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Supplemental Cash Flow Information (Other Non-cash Items) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of cash flow statement [Line Items]    
Unrealized gain on non-hedging derivatives $ (0.3) $ 0.4
Reduction of obligation to renounce flow-through exploration expenditures 2.7 0.0
Employee contributions 2.8 0.0
Adjustments for interest income 1.9 1.3
Adjustments for increase (decrease) in insurance, reinsurance and investment contract liabilities (2.1) (2.0)
Distribution of Share Based Compensation 8.5 5.7
Loss on disposal of assets 0.7 1.5
Other 2.8 3.4
Other adjustments for non-cash items (6.7) (3.1)
Silver Stream    
Disclosure of cash flow statement [Line Items]    
Gain (loss) on fair value adjustment 2.6 0.0
Milestone Payments    
Disclosure of cash flow statement [Line Items]    
Unrealized gain on non-hedging derivatives (1.1) 0.0
Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of cash flow statement [Line Items]    
Reclamation expenses $ 0.4 $ 1.2