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Mining interests - Schedule of property, plant and equipment (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Mining Interests |  |  |
Beginning balance |  | $ 1,927.2 |
Ending balance |  | 1,687.1 | $ 1,927.2
Ontario Teachers' Pension Plan | Amending Agreement - Ontario Teachers' Pension Plan |  |  |
Mining Interests |  |  |
Disposals of mineral property interest | $ (272.2) |  |
New Afton |  |  |
Mining Interests |  |  |
Beginning balance |  | 1,032.3 |
Ending balance |  | 843.8 | 1,032.3
Rainy River |  |  |
Mining Interests |  |  |
Beginning balance |  | 890.4 |
Ending balance |  | 839.4 | 890.4
COST |  |  |
Mining Interests |  |  |
Beginning balance |  | 4,064.8 | 3,763.6
Additions |  | 247.4 | 310.2
Disposals |  | (7.0) | (9.0)
Transfers |  | 0.0 | 0.0
Disposals of mineral property interest |  | (608.3) |
Ending balance |  | 3,696.9 | 4,064.8
ACCUMULATED DEPRECIATION |  |  |
Mining Interests |  |  |
Beginning balance |  | (2,137.6) | (1,899.7)
Disposals |  | 8.4 | 8.1
Depreciation for the period |  | 216.7 | 246.0
Disposals of mineral property interest |  | (336.1) |
Ending balance |  | (2,009.8) | (2,137.6)
Depletable |  |  |
Mining Interests |  |  |
Beginning balance |  | 755.1 |
Ending balance |  | 1,142.8 | 755.1
Depletable | New Afton |  |  |
Mining Interests |  |  |
Beginning balance |  | 373.5 |
Ending balance |  | 684.6 | 373.5
Depletable | Rainy River |  |  |
Mining Interests |  |  |
Beginning balance |  | 381.6 |
Ending balance |  | 458.2 | 381.6
Depletable | COST |  |  |
Mining Interests |  |  |
Beginning balance |  | 2,001.2 | 1,906.3
Additions |  | 106.5 | 45.0
Disposals |  | 0.0 | 0.0
Transfers |  | 541.1 | 49.9
Disposals of mineral property interest |  | (324.2) |
Ending balance |  | 2,324.6 | 2,001.2
Depletable | COST | C-Zone Development |  |  |
Mining Interests |  |  |
Transfers |  | 232.3 |
Depletable | ACCUMULATED DEPRECIATION |  |  |
Mining Interests |  |  |
Beginning balance |  | (1,246.1) | (1,108.9)
Disposals |  | 0.0 | 0.0
Depreciation for the period |  | 169.1 | 137.2
Disposals of mineral property interest |  | (233.4) |
Ending balance |  | (1,181.8) | (1,246.1)
Non- depletable |  |  |
Mining Interests |  |  |
Beginning balance |  | 367.2 |
Ending balance |  | 4.0 | 367.2
Non- depletable | New Afton |  |  |
Mining Interests |  |  |
Beginning balance |  | 359.9 |
Ending balance |  | 0.0 | 359.9
Non- depletable | Rainy River |  |  |
Mining Interests |  |  |
Beginning balance |  | 6.2 |
Ending balance |  | 2.9 | 6.2
Non- depletable | COST |  |  |
Mining Interests |  |  |
Beginning balance |  | 367.2 | 237.9
Additions |  | 18.0 | 147.9
Disposals |  | 0.0 | 0.0
Transfers |  | (271.0) | (18.6)
Disposals of mineral property interest |  | (110.2) |
Ending balance |  | 4.0 | 367.2
Non- depletable | COST | Rainy River |  |  |
Mining Interests |  |  |
Transfers |  |  | 18.6
Non- depletable | ACCUMULATED DEPRECIATION |  |  |
Mining Interests |  |  |
Beginning balance |  | 0.0 | 0.0
Disposals |  | 0.0 | 0.0
Depreciation for the period |  | 0.0 | 0.0
Disposals of mineral property interest |  | 0.0 |
Ending balance |  | 0.0 | 0.0
Plant & equipment |  |  |
Mining Interests |  |  |
Beginning balance |  | 692.4 |
Ending balance |  | 358.2 | 692.4
Plant & equipment | New Afton |  |  |
Mining Interests |  |  |
Beginning balance |  | 275.2 |
Ending balance |  | 78.1 | 275.2
Plant & equipment | Rainy River |  |  |
Mining Interests |  |  |
Beginning balance |  | 413.8 |
Ending balance |  | 277.3 | 413.8
Plant & equipment | COST |  |  |
Mining Interests |  |  |
Beginning balance |  | 1,583.9 | 1,530.3
Additions |  | 51.4 | 17.1
Disposals |  | (7.0) | (9.0)
Transfers |  | (268.2) | 45.5
Disposals of mineral property interest |  | (173.9) |
Ending balance |  | 1,186.2 | 1,583.9
Plant & equipment | ACCUMULATED DEPRECIATION |  |  |
Mining Interests |  |  |
Beginning balance |  | (891.5) | (790.8)
Disposals |  | 8.4 | 8.1
Depreciation for the period |  | 47.7 | 108.8
Disposals of mineral property interest |  | (102.7) |
Ending balance |  | (828.0) | (891.5)
Construction in progress |  |  |
Mining Interests |  |  |
Beginning balance |  | 112.5 |
Ending balance |  | 182.1 | 112.5
Construction in progress | New Afton |  |  |
Mining Interests |  |  |
Beginning balance |  | 23.7 |
Ending balance |  | 81.1 | 23.7
Construction in progress | Rainy River |  |  |
Mining Interests |  |  |
Beginning balance |  | 88.8 |
Ending balance |  | 101.0 | 88.8
Construction in progress | COST |  |  |
Mining Interests |  |  |
Beginning balance |  | 112.5 | 89.1
Additions |  | 71.5 | 100.2
Disposals |  | 0.0 | 0.0
Transfers |  | (1.9) | (76.8)
Disposals of mineral property interest |  | 0.0 |
Ending balance |  | 182.1 | 112.5
Construction in progress | ACCUMULATED DEPRECIATION |  |  |
Mining Interests |  |  |
Beginning balance |  | 0.0 | 0.0
Disposals |  | 0.0 | 0.0
Depreciation for the period |  | 0.0 | 0.0
Disposals of mineral property interest |  | 0.0 |
Ending balance |  | $ 0.0 | $ 0.0

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