Stockholder's Equity (Reclassification out of Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification out of Accumulated Other Comprehensive Income
Revenue		$ 4,140.9	$ 2,375.7	$ 11,373.9	$ 7,151.9
Selling, general and administrative expense		(284.4)	(143.0)	(806.5)	(434.0)
Research and development expense		(51.1)	(22.0)	(143.6)	(67.8)
Other (expense), net		30.0	81.7	43.2	(17.5)
Income before income taxes	[1]	229.6	404.2	511.4	679.9
Provision (benefit) for income taxes		111.7	102.5	249.7	153.8
Net income		117.9	301.7	261.7	526.1
Reclassification out of Accumulated Other Comprehensive Income | Hedging | Foreign Exchange Contract
Reclassification out of Accumulated Other Comprehensive Income
Revenue		(6.3)		(31.6)
Cost of sales		0.2		1.7
Selling, general and administrative expense		0.5		0.7
Research and development expense				(0.1)
Other (expense), net		(20.4)	(18.1)	(70.6)	(107.9)
Income before income taxes		(26.0)	(18.1)	(99.9)	(107.9)
Provision (benefit) for income taxes		(6.3)	(4.3)	(25.6)	(31.5)
Net income		(19.7)	(13.8)	(74.3)	(76.4)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial gain (loss)
Reclassification out of Accumulated Other Comprehensive Income
Amortization of actuarial gain (loss)	[2]	(0.7)	(0.2)	(1.9)	(0.7)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit (cost)
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service credit (cost)	[2]	(0.3)	(0.2)	(0.6)	(0.6)
Reclassification out of Accumulated Other Comprehensive Income | Defined Pension and Other Post-retirement Benefits
Reclassification out of Accumulated Other Comprehensive Income
Income before income taxes		(1.0)	(0.4)	(2.5)	(1.3)
Provision (benefit) for income taxes		(0.3)	(0.1)	(0.7)	(0.4)
Net income		$ (0.7)	$ (0.3)	$ (1.8)	$ (0.9)

[1] Includes amounts attributable to noncontrolling interests.

[2] (a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 15 for additional details).