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Financial risk management - Additional information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
FINANCIAL RISK MANAGEMENT |
Description of functional currency | U.S. dollars
Percentage of gains losses on exchange differences on translation recognised in profit or loss | 10.00%
Percentage of changes in differences on commodity price recognised in net earnings and other comprehensive income | 10.00%
At 1 percent change |
FINANCIAL RISK MANAGEMENT |
Interest income | $ 4.8

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