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Earnings per share (EPS) - income data used in the basic and diluted EPS calculations for loss from discontinued operations attributable to owners (Details) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings per share      
Loss for the year from discontinued operations € (751)    
Class A shares      
Earnings per share      
Loss for the year from discontinued operations € (524)    
Basic EPS from discontinued operations € 0.00    
Diluted EPS from discontinued operations € 0.00    
Class B shares      
Earnings per share      
Loss for the year from discontinued operations € (227)    
Basic EPS from discontinued operations € 0.00    
Diluted EPS from discontinued operations € 0.00 € 0.00 € 0.00