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Property, Plant, and Equipment, Net - Schedule of Property, Plant, and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 482.9 $ 447.8
Accumulated depreciation (346.5) (319.5)
Property, plant, and equipment, net 136.4 128.3
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 7.5 7.5
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 306.3 265.0
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 120.2 116.1
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 48.9 $ 59.2