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DESCRIPTION OF THE BUSINESS: (Details)
$ in Millions
 12 Months Ended
Apr. 15, 2020
USD ($)
Dec. 31, 2020
$ / lb
$ / item
Percentage of ownership interest held by the parent company   88.90%
Percentage of operating over production capacity during COVID-19 time   0.98%
Copper price assumption | $ / lb   2.00
Molybdenum price assumption | $ / item   4.00
Minimum    
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins   1.3
Maximum    
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins   4.3
Fixed-rate senior unsecured notes issued April 2010    
Repayment of debt | $ $ 400