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INVESTMENTS - Investments in associates and joint ventures (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments |  |  |  |
Equity | R$ 7,337,378 | R$ 18,087,969 | R$ 12,025,934 | R$ 11,616,610
Company Participation in equity | 96,373 | 140,936 |  |
Company Participation in the income of the year | 36,142 | 31,993 | R$ 7,576 |
Joint ventures |  |  |  |
Investments |  |  |  |
Company Participation in equity | 75,514 | 32,530 |  |
Company Participation in the income of the year | 49,674 | 20,465 |  |
Ibema Companhia Brasileira de Papel |  |  |  |
Investments |  |  |  |
Equity | 140,893 |  |  |
Income of the year | R$ 99,547 |  |  |
Participation equity in joint ventures (as a percent) | 49.90% |  |  |
Company Participation in equity | R$ 70,305 | 28,489 |  |
Company Participation in the income of the year | 49,674 | 20,307 |  |
F&E Technologies LLC |  |  |  |
Investments |  |  |  |
Equity | R$ 10,419 |  |  |
Participation equity in joint ventures (as a percent) | 50.00% |  |  |
Company Participation in equity | R$ 5,209 | 4,041 |  |
Company Participation in the income of the year |  | 158 |  |
Associates |  |  |  |
Investments |  |  |  |
Company Participation in equity | 20,859 | 108,406 |  |
Company Participation in the income of the year | (13,532) | 11,528 |  |
Ensyn Corporation |  |  |  |
Investments |  |  |  |
Equity | 21,629 |  |  |
Income of the year | R$ (30,153) |  |  |
Participation equity in associate (as a percent) | 25.30% |  |  |
Company Participation in equity | R$ 5,472 | 21,437 |  |
Company Participation in the income of the year | (7,629) | 12,860 |  |
Spinnova Oy |  |  |  |
Investments |  |  |  |
Equity | 65,643 |  |  |
Income of the year | R$ (25,183) |  |  |
Participation equity in associate (as a percent) | 23.44% |  |  |
Company Participation in equity | R$ 15,387 | 86,969 |  |
Company Participation in the income of the year | R$ (5,903) | R$ (1,332) |  |

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