Fair Value of Derivative Instruments on Gross Basis (Detail) (Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 64.9	$ 69.6
Derivative Liabilities	44.1	56.9
Foreign exchange forward contracts [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	20.6	24.9
Foreign exchange forward contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	8.1	14.5
Foreign exchange forward contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	31.1	35.6
Foreign exchange forward contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	13.0	13.1
Foreign exchange options [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.6	1.4
Foreign exchange options [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		1.0
Interest rate swaps [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	35.6	27.8
Cross-currency interest rate swaps [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities		$ 8.2