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Reclamation and closure cost obligations - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Discount rate applied to cash flow projections | 3.30% | 1.70%
Description of inflation rates applied to cash flow projections | 2.10% | 1.80%
Letters Of Credit |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 27.5 | $ 24.1
Surety Bonds |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 134.2 | $ 134.4

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