Fair Value Measurements - Offsetting of Derivative Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 15.1	$ 14.5
Gross Amounts Offset in the Balance Sheet, Derivative Assets	(6.9)	(5.4)
Net Amounts of Assets Presented in the Balance Sheet	8.2	9.1
Foreign exchange currency contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	15.1	14.5
Gross Amounts Offset in the Balance Sheet, Derivative Assets	(6.9)	(5.4)
Net Amounts of Assets Presented in the Balance Sheet	$ 8.2	$ 9.1

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant