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Location and Fair Value Amount of Derivative Instruments Reported in Consolidated Balance Sheet (Detail) (Derivatives not designated as hedging instruments under ASC 815, USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value		$ 0.2
Liability Derivatives, Fair Value	0.5
Commodity Contract \| Prepaid Expenses And Other Current Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value		0.2
Commodity Contract \| Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 0.5

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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- Definition

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

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