INCOME TAXES - Schedule of Reconciliation of Changes in Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1:	$ 127.3	$ 102.6	$ 64.7
Increases based on current year tax positions	19.9	26.6	23.8
Decreases based on current year tax positions	0.0	0.0	0.0
Increases based on prior year tax positions	6.5	10.4	18.9
Decreases based on prior year tax positions	(5.2)	(1.6)	0.0
Settlements	(2.0)	0.0	0.0
Lapse of statute of limitations	(3.7)	(9.9)	(3.8)
Cumulative translation adjustment	(1.6)	(0.8)	(1.0)
Balance at December 31:	$ 141.2	$ 127.3	$ 102.6