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

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Amount of noncash expense for share-based payment arrangement.

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Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																			1 Months Ended		3 Months Ended			9 Months Ended
	Oct. 31, 2023	Oct. 23, 2023	Oct. 12, 2023	Aug. 14, 2023	Aug. 07, 2023	May 15, 2023	May 08, 2023	Feb. 14, 2023	Feb. 07, 2023	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	Oct. 31, 2023	Feb. 28, 2023	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Distribution Made to Limited Partner [Line Items]
Payment Date				Aug. 14, 2023		May 15, 2023		Feb. 14, 2023			Aug. 12, 2022			May 13, 2022		Feb. 14, 2022
Record Date					Aug. 07, 2023		May 08, 2023		Feb. 07, 2023			Aug. 05, 2022			May 06, 2022		Feb. 07, 2022
Distributions to preferred unitholders																								$ 45.1	$ 45.0
Distribution Made to Limited Partner, Cash Distributions Paid				$ 68.9		$ 68.9		$ 68.9			$ 71.6			$ 64.2		$ 60.9								$ 206.7	196.7
Partners' Capital Account, Treasury Units, Purchased										$ 123.7
Change of Control Redemption Price Percentage of Liquidation Value																					105.00%			105.00%
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
Crestwood Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Distribution Made to General Partner, Cash Distributions Paid																								$ 264.8	537.6
Crestwood Permian Basin Holdings LLC
Distribution Made to Limited Partner [Line Items]
Equity interest percentage													50.00%
Crestwood Permian Basin Holdings LLC \| First Reserve Management, L.P.
Distribution Made to Limited Partner [Line Items]
Equity interest percentage													50.00%
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]
Partners' Capital Account, Non-Cash Contributions													$ 127.3					1,075.1				127.3	$ 1,075.1
Partners' Capital Account, Contributions													$ 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																								217,702
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
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]
Payment Date	Oct. 31, 2023
Record Date		Oct. 23, 2023
Distributions to preferred unitholders			$ 15.0
Subsequent Event \| Crestwood Niobrara LLC
Distribution Made to Limited Partner [Line Items]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders																			$ 10.3
Cash Distribution \| Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.655
Cash Distribution \| Subsequent Event \| Energy Transfer LP
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			0.003
Cash Distribution \| Subsequent Event \| Preferred Units \| Energy Transfer LP
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.0003
Crestwood LTIP
Distribution Made to Limited Partner [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount																					$ 4.5			$ 4.5
Crestwood LTIP \| Performance Shares
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																				245,929				161,278
Share-based Payment Arrangement, Noncash Expense																					$ 0.5			$ 1.9
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																								3 years
Non-Controlling Partners
Distribution Made to Limited Partner [Line Items]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders																								$ 31.0	$ 31.0