Acquisitions and Divestitures (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 01, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jul. 01, 2022	Apr. 30, 2022	Feb. 28, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill		$ 194.8		$ 194.8					$ 138.6
Revenues		1,448.0	$ 929.6	3,031.8	$ 1,962.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		39.4	(38.1)	61.6	(76.4)
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration							$ 24.7
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		0.1		4.1
Gathering and Processing North
Business Acquisition [Line Items]
Goodwill		48.8		48.8
Gathering and Processing South
Business Acquisition [Line Items]
Goodwill		7.4		7.4
Gathering and Processing South | Barnett Shale Assets | Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				53.3
Gathering and Processing South | Granite Wash | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(7.0)
Crestwood Midstream Partners LP
Business Acquisition [Line Items]
Goodwill		194.8		194.8					$ 138.6
Revenues		1,448.0	929.6	3,031.8	1,962.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(14.6)	(38.5)	5.6	(78.9)
Valuation Technique, Discounted Cash Flow
Business Acquisition [Line Items]
Business Combination Discount Rate								12.00%
Subsequent Event | Gathering and Processing South | Barnett Shale Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration						$ 290.0
Oasis Midstream Partners LP
Business Acquisition [Line Items]
Cash payment	$ 160.0
Business Acquisition, Transaction Costs		18.7		18.7
Cash	14.9
Other current assets	63.2
Property, plant and equipment	1,264.4
Intangible assets	464.0
Total assets acquired	1,806.5
Current liabilities	48.2
Long-term debt	698.7
Other long-term liabilities	25.8
Total liabilities assumed	772.7
Net assets acquired excluding goodwill	1,033.8
Goodwill	56.2
Net assets acquired	$ 1,090.0
Revenues		97.5		164.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 32.8		56.3
Business Acquisition, Pro Forma Revenue			1,024.9	3,066.4	2,157.9
Business Acquisition, Pro Forma Net Income (Loss)			$ (15.5)	$ 67.8	$ (31.1)
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ (420,000)	$ 170,000	$ (800,000)
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ (0.42)	$ 180,000	$ (0.80)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Debt Instrument, Fair Value Adjustment	$ 30.7							$ 30.7
Asset Retirement Obligation	16.1
Consideration transferred	1,800.0
Oasis Midstream Partners LP | Revolving Credit Facility
Business Acquisition [Line Items]
Credit Facility	218.0
Oasis Midstream Partners LP | Crestwood Midstream Partners LP
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue			$ 1,024.9	$ 3,066.4	$ 2,157.9
Business Acquisition, Pro Forma Net Income (Loss)			$ (15.9)	$ 11.8	$ (33.6)
Oasis Midstream Partners LP | Oasis Petroleum Inc.
Business Acquisition [Line Items]
Cash payment	$ 150.0
Issued shares (in shares)	20.9
Stock exchanged (in shares)	33.8
Oasis Midstream Partners LP | Oasis Midstream Partners LP
Business Acquisition [Line Items]
Stock exchanged (in shares)	14.8
Oasis Midstream Partners LP | Oasis Midstream Public Unitholders
Business Acquisition [Line Items]
Issued shares (in shares)	12.9
Oasis Midstream Partners LP | Oasis Petroleum General Partners
Business Acquisition [Line Items]
Cash payment	$ 10.0