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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2021
Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract] |
Summary of Weighted Average Shares and Adjusted Weighted Average Shares | The weighted average number of ordinary shares for the purposes of diluted earnings per share reconciles to the weighted average number of ordinary shares used in the calculation of basic earnings per share as follows:
| December 31, 2021 |  | December 31, 2020
Weighted average number of ordinary shares used in the calculation of basic earnings per share | 180,296,588 |  |  | 171,047,400 |
Dilutive impact of share options | 1,008,339 |  |  | 1,369,750 |
Dilutive impact of restricted share units and restricted share units with performance criteria | 246,560 |  |  | 1,732,614 |
Dilutive impact of performance share units | 213,420 |  |  | 1,081,116 |
Weighted average number of ordinary shares used in the calculation of diluted earnings per share | 181,764,907 |  |  | 175,230,880 |

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