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Business Acquisition, Percentage of Voting Interest After Acquisition

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability exceeding amount recognized at acquisition date. Includes, but is not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Jan. 31, 2022	Nov. 30, 2021	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020	Apr. 09, 2019	Apr. 08, 2019
Schedule of Equity Method Investments [Line Items]
Contributions(2)				$ 17.6	$ 9.4	$ 61.3
Investments in unconsolidated affiliates				155.8	943.7
Contingent consideration				0.0	38.0
Earnings (loss) from unconsolidated affiliates, net				(120.4)	32.5	32.8
Net proceeds from sale of long-lived assets, including equity investments				17.7	27.3	0.8
Distributions(1)				672.7	78.4	75.2
Contingent consideration - current portion				0.0	19.0
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates				0.0	0.0
Earnings (loss) from unconsolidated affiliates, net				0.0	0.0	3.7
Amortization						0.1
Equity method ownership percentage								50.00%	50.00%
Distributions(1)				0.0	0.0	11.6
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)				6.9	6.0	6.3
Investments in unconsolidated affiliates				36.2	35.5
Earnings (loss) from unconsolidated affiliates, net				9.3	0.0	0.9
Difference between carrying amount and underlying equity				21.4
Amortization				$ 1.3	1.3	1.3
Equity method ownership percentage				50.01%
Distributions(1)				$ 15.5	6.4	6.3
Tres Palacios Holdings LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Contributions(2)	$ 6.0
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)				0.0	0.0	0.2
Investments in unconsolidated affiliates				3.5	3.6
Earnings (loss) from unconsolidated affiliates, net				(0.1)	(4.3)	(0.2)
Difference between carrying amount and underlying equity				$ 5.5
Amortization						0.4
Equity method ownership percentage				50.01%
Distributions(1)				$ 0.0	0.4	0.0
Crestwood Permian Basin Holdings \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Distributions(1)	8.5
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity				8.2
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)				0.0	0.0	2.1
Investments in unconsolidated affiliates				0.0	792.5
Earnings (loss) from unconsolidated affiliates, net				(139.2)	37.8	34.2
Difference between carrying amount and underlying equity				$ 51.3
Equity method ownership percentage				0.00%
Distributions(1)			$ 613.9	$ 640.9	59.7	52.3
Proceeds from Sale of Equity Method Investments		$ 15.4	1,195.0
Equity Method Investment, Transaction Costs			3.0	3.1
Payment for Contingent Consideration Liability, Operating Activities			$ 40.0	57.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities				2.1
Stagecoach Gas Services LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from unconsolidated affiliates, net				155.6
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)				10.7	3.4	28.3
Investments in unconsolidated affiliates				116.1	112.1
Earnings (loss) from unconsolidated affiliates, net				$ 9.6	(1.0)	(5.8)
Equity method ownership percentage				50.00%			50.00%
Distributions(1)				$ 16.3	11.9	5.0
Crestwood Permian Basin Holdings LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Contributions(2)	$ 8.5
Jackalope Gas Gathering Services, LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates								$ 226.7
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)				0.0	0.0	24.4
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership								100.00%
CMLP
Schedule of Equity Method Investments [Line Items]
Contributions(2)				17.6	9.4	61.3
Investments in unconsolidated affiliates				155.8	943.7
Contingent consideration				0.0	38.0
Earnings (loss) from unconsolidated affiliates, net				(120.4)	32.5	32.8
Net proceeds from sale of long-lived assets, including equity investments				17.7	27.3	$ 0.8
Contingent consideration - current portion				$ 0.0	$ 19.0
Williams Partners LP \| Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Additional voting interest acquired								50.00%
Percentage of ownership								100.00%