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Divestitures (Details) - Held-for-sale - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 17, 2018 | Jun. 30, 2018 | Dec. 31, 2018
Williston Non-Op Divestiture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net gain (loss) on disposal |  |  | $ 18.1
Foreman Butte Divestiture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net gain (loss) on disposal |  |  | $ (10.7)
Impairment loss |  | $ 383.4 |
Other WIlliston Divestiture |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net gain (loss) on disposal | $ 19.0 |  |

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