Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments (Detail) - Nondesignated [Member] - Other Nonoperating Income Expense [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (1.1)	$ (4.8)	$ (8.3)	$ (3.9)
Foreign Exchange Forward [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	0.6	$ (4.8)	(1.3)	$ (3.9)
Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (1.7)		$ (7.0)