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Significant Risks and Uncertainties (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2012 February 2011 West Storage Incident [Member] | Dec. 31, 2011 February 2011 West Storage Incident [Member] | Dec. 31, 2012 BP [Member]
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Entity-Wide Revenue, Major Customer, Percentage |  |  |  |  |  | 9.50%
Insurance Matters [Abstract] |  |  |  |  |  |
Minimum insurance deductible per incident |  |  | $ 5.0 |  |  |
Maximum insurance deductible per incident |  |  | 60.0 |  |  |
Coverage by certain producers for each of the Independence Hub and Marco Polo platforms |  |  | 350.0 |  |  |
Schedule of Gains Recognized From Business Insurance Recoveries [Line Items] |  |  |  |  |  |
Gains recognized from business interruption settlements | 4.3 | 1.1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of cost related to incident |  |  |  | 150 |  |
Gains related to property damage proceeds |  | 56.6 |  | 30.0 | 4.7 |
Proceeds from property damage insurance recoveries |  | $ 64.8 |  | $ 30.0 | $ 20.0 |

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- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6365675&loc=d3e16285-107787 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 01-13 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -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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