Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	$ 41.7	[1]	$ 29.3	[1]
Derivatives liabilities	(28.5)	[1]	(23.5)	[1]
Contingent consideration	(39.7)		(32.6)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	41.7		29.3
Derivatives liabilities	(28.5)		(23.5)
Available-for-sale securities			1.5
Contingent consideration	(39.7)		(32.6)
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	41.7		29.3
Derivatives liabilities	(28.5)		(23.5)
Available-for-sale securities			1.5
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (39.7)		$ (32.6)

[1] Consolidated balance sheet location: Asset: Other current and non-current assets Liability: Other current and non-current liabilities