Acquired Intangible Assets and Related Amortization (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 349.8	$ 221.6
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	311.1	237.4
Accumulated amortization	(95.5)	(86.6)
Acquired intangible assets, net	215.6	150.8
Trade Secrets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	30.8	31.1
Accumulated amortization	(20.2)	(18.5)
Acquired intangible assets, net	10.6	12.6
Computer Software Intangible Asset [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	80.1	71.0
Accumulated amortization	(42.4)	(38.8)
Acquired intangible assets, net	37.7	32.2
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	76.6	31.3
Accumulated amortization	(12.8)	(11.7)
Acquired intangible assets, net	63.8	19.6
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	43.0	26.1
Accumulated amortization	(20.9)	(19.7)
Acquired intangible assets, net	$ 22.1	$ 6.4