Stockholder's Equity (Reclassification out of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Reclassification out of Accumulated Other Comprehensive Income
Revenue	$ (3,335.7)	$ (3,335.1)	$ (9,624.5)		$ (9,682.3)
Selling, general and administrative expense	(252.0)	(298.1)	(780.8)		(919.7)
Other income (expense), net	28.9	(57.7)	(9.3)		(156.5)
Loss before income taxes	28.9	(34.2)	(3,146.1)	[1]	114.7	[1]
Provision for income taxes (Note 19)	22.5	81.1	77.9		96.5
Net income (loss)	6.4	(115.3)	(3,224.0)		18.2
Amount Reclassified out of Accumulated Other Comprehensive Loss
Reclassification out of Accumulated Other Comprehensive Income
Loss before income taxes	(0.9)	(1.0)	(7.3)		(2.7)
Provision for income taxes (Note 19)	1.7	(0.1)	0.2		(0.4)
Net income (loss)	(2.6)	(0.9)	(7.5)		(2.3)
Amount Reclassified out of Accumulated Other Comprehensive Loss | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service credit (cost)	(0.3)	(1.0)	(0.8)	[2]	(2.7)	[2]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	0.6		6.5
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging
Reclassification out of Accumulated Other Comprehensive Income
Revenue	23.8	3.1	57.3		15.6
Cost of sales	18.3	1.6	48.0		6.5
Selling, general and administrative expense		0.0	(0.4)		0.1
Other income (expense), net	(2.0)	23.3	(3.2)		21.9
Loss before income taxes	(7.5)	21.8	(12.9)		12.9
Provision for income taxes (Note 19)	(3.6)	4.7	(4.2)		2.2
Net income (loss)	$ (3.9)	$ 17.1	$ (8.7)		$ 10.7

[1] Includes amounts attributable to non-controlling interests.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost.