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Exploration in non-operating areas - Additional information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Exploration in non-operating areas |  |  |
Disbursements Of Exploration In Non-Operating Areas | $ 8.5 | $ 11.9 | $ 36.3

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