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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of income tax [Abstract]    
Earnings (loss) before taxes and non-controlling interest $ 431.7 $ (58.8)
Statutory Canadian income tax rate (percent) 27.00% 27.00%
Income tax expense (recovery) based on above rates $ 116.6 $ (15.9)
Increase (decrease) due to:    
Non-deductible expenditures 13.8 3.2
Foreign tax rate differences (18.7) 2.7
Change in net deferred tax assets not recognized 34.8 66.3
Effect of other taxes paid (mining and withholding) 45.7 22.1
Effect of foreign exchange on tax expense 71.1 (36.0)
Non-taxable impact of foreign exchange (6.8) 3.8
Change in non-deductible portion of reclamation liabilities 20.5 1.9
Change in income tax expense related to prior years 40.5 0.0
Changes to opening temporary differences 7.7 3.9
Impact of inflation (4.6) (7.4)
Other (1.6) 1.5
Income taxes expense $ 319.0 $ 46.1