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Earnings per share - Narrative (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2022
category
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Earnings per share [abstract]      
Number of categories of dilutive potential shares | category 2    
Employee share options and restricted units (shares) | shares 361 466 261