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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]  
Schedule of Investment Income
A presentation of total investment income MSC Income earned from its Investment Portfolio in each of the periods presented is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2025202420252024
(dollars in thousands)
Interest, dividend and fee income:
Interest income$30,117 $30,236 $86,890 $88,154 
Dividend income3,652 2,485 13,750 8,964 
Fee income1,598 756 3,597 4,255 
Total investment income$35,367 $33,477 $104,237 $101,373