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Share-based payments - Schedule of Share Based Compensation (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | € 4,417 | € 8,472 | € 19,780
CEO 2025-2027 PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 766 | 0 | 0
CEO 2022-2024 PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 0 | (452) | 4,266
CEO IPO PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 0 | 0 | 840
2025-2027 PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 1,961 | 0 | 0
2024-2026 PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 383 | 557 | 0
2022-2024 PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 0 | 3,332 | 4,062
2025-2028 RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 219 | 0 | 0
2023 RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 283 | 1,458 | 499
2022-2025 RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 1,408 | 1,216 | 1,456
Management IPO PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 0 | 0 | 1,300
Non-Executive Directors’ Remuneration in Shares |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | 813 | 759 | 795
Other share-based payments |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation expense | € (1,416) | € 1,602 | € 6,562

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