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ACQUISITION OF BUSINESS - USINAS SIDERGICAS DE MINAS GERAIS S.A. - USIMINAS (Narrative) (Details) R$ / shares in Units, $ / shares in Units, R$ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2016 USD ($) shares | Jul. 19, 2016 BRL (R$) shares | Apr. 18, 2016 BRL (R$) shares | Oct. 02, 2014 BRL (R$) R$ / shares shares | Sep. 30, 2014 USD ($) | Jan. 16, 2012 shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 R$ / shares | Dec. 31, 2016 R$ / shares | Apr. 20, 2016 USD ($) shares | Apr. 20, 2016 BRL (R$) shares | Dec. 31, 2015 shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current estimate of value in use |  |  |  |  |  |  |  | 11.49% |  |  |  |  |
Number of shares issued |  |  |  |  |  |  | 2,004,743,442 | 2,004,743,442 |  |  |  |  | 2,004,743,442
Fair value of investments in associates for which there are quoted market prices | $ |  |  |  |  |  |  | $ 625.5 | $ 817.6 |  |  |  |  |
Investments in associates | $ |  |  |  |  |  |  | 411.1 | $ 466.3 |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease through write-off, financial assets | $ |  |  |  |  | $ 739.8 |  |  |  |  |  |  |  |
Discount rate used in current estimate of value in use |  |  |  |  | 10.40% |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, investment property | $ |  |  |  |  |  |  | $ 191.9 |  |  |  |  |  |
Preferred stock, shares subscribed |  |  |  |  |  |  |  |  |  |  | 8,500,000 | 8,500,000 |
Preferred stock, value, subscriptions |  |  |  |  |  |  |  |  |  |  | $ 3.1 | R$ 10.9 |
Number of additional shares authorised |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Capital shares, value, subscriptions | R$ |  |  | R$ 1,000.0 |  |  |  |  |  |  |  |  |  |
Proceeds from issuing shares | $ 110.9 | R$ 382.2 |  |  |  |  |  |  |  |  |  |  |
Ternium Investments S.à r.l. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired |  |  |  |  |  | 0 |  |  |  |  |  |  |
Prosid Investments S.A. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired |  |  |  |  |  | 0 |  |  |  |  |  |  |
Confab Industrial S.A. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |
Nippon Steel & Sumitomo Metal Corporation Group | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 46.10% |  |  |  |  |  |  |
T/T Group | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 43.30% |  |  |  |  |  |  |
Previdência Usiminas | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 10.60% |  |  |  |  |  |  |
Caixa de Previdência dos Funcionários | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired |  |  |  | 51,400,000 |  |  |  |  |  |  |  |  |
Siderar S.A.I.C., Ternium Investments S.à r.l. and Prosid Investments S.A. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  | 20.50% |  |  |  |  |
Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  | 35.60% |  |  |  |  |
Level of participation of entity compared with other participating entities |  |  |  |  |  |  |  | 20.50% |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | (per share) |  |  |  |  |  |  | $ 2.53 | $ 3.27 | R$ 10.83 | R$ 8.26 |  |  |
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | 76,400,000 | 76,400,000 |  |  |  |  |  |  |  |  |  |  |
Ordinary shares | T/T Group | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares owned |  |  |  |  |  |  |  | 0.396 |  |  |  |  |
Ordinary shares | Caixa de Previdência dos Funcionários | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, share price | R$ / shares |  |  |  | R$ 12 |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | R$ |  |  |  | R$ 616.7 |  |  |  |  |  |  |  |  |
Ordinary shares | Siderar S.A.I.C., Ternium Investments S.à r.l. and Prosid Investments S.A. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  |  |  | 242,600,000 |  |  |  |  |
Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | (per share) |  |  |  |  |  |  | $ 1.26 | $ 2.75 | R$ 9.10 | R$ 4.10 |  |  |
Preferred shares | T/T Group | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares owned |  |  |  |  |  |  |  | 0.018 |  |  |  |  |
Preferred shares | Siderar S.A.I.C., Ternium Investments S.à r.l. and Prosid Investments S.A. | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  |  |  | 8,500,000 |  |  |  |  |

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