INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Net tax expense recorded			$ 4.3
Provisional expense for U.S. tax reform bill			55.0
Net benefit for revaluation of deferred tax assets and liabilities			50.7
Net tax expense (benefit) related to Tax Act		$ (5.1)	27.2
Tax benefit related to French Finance Act			22.9
Provisional expense (benefit) for net deferred taxes			(24.6)
Provisional transition tax expense (benefit)		(14.4)	51.8
Valuation allowance	$ 58.0	41.7
Net operating loss carry-forwards	390.5
Unrecognized tax benefits	17.2	9.5	$ 6.9	$ 8.4
Unrecognized tax benefits if recognized that would affect effective tax rate	17.2	8.4
Accrued interest	4.0	0.9
Unrecognized tax benefits subject to change within the next 12 months	7.6
Global Intangible Low Taxed Income
Operating Loss Carryforwards [Line Items]
Provisional expense (benefit) for net deferred taxes	$ 11.9	$ 9.3