Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 319.2	$ 299.1
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	315.0	298.4
Accumulated amortization	(118.2)	(110.0)
Acquired intangible assets, net	196.8	188.4
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	30.0	29.7
Accumulated amortization	(24.4)	(23.1)
Acquired intangible assets, net	5.6	6.6
Computer Software Intangible Asset [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	91.8	74.7
Accumulated amortization	(52.9)	(47.7)
Acquired intangible assets, net	38.9	27.0
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	76.3	72.4
Accumulated amortization	(17.8)	(16.2)
Acquired intangible assets, net	58.5	56.2
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	43.9	44.3
Accumulated amortization	(24.5)	(23.4)
Acquired intangible assets, net	$ 19.4	$ 20.9