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OTHER LIABILITIES - NON CURRENT AND CURRENT (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [line items] |  |
Net Defined Benefit Liability (Asset) Guaranteed With Property, Plant And Equipment | $ 275.0 |
Bottom of range |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next five years | 178.9 |
Top of range |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next five years | $ 197.3 |
Fair value of plan assets | Usiminas |  |
Disclosure of defined benefit plans [line items] |  |
Number of shares outstanding (shares) | 34,109,762 | 34,109,762

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