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Earnings per share (Details) - € / shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings per share        
Weighted number of shares outstanding 223,883,084 187,089,253 217,698,351 187,041,805
Net loss per share basic € (0.30) € (0.31) € (0.57) € (0.39)