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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Customer relationship intangibles [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] State Line Gathering [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Fairplay Gathering [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Fairplay Processing [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] State Line and Fairplay [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] San Juan Gathering [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] Minimum [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Offshore Pipelines and Platforms [Member] Maximum [Member] | Dec. 31, 2013 Customer relationship intangibles [Member] Encinal [Member] | Dec. 31, 2013 Contract-based intangibles [Member] | Dec. 31, 2013 Contract-based intangibles [Member] San Juan Gathering [Member] | Dec. 31, 2013 Contract-based intangibles [Member] Jonah Gas Gathering [Member] | Dec. 31, 2013 Contract-based intangibles [Member] Shell Processing Agreement [Member]
Identifiable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Value | $ 2,612.2 | $ 2,616.8 |  |  | $ 675.0 | [1] | $ 116.6 | [1] | $ 103.4 | [2] | $ 895.0 |  |  |  |  |  |  |  |  |
Accumulated Amortization | (1,150.0) | (1,050.0) |  |  | (62.2) | [1] | (24.2) | [1] | (21.5) | [2] | (107.9) |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,462.2 | $ 1,566.8 | $ 1,656.2 | $ 1,180.0 | $ 612.8 | [1] | $ 92.4 | [1] | $ 81.9 | [2] | $ 787.1 | $ 159.7 | $ 53.9 |  |  | $ 56.9 | $ 280.3 | $ 44.9 | $ 89.4 | $ 61.7
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=26713463&loc=d3e16323-109275 + 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=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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