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INVENTORIES: (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Metals at average cost:      
Finished goods $ 66.5   $ 78.5
Work-in-process 289.8   330.5
Ore stockpiles on leach pads 260.2   259.7
Supplies at average cost 365.3   345.2
Total current inventory 981.8   1,013.9
Inventory, long-term:      
Ore stockpiles on leach pads 1,066.9   $ 1,064.3
Total leaching costs added as long-term inventory of ore stockpiles in leach pads 75.3 $ 61.5  
Long-term leaching inventories recognized as cost of sales $ 72.3 $ 76.0