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Reclamation and closure cost obligations - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Discount rate applied to cash flow projections | 3.00% | 3.30%
Description of inflation rates applied to cash flow projections | 1.60% | 2.10%
Letters Of Credit |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 26.7 | $ 27.5
Surety Bonds |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Exposure to credit risk on loan commitments and financial guarantee contracts | $ 146.2 | $ 134.2

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