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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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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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Identifiable intangible assets [Abstract]
Gross Value	$ 4,899.6		$ 4,899.6		$ 5,135.8
Accumulated Amortization	(1,709.6)		(1,709.6)		(1,826.7)
Carrying Value	3,190.0		3,190.0		3,309.1
Amortization expense	39.7	$ 33.1	113.3	$ 109.3
Forecasted amortization expense [Abstract]
Remainder of 2021	37.4		37.4
2022	169.6		169.6
2023	173.8		173.8
2024	177.9		177.9
2025	174.4		174.4
Impairment of intangible assets			6.8
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	613.8		613.8		610.4
Accumulated Amortization	(290.6)		(290.6)		(276.3)
Carrying Value	323.2		323.2		334.1
Amortization expense	6.2	6.2	18.3	19.0
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8		447.8
Accumulated Amortization	(231.3)		(231.3)		(221.3)
Carrying Value	216.5		216.5		226.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	166.0		166.0		162.6
Accumulated Amortization	(59.3)		(59.3)		(55.0)
Carrying Value	106.7		106.7		107.6
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,478.1		2,478.1		2,478.1
Accumulated Amortization	(598.7)		(598.7)		(541.5)
Carrying Value	1,879.4		1,879.4		1,936.6
Amortization expense	20.3	16.0	57.2	55.7
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,195.0		2,195.0		2,195.0
Accumulated Amortization	(339.2)		(339.2)		(291.6)
Carrying Value	1,855.8		1,855.8		1,903.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.1		283.1		283.1
Accumulated Amortization	(259.5)		(259.5)		(249.9)
Carrying Value	23.6		23.6		33.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,581.4		1,581.4		1,821.0
Accumulated Amortization	(722.3)		(722.3)		(916.0)
Carrying Value	859.1		859.1		905.0
Amortization expense	11.5	9.0	32.7	28.8
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3		1,350.3
Accumulated Amortization	(541.1)		(541.1)		(512.2)
Carrying Value	809.2		809.2		838.1
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	231.1		231.1		470.7
Accumulated Amortization	(181.2)		(181.2)		(403.8)
Carrying Value	49.9		49.9		66.9
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	226.3		226.3		226.3
Accumulated Amortization	(98.0)		(98.0)		(92.9)
Carrying Value	128.3		128.3		133.4
Amortization expense	1.7	$ 1.9	5.1	$ 5.8
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(72.4)		(72.4)		(68.3)
Carrying Value	109.0		109.0		113.1
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	44.9		44.9		44.9
Accumulated Amortization	(25.6)		(25.6)		(24.6)
Carrying Value	$ 19.3		$ 19.3		$ 20.3