COMPREHENSIVE INCOME - SUMMARY OF COMPREHENSIVE INCOME, NET OF TAX (Details) - Foreign Currency Translation Gain (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]
Foreign currency translation gains	$ 248.2	$ 91.4	$ 304.8	$ 107.2
Foreign currency tax adjustment	192.8		192.8		$ 166.4
Net Investment Hedging
Condensed Statement of Income Captions [Line Items]
Foreign currency translation losses	$ (24.2)	$ (1.6)	$ (33.6)	$ (13.3)