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Distribution Made to General Partner, Cash Distributions Paid

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Equity Interest

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Maximum Value of Common Units to be Issued Under Optional Redemption

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Partners' Capital, Contingent Distribution Amount Per Share

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Partner's Capital, Unpaid Distribution, Accrual Percentage

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Transaction Costs

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Date of record for distribution of cash or unit to limited partner of limited partnership (LP), in YYYY-MM-DD format.

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Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in YYYY-MM-DD format.

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Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

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Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

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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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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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The number of limited partner units issued.

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The distribution amount per share for all classes of units.

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The cash outflow to reacquire common stock during the period.

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Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends.

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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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 number of preferred units issued.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Partners' Capital and Non-Controlling Partner (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																											1 Months Ended				12 Months Ended
	Feb. 14, 2022	Feb. 07, 2022	Nov. 12, 2021	Nov. 05, 2021	Aug. 13, 2021	Aug. 06, 2021	May 14, 2021	May 07, 2021	Feb. 12, 2021	Feb. 05, 2021	Nov. 13, 2020	Nov. 06, 2020	Aug. 14, 2020	Aug. 07, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Nov. 14, 2019	Nov. 07, 2019	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Jan. 31, 2022	Mar. 31, 2021	Apr. 30, 2019	Dec. 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Apr. 09, 2019	Apr. 08, 2019
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date			Nov. 12, 2021		Aug. 13, 2021		May 14, 2021		Feb. 12, 2021		Nov. 13, 2020		Aug. 14, 2020		May 15, 2020		Feb. 14, 2020		Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019
Maximum Period For Distribution Of Available Cash																															45 days
Per unit rate, in dollars per unit			$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distributions to partners																															$ (164.3)	$ (182.7)	$ (172.4)
Contributions(2)																															17.6	9.4	61.3
Distributions paid to non-controlling partners																															$ 40.2	$ 37.1	25.0
Limited partners' units, issued																															62,991,511	73,970,208
Preferred units, outstanding (in units)																															71,257,445	71,257,445
Preferred units, issued																															71,257,445	71,257,445
Distributions to preferred unitholders																															$ 60.1	$ 60.1	60.1
Distribution to limited partner, record date				Nov. 05, 2021		Aug. 06, 2021		May 07, 2021		Feb. 05, 2021		Nov. 06, 2020		Aug. 07, 2020		May 08, 2020		Feb. 07, 2020		Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019
Proceeds from Noncontrolling Interests																														$ 175.0	1.0	2.8	235.0
Maximum Value of Common Units to be Issued Under Optional Redemption																															100.0
Payments to acquire units																												$ 268.0			275.6	0.0	0.0
Common units
Distribution Made to Member or Limited Partner [Line Items]
Shares acquired (in shares)																												11,500,000
Subordinated units
Distribution Made to Member or Limited Partner [Line Items]
Shares acquired (in shares)																												400,000
Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distributions to preferred unitholders	$ 15.0
Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Proceeds from Noncontrolling Interests																													$ 235.0
Crestwood Niobrara LLC \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																															40.2	37.1	25.0
Crestwood Niobrara LLC \| Subsequent Event \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																											$ 10.3
CMLP
Distribution Made to Member or Limited Partner [Line Items]
Distributions to partners																															(509.7)	(242.6)	(235.8)
Contributions(2)																															17.6	9.4	61.3
Distributions paid to non-controlling partners																															40.2	37.1	25.0
Distribution Made to General Partner, Cash Distributions Paid																															509.7	242.6	235.8
Proceeds from Noncontrolling Interests																															1.0	2.8	235.0
Tres Palacios Holdings LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions(2)																															$ 6.9	6.0	6.3
Equity method ownership percentage																															50.01%
Tres Palacios Holdings LLC \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Contributions(2)																											$ 6.0
Jackalope Gas Gathering Services, LLC
Distribution Made to Member or Limited Partner [Line Items]
Equity method ownership percentage																																		50.00%	50.00%
Equity Interest																													50.00%		50.00%
Jackalope Gas Gathering Services, LLC \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions(2)																															$ 0.0	$ 0.0	$ 24.4
Cash distribution \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distribution declared per limited partner unit	$ 0.625
Distribution to limited partner, record date		Feb. 07, 2022
Preferred Partner
Distribution Made to Member or Limited Partner [Line Items]
Partners' Capital, Distribution Amount Per Share																															$ 0.2567
Partners' Capital, Contingent Distribution Amount Per Share																															$ 0.2111
Partner's Capital, Unpaid Distribution, Accrual Percentage																															2.8125%
Common Unit Capital
Distribution Made to Member or Limited Partner [Line Items]
Transaction Costs																															$ 7.6
Williams Partners LP \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Additional voting interest acquired																																		50.00%