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Subsequent events - Narrative (Details)
12 Months Ended
Jan. 24, 2024
€ / shares
Dec. 31, 2023
€ / shares
Feb. 14, 2024
dividend
€ / shares
Dec. 31, 2022
€ / shares
Subsequent Event [Line Items]        
Dividends declared (in EUR per share)   € 6.10    
Dividends payable (in EUR per share)   € 1.75   € 5.80
Subsequent Event        
Subsequent Event [Line Items]        
Dividends declared (in EUR per share) € 6.10      
Dividends payable (in EUR per share)     € 1.45  
Number of interim dividends | dividend     2  
Subsequent Event | Interim dividend        
Subsequent Event [Line Items]        
Dividends payable (in EUR per share)     € 1.45  
Subsequent Event | Final dividend        
Subsequent Event [Line Items]        
Dividends payable (in EUR per share)     € 1.75