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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Basis of Presentation and Summary of Significant Accounting Policies (Goodwill, by Reporting Unit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 09, 2019
Goodwill [Line Items]
Goodwill	$ 80.3
Goodwill [Roll Forward]
Beginning Balance	138.6	$ 147.6
Goodwill Impairments during the Period	0.0	0.0	$ 38.8
Goodwill, Transfers		0.0
Goodwill, Written off Related to Sale of Business Unit	(9.0)
Ending Balance	218.9	138.6	147.6
Goodwill, Other Increase (Decrease)		(9.0)
Arrow
Goodwill [Roll Forward]
Beginning Balance	45.9	45.9
Goodwill Impairments during the Period			0.0
Ending Balance	45.9	45.9	45.9
West Coast
Goodwill [Line Items]
Impairment of intangible assets		0.8
Goodwill [Roll Forward]
Beginning Balance	0.0	0.0
Goodwill Impairments during the Period			2.4
Ending Balance		0.0	0.0
NGL Marketing and Logistics
Goodwill [Roll Forward]
Beginning Balance	92.7
Goodwill, Transfers		101.7
Goodwill, Written off Related to Sale of Business Unit		(9.0)
Ending Balance	92.7	92.7
Supply and Logistics
Goodwill [Roll Forward]
Beginning Balance	0.0	101.7
Goodwill Impairments during the Period			0.0
Goodwill, Transfers		(101.7)
Ending Balance		0.0	101.7
Storage and Terminals
Goodwill [Roll Forward]
Beginning Balance	0.0	0.0
Goodwill Impairments during the Period			36.4
Ending Balance		0.0	0.0
Powder River Basin [Member]
Goodwill [Line Items]
Goodwill	80.3
Goodwill [Roll Forward]
Ending Balance	80.3
CMLP
Goodwill [Roll Forward]
Beginning Balance	138.6
Goodwill Impairments during the Period	0.0	0.0	$ 38.8
Ending Balance	218.9	$ 138.6
Williams Partners LP \| Crestwood Niobrara LLC
Goodwill [Line Items]
Additional voting interest acquired				50.00%
Arrow \| Marketing Supply and Logistics
Goodwill [Line Items]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 4.3