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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 327.2 $ 251.8
Less accumulated depreciation (131.2) (94.4)
Property, plant and equipment, Net 196.0 157.4
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 17.7 7.2
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 44.0 37.8
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 249.4 192.6
Work in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 16.1 $ 14.2