Goodwill and Other Intangible Assets, Net - Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 234.1	$ 217.3
Accumulated amortization	(105.4)	(83.7)
Finite-live intangible asset, net	128.7	133.6
Indefinite-lived intangible assets, gross/net carrying amount	27.5	26.7
Other intangible assets	261.6	244.0
Other intangible assets, net	156.2	160.3
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	166.2	155.8
Accumulated amortization	(74.4)	(59.3)
Finite-live intangible asset, net	$ 91.8	96.5
Finite-Lived Intangible Asset, Useful Life	12 years 3 months 18 days
Proprietary technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 54.4	52.5
Accumulated amortization	(21.8)	(16.8)
Finite-live intangible asset, net	$ 32.6	35.7
Finite-Lived Intangible Asset, Useful Life	13 years 2 months 12 days
Patents and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 13.5	9.0
Accumulated amortization	(9.2)	(7.6)
Finite-live intangible asset, net	$ 4.3	$ 1.4
Finite-Lived Intangible Asset, Useful Life	11 years 3 months 18 days