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Financial risk management - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2019 | Dec. 10, 2012
Disclosure of risk management [line items] |  |  |  |
Increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real | 1.00% |  |  |
Decrease/increase in profit (loss) before taxes due to 1% increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real | $ 805,000 | $ 675,000 |  |
Percent increase in variable interest rate | 1.00% |  |  |
Increase (decrease) in net earnings on an annualized basis | $ 2,000,000 |  |  |
Maximum exposure to credit risk | $ 251,135,000 |  |  |
Payment for metal sales period description | Payment for metal sales is normally in advance or within fifteen days of shipment depending on the buyer. |  |  |
Senior notes |  |  |  |
Disclosure of risk management [line items] |  |  |  |
Debt fixed interest rate | 9.50% |  |  | 6.125%
Notional amount |  |  |  | $ 600,000,000
Term loan |  |  |  |
Disclosure of risk management [line items] |  |  |  |
Notional amount | $ 200,000,000 |  | $ 200,000,000 |

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