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Derivative Financial Instruments - Foreign currency risk hedging - Movements in the hedging reserve (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative Financial Instruments    
Cumulative fair value change at the beginning € 1,343  
Cumulative fair value change at the end (21,559) € 1,343
Foreign currency risk and Foreign currency risk - Time value    
Derivative Financial Instruments    
Cumulative fair value change at the beginning (1,820)  
Time value adjustment for the year (3,621)  
Cumulative fair value change at the end (9,769) (1,820)
Foreign currency risk and Foreign currency risk - Time value | FX forward contracts    
Derivative Financial Instruments    
Fair value adjustment for the year (3,518) € (1,820)
Foreign currency risk and Foreign currency risk - Time value | Option collars    
Derivative Financial Instruments    
Fair value adjustment for the year € (810)