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Asset Retirement Obligations - Additional Information (Details) (Offshore Platform)	12 Months Ended
	Dec. 31, 2010
Offshore Platform
Reconciliation Of Changes In Asset Retirement Obligations [Line Items]
Asset retirement obligations	21.8

X

- Details

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X

- Definition

Description of the significant increases or decreases in the carrying amount of the asset retirement obligation during the period, such as changes in significant assumptions used to calculate the carrying amount of the asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 22

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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