Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Fair Value of Asset Derivatives	$ 63.4	$ 10.5
Fair Value of (Liability) Derivatives	(68.0)	(51.5)
Designated as Hedging Instruments [Member] \| Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Fair Value of Asset Derivatives	4.3	3.4
Fair Value of (Liability) Derivatives	(0.4)	(1.4)
Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives Fair Value [Line Items]
Fair Value of (Liability) Derivatives		(1.0)
Designated as Hedging Instruments [Member] \| Interest Rate And Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Fair Value of Asset Derivatives	17.8
Not Designated as Hedging Instruments [Member] \| Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Fair Value of Asset Derivatives	41.3	7.1
Fair Value of (Liability) Derivatives	$ (67.6)	$ (49.1)

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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