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Mineral Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]      
Consideration paid (received) $ 54.8    
Construction in progress   $ 175.4 $ 98.7
Cash transferred     $ 19.5