Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 585.4	$ 560.1
Less: Accumulated depreciation	348.8	322.5
Property, plant and equipment, net	236.6	237.6
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12.7	12.1
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 87.8	84.8
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 440.1	424.0
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Property, plant and equipment, useful life, majority range	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Property, plant and equipment, useful life, majority range	10 years
Leased property under finance leases
Property, Plant and Equipment [Line Items]
Leased property under finance leases	$ 44.8	$ 39.2