Acquisitions & Divestitures (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 56.5		$ 114.1
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	10.3		23.4
Business Combination, Consideration Given [Abstract]
Cash consideration	1,392.3		1,392.3
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Proved properties	713.8		713.8
Unproved Properties	683.1		683.1
Asset retirement obligations	(0.9)		(0.9)
Liabilities assumed	(4.5)		(4.5)
Other assets	0.8		0.8
Total fair value	1,392.3		1,392.3
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue		543.6		1,181.5
Business Acquisition, Pro Forma Net Income (Loss)		2.8		160.1
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 0.02		$ 0.90
Business Acquisition, Pro Forma Earnings Per Share, Diluted		$ 0.02		$ 0.90
Busines Acquisition, Actual Information [Abstract]
Oil and Gas Revenue	751.0	499.3	1,447.5	1,102.5
Net Income (Loss) Attributable to Parent	$ 178.4	$ (0.7)	$ 174.1	$ 154.5
Earnings Per Share, Basic	$ 0.99	$ 0.00	$ 0.97	$ 0.87
Earnings Per Share, Diluted	$ 0.99	$ 0.00	$ 0.97	$ 0.87

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Amount of cash paid to acquire the entity.

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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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