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Earnings per share - Narrative (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Class A shares    
Earnings per share [line items]    
Anti-dilutive share options excluded from calculation of diluted earnings per share (in shares) 5,278,761 8,763,385
Class B Shares    
Earnings per share [line items]    
Anti-dilutive share options excluded from calculation of diluted earnings per share (in shares) 2,099,551