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Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment $ 384.6 $ 361.5 $ 308.0
Accumulated depreciation (284.0) (259.5) (223.5)
Property, plant, and equipment, net 100.6 102.0 84.5
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment 7.5 7.5 7.5
Software [Member]      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment 218.5 197.4 162.1
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment 118.8 120.3 102.4
Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment $ 39.8 $ 36.3 $ 36.0