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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Identifiable intangible assets [Abstract]
Gross Value	$ 5,136.5		$ 5,136.5		$ 5,343.5
Accumulated Amortization	(1,647.1)		(1,647.1)		(1,735.1)
Carrying Value	3,489.4		3,489.4		3,608.4
Amortization expense	44.8	$ 41.9	134.3	$ 128.6
Forecasted amortization expense [Abstract]
Remainder of 2019	40.5		40.5
2020	161.8		161.8
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	610.4		610.4		820.7
Accumulated Amortization	(243.7)		(243.7)		(440.6)
Carrying Value	366.7		366.7		380.1
Amortization expense	7.3	9.2	25.4	25.6
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8		447.8		457.3
Accumulated Amortization	(202.8)		(202.8)		(201.9)
Carrying Value	245.0		245.0		255.4
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6		162.6		363.4
Accumulated Amortization	(40.9)		(40.9)		(238.7)
Carrying Value	121.7		121.7		124.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4		2,480.4		2,480.4
Accumulated Amortization	(457.0)		(457.0)		(385.8)
Carrying Value	2,023.4		2,023.4		2,094.6
Amortization expense	25.1	20.7	71.2	67.3
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	(226.9)		(226.9)		(174.1)
Carrying Value	1,976.6		1,976.6		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	(230.1)		(230.1)		(211.7)
Carrying Value	46.8		46.8		65.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,818.3		1,818.3		1,815.0
Accumulated Amortization	(866.9)		(866.9)		(835.7)
Carrying Value	951.4		951.4		979.3
Amortization expense	10.3	9.8	31.2	29.1
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	(473.3)		(473.3)		(447.8)
Carrying Value	877.0		877.0		902.5
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	468.0		468.0		464.7
Accumulated Amortization	(393.6)		(393.6)		(387.9)
Carrying Value	74.4		74.4		76.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(79.5)		(79.5)		(73.0)
Carrying Value	147.9		147.9		154.4
Amortization expense	2.1	$ 2.2	6.5	$ 6.6
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(56.2)		(56.2)		(51.8)
Carrying Value	125.2		125.2		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	(23.3)		(23.3)		(21.2)
Carrying Value	$ 22.7		$ 22.7		$ 24.8