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Distribution Made to General Partner, Cash Distributions Paid

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Equity Offering Program Authorized Amount

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

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

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Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-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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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 cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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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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 issued under 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
	Nov. 13, 2020	Nov. 06, 2020	Oct. 15, 2020	Aug. 14, 2020	Aug. 07, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Oct. 31, 2020	Feb. 29, 2020	Apr. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Apr. 09, 2019
Distribution Made to Limited Partner [Line Items]
Equity Offering Program Authorized Amount																				$ 250.0
Distribution Made to Limited Partner, Distribution Date				Aug. 14, 2020		May 15, 2020		Feb. 14, 2020		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019
Distribution Made to Limited Partner, Date of Record					Aug. 07, 2020		May 08, 2020		Feb. 07, 2020		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019
Distributions to preferred unitholders																				45.0	$ 45.0
Incentive Distribution, Distribution																				136.7	129.3
Distributions to non-controlling partner																				27.8	15.8
Distribution Made to Limited Partner, Cash Distributions Paid				$ 45.7		$ 45.7		$ 45.3		$ 43.1		$ 43.1		$ 43.1						136.7	129.3
Net proceeds from issuance of non-controlling interest																				2.8	235.0
Crestwood Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution																				180.9	177.3
Distributions to non-controlling partner																				27.8	15.8
Distribution Made to General Partner, Cash Distributions Paid																				180.9	177.3
Net proceeds from issuance of non-controlling interest																				2.8	235.0
Crestwood Niobrara LLC
Distribution Made to Limited Partner [Line Items]
Distributions to non-controlling partner																				$ 27.8	15.8
Net proceeds from issuance of non-controlling interest																		$ 235.0
Performance Shares
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																	184,528			405,620
Share-based Payment Arrangement, Noncash Expense																			$ 0.3	$ 1.1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	3 years
Common Units
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																				838,556
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date	Nov. 13, 2020
Distribution Made to Limited Partner, Date of Record		Nov. 06, 2020
Distributions to preferred unitholders			$ 15.0
Subsequent Event \| Crestwood Niobrara LLC
Distribution Made to Limited Partner [Line Items]
Distributions to non-controlling partner																$ 9.3
Cash Distribution \| Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.625
Crestwood LTIP
Distribution Made to Limited Partner [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount																			$ 3.1	$ 3.1
Williams Partners LP \| Crestwood Niobrara LLC
Distribution Made to Limited Partner [Line Items]
Additional voting rights acquired																						50.00%
Series A-3
Distribution Made to Limited Partner [Line Items]
Net proceeds from issuance of non-controlling interest																		$ 235.0			$ 235.0
Non-Controlling Partners
Distribution Made to Limited Partner [Line Items]
Net proceeds from issuance of non-controlling interest																				$ 2.8