Schedule II - Crestwood Equity Partners LP - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 0.9	$ 0.3	$ 0.3
Valuation Allowances and Reserves, Charged to Cost and Expense	0.6	0.5	0.1
Valuation Allowances and Reserves, Charged to Other Accounts	0.0	0.7	0.0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(0.9)	(0.6)	(0.1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 0.6	$ 0.9	$ 0.3