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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Asset Impairment Charges [Abstract] |  |  |
Asset impairment and related charges | $ 53.5 | $ 162.6 | $ 34.0
Loss due to Pascagoula fire | 7.1 |  |
Impairment of other current assets | 1.2 |  |
Impairment of long-lived assets disposed of other than by sale | 29.9 | 81.4 | 26.7
Impairment of long-lived assets held and used | 2.2 |  |
Impairment of long-lived assets held for sale |  | 14.2 | 3.6
Impairment of long-lived assets disposed of by sale | 13.1 | 67.0 | 3.7
Impairment of long-lived assets | 45.2 | 162.6 | 34.0
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] |  |  |
Impairment of long-lived assets | 21.0 | 20.8 | 16.2
Crude Oil Pipelines & Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 2.3 | 33.5 | 2.9
Natural Gas Pipelines & Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 12.3 | 21.6 | 0.7
Petrochemical and Refined Products Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 9.6 | 28.2 | 9.1
Offshore Pipelines And Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 0.0 | 58.5 | 5.1
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 | 0.4 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 8.0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value |  | 18.0 | 1.5
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 | 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
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 8.0 |  |
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
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 | 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
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 Held For 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 By Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 0.0 | 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 | 0.0 | 0.4 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 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 |  | 18.0 | 1.5
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 | $ 0.0

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