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Inventories (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of inventories |  |
Stockpile ore | $ 45.2 | $ 34.1
Work-in-process | 17.1 | 5.3
Finished goods | 14.4 | 16.8
Supplies | 74.6 | 70.5
Total inventories | 151.3 | 126.7
Less: non-current stockpile inventories | (32.6) | 0.0
Total current inventories | 118.7 | 126.7
Operating expense | 436.3 | 450.4
Reversals of write-downs of inventories | 16.4 | (0.7)
Inventories recognized |  |
Disclosure of inventories |  |
Operating expense | 421.1 | $ 436.2
Low-Grade Stockpile |  |
Disclosure of inventories |  |
Reversals of write-downs of inventories | $ 19.8 |

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