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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
INVENTORIES    
Stockpile ore $ 21.6 $ 32.6
Work-in-process 9.3 8.3
Finished goods 7.0 12.5
Supplies 55.4 56.6
Total current inventories $ 93.3 $ 110.0