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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | $ 1.7 | $ 33.3
Impairment of other current assets | 1.1 |
Impairment of long-lived assets disposed of other than by sale | 0.6 | 33.1
Impairment of long-lived assets held for sale |  | 0.2
NGL Pipelines & Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 0.4 | 0.8
Crude Oil Pipelines & Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 0.2 | 7.8
Natural Gas Pipelines & Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 0.0 | 20.7
Petrochemical & Refined Products Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 1.1 | 0.4
Offshore Pipelines & Services [Member] |  |
Asset Impairment Charges [Abstract] |  |
Non-cash asset impairment charges | 0.0 | 3.6
Fair Value, Measurements, Nonrecurring [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] | Long-lived Assets Held For Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value |  | 0.6
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 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held For 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 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Held For 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 | $ 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held For Sale [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets, fair value |  | $ 0.6

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- Definition The charge against earnings resulting from the write down of other current assets due to the difference between the carrying value and lower fair value. + References No definition available. + Details
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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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: 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=56944662&loc=d3e3602-108585 + 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=36462937&loc=d3e19207-110258 + Details
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