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Sale of Retail Gas Marketing Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Sale of Retail Gas Marketing Operations [Abstract]
Gain (loss) on disposal	$ 25.4

- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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