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Related parties - Summary of key management personnel compensation (Supervisory Board) (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of key management personnel compensation [Line Items]    
Total compensation € 15,782 € 18,008
Supervisory Board members    
Disclosure of key management personnel compensation [Line Items]    
Total compensation € 1,152 € 1,048