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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Excise and sales taxes $ 0.2 $ 0.4  
Cost of investments, income tax purposes 2,551.1 2,551.1 $ 2,565.9
Gross unrealized appreciation (depreciation) (21.6) (21.6) (105.8)
Unrealized gross appreciation 131.6 131.6 112.4
Unrealized gross depreciation 153.2 153.2 218.3
Deferred tax asset 9.0 9.0 9.5
Deferred tax assets, valuation allowance $ 7.8 $ 7.8 $ 8.3