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], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (9.4)	$ (0.4)
Foreign Exchange Forward [Member] | Other Nonoperating Income Expense 1[Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	(4.4)	(0.4)
cross-currency swap | Other Nonoperating Income Expense 1[Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (5.0)	$ 0