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INVENTORIES (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]    
Finished goods $ 95.2 $ 74.4
Ore stockpiles 33.6 80.1
Mine supplies 173.3 172.8
Current inventories 302.1 327.3
Non-current ore stockpiles 124.1 198.3
Inventories $ 426.2 $ 525.6