v3.26.1
Financial Assets and Financial Liabilities - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Apr. 30, 2025
Disclosure of financial assets [line items]        
Financial assets pledged as collateral for liabilities or contingent liabilities € 113.9      
Investments in equity instruments designated at fair value through other comprehensive income 82.8 € 94.2    
Net gain / (loss) on equity instruments designated at fair value through other comprehensive income (15.9) (146.6) € 3.7  
Investment in DualityBio | Equity investments        
Disclosure of financial assets [line items]        
Investments in equity instruments designated at fair value through other comprehensive income € 13.4 € 0.0   € 4.5