Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments and on Interest Rate Swaps Designated as Fair Value Hedge (Detail) (Nondesignated [Member], Fair Value Hedge [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Swap [Member] | Interest Income Expense Net [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ 7.8	$ 1.0	$ 8.3	$ 3.1
Foreign Exchange Forward [Member] | Other Nonoperating Income Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (4.8)	$ 2.1	$ (3.9)	$ 2.0