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Impairment of intangible assets and property, plant and equipment - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment of goodwill recognized € 0 € 0 € 0
Bottom of range      
Disclosure of impairment loss and reversal of impairment loss [line items]      
After tax discount rates 7.25%    
Top of range      
Disclosure of impairment loss and reversal of impairment loss [line items]      
After tax discount rates 8.25%    
Opella (discontinued operation, see Note D.1.) | Cash-generating units      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Rate used for Impairment of goodwill 7.25%    
Biopharma (operating segment) | Goodwill      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Perpetual growth rates applied to future cash flows 0.00%    
Biopharma (operating segment) | Cash-generating units      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Pre-tax discount rates 9.80%