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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Summary Of Significant Accounting Policies [Line Items]
Investments in unconsolidated affiliates	$ 155.8	$ 943.7
Gain (loss) on property, plant and equipment	(39.6)	(26.0)	$ (6.2)
Goodwill impairment	$ 0.0	80.3	0.0
Percentage of gross income from qualifying sources required to be subject to federal income tax, minimum	90.00%
Deferred Financing Costs Weighted Average Remaining Life	6 years
Measurement Input, Discount Rate
Summary Of Significant Accounting Policies [Line Items]
Long-lived measurement input	12.00%
Fayetteville
Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on property, plant and equipment		19.9
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts				$ 0.7
Partners' capital				$ 0.7
CMLP
Summary Of Significant Accounting Policies [Line Items]
Partners' capital	$ (1,232.3)	(1,805.1)
Investments in unconsolidated affiliates	155.8	943.7
Gain (loss) on property, plant and equipment	(39.4)	(26.0)	(6.2)
Goodwill impairment	0.0	80.3	0.0
Accumulated goodwill impairment	1,479.6
Crestwood Equity Partners LP
Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on property, plant and equipment	(0.2)
Accumulated goodwill impairment	1,736.8
Crestwood Permian Basin Holdings LLC
Summary Of Significant Accounting Policies [Line Items]
Investments in unconsolidated affiliates	$ 116.1	112.1
Equity method ownership percentage	50.00%			50.00%
Crestwood Permian Basin Holdings LLC \| Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Partners' capital				$ (0.2)
Investments in unconsolidated affiliates				$ 0.2
Gathering and Processing South Segment \| Marcellus
Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on asset impairment charges	$ 40.1
Arrow \| Gathering and Processing North Segment
Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on asset impairment charges		$ 3.1	$ 4.3