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Reclamation and closure cost obligations - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Discount rate applied to cash flow projections | 1.70% | 1.20%
Description of inflation rates applied to cash flow projections | 1.80% | 1.50%
Letters Of Credit |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 24.1 | $ 46.0
Surety Bonds |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 134.4 | $ 102.6

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