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Capitalization of Exploratory Well Costs (Tables) | 12 Months Ended
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Dec. 31, 2014
Inventory Disclosure [Abstract] |
Schedule of Capitalized Exploratory Well Costs |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Capitalized exploratory well costs that have been capitalized for a period less than one year |  |  |  |  |  |  | - |  |  |  | 5.9 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year |  |  | 8.9 |  |  |  | 16.7 |  |  |  | 8.1 |
Total |  |  | 8.9 |  |  |  | 16.7 |  |  |  | 14.0 |
Number of exploratory wells that have been capitalized for a period greater than one year |  |  | 1 |  |  |  | 2 |  |  |  | 1 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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