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Earnings per share - Summary of Weighted Average Shares and Adjusted Weighted Average Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]    
Weighted average number of ordinary shares used in the calculation of basic earnings per share (in shares) 158,856 158,509
Dilutive impact of share options (in shares) 0 0
Dilutive impact of restricted share units (in shares) 526 0
Dilutive impact of performance share units and restricted share units with performance criteria (in shares) 2,157 0
Weighted average number of ordinary shares used in the calculation of diluted earnings per share (in shares) 161,539 158,509