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Financial Instruments and Risk Management (Equity Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale $ 22.8 $ 7.8
Metella [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale 10.9  
Monarch Gold [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale 7.1  
Red Pine Exploration [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale 2.0  
Manitou Gold [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale 1.3  
Other Investments [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale $ 1.5