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Earnings per share (Tables)
12 Months Ended
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, 2021December 31, 2020
Weighted average number of ordinary shares used in the calculation of basic earnings per share180,296,588 171,047,400 
Dilutive impact of share options1,008,339 1,369,750 
Dilutive impact of restricted share units and restricted share units with performance criteria246,560 1,732,614 
Dilutive impact of performance share units213,420 1,081,116 
Weighted average number of ordinary shares used in the calculation of diluted earnings per share181,764,907 175,230,880