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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

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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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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Value of units that were previously issued and have been repurchased during the year.

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

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of shares that have been repurchased and retired during the period.

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Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																			1 Months Ended		3 Months Ended			9 Months Ended
	Nov. 14, 2022	Nov. 07, 2022	Oct. 20, 2022	Sep. 15, 2022	Aug. 12, 2022	Aug. 05, 2022	Jul. 11, 2022	May 13, 2022	May 06, 2022	Feb. 14, 2022	Feb. 07, 2022	Feb. 01, 2022	Aug. 13, 2021	Aug. 06, 2021	May 14, 2021	May 07, 2021	Feb. 12, 2021	Feb. 05, 2021	Feb. 28, 2022	Mar. 31, 2021	Sep. 30, 2022	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date					Aug. 12, 2022			May 13, 2022		Feb. 14, 2022			Aug. 13, 2021		May 14, 2021		Feb. 12, 2021
Distribution Made to Limited Partner, Date of Record						Aug. 05, 2022			May 06, 2022		Feb. 07, 2022			Aug. 06, 2021		May 07, 2021		Feb. 05, 2021
Distributions to preferred unitholders																								$ 45.0	$ 45.0
Incentive Distribution, Distribution																								196.7	125.0
Distributions to non-controlling partner																								31.0	29.9
Distribution Made to Limited Partner, Cash Distributions Paid					$ 71.6			$ 64.2		$ 60.9			$ 39.3		$ 39.3		$ 46.4							196.7	125.0
Noncash Distribution to Parent																									2.4
Partners' Capital Account, Treasury Units, Purchased				$ 123.7																$ 268.0
Oasis Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Cash payment												$ 160.0
Common Units
Distribution Made to Limited Partner [Line Items]
Stock exchanged (in shares)				4,600,000																11,500,000
Treasury Stock, Shares, Retired																					4,600,000		11,500,000
Subordinated Units
Distribution Made to Limited Partner [Line Items]
Stock exchanged (in shares)																				400,000
Treasury Stock, Shares, Retired																							400,000
Crestwood Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution																								537.6	451.3
Distributions to non-controlling partner																								31.0	29.9
Distribution Made to General Partner, Cash Distributions Paid																								$ 537.6	451.3
Crestwood Permian Basin Holdings LLC
Distribution Made to Limited Partner [Line Items]
Business Acquisition, Percentage of Additional Voting Interests Acquired							50.00%
Crestwood Permian Basin Holdings LLC \| First Reserve Management, L.P.
Distribution Made to Limited Partner [Line Items]
Business Acquisition, Percentage of Additional Voting Interests Acquired							50.00%
Common unit
Distribution Made to Limited Partner [Line Items]
Transaction Costs																									$ 7.6
Partners' Capital Account, Treasury Units, Purchased																					$ 123.7
Partners' Capital
Distribution Made to Limited Partner [Line Items]
Partners' Capital Account, Treasury Units, Purchased																					123.7
Partners' Capital \| Crestwood Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Non-cash contribution from partner (Note 11)							$ 127.3					1,075.1									127.3	$ 1,075.1
Cash contribution from partner (Note 11)							$ 149.4					$ 14.9									149.4	$ 14.9
Common Units
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																								526,322
Oasis Midstream Public Unitholders \| Oasis Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Issued shares (in shares)												12,900,000
Oasis Petroleum Inc. \| Oasis Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Issued shares (in shares)												20,900,000
Cash payment												$ 150.0
First Reserve Management, L.P. \| Crestwood Permian Basin Holdings LLC
Distribution Made to Limited Partner [Line Items]
Issued shares (in shares)							11,300,000
Cash payment							$ 5.9
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date	Nov. 14, 2022
Distribution Made to Limited Partner, Date of Record		Nov. 07, 2022
Distributions to preferred unitholders			$ 15.0
Cash Distribution \| Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.655
Crestwood LTIP
Distribution Made to Limited Partner [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount																					3.8			$ 3.8
Crestwood LTIP \| Performance Shares
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																			177,025					206,017
Share-based Payment Arrangement, Noncash Expense																					$ 0.4			$ 1.1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																								3 years