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Income Taxes - Reconciliation of effective income tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of income tax [Abstract]    
Earnings (loss) before taxes and non-controlling interest $ (58.8) $ (301.0)
Statutory Canadian income tax rate (percent) 27.00% 27.00%
Income tax expense (recovery) based on above rates $ (15.9) $ (81.3)
Increase (decrease) due to:    
Non-deductible expenditures 3.2 7.4
Foreign tax rate differences 2.7 (11.7)
Change in net deferred tax assets not recognized 66.3 22.3
Derecognition of deferred tax assets previously recognized 0.0 50.4
Effect of other taxes paid (mining and withholding) 22.1 15.7
Effect of foreign exchange on tax expense (36.0) (21.5)
Non-taxable impact of foreign exchange 3.8 6.3
Change in non-deductible portion of reclamation liabilities 1.9 12.2
Unrecognized tax benefit on termination fee related to the Yamana acquisition 0.0 39.8
Other (2.0) (0.5)
Income taxes expense 46.1 39.1
Deferred taxes recovery $ 0.5 0.5
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Effective tax increase   39.8
Yamana To Gold Fields    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Termination fee   $ 300.0