Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 308.8	$ 345.5
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	299.9	310.4
Accumulated amortization	(107.0)	(98.1)
Acquired intangible assets, net	192.9	212.3
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	29.9	30.6
Accumulated amortization	(22.5)	(20.9)
Acquired intangible assets, net	7.4	9.7
Computer Software Intangible Asset [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	75.7	79.8
Accumulated amortization	(46.3)	(43.0)
Acquired intangible assets, net	29.4	36.8
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	73.8	76.5
Accumulated amortization	(15.6)	(13.3)
Acquired intangible assets, net	58.2	63.2
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	44.0	44.8
Accumulated amortization	(23.1)	(21.3)
Acquired intangible assets, net	$ 20.9	$ 23.5