Business Combination (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Nov. 01, 2011
Business Combination Event [Line Items]
Total Ownership Percentage		100.00%
Acreage dedication		100,000
Business Combination, Consideration Transferred		$ 200.4
Current assets		5.4
Net property, plant and equipment		24.3
Intangible assets		136.3
Goodwill		39.4
Current liabilities assumed		(5.0)
Useful Life of Intangible Assets	15
Intangible Assets, Net (Excluding Goodwill)	134.8
Accumulated Amortization of Intangible Assets	$ 1.5

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Ownership Percentage in Roger Mills Gas Gathering, LLC

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The amount of acquisition cost of a business combination allocated to current assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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- Definition

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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