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Derivative Financial Instruments (Derivative Instruments In Cash Flow Hedging Relationships Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 3,726.8	$ 3,335.1	$ 3,434.2	$ 2,913.0	$ 3,323.0	$ 3,143.8	$ 2,960.9	$ 3,125.2	$ 13,409.1	$ 12,552.9	$ 15,056.9
Selling, general and administrative expense									1,228.1	1,140.6	1,060.9
Other income (expense), net									(220.7)	(323.9)	(25.9)
Foreign exchange contract \| Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivatives (instruments not designated as hedging instruments)									(1.6)	(1.7)	0.9
Foreign exchange contract \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivatives (instruments not designated as hedging instruments)									0.2	0.2	(0.3)
Foreign exchange contract \| Selling, general and administrative expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivatives (instruments not designated as hedging instruments)									0.0	0.0	0.0
Foreign exchange contract \| Other (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivatives (instruments not designated as hedging instruments)									(10.2)	(11.4)	43.0
Reclassification out of Accumulated Other Comprehensive Income \| Cash flow hedging \| Foreign exchange contract \| Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated OCI into incom									(26.6)	(2.4)	(39.3)
Reclassification out of Accumulated Other Comprehensive Income \| Cash flow hedging \| Foreign exchange contract \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated OCI into incom									(12.0)	(3.4)	(5.3)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] \| Reclassification out of Accumulated Other Comprehensive Income \| Cash flow hedging \| Foreign exchange contract
Derivative Instruments, Gain (Loss) [Line Items]
Revenues									(26.6)	(2.4)	(39.3)
Cost of Revenue									(12.0)	(3.4)	(5.3)
Selling, general and administrative expense									0.0	0.1	(0.8)
Other income (expense), net									$ (9.1)	$ 1.0	$ (102.2)