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Gas Gathering Divestiture (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Business Acquisition [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 35.0
Gain (Loss) on Sale of Property Plant Equipment	$ 9.9

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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