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Acquisitions (Narrative) (Details) - LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. $ in Millions | 1 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) | May 31, 2019 MMBoe
Business Acquisition [Line Items] |  |
Proved reserves | MMBoe |  | 67
Cash consideration paid to LLOG | $ 1,236.2 |
Sales Thresholds 2019 to 2022 |  |
Business Acquisition [Line Items] |  |
Contingent consideration, maximum | 200.0 |
First Oil from Development Projects |  |
Business Acquisition [Line Items] |  |
Contingent consideration, maximum | $ 50.0 |

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