BUSINESS COMBINATIONS - Schedule of Unaudited Pro Forma Net Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Increase in intangible amortization expense	$ (23.9)	$ (23.9)	$ (20.7)
Decrease in income tax expense	$ (12.3)	(16.8)	$ (12.4)
Acquisition-related Costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Increase in intangible amortization expense		(0.7)
Exclusion of buyer transaction costs		0.7
Decrease in income tax expense		$ 0.2