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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Income Tax Disclosure [Abstract]      
Excise and sales taxes $ 0.4 $ 0.3  
Cost of investments, income tax purposes 2,618.0   $ 2,550.7
Unrealized appreciation (depreciation) (22.4)   (50.5)
Unrealized gross appreciation 132.3   124.0
Unrealized gross depreciation 154.7   174.5
Net deferred tax asset 10.0   11.0
Net deferred tax assets, valuation allowance $ 11.2   $ 11.2