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Financial gain (loss) - Narrative (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Financial Gain (Loss) [Line Items]      
Losses on change in fair value of derivatives € 29,935 € 1,462 € 3,046
Foreign exchange loss 13,444 51 5,573
Gains on change in fair value of derivatives 3,620 1,413 1,006
Foreign exchange gains 11,886 2,774 0
Kreos & Claret BSA      
Disclosure Of Financial Gain (Loss) [Line Items]      
Losses on change in fair value of derivatives 29,935    
Kreos & Claret minimal return indemnifications      
Disclosure Of Financial Gain (Loss) [Line Items]      
Gains on change in fair value of derivatives 3,620    
United States of America, Dollars      
Disclosure Of Financial Gain (Loss) [Line Items]      
Foreign exchange loss 8,639   3,196
Foreign currency translation differences gains (loss)   714 € (1,488)
Foreign exchange gains € 10,663 € 2,035