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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Asset Impairment Charges [Abstract]
Impairment of other current assets			$ 0.8	$ 12.0
Impairment of long-lived assets	$ 3.9	$ 9.7	20.6	23.2
NGL Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets	1.3	5.4	13.7	8.4
Crude Oil Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets	0.0	1.8	0.3	2.4
Natural Gas Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets	1.0	1.9	3.5	11.8
Petrochemical & Refined Products Services [Member]
Asset Impairment Charges [Abstract]
Impairment of long-lived assets	$ 1.6	$ 0.6	$ 3.1	$ 0.6

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets.

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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.

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No definition available.

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