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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges | $ 27.1 | $ 9.1 | $ 38.1 | $ 14.5
Crude oil pipeline segments in Texas and Oklahoma [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 16.6 | 6.2
Refined products terminal and storage assets in Texas [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 10.0 |
Underground and other storage facilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 6.3 |
NGL fractionator in Texas [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  |  | 4.6
Tri-States Pipeline [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  |  | 2.9
Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 29.8 | 14.2
Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 4.2 |
Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges |  |  | 4.1 | 0.3
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 40.9 | 0 | 40.9 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 6.3 |  | 6.3 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 34.6 | 0 | 34.6 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Level 1 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [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] | Fair Value [Member] | Level 1 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 33.8 | 0 | 33.8 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Level 2 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [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] | Fair Value [Member] | Level 2 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Level 3 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0 | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 6.3 |  | 6.3 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0.8 | 0 | 0.8 | 0
NGL Pipelines and Services [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges | 8.7 | 2.9 | 9.7 | 8.0
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges | 16.6 | 6.2 | 16.6 | 6.2
Petrochemical and Refined Products Services [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Non-cash asset impairment charges | $ 1.8 | $ 0 | $ 11.8 | $ 0.3

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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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