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Share capital - Common shares issued and outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of classes of share capital [abstract] |  |  |
Beginning balance (in shares) |  | 687,006 | 682,277
Common shares, beginning of period |  | $ 3,163.5 | $ 3,157.1
Issuance of common shares (in shares) | 100,395 | 100,395 |
Issuance of common shares |  | $ 164.6 |
Issuance of common shares under First Nations agreements (in shares) |  | 2,400 | 181
Issuance of shares under First Nations agreements and land purchases |  | $ 3.9 | $ 0.1
Issuance of flow through shares (in shares) |  |  | 1,642
Issuance of flow through shares |  |  | $ 2.3
Exercise of options and vested performance share units (in shares) |  | 1,129 | 2,906
Exercise of options and vested performance share units |  | $ 2.5 | $ 4.0
Ending balance (in shares) |  | 790,930 | 687,006
Common shares, end of period |  | $ 3,334.5 | $ 3,163.5
Issuance of ordinary shares, price per share (in dollars per share) | $ 1.72 |  |
Proceeds received from issuance of common shares (net of transaction costs) | $ 172.7 |  |
Transaction costs | $ 8.1 |  |

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