Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 299.1	$ 345.5
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	298.4	310.4
Accumulated amortization	(110.0)	(98.1)
Acquired intangible assets, net	188.4	212.3
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	29.7	30.6
Accumulated amortization	(23.1)	(20.9)
Acquired intangible assets, net	6.6	9.7
Software [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	74.7	79.8
Accumulated amortization	(47.7)	(43.0)
Acquired intangible assets, net	27.0	36.8
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	72.4	76.5
Accumulated amortization	(16.2)	(13.3)
Acquired intangible assets, net	56.2	63.2
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	44.3	44.8
Accumulated amortization	(23.4)	(21.3)
Acquired intangible assets, net	$ 20.9	$ 23.5