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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of number of shares outstanding [abstract]      
Beginning balance   $ 2,923.5  
Shares issued through:      
Shares repurchased and cancelled (in shares) (451,990) 0 0
Exercise of Manitou warrants (in shares)     60,983
Ending balance   $ 3,584.2 $ 2,923.5
Issued capital [member]      
Reconciliation of number of shares outstanding [abstract]      
Number of shares outstanding   396,956,984 393,806,489
Beginning balance   $ 3,738.6 $ 3,703.8
Shares issued through:      
Share-based employment compensation plans (in shares)   1,006,149 1,425,024
Share-based compensation plans   $ 8.6 $ 12.3
Increase (decrease) through acquisition of subsidiary, equity   $ 0.0 13.4
Flow-through share financing (in shares)   451,990  
Flow-through share financing   $ 6.5 $ 0.0
Stock Issued During Period, Share, Acquisition   908,689  
Dividend reinvestment plan and share purchase plan (in shares)   349,088 353,084
Shares issued during period, value, DRIP   $ 5.8 $ 4.1
Shares issued through share purchase plan (in shares)   401,537 469,566
ESPP (iv)   $ 6.3 $ 5.6
Exercise of Manitou warrants (in shares)   88,308  
Exercise of warrants   $ 1.4 0.9
Cancellation of unexchanged shares   $ (2.1) $ (1.5)
Cancellation of unexchanged shares (in shares)   (220,745) (203,755)
Number of shares outstanding   420,365,051 396,956,984
Ending balance   $ 4,138.5 $ 3,738.6
Issued capital [member] | Argonaut Transaction      
Shares issued through:      
Shares repurchased and cancelled (in shares)   20,423,051  
Increase (decrease) through acquisition of subsidiary, equity   $ 360.1  
Issuance of shares related to Argonaut Gold Inc ("Argonaut") acquisition (Note 6)   $ 360.1 $ 0.0
Issued capital [member] | Manitou Gold Inc.      
Shares issued through:      
Shares repurchased and cancelled (in shares)     1,045,593
Manitou acquisition (Note 9)     $ 13.4