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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 |

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