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Supplemental cash flow information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
CHANGE IN NON-CASH OPERATING WORKING CAPITAL    
Trade and other receivables $ (8.8) $ (4.1)
Inventories 2.8 (6.5)
Prepaid expenses and other (8.3) (1.8)
Trade and other payables (1.7) 6.6
Total change in non-cash operating working capital (16.0) (5.8)
OTHER NON-CASH ADJUSTMENTS    
Loss (gain) on revaluation of foreign exchange forward contracts and fuel hedge swap contracts 7.4 (1.4)
Unrealized (gain) loss on provisionally priced concentrate contracts (1.2) 0.3
Equity settled share-based payment expense 0.6 0.8
Gain on extinguishment of New Afton free cash flow interest obligation (Note 10) (42.3) 0.0
Loss on disposal of assets 0.9 0.3
Unrealized loss on revaluation of non-current derivative financial instruments 130.6 108.1
Loss on revaluation of CSP’s reclamation and closure cost obligation 0.0 0.5
Inventory net realizable value (write-up) write-down (Note 7) (16.4) 0.7
Loss on revaluation of investments 0.9 4.4
Total other non-cash adjustments $ 80.6 $ 113.7