Balance Sheet Components (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,890.5	$ 4,002.2
Accumulated depreciation	1,770.9	1,663.1
Property, plant and equipment, net	2,119.6	2,339.1
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,365.2	2,414.5
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,170.4	1,191.7
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	221.1	252.9
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 133.8	$ 143.1