Property, plant and equipment - Disclosure of non-current operating assets by region (Details) - EUR (€) € in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | € 160,380 | € 183,373 |
| United Kingdom | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | 75,914 | 93,309 |
| Austria | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | 44,983 | 48,533 |
| Nordics | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | 35,741 | 36,264 |
| France | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | 3,106 | 4,350 |
| United States | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | 506 | 781 |
| Canada | ||
| Disclosure Of Non-Current Operating Assets By Region [Line Items] | ||
| NON-CURRENT ASSETS | € 130 | € 138 |