v3.26.1
Revenue and expenses (Schedule of finance income and expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Net interest expense on long-term debt    
Net interest expense on long-term debt $ 60.7 $ 69.8
Accretion on streaming arrangements    
Additions 20.5 24.0
Variable consideration adjustments - prior periods (0.6) 0.2
Accretion on streaming arrangements 19.9 24.2
Change in fair value of financial instruments    
Gold prepayment liability 0.0 10.7
Unrealized loss on non-quotational pricing hedges 0.0 0.2
Realized loss on non-quotational pricing hedges 2.3 8.9
Investments at fair value through profit or loss (55.2) (3.2)
Change in fair value of financial instruments (52.9) 16.6
Other net finance (income) expense    
Net foreign exchange (gain) loss (18.6) 21.0
Accretion on community agreements measured at amortized cost 6.4 4.7
Accretion on environmental provisions 11.1 10.5
Accretion on Wheaton refund liability 0.6 0.6
Accretion on deferred and contingent liability 1.4 0.0
Withholding taxes 0.0 2.2
Loss on disposal of investments 0.0 0.1
Interest on equipment financing and leases 9.0 6.7
Interest income (22.3) (15.7)
Other finance expense 4.1 8.0
Other net finance (income) expenses (8.3) 38.1
Net finance expense $ 19.4 $ 148.7