Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 57.6
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	13.1
Business Combination, Consideration Given [Abstract]
Cash consideration	1,394.2
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Proved properties	713.8
Unproved Properties	684.9
Asset retirement obligations	(0.9)
Liabilities assumed	(4.4)
Other assets	0.8
Total fair value	1,394.2
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue		637.9
Business Acquisition, Pro Forma Net Income (Loss)		173.0
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 0.97
Business Acquisition, Pro Forma Earnings Per Share, Diluted		$ 0.97
Busines Acquisition, Actual Information [Abstract]
Oil and Gas Revenue	696.5	603.2
Net Income (Loss) Attributable to Parent	$ (4.3)	$ 155.2
Earnings Per Share, Basic	$ (0.02)	$ 0.87
Earnings Per Share, Diluted	$ (0.02)	$ 0.87

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Amount of cash paid to acquire the entity.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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The amount of acquisition cost of a business combination allocated to mineral rights for acquired entities in the mining industry.

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Amount of acquisition cost of a business combination allocated to other assets not separately disclosed in the balance sheet.

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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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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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