Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Identifiable intangible assets [Abstract]
Gross Value	$ 5,136.5	$ 5,343.5
Accumulated Amortization	(1,687.5)	(1,735.1)
Carrying Value	3,449.0	3,608.4	$ 3,690.3
Amortization expense	174.7	170.3	166.9
Forecasted amortization expense [Abstract]
2020	164.8
2021	167.0
2022	164.0
2023	162.4
2024	158.9
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	3,200.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	254.9
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4	820.7
Accumulated Amortization	(250.2)	(440.6)
Carrying Value	360.2	380.1
Amortization expense	31.9	34.7	28.9
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8	457.3
Accumulated Amortization	(206.3)	(201.9)
Carrying Value	241.5	255.4
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6	363.4
Accumulated Amortization	(43.9)	(238.7)
Carrying Value	118.7	124.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,480.4	2,480.4
Accumulated Amortization	(478.5)	(385.8)
Carrying Value	2,001.9	2,094.6
Amortization expense	92.7	87.8	92.5
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,203.5	2,203.5
Accumulated Amortization	(243.5)	(174.1)
Carrying Value	1,960.0	2,029.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	276.9	276.9
Accumulated Amortization	(235.0)	(211.7)
Carrying Value	41.9	65.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,818.3	1,815.0
Accumulated Amortization	(877.1)	(835.7)
Carrying Value	941.2	979.3
Amortization expense	41.4	39.1	36.2
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3	1,350.3
Accumulated Amortization	(481.6)	(447.8)
Carrying Value	868.7	902.5
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	468.0	464.7
Accumulated Amortization	(395.5)	(387.9)
Carrying Value	72.5	76.8
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	227.4	227.4
Accumulated Amortization	(81.7)	(73.0)
Carrying Value	145.7	154.4
Amortization expense	8.7	8.7	$ 9.3
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4	181.4
Accumulated Amortization	(57.5)	(51.8)
Carrying Value	123.9	129.6
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	46.0	46.0
Accumulated Amortization	(24.2)	(21.2)
Carrying Value	$ 21.8	$ 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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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 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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