Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on Gross Basis (Detail) (Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 114.5	$ 84.0
Derivative Liabilities	25.6	32.5
Foreign exchange forward contracts [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	53.0	29.7
Foreign exchange forward contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	30.8	19.8
Foreign exchange forward contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	17.8	20.2
Foreign exchange forward contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	7.8	12.3
Foreign exchange options [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.1	0.6
Interest rate swaps [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 30.6	$ 33.9