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Financial Instruments and Risk Management (Derivative Instrument Not Designated as Cash Flow Hedged Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
$ / oz
oz
Dec. 31, 2022
USD ($)
Disclosure of detailed information about hedged items [line items]    
Ounces Subject to Contract | oz 69,750  
Unrealized gain on non-hedging derivatives $ (0.9) $ (0.3)
Expense relating to variable lease payments not included in measurement of lease liabilities 104.2 88.2
Derivatives | Gold Options    
Disclosure of detailed information about hedged items [line items]    
Financial liabilities, at fair value (0.8)  
Gold Options | Commodity price risk    
Disclosure of detailed information about hedged items [line items]    
Financial assets, at fair value   0.1
Gains (losses) on change in fair value of derivatives 0.1 3.5
Unrealized gain on non-hedging derivatives $ 0.9 $ 0.3
Purchase Put Options | Gold Options | 2024 | Commodity price risk    
Disclosure of detailed information about hedged items [line items]    
Average realized price per ounce | $ / oz 1,926  
Sold Call Option | Gold Options | 2024 | Commodity price risk    
Disclosure of detailed information about hedged items [line items]    
Average realized price per ounce | $ / oz 2,356