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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 |

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