Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Gathering and processing revenues at CEQP and CMLP	$ 1.8	$ 2.6	$ 3.9
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	22.3	8.1	3.3
Affiliated Entity
Related Party Transaction [Line Items]
Gathering and processing revenues at CEQP and CMLP	1.8	2.6	3.9
Gathering and processing costs of product sold at CEQP and CMLP(1)	15.3	17.7	28.9
General and administrative expenses charged by CEQP to CMLP, net(3)	19.4	13.0	49.5
CMLP
Related Party Transaction [Line Items]
Gathering and processing revenues at CEQP and CMLP	1.8	2.6	3.9
CMLP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(3)	3.0	3.0	0.8
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP	5.0	0.0
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
Related Party Transaction, (Income) Expenses from Transactions with Related Party	(1.7)	(2.2)	0.4
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts receivable at CEQP and CMLP	7.1	5.6
Accounts payable at CEQP	7.4	2.5
Crestwood Long-Term Incentive Plan \| CMLP
Related Party Transaction [Line Items]
Allocated share based compensation expense	22.4	16.0	10.0
Crestwood Long-Term Incentive Plan \| Crestwood Holdings
Related Party Transaction [Line Items]
Allocated share based compensation expense	3.1	3.2	0.1
Stagecoach Gas Services LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	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	3.5	2.7	2.8
Crestwood Permian Basin Holdings
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	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	$ 0.4	$ 0.4	$ 0.5

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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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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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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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 selling, general and administrative expenses 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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