Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Identifiable intangible assets [Abstract]
Gross Value	$ 5,136.5		$ 5,136.5
Accumulated Amortization	(1,727.1)		(1,687.5)
Carrying Value	3,409.4		3,449.0
Amortization expense	39.6	$ 44.2
Forecasted amortization expense [Abstract]
Remainder of 2020	125.1
2021	167.1
2022	164.1
2023	162.4
2024	158.9
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4		610.4
Accumulated Amortization	(256.7)		(250.2)
Carrying Value	353.7		360.2
Amortization expense	6.5	9.1
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8
Accumulated Amortization	(210.0)		(206.3)
Carrying Value	237.8		241.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6		162.6
Accumulated Amortization	(46.7)		(43.9)
Carrying Value	115.9		118.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4		2,480.4
Accumulated Amortization	(499.4)		(478.5)
Carrying Value	1,981.0		2,001.9
Amortization expense	20.9	22.0
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5		2,203.5
Accumulated Amortization	(260.1)		(243.5)
Carrying Value	1,943.4		1,960.0
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	276.9		276.9
Accumulated Amortization	(239.3)		(235.0)
Carrying Value	37.6		41.9
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,818.3		1,818.3
Accumulated Amortization	(887.3)		(877.1)
Carrying Value	931.0		941.2
Amortization expense	10.2	10.9
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3
Accumulated Amortization	(489.6)		(481.6)
Carrying Value	860.7		868.7
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	468.0		468.0
Accumulated Amortization	(397.7)		(395.5)
Carrying Value	70.3		72.5
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4
Accumulated Amortization	(83.7)		(81.7)
Carrying Value	143.7		145.7
Amortization expense	2.0	$ 2.2
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4
Accumulated Amortization	(59.1)		(57.5)
Carrying Value	122.3		123.9
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0		46.0
Accumulated Amortization	(24.6)		(24.2)
Carrying Value	$ 21.4		$ 21.8

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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