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Note 25 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Details Textual) R$ / shares in Units, t in Thousands, € in Millions, R$ in Millions, $ in Millions |  |  | 12 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 09, 2018 USD ($) | Sep. 01, 2013 R$ / shares shares | Dec. 31, 2019 USD ($) t | Dec. 31, 2019 USD ($) t | Dec. 31, 2019 EUR (€) t | Dec. 31, 2019 BRL (R$) t | Oct. 10, 2018 USD ($) | Oct. 10, 2018 BRL (R$)
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Performance Guarantees Issued |  |  | $ 2,500.0 | $ 2,500.0 |  |  |  |
Techgen s.a. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 22.00% |  |  |  |  |
Term of supply contract (Year) |  |  |  | 25 years |  |  |  |
Proportion of corporate guarantee covering obligations |  |  | 22.00% | 22.00% | 22.00% | 22.00% |  |
Confab [member] | Chubb [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Payments for settlement | $ 3.5 |  |  |  |  |  |  |
Settlement, amount ordered to pay |  |  |  |  |  |  | $ 21.6 | R$ 89.8
Confab [member] | Veracel Celulose S.A. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Settlement, amount ordered to pay, insurance deductible |  |  | $ 15.6 | $ 15.6 |  | R$ 62.9 |  |
Settlement, amount ordered to pay, damages |  |  | 13.4 | 13.4 |  | 54.0 |  |
Tribunal de Contas da Uniao [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | $ 7.4 | 7.4 |  | R$ 29.8 |  |
Transportadora de Gas del Norte S.A. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Term of supply contract (Year) |  |  | 9 years |  |  |  |  |
Purchase commitments |  |  | $ 27.4 | 27.4 |  |  |  |
Praxair S.A. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Term of supply contract (Year) |  |  | 14 years |  |  |  |  |
Purchase commitments |  |  | $ 53.7 | 53.7 |  |  |  |
Graftech [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Purchase commitments |  |  | 26.8 | 26.8 |  |  |  |
Vale International S.A. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Purchase commitments |  |  | $ 33.6 | $ 33.6 |  |  |  |
Percent of annual iron ore needs supplied |  |  | 70.00% | 70.00% | 70.00% | 70.00% |  |
Maximum number of tons of pellets supplied annually (Metric Ton) | t |  |  | 770 | 770 | 770 | 770 |  |
Canadian National Railway [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Purchase commitments |  |  | $ 18.9 | $ 18.9 |  |  |  |
Air Liquide Mexico S. de R.L. de C.V. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Purchase commitments |  |  | 21.2 | 21.2 |  |  |  |
Nucor Steel Memphis Inc. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Purchase commitments |  |  | 107.1 | 107.1 |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Tax contingent liability [member] | BRAZIL |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | $ 14.1 | $ 14.1 |  | R$ 56.8 |  |
Fine imposed, percentage of allegedly undue credits |  |  | 75.00% | 75.00% | 75.00% | 75.00% |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, percentage |  | 80.00% |  |  |  |  |  |
Tag-along tender offer to non-controlling interests (in BRL per share) | R$ / shares |  | R$ 28.80 |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, shares (in shares) | shares |  | 182,609,851 |  |  |  |  |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] | Legal proceedings contingent liability [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Tag-along tender offer to non-controlling interests, contingent liability |  | 17.90% |  |  |  |  |  |
Ternium S.A. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 11.46% |  |  |  |  |
Ternium S.A. [member] | Techgen s.a. [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 48.00% |  |  |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014 [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | $ 28.0 | $ 28.0 | € 25.0 |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014, principal [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | 23.2 | 23.2 | 20.7 |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014, interest and penalties [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | 4.8 | 4.8 | 4.3 |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015 [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | 11.6 | 11.6 | 10.3 |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015, principal [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | 9.1 | 9.1 | 8.1 |  |  |
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015, interest and penalties [member] | ITALY |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  | $ 2.5 | $ 2.5 | € 2.2 |  |  |

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