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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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Identifiable intangible assets [Abstract]
Gross Value	$ 5,145.4		$ 5,145.4		$ 5,136.5
Accumulated Amortization	(1,796.8)		(1,796.8)		(1,687.5)
Carrying Value	3,348.6		3,348.6		3,449.0
Amortization expense	33.1	$ 44.8	109.3	$ 134.3
Forecasted amortization expense [Abstract]
Remainder of 2020	45.1		45.1
2021	145.5		145.5
2022	162.3		162.3
2023	169.9		169.9
2024	165.7		165.7
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4		610.4		610.4
Accumulated Amortization	(269.2)		(269.2)		(250.2)
Carrying Value	341.2		341.2		360.2
Amortization expense	6.2	7.3	19.0	25.4
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8		447.8
Accumulated Amortization	(217.0)		(217.0)		(206.3)
Carrying Value	230.8		230.8		241.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6		162.6		162.6
Accumulated Amortization	(52.2)		(52.2)		(43.9)
Carrying Value	110.4		110.4		118.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,486.6		2,486.6		2,480.4
Accumulated Amortization	(534.2)		(534.2)		(478.5)
Carrying Value	1,952.4		1,952.4		2,001.9
Amortization expense	16.0	25.1	55.7	71.2
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5		2,203.5		2,203.5
Accumulated Amortization	(287.5)		(287.5)		(243.5)
Carrying Value	1,916.0		1,916.0		1,960.0
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.1		283.1		276.9
Accumulated Amortization	(246.7)		(246.7)		(235.0)
Carrying Value	36.4		36.4		41.9
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,821.0		1,821.0		1,818.3
Accumulated Amortization	(905.9)		(905.9)		(877.1)
Carrying Value	915.1		915.1		941.2
Amortization expense	9.0	10.3	28.8	31.2
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	(504.2)		(504.2)		(481.6)
Carrying Value	846.1		846.1		868.7
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	470.7		470.7		468.0
Accumulated Amortization	(401.7)		(401.7)		(395.5)
Carrying Value	69.0		69.0		72.5
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(87.5)		(87.5)		(81.7)
Carrying Value	139.9		139.9		145.7
Amortization expense	1.9	$ 2.1	5.8	$ 6.5
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(62.2)		(62.2)		(57.5)
Carrying Value	119.2		119.2		123.9
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0		46.0		46.0
Accumulated Amortization	(25.3)		(25.3)		(24.2)
Carrying Value	$ 20.7		$ 20.7		$ 21.8