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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholder claims, Mexican income tax adjustment & Argentine tax claim) (Details) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2017 | Apr. 14, 2015 | Mar. 31, 2017 | Jun. 28, 2016
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Comissão de Valores Mobiliários | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Number of shares exceeding threshold for tender offer requirement |  | 5.2 |  |
Domestic Tax Authority | Mexican Tax Authority |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Tax contingent liability | $ 58.4 |  |  |
Tax contingent liability | Domestic Tax Authority | Mexican Tax Authority |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Liability from settlement with taxing authority |  |  |  | $ 15.9
Tax contingent liability | Domestic Tax Authority | Argentina Tax Authority |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Liability from settlement with taxing authority including interest |  |  | $ 12.8 |

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