Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) (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 on Derivatives in Earnings	$ 48.1	$ (0.2)
Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	16.0	2.4
Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	0.8	2.3
Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Interest Rate and Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	15.1
Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Treasury Lock
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	0.1	0.1
Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	0.1	0.5
Not Designated as Hedging Instruments [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized on Derivatives in Earnings	$ 32.0	$ (3.1)