Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Identifiable intangible assets [Abstract]
Gross Value	$ 4,896.2		$ 5,135.8
Accumulated Amortization	(1,636.4)		(1,826.7)
Carrying Value	3,259.8		3,309.1
Amortization expense	36.1	$ 39.6
Forecasted amortization expense [Abstract]
Remainder of 2021	107.9
2022	159.5
2023	167.4
2024	163.6
2025	162.2
Impairment of intangible assets	6.8
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4		610.4
Accumulated Amortization	(282.3)		(276.3)
Carrying Value	328.1		334.1
Amortization expense	6.0	6.5
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8
Accumulated Amortization	(224.5)		(221.3)
Carrying Value	223.3		226.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6		162.6
Accumulated Amortization	(57.8)		(55.0)
Carrying Value	104.8		107.6
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,478.1		2,478.1
Accumulated Amortization	(559.3)		(541.5)
Carrying Value	1,918.8		1,936.6
Amortization expense	17.8	20.9
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,195.0		2,195.0
Accumulated Amortization	(306.1)		(291.6)
Carrying Value	1,888.9		1,903.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.1		283.1
Accumulated Amortization	(253.2)		(249.9)
Carrying Value	29.9		33.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,581.4		1,821.0
Accumulated Amortization	(700.2)		(916.0)
Carrying Value	881.2		905.0
Amortization expense	10.6	10.2
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3
Accumulated Amortization	(521.1)		(512.2)
Carrying Value	829.2		838.1
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	231.1		470.7
Accumulated Amortization	(179.1)		(403.8)
Carrying Value	52.0		66.9
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	226.3		226.3
Accumulated Amortization	(94.6)		(92.9)
Carrying Value	131.7		133.4
Amortization expense	1.7	$ 2.0
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4
Accumulated Amortization	(69.7)		(68.3)
Carrying Value	111.7		113.1
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	44.9		44.9
Accumulated Amortization	(24.9)		(24.6)
Carrying Value	$ 20.0		$ 20.3

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 for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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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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