Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Identifiable intangible assets [Abstract]
Gross Value	$ 5,343.5	$ 5,255.1
Accumulated Amortization	(1,735.1)	(1,564.8)
Carrying Value	3,608.4	3,690.3	$ 3,864.1
Amortization expense	170.3	166.9	171.3
Forecasted amortization expense [Abstract]
2019	167.1
2020	159.8
2021	162.1
2022	167.6
2023	167.8
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	3,320.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	291.5
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	820.7	728.2
Accumulated Amortization	(440.6)	(405.9)
Carrying Value	380.1	322.3
Amortization expense	34.7	28.9	30.6
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	457.3	447.4
Accumulated Amortization	(201.9)	(187.5)
Carrying Value	255.4	259.9
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	363.4	280.8
Accumulated Amortization	(238.7)	(218.4)
Carrying Value	124.7	62.4
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4	2,484.5
Accumulated Amortization	(385.8)	(298.0)
Carrying Value	2,094.6	2,186.5
Amortization expense	87.8	92.5	98.4
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5	2,203.5
Accumulated Amortization	(174.1)	(127.0)
Carrying Value	2,029.4	2,076.5
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	276.9	281.0
Accumulated Amortization	(211.7)	(171.0)
Carrying Value	65.2	110.0
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,815.0	1,815.0
Accumulated Amortization	(835.7)	(796.6)
Carrying Value	979.3	1,018.4
Amortization expense	39.1	36.2	33.2
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3	1,350.3
Accumulated Amortization	(447.8)	(417.1)
Carrying Value	902.5	933.2
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	464.7	464.7
Accumulated Amortization	(387.9)	(379.5)
Carrying Value	76.8	85.2
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4	227.4
Accumulated Amortization	(73.0)	(64.3)
Carrying Value	154.4	163.1
Amortization expense	8.7	9.3	$ 9.1
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4	181.4
Accumulated Amortization	(51.8)	(45.9)
Carrying Value	129.6	135.5
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0	46.0
Accumulated Amortization	(21.2)	(18.4)
Carrying Value	$ 24.8	$ 27.6

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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-Publisher FASB
-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 during the next 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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