Property, Plant And Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 731.0	$ 692.9
Less: accumulated depreciation	(428.0)	(402.6)
Property, plant and equipment, net	303.0	290.3	$ 261.6
Land and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	24.8	23.7
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	182.6	166.9
Machinery, equipment and other assets
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	438.8	410.1
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 84.8	$ 92.2