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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Purchases of property, plant and equipment			$ 78.2	$ 21.3
Costs of product/services sold at CEQP and CMLP(2)	$ 113.1	$ 25.4	181.6	66.5
Operations and maintenance expenses charged by CEQP and CMLP	5.0	6.0	9.8	11.7
Related Party Transaction, Due from (to) Related Party [Abstract]
Related party receivables	72.6		72.6		$ 8.2
Related party payables	32.6		32.6		$ 12.0
Revenues	1,448.0	929.6	3,031.8	1,962.3
Product
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	1,215.0	820.7	2,605.5	1,751.3
Service
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	98.8	95.7	194.4	192.9
Applied Consultants, Inc.
Related Party Transaction [Line Items]
Purchases of property, plant and equipment				0.5
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	2.0	13.2	3.6	18.1
Costs of product/services sold at CEQP and CMLP(2)	71.4	14.8	107.6	45.1
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	0.7		1.2
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	0.5	0.3	1.4	11.1
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	134.2	13.2	231.9	18.1
Costs of product/services sold at CEQP and CMLP(2)	113.1	25.4	181.6	66.5
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	7.5	6.6	15.0	12.5
Oasis Petroleum Inc.
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	41.2		72.6
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	0.4	0.0	1.3	0.0
Oasis Petroleum Inc. \| Product
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	76.9		135.9
Oasis Petroleum Inc. \| Service
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	54.6		91.2
Ascent Resources - Utica, LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)		10.3		10.3
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party				0.2
Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Purchases of property, plant and equipment			77.5	21.3
Costs of product/services sold at CEQP and CMLP(2)	113.1	25.4	181.6	66.5
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	1,448.0	929.6	3,031.8	1,962.3
Crestwood Midstream Partners LP \| Product
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	1,215.0	820.7	2,605.5	1,751.3
Crestwood Midstream Partners LP \| Service
Related Party Transaction, Due from (to) Related Party [Abstract]
Revenues	98.8	95.7	194.4	192.9
Crestwood Midstream Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	1.1	1.0	2.2	2.0
Crestwood LTIP \| Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense	8.6	7.6	17.2	14.5
Crestwood LTIP \| Crestwood Holdings
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense				4.6
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP		1.6		3.3
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	1.1	1.2	2.3	2.4
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	$ 3.9	$ 3.2	$ 7.5	$ 6.0