Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Identifiable intangible assets [Abstract]
Gross Value	$ 4,899.6	$ 5,135.8
Accumulated Amortization	(1,749.0)	(1,826.7)
Carrying Value	3,150.6	3,309.1	$ 3,449.0
Amortization expense	150.9	143.2	174.7
Forecasted amortization expense [Abstract]
2022	169.3
2023	173.5
2024	177.6
2025	174.1
2026	166.6
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	2,960.0
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	192.0
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	613.8	610.4
Accumulated Amortization	(296.6)	(276.3)
Carrying Value	317.2	334.1
Amortization expense	24.3	25.2	31.9
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	447.8	447.8
Accumulated Amortization	(234.5)	(221.3)
Carrying Value	213.3	226.5
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	166.0	162.6
Accumulated Amortization	(62.1)	(55.0)
Carrying Value	103.9	107.6
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,478.1	2,478.1
Accumulated Amortization	(618.1)	(541.5)
Carrying Value	1,860.0	1,936.6
Amortization expense	76.6	71.5	92.7
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,195.0	2,195.0
Accumulated Amortization	(355.5)	(291.6)
Carrying Value	1,839.5	1,903.4
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283.1	283.1
Accumulated Amortization	(262.6)	(249.9)
Carrying Value	20.5	33.2
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,581.4	1,821.0
Accumulated Amortization	(732.7)	(916.0)
Carrying Value	848.7	905.0
Amortization expense	43.1	38.8	41.4
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350.3	1,350.3
Accumulated Amortization	(550.3)	(512.2)
Carrying Value	800.0	838.1
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	231.1	470.7
Accumulated Amortization	(182.4)	(403.8)
Carrying Value	48.7	66.9
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	226.3	226.3
Accumulated Amortization	(101.6)	(92.9)
Carrying Value	124.7	133.4
Amortization expense	6.9	7.7	$ 8.7
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181.4	181.4
Accumulated Amortization	(75.6)	(68.3)
Carrying Value	105.8	113.1
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	44.9	44.9
Accumulated Amortization	(26.0)	(24.6)
Carrying Value	$ 18.9	$ 20.3

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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