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INVENTORIES : (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Metals at average cost:      
Finished goods $ 145.1   $ 104.1
Work-in-process 176.2   188.6
Ore stockpiles on leach pads 300.0   243.2
Supplies at average cost 358.1   321.3
Total current inventory 979.4   857.2
Inventory, non-current:      
Ore stockpiles on leach pads 776.4   $ 752.3
Total leaching costs capitalized as non-current inventory of ore stockpiles on leach pads 238.5 $ 232.4  
Leaching inventories recognized in cost of sales $ 157.5 $ 114.0