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ACCOUNTING POLICIES (Impairment) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of impairment loss and reversal of impairment loss [line items]        
Discount rate used in current estimate of value in use   12.10%    
Impairment charge (note 4 (f))   $ 42,316 $ 99,000 $ 0
Usiminas Control Group        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Write Down Of Equity Method Investment $ 120,400      
Cash-generating units        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Growth rate used to extrapolate cash flow projections   2.18%    
Discount rate used in current estimate of value in use   12.10% 11.28%  
Argentina | Subsidiaries        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Discount rate used in current estimate of value in use   17.30%    
Brazil | Subsidiaries        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment charge (note 4 (f))     $ 99,000