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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2019
Weighted average ordinary shares and adjusted weighted average ordinary shares [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:
| 2019 |  |  | 2018 |
Weighted average number of ordinary shares used in the calculation of basic earnings per share | 158,856 |  |  | 158,509 |
Dilutive impact of share options | — |  |  | — |
Dilutive impact of restricted share units | 526 |  |  | — |
Dilutive impact of performance share units and restricted share units with performance criteria | 2,157 |  |  | — |
Weighted average number of ordinary shares used in the calculation of diluted earnings per share | 161,539 |  |  | 158,509 |

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