Derivative Financial Instruments (Derivative Instruments In Cash Flow Hedging Relationships Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss)
Revenue	$ 2,960.9	$ 3,845.0	$ 6,086.1	$ 7,233.0
Selling, general and administrative expense	(281.4)	(268.0)	(584.5)	(522.1)
Research and development expense	(53.6)	(49.1)	(94.7)	(92.5)
Other income (expense), net	2.2	(50.3)	(23.0)	13.2
Income before income taxes	174.8	245.2	315.5	281.8
Foreign exchange contracts
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income on Derivatives (Instruments Not Designated as Hedging Instruments)	10.7	(0.9)	(2.3)	31.6
Foreign exchange contracts \| Revenue
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income on Derivatives (Instruments Not Designated as Hedging Instruments)	(1.2)	(0.3)	(0.9)
Foreign exchange contracts \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income on Derivatives (Instruments Not Designated as Hedging Instruments)	0.1		0.2	(0.5)
Foreign exchange contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income on Derivatives (Instruments Not Designated as Hedging Instruments)	11.8	(0.6)	(1.6)	32.1
Cash Flow Hedging \| Foreign exchange contracts
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0.1	15.8	2.0	13.5
Cash Flow Hedging \| Foreign exchange contracts \| Revenue
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0.3	2.4	0.8	4.2
Cash Flow Hedging \| Foreign exchange contracts \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(0.9)	(3.4)	(2.0)	(4.5)
Cash Flow Hedging \| Foreign exchange contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0.7	16.8	3.2	13.8
Amount Reclassified out of Accumulated Other Comprehensive Loss
Derivative Instruments, Gain (Loss)
Income before income taxes	(0.3)	(0.8)	(0.3)	(1.5)
Accumulated net gain (loss) from cash flow hedges \| Amount Reclassified out of Accumulated Other Comprehensive Loss \| Cash Flow Hedging \| Foreign exchange contracts
Derivative Instruments, Gain (Loss)
Revenue	1.1	(10.7)	3.6	(25.4)
Cost of sales	3.5	1.6	5.1	1.5
Selling, general and administrative expense	(0.1)	0.2		0.2
Research and development expense				(0.1)
Other income (expense), net	(0.1)	(21.8)	(4.7)	(50.2)
Income before income taxes	$ 4.4	$ (30.7)	$ 4.0	$ (74.0)

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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