Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 329.2	$ 299.1
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	316.2	298.4
Accumulated amortization	(114.8)	(110.0)
Acquired intangible assets, net	201.4	188.4
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	30.1	29.7
Accumulated amortization	(23.8)	(23.1)
Acquired intangible assets, net	6.3	6.6
Computer Software Intangible Asset [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	93.6	74.7
Accumulated amortization	(51.4)	(47.7)
Acquired intangible assets, net	42.2	27.0
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	76.4	72.4
Accumulated amortization	(17.1)	(16.2)
Acquired intangible assets, net	59.3	56.2
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	44.2	44.3
Accumulated amortization	(24.2)	(23.4)
Acquired intangible assets, net	$ 20.0	$ 20.9