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Pretax Amounts Related to Commodity Swap Contracts that were Recognized in and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) (Commodity Contract, Designated as Hedging Instrument, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Commodity Contract \| Designated as Hedging Instrument
Contracts qualifying for hedge accounting:
Gains recognized in accumulated other comprehensive loss	$ 0.1
Losses reclassified from accumulated other comprehensive loss	0.2
Comprehensive income	$ 0.3

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details