Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property Plant and Equipment
Total property, plant and equipment, gross	$ 4,023.5		$ 4,045.6
Less: accumulated depreciation	(1,406.9)		(1,391.7)
Property, plant and equipment, net, excluding tooling	2,616.6		2,653.9
Tooling, net of amortization	209.1		209.9
Property, plant and equipment, net	2,825.7		2,863.8
Capital Expenditures Incurred but Not yet Paid	62.1		106.5
Capitalized interest costs	11.1	$ 9.2
Land, land use rights and buildings [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	892.1		899.2
Machinery and equipment [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2,767.8		2,734.4
Capital leases [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	1.3		1.5
Construction in progress [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	$ 362.3		$ 410.5