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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | $ 92.6 |  | $ 63.4 |  | $ 27.8
Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 79.4 | [1] | 56.5 | [2] |
Long-lived Assets Held and Used [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 9.0 |  | 2.6 |  |
Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 9.0 |  | 4.3 |  |
Property, Plant and Equipment [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 92.6 |  |  |  |
NGL Pipelines and Services [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 30.6 |  | 16.3 |  | 11.3
Onshore Natural Gas Pipelines And Services [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 0 |  | 29.2 |  | 10.4
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 30.1 |  | 10.6 |  | 0
Offshore Pipelines And Services [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 18.0 |  | 4.0 |  | 5.5
Offshore Natural Gas Gathering Systems [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 4.8 |  |  |  |
Petrochemical and Refined Products Services [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 18.7 |  | 3.3 |  | 0.6
Fair Value [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Non-cash asset impairment charges | 97.4 |  | 63.4 |  | 27.8
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 | [1] | 0.8 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held and Used [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 44.6 |  | 2.2 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0.6 |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 | [1] | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 | [1] | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 0 | [1] | 0.8 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | 44.6 |  | 2.2 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value | $ 0.6 |  | $ 0 |  |
[1] | Our non-cash asset impairment charges for the year ended December 31, 2013 primarily represent the abandonment of crude oil and natural gas pipeline segments in Texas, Oklahoma and the Gulf of Mexico, certain refined products terminal assets in Texas, an NGL storage cavern in Arizona and an NGL fractionator and storage caverns in Ohio.
[2] | Our non-cash asset impairment charges for the year ended December 31, 2012 primarily represent the abandonment of crude oil and natural gas pipeline segments in Texas and the Gulf of Mexico.

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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