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Mineral Property, Plant and Equipment (Acquisition) (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 23, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Net assets acquired |  |  |
Mineral property, plant and equipment |  | $ 3,360.1 | $ 3,173.8
Manitou Gold Inc. |  |  |
Total consideration |  |  |
Fair value of total shares issued (note 13) | $ 13.4 |  |
Fair value of 19% interest in Manitou prior to acquisition | 3.1 |  |
Transaction costs | 0.2 | 0.2 |
Consideration transferred, acquisition-date fair value | 16.7 | $ 16.7 |
Net assets acquired |  |  |
Current liabilities | (1.5) |  |
Decommissioning liabilities | (1.8) |  |
Identifiable assets acquired (liabilities assumed) | 16.7 |  |
Exercise of warrants | 1.1 |  |
Warrants exercised (in shares) |  | 61,683 |
Proceeds from exercise of warrants |  | $ 0.7 |
Mineral property, plant and equipment | $ 20.0 |  |

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