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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, 2024
USD ($)
$ / oz
Dec. 31, 2023
USD ($)
Disclosure of detailed information about hedged items [line items]    
Average realized price per ounce | $ / oz 1,950  
Unrealized loss on commodity derivatives $ 24.2 $ 0.9
Expense relating to variable lease payments not included in measurement of lease liabilities 131.9 104.2
Derivatives | Gold Options    
Disclosure of detailed information about hedged items [line items]    
Financial assets, at fair value (0.8)  
Gold Options | Derivatives    
Disclosure of detailed information about hedged items [line items]    
Financial liabilities, at fair value 0.0  
Gold Options | Commodity price risk    
Disclosure of detailed information about hedged items [line items]    
Unrealized loss on commodity derivatives (9.3) (0.1)
Fair value adjustment on contingent consideration $ 24.2 $ 0.9