Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 26, 2015	Dec. 31, 2014
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 3,010.6	$ 2,031.1
Accumulated amortization	(495.0)	(423.0)
Net	2,515.6	1,608.1
Net, indefinite-life intangibles	782.1	525.6
Finite-life intangibles
Acquired Intangible Assets By Major Class [Line Items]
Cost	2,228.5	1,505.5
Accumulated amortization	(495.0)	(423.0)
Net	1,733.5	1,082.5
Finite-life intangibles | Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,976.4	1,247.8
Accumulated amortization	(384.3)	(325.2)
Net	1,592.1	922.6
Finite-life intangibles | Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Cost	1.8	2.0
Accumulated amortization	(1.2)	(1.1)
Net	0.6	0.9
Finite-life intangibles | Proprietary technology
Acquired Intangible Assets By Major Class [Line Items]
Cost	250.3	255.7
Accumulated amortization	(109.5)	(96.7)
Net	$ 140.8	$ 159.0