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Shareholders' equity - Outstanding (Detail) | Dec. 31, 2020 EquityInstruments | Dec. 31, 2020 USD ($) | Dec. 31, 2020 shares | Dec. 31, 2019 EquityInstruments shares | Dec. 31, 2018 EquityInstruments
--- | --- | --- | --- | --- | ---
Shareholders' equity |  |  |  |  |
Common share outstanding |  |  | 190,956,476 | 189,381,388 |
Stock options | 745,962 | 745,962 |  | 836,427 | 1,015,409
Restricted Share Units | EquityInstruments | 102,708 |  |  | 108,978 |
Total |  |  | 191,805,146 | 190,326,793 |

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