Acquisitions and Divestitures (Narrative) (Details) $ in Millions			1 Months Ended			12 Months Ended
	Oct. 01, 2020 USD ($)	Apr. 09, 2019 USD ($)	Apr. 30, 2020 USD ($) Terminals MMBbls	Apr. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 08, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from issuance of non-controlling interest					$ 175.0	$ 1.0	$ 2.8	$ 235.0
Revenues						4,569.0	2,254.3	3,181.9
Net income (loss)						$ (37.4)	$ (15.3)	319.9
Valuation Technique, Discounted Cash Flow
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discount rate		12.00%
Jackalope Gas Gathering Services, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method ownership percentage		50.00%							50.00%
Crestwood Niobrara LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from issuance of non-controlling interest				$ 235.0
Williams Partners LP | Crestwood Niobrara LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional voting interest acquired		50.00%
Percentage of ownership		100.00%
Customer accounts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Weighted average remaining life						22 years
Fayetteville | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Decrease in property, plant and equipment	$ 44.4
Decrease in asset retirement obligation	1.4
Plains All American Pipeline, L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total purchase price			$ 162.0
NGL storage capacity | MMBbls			7
Liquid petroleum gas terminals | Terminals			7
Property, plant and equipment			$ 110.0
Intangible assets			50.0
Estimated fair value of 100% interest in Jackalope			$ 2.0
Plains All American Pipeline, L.P. | Customer accounts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Weighted average remaining life			20 years
Jackalope Gas Gathering Services, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total purchase price		$ 484.6
Property, plant and equipment		532.9
Intangible assets		306.0
Estimated fair value of 100% interest in Jackalope		$ 920.7
Weighted average remaining life							17 years
Transaction costs							$ 2.8
Revenues								70.1
Net income (loss)								$ 20.9
Jackalope Gas Gathering Services, LLC | Crestwood Niobrara LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from issuance of non-controlling interest				$ 235.0
Percentage of ownership		100.00%
Fayetteville | Gathering and Processing South Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration of sale	23.0
Gain (loss) on asset impairment charges	$ 19.9