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Income taxes - Additional Information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Uncertain tax items      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Provisions € 2,800 € 6,600  
Parent Company      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Applicable Italian regional income tax rate 5.57% 5.57% 5.57%
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Applicable Italian regional income tax rate 3.90% 3.90% 3.90%