Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Other Intangible Assets [Line Items]
Gross Carrying Amount, total other intangible assets	$ 597.9	$ 582.9
Accumulated Amortization, total other intangible assets	(447.4)	(411.0)
Net Book Value, total other intangible assets	150.5	171.9
Customer Relationships
Schedule Of Other Intangible Assets [Line Items]
Gross Carrying Amount, total other intangible assets	532.9	517.9
Accumulated Amortization, total other intangible assets	(404.8)	(370.7)
Net Book Value, total other intangible assets	128.1	147.2
Patents
Schedule Of Other Intangible Assets [Line Items]
Gross Carrying Amount, total other intangible assets	2.0	2.0
Accumulated Amortization, total other intangible assets	(2.0)	(2.0)
Trademarks, Licenses and Agreements
Schedule Of Other Intangible Assets [Line Items]
Gross Carrying Amount, total other intangible assets	26.2	26.2
Accumulated Amortization, total other intangible assets	(24.9)	(24.4)
Net Book Value, total other intangible assets	1.3	1.8
Trade Names
Schedule Of Other Intangible Assets [Line Items]
Gross Carrying Amount, total other intangible assets	36.8	36.8
Accumulated Amortization, total other intangible assets	(15.7)	(13.9)
Net Book Value, total other intangible assets	$ 21.1	$ 22.9