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Financial Instruments and Risk Management (Available for Sale Financial Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 18.6 $ 23.9
Zacatecas Silver Corp.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 6.7  
Red Pine Exploration Inc.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 5.7  
Orford Mining Corp.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 2.0  
Aztec Minerals Corp.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1.6  
Monarch Mining Corp.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 0.5  
Manitou Gold Inc.    
Disclosure of fair value measurement of assets [line items]    
Financial assets 0.7  
Other investments    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 1.4