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Other Intangible Assets and Goodwill - Summary of Goodwill Recognized (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]    
Goodwill € 362.5 € 61.2
Intangible assets with indefinite useful life 444.5 0.0
Total 807.0 61.2
CGU Immunotherapies    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 352.2 60.7
Intangible assets with indefinite useful life 444.5 0.0
Total 796.7 60.7
External Product Sales of JPT    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 0.5 0.5
Intangible assets with indefinite useful life 0.0 0.0
Total 0.5 0.5
External Business of InstaDeep    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 9.8 0.0
Intangible assets with indefinite useful life 0.0 0.0
Total € 9.8 € 0.0