Balance Sheet Components (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,983.0	$ 4,002.2
Accumulated depreciation	1,707.8	1,663.1
Property, plant and equipment, net	2,275.2	2,339.1
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,423.5	2,414.5
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,186.4	1,191.7
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	229.0	252.9
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 144.1	$ 143.1