Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	$ 455.5	$ 305.5	$ 188.4
Related Parties Amount in Cost of Sales	45.4	134.7	15.3
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	25.9	28.7	22.3
Applied Consultants, Inc.
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	9.9	7.2
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	2.9	1.0	1.8
Related Parties Amount in Cost of Sales	45.4	134.7	15.3
General and administrative expenses charged by CEQP to CMLP, net(3)	41.4	20.7	19.4
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	19.0	56.1
Ascent Resources - Utica, LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	23.9	78.6
Blue Racer Midstream, LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	0.2
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	2.3
Sabine Oil and Gas
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales			15.3
CMLP
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	455.5	305.5	188.4
Related Parties Amount in Cost of Sales	45.4	134.7	15.3
CMLP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(3)	3.7	3.6	3.0
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP	13.1	13.6
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
Related Party Transaction, (Income) Expenses from Transactions with Related Party	(0.6)	(2.7)	(1.7)
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts receivable at CEQP and CMLP	7.3	4.1
Accounts payable at CEQP	15.6	16.1
Crestwood Long-Term Incentive Plan \| CMLP
Related Party Transaction [Line Items]
Allocated share based compensation expense	45.1	24.3	22.4
Crestwood Long-Term Incentive Plan \| Crestwood Holdings
Related Party Transaction [Line Items]
Allocated share based compensation expense	1.9	4.2	3.1
Stagecoach Gas Services LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	7.5	7.9	8.4
Tres Palacios Holdings LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	4.4	3.8	3.5
Crestwood Permian Basin Holdings
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	13.5	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	$ 0.5	$ 1.1	$ 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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