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Related parties - Narrative (Details) - EUR (€)
€ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]        
Termination benefits   € 0 € 1,210 € 0
Board of Directors and Chief Executive Officer | Key management personnel        
Disclosure of transactions between related parties [line items]        
Net defined benefit liability € 0 € 0 € 0 € 149
Advisor to the Chief Executive Officer | Key management personnel        
Disclosure of transactions between related parties [line items]        
Total compensation 100      
Termination benefits € 1,210