Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 305.5	$ 188.4	$ 100.7
Revenues at CEQP and CMLP	1.0	1.8	2.6
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	28.7	22.3	8.1
Applied Consultants, Inc. [Member]
Related Party Transaction [Line Items]
Payments to Acquire Property, Plant, and Equipment	7.2	2.5
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(1)	56.1
Ascent Resources - Utica, LLC [Member]
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(1)	78.6
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	1.0	1.8	2.6
Costs of product/services sold at CEQP and CMLP(1)	134.7	15.3	17.7
General and administrative expenses charged by CEQP to CMLP, net(3)	20.7	19.4	13.0
CMLP
Related Party Transaction [Line Items]
Payments to Acquire Property, Plant, and Equipment	305.5	188.4	100.7
Revenues at CEQP and CMLP	1.0	1.8	2.6
CMLP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(3)	3.6	3.0	3.0
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP	13.6	5.0
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
Related Party Transaction, (Income) Expenses from Transactions with Related Party	(2.7)	(1.7)	(2.2)
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts receivable at CEQP and CMLP	4.1	7.1
Accounts payable at CEQP	16.1	7.4
Crestwood Long-Term Incentive Plan \| CMLP
Related Party Transaction [Line Items]
Allocated share based compensation expense	24.3	22.4	16.0
Crestwood Long-Term Incentive Plan \| Crestwood Holdings
Related Party Transaction [Line Items]
Allocated share based compensation expense	4.2	3.1	3.2
Stagecoach Gas Services LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	7.9	8.4	5.0
Tres Palacios Holdings LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	3.8	3.5	2.7
Crestwood Permian Basin Holdings
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	15.9	10.0
Jackalope Gas Gathering Services, LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1.1	$ 0.4	$ 0.4

Related Party Transaction, (Income) Expenses from Transactions with Related Party

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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