Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 218.9
Goodwill, Impairment Loss	80.3	$ 0.0
Goodwill, ending balance	$ 138.6
Crestwood Permian Basin Holdings LLC
Goodwill [Roll Forward]
Ownership percentage	50.00%
Accounting Standards Update 2016-13
Goodwill [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0.7
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	0.7
Accounting Standards Update 2016-13 \| Crestwood Permian Basin Holdings LLC
Goodwill [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	0.2
Arrow
Goodwill [Roll Forward]
Goodwill, beginning balance	45.9
Goodwill, Impairment Loss	0.0
Goodwill, ending balance	45.9
Powder River Basin
Goodwill [Roll Forward]
Goodwill, beginning balance	80.3
Goodwill, Impairment Loss	80.3
Goodwill, ending balance	0.0
NGL Marketing and Logistics
Goodwill [Roll Forward]
Goodwill, beginning balance	92.7
Goodwill, Impairment Loss	0.0
Goodwill, ending balance	$ 92.7

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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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