ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of Total Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,816.4	$ 2,747.9	$ 1,917.2
Ending Balance	2,908.6	2,816.4	2,747.9
Currency Translation (Loss) Income Adjustments
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(362.3)	(276.0)	(135.2)
Period change	79.3	(86.3)	(140.8)
Ending Balance	(283.0)	(362.3)	(276.0)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(5.3)	(6.6)	(3.2)
Period change	1.3	1.3	(3.4)
Ending Balance	(4.0)	(5.3)	(6.6)
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(367.6)	(282.6)	(138.4)
Period change	80.6	(85.0)	(144.2)
Ending Balance	$ (287.0)	$ (367.6)	$ (282.6)