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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net deferred tax liabilities $ (461.2) $ (84.4)
Recognized in net earnings in the year (27.7) 86.8
Initial deferred tax liability associated with the Yamana Acquisition 0.0 (881.2)
Disposition of mining properties (Note 9) 11.7 419.3
Recognized in other comprehensive income (loss) in year 0.0 (0.5)
Other 0.0 (1.2)
Net deferred tax liabilities (477.2) (461.2)
Deferred tax assets 44.5 80.4
Deferred tax liabilities (521.7) (541.6)
Net deferred tax liabilities $ (477.2) $ (461.2)