INCOME TAXES - Valuation Allowance (Details) - Valuation Allowance on Deferred Tax Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	$ 52.0	$ 39.4	$ 35.3
Additions/ (Deductions) Charged to/ (from) Income Tax Expense/ Expenses	10.5	17.8	13.3
Other Charges/(Reversals)/Changes to Reserves	(1.1)	(5.2)	(9.2)
Balance End of Period	$ 61.4	$ 52.0	$ 39.4