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Mining interests - Schedule of property, plant and equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Mining Interests |  |
Beginning balance | $ 1,863.9 |
Ending balance | 1,927.2 | $ 1,863.9
New Afton |  |
Mining Interests |  |
Beginning balance | 922.4 |
Ending balance | 1,032.3 | 922.4
Rainy River |  |
Mining Interests |  |
Beginning balance | 939.3 |
Ending balance | 890.4 | 939.3
Gross carrying amount |  |
Mining Interests |  |
Beginning balance | 3,763.6 | 3,487.3
Additions | 310.2 | 283.5
Disposals | (9.0) | (7.2)
Transfers | 0.0 | 0.0
Ending balance | 4,064.8 | 3,763.6
Accumulated depreciation and amortisation |  |
Mining Interests |  |
Beginning balance | (1,899.7) | (1,699.4)
Disposals | 8.1 | 4.3
Depreciation for the period | 246.0 | 204.6
Ending balance | (2,137.6) | (1,899.7)
Depletable |  |
Mining Interests |  |
Beginning balance | 797.4 |
Ending balance | 755.1 | 797.4
Depletable | New Afton |  |
Mining Interests |  |
Beginning balance | 402.8 |
Ending balance | 373.5 | 402.8
Depletable | Rainy River |  |
Mining Interests |  |
Beginning balance | 394.6 |
Ending balance | 381.6 | 394.6
Depletable | Gross carrying amount |  |
Mining Interests |  |
Beginning balance | 1,906.3 | 1,745.9
Additions | 45.0 | 81.7
Disposals | 0.0 | (0.2)
Transfers | 49.9 | 78.9
Ending balance | 2,001.2 | 1,906.3
Depletable | Accumulated depreciation and amortisation |  |
Mining Interests |  |
Beginning balance | (1,108.9) | (1,005.7)
Disposals | 0.0 | 0.1
Depreciation for the period | 137.2 | 103.3
Ending balance | (1,246.1) | (1,108.9)
Non- depletable |  |
Mining Interests |  |
Beginning balance | 237.9 |
Ending balance | 367.2 | 237.9
Non- depletable | New Afton |  |
Mining Interests |  |
Beginning balance | 230.9 |
Ending balance | 359.9 | 230.9
Non- depletable | Rainy River |  |
Mining Interests |  |
Beginning balance | 5.9 |
Ending balance | 6.2 | 5.9
Non- depletable | Gross carrying amount |  |
Mining Interests |  |
Beginning balance | 237.9 | 261.0
Additions | 147.9 | 109.3
Disposals | 0.0 | 0.0
Transfers | (18.6) | (132.4)
Ending balance | 367.2 | 237.9
Non- depletable | Gross carrying amount | New Afton |  |
Mining Interests |  |
Transfers |  | (84.8)
Non- depletable | Gross carrying amount | Rainy River |  |
Mining Interests |  |
Transfers | (18.6) | (47.6)
Non- depletable | Accumulated depreciation and amortisation |  |
Mining Interests |  |
Beginning balance | 0.0 | 0.0
Disposals | 0.0 | 0.0
Depreciation for the period | 0.0 | 0.0
Ending balance | 0.0 | 0.0
Plant & equipment |  |
Mining Interests |  |
Beginning balance | 739.5 |
Ending balance | 692.4 | 739.5
Plant & equipment | New Afton |  |
Mining Interests |  |
Beginning balance | 271.5 |
Ending balance | 275.2 | 271.5
Plant & equipment | Rainy River |  |
Mining Interests |  |
Beginning balance | 466.9 |
Ending balance | 413.8 | 466.9
Plant & equipment | Gross carrying amount |  |
Mining Interests |  |
Beginning balance | 1,530.3 | 1,362.3
Additions | 17.1 | 44.1
Disposals | (9.0) | (7.0)
Transfers | 45.5 | 130.9
Ending balance | 1,583.9 | 1,530.3
Plant & equipment | Accumulated depreciation and amortisation |  |
Mining Interests |  |
Beginning balance | (790.8) | (693.7)
Disposals | 8.1 | 4.2
Depreciation for the period | 108.8 | 101.3
Ending balance | (891.5) | (790.8)
Construction in progress |  |
Mining Interests |  |
Beginning balance | 89.1 |
Ending balance | 112.5 | 89.1
Construction in progress | New Afton |  |
Mining Interests |  |
Beginning balance | 17.2 |
Ending balance | 23.7 | 17.2
Construction in progress | Rainy River |  |
Mining Interests |  |
Beginning balance | 71.9 |
Ending balance | 88.8 | 71.9
Construction in progress | Gross carrying amount |  |
Mining Interests |  |
Beginning balance | 89.1 | 118.1
Additions | 100.2 | 48.4
Disposals | 0.0 | 0.0
Transfers | (76.8) | (77.4)
Ending balance | 112.5 | 89.1
Construction in progress | Accumulated depreciation and amortisation |  |
Mining Interests |  |
Beginning balance | 0.0 | 0.0
Disposals | 0.0 | 0.0
Depreciation for the period | 0.0 | 0.0
Ending balance | $ 0.0 | $ 0.0

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