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, 2015	Mar. 31, 2014
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	$ (7.9)	$ 2.4
Net Gain/(Loss) Reclassified from AOCI to Net Income	(2.1)	0.6
Interest Rate Option Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	3.2
Net Gain/(Loss) Reclassified from AOCI to Net Income	1.1
Net Gain/(Loss) Reclassified from AOCI to Net Income | Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Operating Income	(1.6)	0.8
Other Operating Expense	(0.5)	(0.2)
Net Gain/(Loss) Reclassified from AOCI to Net Income | Interest Rate Option Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 1.1