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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

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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