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v3.21.1

Stockholders' equity - Shareholders' Agreement (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 14, 2017 | Dec. 31, 2020
Shareholders Agreement |  |
Percentage of shareholders that will be bind by a new shareholders' agreement post merger |  | 15.00%
Valepar Agreement |  |
Shareholders Agreement |  |
Percentage of shareholders that will be bind by a new shareholders' agreement post merger | 20.00% |

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- References No definition available. + Details
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- Definition The percentage of shares acceptance of the proposal and the merger on a converted basis. + References No definition available. + Details
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- Details
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