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Inventory (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of inventories [Abstract]    
Mining and processing costs, inventories $ 360.4 $ 319.9
Amortization costs, Inventories   152.7
Indirect Production Costs   5.4
Reclassified Amortization Costs   $ 1.1