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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

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