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Cash and cash equivalents - Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Cash And Cash Equivalents [Line Items] |  |  |
Notice accounts | € 5,744 | € 44,239 | € 231,562
Effect of movements in exchange rates on cash held | (10,251) | 2,382 | (5,072)
United States of America, Dollars |  |  |
Disclosure Of Cash And Cash Equivalents [Line Items] |  |  |
Effect of movements in exchange rates on cash held | € (8,639) | € 2,035 | € (3,196)

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- Definition The effect of exchange rate changes on cash and cash equivalents held or due in a foreign currency. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 28 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_28&doctype=Standard -URIDate 2025-03-27 + Details
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