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Share-based payment arrangements - Reconciliation of outstanding share options (Details)
 12 Months Ended
Dec. 31, 2024
shares
Dec. 31, 2023
shares
€ / shares
Dec. 31, 2022
shares
€ / shares
Dec. 31, 2021
shares
€ / shares
Number of options        
Number of options outstanding, January 1 (in shares) | shares 0 0 236,590 236,590
Number of options forfeited (in shares) | shares     0 0
Number of options exercised (in shares) | shares     (236,590) 0
Number of options granted (in shares) | shares     0 0
Number of options outstanding, December 31 (in shares) | shares 0 0 0 236,590
Number of options vested (in shares) | shares     0 236,590
Weighted average exercise price        
Beginning (in eur per share) | € / shares   € 0 € 7.732 € 7.732
Forfeited during the year (in eur per share) | € / shares     0 0
Exercised during the year (in eur per share) | € / shares     6.843 0
Granted during the year (in eur per share) | € / shares     0 0
Ending (in eur per share) | € / shares     0 7.732
Vested (in eur per share) | € / shares     € 0 € 0