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Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Nov. 24, 2023
Mar. 31, 2023
Mar. 30, 2023
Mar. 29, 2023
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]              
Trade and other receivables $ 138.0 $ 136.6          
Value contained in precious metal inventory at refineries $ 739.4 $ 497.9          
Interest earned on cash and short-term investments (percent) 3.20% 1.40%          
Impact of 10% change in interest earned on earnings before taxes $ 1.6 $ 0.3          
Lease obligations 97.9 33.1          
Impact of 10% increase in metal prices on revenues 233.6 149.9          
Impact of 10% decrease in metal prices on revenues 235.7 151.6          
Impact of 10% increase in metal prices on earnings before taxes 3.3 4.9          
SL-Credit Facility              
Disclosure of detailed information about financial instruments [line items]              
Borrowings outstanding 0.0 160.0         $ 0.0
Notional amount $ 750.0   $ 750.0   $ 750.0 $ 500.0  
Effective interest rate 5700.00%            
Senior note maturing December 2027              
Disclosure of detailed information about financial instruments [line items]              
Borrowings outstanding $ 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 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 $ 69.0 $ 10.7          
Interest rate risk              
Disclosure of detailed information about financial instruments [line items]              
Weighted average rate on lease liabilities 8.90% 9.70%          
Production concentration risk              
Disclosure of detailed information about financial instruments [line items]              
Value contained in precious metal inventory at refineries $ 10.8 $ 37.0          
Credit risk              
Disclosure of detailed information about financial instruments [line items]              
Current advances to suppliers 10.4 8.9          
Trade receivables from provisional concentrates sales | Customer concentration risk              
Disclosure of detailed information about financial instruments [line items]              
Trade and other receivables $ 17.5 $ 28.7