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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Asset Impairment Charges [Abstract] |  |  |
Asset impairment and related charges | $ 50.5 | $ 49.8 | $ 53.5
Impairment of other current assets | 3.7 | 12.0 | 1.2
Loss due to Pascagoula fire |  |  | 7.1
Impairment of long-lived assets disposed of other than by sale | 43.7 | 16.7 | 29.9
Impairment of long-lived assets held and used | 3.1 | 15.4 | 2.2
Impairment of long-lived assets held for sale |  | 2.5 |
Impairment of long-lived assets disposed of by sale |  | 3.2 | 13.1
Impairment of long-lived assets | 46.8 | 37.8 | 45.2
Certain storage and pipeline assets in Texas [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets |  | 12.4 |
Natural gas pipeline laterals and other pipelines in Texas [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets |  | 13.0 |
NGL Pipelines and Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 18.6 | 11.5 | 21.0
Crude Oil Pipelines & Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 11.2 | 10.2 | 2.3
Natural Gas Pipelines & Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 13.9 | 14.3 | 12.3
Petrochemical and Refined Products Services [Member] |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment of long-lived assets | 3.1 | 1.8 | 9.6
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 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held and Used [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value | 0.0 | 1.5 | 8.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Assets, fair value |  | 2.5 |
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
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 | 0.0 | 0.0 | 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 |
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
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 | 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 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 | 0.0 | 0.0 | 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 | 1.5 | 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 |  | 2.5 |
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

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