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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Asset Impairment Charges [Abstract] |  |  |  |
Asset impairment and related charges |  |  | $ 25.2 | $ 22.3
Loss due to Pascagoula fire |  |  |  | 7.1
Impairment of other current assets |  |  | 11.7 | 1.2
Impairment of long-lived assets disposed of other than by sale |  |  | 0.9 | 4.5
Impairment of long-lived assets held and used |  |  | 3.1 |
Impairment of long-lived assets held for sale |  |  | 9.5 | 9.5
Impairment of long-lived assets | $ 13.1 | $ 13.4 | 13.5 | 14.0
NGL Pipelines & Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Impairment of long-lived assets | 2.8 | 2.1 | 3.0 | 2.4
Crude Oil Pipelines & Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Impairment of long-lived assets | 0.6 | 0.7 | 0.6 | 0.9
Natural Gas Pipelines & Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Impairment of long-lived assets | 9.7 | 9.7 | 9.9 | 9.7
Petrochemical & Refined Products Services [Member] |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |
Impairment of long-lived assets | 0.0 | 0.9 | 0.0 | 1.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 0.0 | 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 | 1.4 |  | 1.4 |
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | 1.2 | 1.5 | 1.2 | 1.5
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 and Used [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 | 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 | 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 |
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 | 1.5 | 0.0 | 1.5
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 | 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 | 1.4 |  | 1.4 |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held For Sale [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Assets, fair value | $ 1.2 | $ 0.0 | $ 1.2 | $ 0.0

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