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Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Land $ 7.5 $ 7.5
Software 209.5 197.4
Machinery and equipment 119.2 120.3
Buildings and improvements 38.9 36.3
Total property, plant, and equipment 375.1 361.5
Accumulated depreciation (275.0) (259.5)
Property, plant, and equipment, net $ 100.1 $ 102.0