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 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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Identifiable intangible assets [Abstract]
Gross Value	$ 5,347.6		$ 5,347.6		$ 5,255.1
Accumulated Amortization	(1,651.5)		(1,651.5)		(1,564.8)
Carrying Value	3,696.1		3,696.1		3,690.3
Amortization expense	43.6	$ 40.7	86.7	$ 81.7
Forecasted amortization expense [Abstract]
Remainder of 2018	75.8		75.8
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	(422.3)		(422.3)		(405.9)
Carrying Value	398.4		398.4		322.3
Amortization expense	9.3	7.3	16.4	14.6
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	457.3		457.3		447.4
Accumulated Amortization	(194.8)		(194.8)		(187.5)
Carrying Value	262.5		262.5		259.9
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	363.4		363.4		280.8
Accumulated Amortization	(227.5)		(227.5)		(218.4)
Carrying Value	135.9		135.9		62.4
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,484.5		2,484.5		2,484.5
Accumulated Amortization	(344.6)		(344.6)		(298.0)
Carrying Value	2,139.9		2,139.9		2,186.5
Amortization expense	22.6	22.3	46.6	45.4
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	(151.0)		(151.0)		(127.0)
Carrying Value	2,052.5		2,052.5		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	(193.6)		(193.6)		(171.0)
Carrying Value	87.4		87.4		110.0
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0		1,815.0		1,815.0
Accumulated Amortization	(815.9)		(815.9)		(796.6)
Carrying Value	999.1		999.1		1,018.4
Amortization expense	9.6	8.8	19.3	17.0
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	(432.1)		(432.1)		(417.1)
Carrying Value	918.2		918.2		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	(383.8)		(383.8)		(379.5)
Carrying Value	80.9		80.9		85.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4		227.4
Accumulated Amortization	(68.7)		(68.7)		(64.3)
Carrying Value	158.7		158.7		163.1
Amortization expense	2.1	$ 2.3	4.4	$ 4.7
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4		181.4
Accumulated Amortization	(48.8)		(48.8)		(45.9)
Carrying Value	132.6		132.6		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	(19.9)		(19.9)		(18.4)
Carrying Value	$ 26.1		$ 26.1		$ 27.6