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Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 20, 2026 | Feb. 25, 2021 | Dec. 31, 2021 USD ($) contract / $ | Dec. 31, 2020 USD ($) / $ | Dec. 31, 2019 USD ($) | Feb. 24, 2021
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Receivable balance, gross, noncurrent |  |  | $ 9.6 |  |  |
Exchange rate | / $ |  |  | 578.2 | 534.8 |  |
Number of contracts entered into | contract |  |  | 2 |  |  |
Gain (loss) on foreign currency transaction |  |  | $ (0.7) | $ 0.2 | $ (0.2) |
Sasol Gabon S.A. [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Abandonment funding payment due |  |  | 4.3 |  |  |
Consortium [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Receivable balance, gross, noncurrent |  |  | $ 14.5 |  |  |
Prior Production Sharing Contract, Through September 17, 2018 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Monthly royalty rate, based on production at the published price |  |  | 13.00% |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Other receivables |  |  | $ 10.0 |  |  |
Other accounts payable |  |  | 5.4 |  |  |
Other accrued liabilities |  |  | $ 4.6 |  |  |
Etame Marine Block [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage |  | 27.80% |  |  |  |
Working interest ownership, percentage |  | 58.80% |  |  |  | 31.10%
Etame Marine Block [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Monthly royalty rate, based on production at the published price |  |  | 13.00% |  |  |
Working interest ownership, percentage |  |  | 7.50% |  |  |
Etame Marine Block [Member] | Prior Production Sharing Contract, Through September 17, 2018 [Member] | Consortium [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Working interest ownership, percentage |  |  | 7.50% |  |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Working interest ownership, percentage | 10.00% |  |  |  |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 1.60% |  |  |  |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 2.50% |  |  |  |  |
Working interest ownership, percentage | 10.00% |  |  |  |  |

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