DEBT - Schedule of Debt Discount and Premium (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Original Issuance Discount And Premium [Roll Forward]
Beginning balance	$ (47.8)	$ 9.3
New Original Issuance Discount		(13.3)
Debt Instrument, Fees Paid To Lenders		(54.6)
Amortization	7.0	3.5	$ 0.4
Loss on debt extinguishment		7.3
Ending balance	(40.8)	(47.8)	9.3
US Term loan
Original Issuance Discount And Premium [Roll Forward]
Beginning balance	(39.8)	(6.5)
New Original Issuance Discount		(8.9)
Debt Instrument, Fees Paid To Lenders		(35.2)
Amortization	5.6	3.5
Loss on debt extinguishment		7.3
Ending balance	(34.2)	(39.8)	(6.5)
EMEA Term loan
Original Issuance Discount And Premium [Roll Forward]
Beginning balance	(22.0)	0.0
New Original Issuance Discount		(4.4)
Debt Instrument, Fees Paid To Lenders		(19.4)
Amortization	3.3	1.8
Loss on debt extinguishment		0.0
Ending balance	(18.7)	(22.0)	0.0
Senior notes offering, December 2024
Original Issuance Discount And Premium [Roll Forward]
Beginning balance	14.0	15.8
New Original Issuance Discount		0.0
Debt Instrument, Fees Paid To Lenders		0.0
Amortization	(1.9)	(1.8)
Loss on debt extinguishment		0.0
Ending balance	$ 12.1	$ 14.0	$ 15.8