Property, Plant and Equipment (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				$ 798.2	$ 783.3
Less accumulated depreciation and amortization				494.1	418.8
Total property plant and equipment, net				304.1	364.5	$ 387.0
Depreciation				105.3	92.9	61.8
Impairment of assets		$ 134.4	$ 83.1	217.5	3.1	$ 9.8
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	[1]			15.6	16.0
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				122.2	112.9
Machinery, tools and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				99.6	108.2
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	[2]			26.9	28.3
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				174.5	153.8
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				142.9	146.6
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				70.3	73.4
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				140.9	136.4
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost				$ 5.3	$ 7.7
Maximum | Land and land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P15Y
Maximum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P30Y
Maximum | Machinery, tools and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P12Y
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)	[2]			P10Y
Maximum | Computer equipment
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P3Y
Maximum | Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P10Y
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P8Y
Maximum | Tooling
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P5Y
Minimum | Land and land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P0Y
Minimum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P15Y
Minimum | Machinery, tools and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P5Y
Minimum | Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P5Y
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P5Y
Minimum | Tooling
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum (years)				P3Y

[1] Estimated useful life for land and land improvements is perpetual and 15 years, respectively.

[2] The estimated useful life for leasehold improvements is the lesser of 10 years or the term of the lease.