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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
INVENTORIES    
Stockpile ore $ 23.7 $ 21.6
Work-in-process 10.0 9.3
Finished goods 14.3 7.0
Supplies 53.0 55.4
Total current inventories $ 101.0 $ 93.3