Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Capital Expenditures Incurred but Not yet Paid	$ 52.5		$ 106.5
Capitalized interest costs	5.7	$ 4.3
Property Plant and Equipment
Total property, plant and equipment, gross	4,136.1		4,045.6
Less: accumulated depreciation	(1,427.2)		(1,391.7)
Property, plant and equipment, net, excluding tooling	2,708.9		2,653.9
Tooling, net of amortization	214.9		209.9
Property, plant and equipment, net	2,923.8		2,863.8
Land, land use rights and buildings [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	932.4		899.2
Machinery and equipment [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2,816.1		2,734.4
Capital leases [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	1.4		1.5
Construction in progress [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	$ 386.2		$ 410.5