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Subsequent Events Subsequent Events - Gulf Properties Pro Forma Financial Information (Unaudited) (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Subsequent Event [Line Items] |  |  |
Full cost ceiling impairments | $ 0 | $ 0 | $ 0
Subsequent Event | Gulf of Mexico Properties | Pro Forma |  |  |
Subsequent Event [Line Items] |  |  |
Full cost ceiling impairments | 441.0 |  |
Subsequent Event | Gulf of Mexico Properties | Pro Forma | Noncontrolling Interest |  |  |
Subsequent Event [Line Items] |  |  |
Full cost ceiling impairments | 80.0 |  |
Subsequent Event | Gulf of Mexico Properties | Pro Forma | Parent Company |  |  |
Subsequent Event [Line Items] |  |  |
Full cost ceiling impairments | $ 361.0 |  |

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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 4(ii) -Article 4 + Details
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