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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Identifiable intangible assets [Abstract]
Gross Value	$ 5,143.1		$ 5,143.1		$ 5,136.5
Accumulated Amortization	(1,763.7)		(1,763.7)		(1,687.5)
Carrying Value	3,379.4		3,379.4		3,449.0
Amortization expense	36.6	$ 45.3	76.2	$ 89.5
Forecasted amortization expense [Abstract]
Remainder of 2020	85.0		85.0
2021	167.6		167.6
2022	164.5		164.5
2023	162.9		162.9
2024	159.3		159.3
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4		610.4		610.4
Accumulated Amortization	(263.0)		(263.0)		(250.2)
Carrying Value	347.4		347.4		360.2
Amortization expense	6.3	9.0	12.8	18.1
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8		447.8
Accumulated Amortization	(213.4)		(213.4)		(206.3)
Carrying Value	234.4		234.4		241.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6		162.6		162.6
Accumulated Amortization	(49.6)		(49.6)		(43.9)
Carrying Value	113.0		113.0		118.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,487.0		2,487.0		2,480.4
Accumulated Amortization	(518.2)		(518.2)		(478.5)
Carrying Value	1,968.8		1,968.8		2,001.9
Amortization expense	18.8	24.1	39.7	46.1
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	(274.8)		(274.8)		(243.5)
Carrying Value	1,928.7		1,928.7		1,960.0
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.5		283.5		276.9
Accumulated Amortization	(243.4)		(243.4)		(235.0)
Carrying Value	40.1		40.1		41.9
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,818.3		1,818.3		1,818.3
Accumulated Amortization	(896.9)		(896.9)		(877.1)
Carrying Value	921.4		921.4		941.2
Amortization expense	9.6	10.0	19.8	20.9
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	(497.2)		(497.2)		(481.6)
Carrying Value	853.1		853.1		868.7
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	468.0		468.0		468.0
Accumulated Amortization	(399.7)		(399.7)		(395.5)
Carrying Value	68.3		68.3		72.5
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(85.6)		(85.6)		(81.7)
Carrying Value	141.8		141.8		145.7
Amortization expense	1.9	$ 2.2	3.9	$ 4.4
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(60.7)		(60.7)		(57.5)
Carrying Value	120.7		120.7		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	(24.9)		(24.9)		(24.2)
Carrying Value	$ 21.1		$ 21.1		$ 21.8