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Non-current derivative financial liabilities - Change in free cash flow interest obligation (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair Value of Original Agreement |  | $ 217.2 | $ 743.3 | $ 553.6
Unrealized loss on revaluation of liability |  | 142.8 |  |
Cash consideration |  | (257.5) | 0.0 |
Amending Agreement change of control liability |  | (42.6) | (75.7) |
Transfer of Accumulated Other Comprehensive income on New Afton free cash flow obligation extinguishment |  | 114.5 |  |
Amending Agreement |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gain on extinguishment | $ 42.3 |  |  |
New Afton |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Fair Value of Original Agreement | 634.6 | 0.0 | 543.4 | $ 378.9
Unrealized loss on revaluation of liability |  | 91.2 |  |
Cash consideration |  | (257.5) |  |
Partial disposition of mining interest at New Afton | (272.2) |  |  |
Amending Agreement change of control liability |  | 0.0 | $ (42.7) |
Gain on extinguishment | $ 42.3 |  |  |
New Afton | Amending Agreement |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Amending Agreement change of control liability |  | $ (20.0) |  |

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