v3.26.1
Financial Assets and Financial Liabilities - Summary of Equity Investments Designated at Fair Value Through OCI (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Apr. 30, 2025
Dec. 31, 2024
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Total € 82.8   € 94.2
Equity investments | Investment in Autolus      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Total 56.5   75.4
Equity investments | Investment in Ryvu      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Total 12.3   17.3
Equity investments | Investment in DualityBio      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Total 13.4 € 4.5 0.0
Other Investments      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Total € 0.6   € 1.5