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Supplemental Balance Sheet Information - 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 $ 291.9   $ 289.4
Less accumulated depreciation (118.5)   (114.1)
Total 173.4   175.3
Depreciation expense 5.5 $ 5.8  
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 1.1   1.1
Buildings      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 46.7   46.8
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 219.6   218.2
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 24.5   $ 23.3