Stockholder's Equity (Reclassification out of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Reclassification out of Accumulated Other Comprehensive Income
Revenue	$ (3,158.5)	$ (3,434.2)	$ (6,288.8)		$ (6,347.2)
Selling, general and administrative expense	(234.9)	(323.8)	(528.8)		(621.6)
Other income (expense), net	(9.7)	(72.6)	(38.2)		(98.8)
Loss before income taxes	33.0	114.6	(3,175.0)	[1]	148.9	[1]
Provision for income taxes (Note 19)	17.7	0.9	55.4		15.4
Net income (loss)	15.3	113.7	(3,230.4)		133.5
Amount Reclassified out of Accumulated Other Comprehensive Loss
Reclassification out of Accumulated Other Comprehensive Income
Loss before income taxes	(3.3)	(1.5)	(6.4)		(1.9)
Provision for income taxes (Note 19)	(0.9)	(0.4)	(1.5)		(0.5)
Net income (loss)	(2.4)	(1.1)	(4.9)		(1.4)
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)	(0.2)	(1.5)	(0.5)	[2]	(1.9)	[2]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	3.1		5.9
Foreign exchange contracts | Cash Flow Hedging | Amount Reclassified out of Accumulated Other Comprehensive Loss | Hedging
Reclassification out of Accumulated Other Comprehensive Income
Revenue	11.3	13.2	22.4		12.5
Cost of sales	10.2	2.3	20.0		4.9
Selling, general and administrative expense	(0.4)	0.0	(0.4)		0.1
Other income (expense), net	(2.2)	1.0	(1.2)		(1.4)
Loss before income taxes	(3.7)	(9.9)	(4.0)		(8.9)
Provision for income taxes (Note 19)	0.0	(3.2)	(0.2)		(2.5)
Net income (loss)	$ (3.7)	$ (6.7)	$ (3.8)		$ (6.4)

[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.