Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Identifiable intangible assets [Abstract]
Gross Value	$ 5,345.2		$ 5,343.5
Accumulated Amortization	(1,779.3)		(1,735.1)
Carrying Value	3,565.9		3,608.4
Amortization expense	44.2	$ 43.1
Forecasted amortization expense [Abstract]
Remainder of 2019	124.3
2020	160.2
2021	162.4
2022	168.0
2023	168.1
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	820.7		820.7
Accumulated Amortization	(449.7)		(440.6)
Carrying Value	371.0		380.1
Amortization expense	9.1	7.1
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	457.3		457.3
Accumulated Amortization	(205.4)		(201.9)
Carrying Value	251.9		255.4
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	363.4		363.4
Accumulated Amortization	(244.3)		(238.7)
Carrying Value	119.1		124.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4		2,480.4
Accumulated Amortization	(407.8)		(385.8)
Carrying Value	2,072.6		2,094.6
Amortization expense	22.0	24.0
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5		2,203.5
Accumulated Amortization	(189.7)		(174.1)
Carrying Value	2,013.8		2,029.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	276.9		276.9
Accumulated Amortization	(218.1)		(211.7)
Carrying Value	58.8		65.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,816.7		1,815.0
Accumulated Amortization	(846.6)		(835.7)
Carrying Value	970.1		979.3
Amortization expense	10.9	9.7
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3		1,350.3
Accumulated Amortization	(456.9)		(447.8)
Carrying Value	893.4		902.5
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	466.4		464.7
Accumulated Amortization	(389.7)		(387.9)
Carrying Value	76.7		76.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4		227.4
Accumulated Amortization	(75.2)		(73.0)
Carrying Value	152.2		154.4
Amortization expense	2.2	$ 2.3
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4		181.4
Accumulated Amortization	(53.2)		(51.8)
Carrying Value	128.2		129.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0		46.0
Accumulated Amortization	(22.0)		(21.2)
Carrying Value	$ 24.0		$ 24.8

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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-Name Accounting Standards Codification
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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 fourth 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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