ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Total Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 2,908.6	$ 2,816.4	$ 2,747.9
Ending Balance	2,597.1	2,908.6	2,816.4
Currency Translation (Loss) Income Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(283.0)	(362.3)	(276.0)
Period change	(79.3)	79.3	(86.3)
Ending Balance	(362.3)	(283.0)	(362.3)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4.0)	(5.3)	(6.6)
Period change	1.0	1.3	1.3
Ending Balance	(3.0)	(4.0)	(5.3)
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(287.0)	(367.6)	(282.6)
Period change	(78.3)	80.6	(85.0)
Ending Balance	$ (365.3)	$ (287.0)	$ (367.6)