DERIVATIVE FINANCIAL INSTRUMENTS (Location of gain (loss) recognized in income related to hedges and derivatives) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Total revenue	$ 1,632.0	$ 1,582.6
Selling, General and Administrative Expense	(147.6)	(195.3)
Other income (expense), net	35.6	(7.9)
Foreign exchange contracts | Revenue
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0.2	0.0
Total gain (loss) recognized in income associated with hedges and derivatives	(9.2)	(9.9)
Foreign exchange contracts | Cost of sales
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0.5	0.0
Total gain (loss) recognized in income associated with hedges and derivatives	7.6	7.6
Foreign exchange contracts | Selling, general and administrative expense
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0.0	0.0
Total gain (loss) recognized in income associated with hedges and derivatives	1.0	0.0
Foreign exchange contracts | Other income (expense), net
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(11.4)	0.0
Total gain (loss) recognized in income associated with hedges and derivatives	(8.0)	(12.1)
Foreign exchange contracts | Cash Flow Hedging | Revenue
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	1.0	1.2
Total cash flow hedge gain (loss) recognized in income	(9.4)	(9.9)
Total hedge gain (loss) recognized in income	(9.4)	(9.9)
Foreign exchange contracts | Cash Flow Hedging | Cost of sales
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	(1.2)	(2.2)
Total cash flow hedge gain (loss) recognized in income	7.1	7.6
Total hedge gain (loss) recognized in income	7.1	7.6
Foreign exchange contracts | Cash Flow Hedging | Selling, general and administrative expense
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	0.9	0.0
Total cash flow hedge gain (loss) recognized in income	1.0	0.0
Total hedge gain (loss) recognized in income	1.0	0.0
Foreign exchange contracts | Cash Flow Hedging | Other income (expense), net
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	(0.6)	(12.6)
Total cash flow hedge gain (loss) recognized in income	3.4	(12.1)
Total hedge gain (loss) recognized in income	3.4	(12.1)
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Total revenue	(10.4)	(11.1)
Cost of Revenue	8.3	9.8
Selling, General and Administrative Expense	0.1	0.0
Other income (expense), net	4.0	1.0
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging | Revenue
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Total revenue	(10.4)	(11.1)
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging | Cost of sales
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Cost of Revenue	8.3	9.8
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging | Selling, general and administrative expense
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Selling, General and Administrative Expense	0.1	0.0
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging | Other income (expense), net
Location of gain (loss) recognized in income related to hedges and derivatives [Line Items]
Other income (expense), net	$ 4.0	$ 0.5