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Derivatives (Details) (Commodity Price Hedges [Member], Cash Flow Hedging [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Commodity Price Hedges [Member] \| Cash Flow Hedging [Member]
Amounts related to cash flow hedges
Losses (gains) included in AOCI, net of tax	$ 2.3	$ (1.1)
Expense for (benefit from) income taxes	$ (1.3)	$ 0.7

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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