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Intangible Assets and Goodwill, Significant Intangible Assets (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Customer relationship intangibles [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] State Line Gathering [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Fairplay Gathering [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Fairplay Processing [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] State Line and Fairplay [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] San Juan Gathering [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] Minimum [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] Maximum [Member] | Dec. 31, 2012 Customer relationship intangibles [Member] Encinal [Member] | Dec. 31, 2012 Contract-based intangibles [Member] | Dec. 31, 2012 Contract-based intangibles [Member] San Juan Gathering [Member] | Dec. 31, 2012 Contract-based intangibles [Member] Jonah Gas Gathering [Member] | Dec. 31, 2012 Contract-based intangibles [Member] Shell Processing Agreement [Member]
Identifiable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Value | $ 2,616.8 | $ 2,646.6 |  |  | $ 675.0 | [1] | $ 116.6 | [1] | $ 103.4 | [2] | $ 895.0 |  |  |  |  |  |  |  |  |
Accumulated Amortization | (1,050.0) | (990.4) |  |  | (52.8) | [1] | (18.2) | [1] | (16.1) | [2] | (87.1) |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,566.8 | $ 1,656.2 | $ 1,841.7 | $ 1,250.0 | $ 622.2 | [1] | $ 98.4 | [1] | $ 87.3 | [2] | $ 807.9 | $ 173.4 | $ 65.4 |  |  | $ 64.1 | $ 317.9 | $ 56.7 | $ 96.1 | $ 72.7
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 27 years |  | 23 years |  | 23 years |  |  | 35 years |  | 11 years | 33 years | 20 years |  | 20 years | 40 years | 20 years
[1] | These natural gas gathering customer relationship intangible assets are a component of our Onshore Natural Gas Pipelines & Services business segment.
[2] | The Fairplay natural gas processing customer relationship intangible assets are a component of our NGL Pipelines & Services business segment.

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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 Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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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