Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,163.0		$ 4,188.2
Less: accumulated depreciation	(3,312.3)		(3,304.0)
Property, plant and equipment—net	850.7		884.2
Tangible asset impairment charges	0.8	$ 2.5
Depreciation expense	32.8	$ 37.5
Current assets of discontinued operations	6.3		4.9
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	91.0		97.6
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	773.9		780.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,076.2		3,094.1
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	184.8		183.2
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 37.1		$ 33.0