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25 Earnings per share (Details) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings per share [abstract] |  |  |
Earnings attributable to Company's owners | R$ 973,318 | R$ 3,367,517 | R$ 2,835,068
Weighted average number of common shares issued | 683,509,869 | 683,509,869 | 683,509,869
Basic and diluted earnings per share (reais per share) | R$ 1.42 | R$ 4.93 | R$ 4.15

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