Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and the Amounts Reclassified to Earnings (Detail) (Asset And Liability Management, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	$ (9.2)	$ 18.9
Other Operating Income	(0.7)	(1.5)
Other Operating Expense	(1.1)	2.3
Net Gain/(Loss) Reclassified from AOCI to Earnings	(1.8)	0.8
Interest Rate Swap Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income		0.2
Net Gain/(Loss) Reclassified from AOCI to Earnings		$ 0.2