Acquired Intangible Assets and Related Amortization (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 212.7	$ 226.5
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	214.2	219.6
Accumulated amortization	(76.6)	(74.0)
Acquired intangible assets, net	137.6	145.6
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	31.3	31.4
Accumulated amortization	(16.6)	(16.0)
Acquired intangible assets, net	14.7	15.4
Software [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	67.4	73.2
Accumulated amortization	(31.5)	(33.7)
Acquired intangible assets, net	35.9	39.5
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	28.0	28.3
Accumulated amortization	(10.6)	(10.3)
Acquired intangible assets, net	17.4	18.0
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	24.3	24.9
Accumulated amortization	(17.2)	(16.9)
Acquired intangible assets, net	$ 7.1	$ 8.0