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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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Identifiable intangible assets [Abstract]
Gross Value	$ 5,347.7		$ 5,347.7		$ 5,343.5
Accumulated Amortization	(1,815.1)		(1,815.1)		(1,735.1)
Carrying Value	3,532.6		3,532.6		3,608.4
Amortization expense	45.3	$ 43.6	89.5	$ 86.7
Forecasted amortization expense [Abstract]
Remainder of 2019	82.1		82.1
2020	160.5		160.5
2021	162.8		162.8
2022	168.4		168.4
2023	168.5		168.5
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	823.2		823.2		820.7
Accumulated Amortization	(449.2)		(449.2)		(440.6)
Carrying Value	374.0		374.0		380.1
Amortization expense	9.0	9.3	18.1	16.4
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8		457.3
Accumulated Amortization	(199.3)		(199.3)		(201.9)
Carrying Value	248.5		248.5		255.4
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	375.4		375.4		363.4
Accumulated Amortization	(249.9)		(249.9)		(238.7)
Carrying Value	125.5		125.5		124.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4		2,480.4		2,480.4
Accumulated Amortization	(431.9)		(431.9)		(385.8)
Carrying Value	2,048.5		2,048.5		2,094.6
Amortization expense	24.1	22.6	46.1	46.6
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	(207.7)		(207.7)		(174.1)
Carrying Value	1,995.8		1,995.8		2,029.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	276.9		276.9		276.9
Accumulated Amortization	(224.2)		(224.2)		(211.7)
Carrying Value	52.7		52.7		65.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,816.7		1,816.7		1,815.0
Accumulated Amortization	(856.6)		(856.6)		(835.7)
Carrying Value	960.1		960.1		979.3
Amortization expense	10.0	9.6	20.9	19.3
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	(464.9)		(464.9)		(447.8)
Carrying Value	885.4		885.4		902.5
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.4		466.4		464.7
Accumulated Amortization	(391.7)		(391.7)		(387.9)
Carrying Value	74.7		74.7		76.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(77.4)		(77.4)		(73.0)
Carrying Value	150.0		150.0		154.4
Amortization expense	2.2	$ 2.1	4.4	$ 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	(54.8)		(54.8)		(51.8)
Carrying Value	126.6		126.6		129.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0		46.0		46.0
Accumulated Amortization	(22.6)		(22.6)		(21.2)
Carrying Value	$ 23.4		$ 23.4		$ 24.8