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Supplemental Cash Flow Information (Other Non-cash Items) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of cash flow statement [Line Items]    
Employee contributions $ 4.7 $ 4.7
Distribution of share-based compensation 14.5 15.8
Revision to reclamation for closed sites 0.2 3.3
Interest received 12.6 7.8
Loss on disposal of assets 10.6 1.9
Write down of miscellaneous receivables 4.7 0.0
Reduction of obligation to renounce flow-through exploration expenditures (2.3) (0.7)
Other items (0.1) (2.5)
Other adjustments for non-cash items 11.0 11.8
Milestone Payments    
Disclosure of cash flow statement [Line Items]    
Fair value adjustment on contingent consideration (5.7) (13.4)
Provision for decommissioning, restoration and rehabilitation cost    
Disclosure of cash flow statement [Line Items]    
Reclamation expenses $ 10.6 $ 0.3