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Related parties - Narrative (Details) - Key management personnel - EUR (€) € in Thousands | 8 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2025 | Dec. 31, 2024
Board of Directors and Chief Executive Officer |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Net defined benefit liability | € 0 | € 0 | € 0
Advisor to the Chief Executive Officer |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Total compensation | 100 |  |
Termination benefits | € 1,210 |  |

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