Income tax benefits / (expenses) - Summary of tax losses carried forward (Details) - EUR (€) € in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Tax losses carried forward | ||
| Unused tax losses for which no deferred tax asset recognised | € 1,294,500 | € 1,204,225 |
| Expiry within 5 years | ||
| Tax losses carried forward | ||
| Unused tax losses for which no deferred tax asset recognised | 73,705 | 59,018 |
| Expiry over 5 years | ||
| Tax losses carried forward | ||
| Unused tax losses for which no deferred tax asset recognised | 162,540 | 168,994 |
| No expiration | ||
| Tax losses carried forward | ||
| Unused tax losses for which no deferred tax asset recognised | € 1,058,255 | € 976,213 |