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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 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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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	6 Months Ended
	Aug. 14, 2020	Aug. 07, 2020	Jul. 16, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Jul. 31, 2020	Feb. 29, 2020	Apr. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 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				May 15, 2020		Feb. 14, 2020		May 15, 2019		Feb. 14, 2019
Distribution Made to Limited Partner, Date of Record					May 08, 2020		Feb. 07, 2020		May 08, 2019		Feb. 07, 2019
Distributions to preferred unitholders																30.0	$ 30.0
Incentive Distribution, Distribution																91.0	86.2
Distributions to non-controlling partner																18.5	6.6
Distribution Made to Limited Partner, Cash Distributions Paid				$ 45.7		$ 45.3		$ 43.1		$ 43.1						91.0	86.2
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																119.0	117.5
Distributions to non-controlling partner																18.5	6.6
Distribution Made to General Partner, Cash Distributions Paid																119.0	117.5
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																$ 18.5	6.6
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															$ 0.6	$ 0.8
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	Aug. 14, 2020
Distribution Made to Limited Partner, Date of Record		Aug. 07, 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															$ 3.7	$ 3.7
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