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Earnings per share (Tables)
12 Months Ended
Dec. 31, 2020
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:
December 31, 2020December 31, 2019
Weighted average number of ordinary shares used in the calculation of basic earnings per share171,047,400 158,855,924 
Dilutive impact of share options1,369,750 — 
Dilutive impact of restricted share units433,838 526,058 
Dilutive impact of performance share units and restricted share units with performance criteria 2,379,892 2,156,654 
Weighted average number of ordinary shares used in the calculation of diluted earnings per share175,230,880 161,538,636