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INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unrecognized Tax Benefits      
Unrecognized tax benefits at the beginning of period $ 43.9 $ 32.1 $ 37.6
Gross increases - current year tax positions 0.8 12.9 1.4
Gross increases - prior year tax positions 3.6 1.6 1.1
Gross decreases - prior year tax positions (0.2) (2.0) (2.8)
Gross decreases - settlements 0.0 (0.7) (5.1)
Gross decreases - statute lapse 0.0 0.0 (0.1)
Unrecognized tax benefits at end of year 48.1 43.9 32.1
Interest and penalties in year-end balance $ 6.4 $ 4.1 $ 3.3