Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Acquired Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,650.1	$ 1,647.3
Accumulated amortization	(560.4)	(533.1)
Finite-Lived Intangible Assets, Net	1,089.7	1,114.2
Net, indefinite-life intangibles	446.8	444.2
Cost	2,096.9	2,091.5
Net	1,536.5	1,558.4
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	1,514.9	1,513.9
Accumulated amortization	(460.5)	(437.5)
Finite-Lived Intangible Assets, Net	1,054.4	1,076.4
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	1.5	1.5
Accumulated amortization	(1.5)	(1.4)
Finite-Lived Intangible Assets, Net	0.0	0.1
Patented Technology [Member]
Acquired Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	133.7	131.9
Accumulated amortization	(98.4)	(94.2)
Finite-Lived Intangible Assets, Net	$ 35.3	$ 37.7