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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 403.3 $ 395.9
Less accumulated depreciation (206.9) (199.9)
Property, plant and equipment, Net 196.4 196.0
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 18.6 17.7
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 57.0 51.0
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 311.7 311.1
Work in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 16.0 $ 16.1