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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | $ 26.8 | $ 5.7 | $ 139.1 | $ 18.2
Impairment of long-lived assets disposed of other than by sale |  |  |  | 69.9 | 11.7
Impairment of long-lived assets held for sale |  |  |  | 14.2 | 6.5
Impairment of long-lived assets disposed of by sale | [1] |  |  | 55.0 |
Offshore Business [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Impairment of long-lived assets disposed of by sale |  |  |  | 54.8 |
NGL Pipelines and Services [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | 14.6 | 1.2 | 20.6 | 6.6
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | 0.0 | 0.4 | 25.9 | 2.2
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | 0.0 | 0.4 | 21.5 | 0.7
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | 12.2 | 3.7 | 12.6 | 8.7
Offshore Pipelines And Services [Member] |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |
Non-cash asset impairment charges |  | 0.0 | 0.0 | 58.5 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value |  | 0.4 | 0.0 | 0.4 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value |  | 34.2 | 1.1 | 34.2 | 1.1
Fair Value, Measurements, Nonrecurring [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] | 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 | 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 | 0.0 | 0.0 | 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 |  | 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 | 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 | 0.0 | 0.0 | 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 |  | 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 |  | 0.4 | 0.0 | 0.4 | 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 |  | 34.2 | $ 1.1 | 34.2 | $ 1.1
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of By Sale [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Assets, fair value |  | $ 0.0 |  | $ 0.0 |
[1] | Primarily represents the impairment charge recorded in second quarter of 2015 upon reclassification of our Offshore Business to held for sale status.

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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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