Derivatives - Schedule of Pre-Tax (Gains) Losses Related to Derivatives Not Designated as Hedges (Detail) (Not Designated as Hedging Instrument, Foreign Exchange Forward Contracts, Selling, general and administrative expenses, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Not Designated as Hedging Instrument | Foreign Exchange Forward Contracts | Selling, general and administrative expenses
Derivative Instruments Gain Loss [Line Items]
Classification of (Gain) Loss Recognized in the Condensed Consolidated Statements of Operations	$ (33.5)	$ 17.0	$ 24.8