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Acquisitions and Dispositions (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Sep. 08, 2014 | Jun. 20, 2014
Business Acquisition [Line Items] |  |  |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances |  |  | $ 62.0 |  |
Eagle Ford [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal Date |  | Jun. 20, 2014 |  |  |
Business Combination, Consideration Transferred |  | $ 3,100.0 |  |  |
Effective Date |  | Apr. 01, 2014 |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances |  | $ 62.0 |  |  |
Adjustment to Goodwill |  | 221.0 |  |  |
Escrow Deposit Disbursements Related to Property Acquisition |  |  |  |  | $ 1,300.0
Deepwater Gulf of Mexico Interests [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 496.0 | $ 918.0 |  |  |
Effective Date | Sep. 08, 2014 | Jun. 30, 2014 |  |  |
Escrow Deposit Disbursements Related to Property Acquisition |  |  |  | $ 414.0 |
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Subject to Depletion | $ 509.0 | $ 451.0 |  |  |
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Not Subject to Depletion |  | 477.0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Costs |  | $ 10.0 |  |  |

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