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Derivatives (Details) (Cash Flow Hedging [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commodity Price Hedges [Member]
Amounts related to cash flow hedges
Losses (gains) included in AOCI	$ 6.1	$ (11.7)
(Benefit from) provision for income taxes	(3.5)	6.7
Interest Rate Swap [Member]
Amounts related to cash flow hedges
Losses (gains) included in AOCI	1.1	2.3
(Benefit from) provision for income taxes	$ (0.6)	$ (1.3)

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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