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 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, Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Identifiable intangible assets [Abstract]
Gross Value	$ 5,347.6		$ 5,347.6		$ 5,255.1
Accumulated Amortization	(1,693.4)		(1,693.4)		(1,564.8)
Carrying Value	3,654.2		3,654.2		3,690.3
Amortization expense	41.9	$ 41.4	128.6	$ 123.1
Forecasted amortization expense [Abstract]
Remainder of 2018	36.8		36.8
2019	151.7		151.7
2020	140.7		140.7
2021	148.4		148.4
2022	144.6		144.6
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	820.7		820.7		728.2
Accumulated Amortization	(431.5)		(431.5)		(405.9)
Carrying Value	389.2		389.2		322.3
Amortization expense	9.2	7.2	25.6	21.8
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	457.3		457.3		447.4
Accumulated Amortization	(198.4)		(198.4)		(187.5)
Carrying Value	258.9		258.9		259.9
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	363.4		363.4		280.8
Accumulated Amortization	(233.1)		(233.1)		(218.4)
Carrying Value	130.3		130.3		62.4
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,484.5		2,484.5		2,484.5
Accumulated Amortization	(365.3)		(365.3)		(298.0)
Carrying Value	2,119.2		2,119.2		2,186.5
Amortization expense	20.7	22.6	67.3	68.0
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	(161.8)		(161.8)		(127.0)
Carrying Value	2,041.7		2,041.7		2,076.5
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	281.0		281.0		281.0
Accumulated Amortization	(203.5)		(203.5)		(171.0)
Carrying Value	77.5		77.5		110.0
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0		1,815.0
Accumulated Amortization	(825.7)		(825.7)		(796.6)
Carrying Value	989.3		989.3		1,018.4
Amortization expense	9.8	9.3	29.1	26.3
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	(439.9)		(439.9)		(417.1)
Carrying Value	910.4		910.4		933.2
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7		464.7		464.7
Accumulated Amortization	(385.8)		(385.8)		(379.5)
Carrying Value	78.9		78.9		85.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(70.9)		(70.9)		(64.3)
Carrying Value	156.5		156.5		163.1
Amortization expense	2.2	$ 2.3	6.6	$ 7.0
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(50.3)		(50.3)		(45.9)
Carrying Value	131.1		131.1		135.5
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0		46.0		46.0
Accumulated Amortization	(20.6)		(20.6)		(18.4)
Carrying Value	$ 25.4		$ 25.4		$ 27.6