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Other (Loss) Gain (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other gains and losses [Line Items]    
Unrealized gain on non-hedging derivatives $ (0.9) $ (0.3)
Revision to reclamation for closed sites (3.3) 0.0
Reduction of obligation to renounce flow-through exploration expenditures 0.7 2.7
Holding and Arbitration Costs (2.9) (5.0)
Loss on disposal of assets 1.9 0.7
Other (1.5) (2.3)
Other loss (23.8) (5.1)
Silver Stream    
Disclosure of other gains and losses [Line Items]    
Gain (loss) on fair value adjustment 0.0 2.6
Milestone Payments    
Disclosure of other gains and losses [Line Items]    
Unrealized gain on non-hedging derivatives (13.4) (1.1)
Holding Costs $ (0.6) $ (1.0)