Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Identifiable intangible assets [Abstract]
Gross Value	$ 5,135.8	$ 5,136.5
Accumulated Amortization	(1,826.7)	(1,687.5)
Carrying Value	3,309.1	3,449.0	$ 3,608.4
Amortization expense	143.2	174.7	170.3
Forecasted amortization expense [Abstract]
2021	144.5
2022	161.3
2023	169.0
2024	165.1
2025	163.5
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	3,080.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	228.0
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	610.4	610.4
Accumulated Amortization	(276.3)	(250.2)
Carrying Value	334.1	360.2
Amortization expense	25.2	31.9	34.7
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8	447.8
Accumulated Amortization	(221.3)	(206.3)
Carrying Value	226.5	241.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	162.6	162.6
Accumulated Amortization	(55.0)	(43.9)
Carrying Value	107.6	118.7
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,478.1	2,480.4
Accumulated Amortization	(541.5)	(478.5)
Carrying Value	1,936.6	2,001.9
Amortization expense	71.5	92.7	87.8
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,195.0	2,203.5
Accumulated Amortization	(291.6)	(243.5)
Carrying Value	1,903.4	1,960.0
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.1	276.9
Accumulated Amortization	(249.9)	(235.0)
Carrying Value	33.2	41.9
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,821.0	1,818.3
Accumulated Amortization	(916.0)	(877.1)
Carrying Value	905.0	941.2
Amortization expense	38.8	41.4	39.1
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3	1,350.3
Accumulated Amortization	(512.2)	(481.6)
Carrying Value	838.1	868.7
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	470.7	468.0
Accumulated Amortization	(403.8)	(395.5)
Carrying Value	66.9	72.5
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	226.3	227.4
Accumulated Amortization	(92.9)	(81.7)
Carrying Value	133.4	145.7
Amortization expense	7.7	8.7	$ 8.7
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4	181.4
Accumulated Amortization	(68.3)	(57.5)
Carrying Value	113.1	123.9
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	44.9	46.0
Accumulated Amortization	(24.6)	(24.2)
Carrying Value	$ 20.3	$ 21.8

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 for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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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