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Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Trade and other receivables $ 165.2 $ 138.0  
Value contained in precious metal inventory at refineries $ 635.1 $ 739.4  
Interest earned on cash and short-term investments (percent) 3.00% 3.20%  
Impact of 10% change in interest earned on earnings before taxes $ 1.2 $ 1.6  
Impact of 10% increase in metal prices on revenues 281.3 233.6  
Impact of 10% decrease in metal prices on revenues 282.5 235.7  
Impact of 10% increase in metal prices on earnings before taxes 5.3 3.3  
SL-Credit Facility      
Disclosure of detailed information about financial instruments [line items]      
Borrowings outstanding 0.0 $ 0.0 $ 160.0
Notional amount 750.0    
Effective interest rate   5.70%  
Senior note maturing December 2027      
Disclosure of detailed information about financial instruments [line items]      
Borrowings outstanding $ 275.9 $ 273.8 0.0
Interest rate on borrowings 4.625%    
Senior note maturing August 2031      
Disclosure of detailed information about financial instruments [line items]      
Borrowings outstanding $ 419.5 409.8 $ 0.0
Interest rate on borrowings 2.63%    
Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Effect of 10% change in exchange rate on income before taxes $ 70.9 69.0  
Production concentration risk      
Disclosure of detailed information about financial instruments [line items]      
Value contained in precious metal inventory at refineries 68.8 10.8  
Credit risk      
Disclosure of detailed information about financial instruments [line items]      
Current advances to suppliers 6.7 10.4  
Trade receivables from provisional concentrate sales | Customer concentration risk      
Disclosure of detailed information about financial instruments [line items]      
Trade and other receivables $ 31.2 $ 17.5