FINANCIAL INSTRUMENTS AND DERIVATIVES - GAIN (LOSS) ON AOCI - NET INVESTMENT HEDGES (Details) - Net Investment Hedging - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Gain (Loss) in AOCI	$ (17.9)	$ (1.9)
Derivative, gain (loss) recognized in income (expense)	(3.4)	0.5
Cross currency basis swaps
Derivative [Line Items]
Gain (Loss) in AOCI	(6.4)
Cross currency basis swaps | Interest Income
Derivative [Line Items]
Derivative, gain (loss) recognized in income (expense)	1.7
Cross currency basis swaps | Other Expense (Income), Net
Derivative [Line Items]
Derivative, gain (loss) recognized in income (expense)	(6.6)
Foreign exchange forward contracts
Derivative [Line Items]
Gain (Loss) in AOCI	(11.5)	(1.9)
Foreign exchange forward contracts | Other Expense (Income), Net
Derivative [Line Items]
Derivative, gain (loss) recognized in income (expense)	$ 1.5	$ 0.5