a percent) 96.00%   96.00%   96.00% 97.00%
Middle Market portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     2.10%     3.10%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     3.10%     4.60%
Other Portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     2.40%     2.50%
Other Portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk (as a percent)     2.90%     2.90%