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INVENTORIES: (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Metals at average cost:      
Finished goods $ 78.5 $ 58.6  
Work-in-process 330.5 340.7  
Ore stockpiles on leach pads 259.7 259.7  
Supplies at average cost 345.2 313.9  
Total current inventory 1,013.9 972.9  
Inventory, long-term:      
Ore stockpiles on leach pads 1,064.3 1,097.6  
Total leaching costs added as long-term inventory of ore stockpiles in leach pads 264.3 247.4 $ 194.0
Long-term leaching inventories recognized as cost of sales $ 297.5 $ 313.7 $ 359.1