Audit and assurance services fees - Schedule of Billed and Accrued from its Independent Auditors (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Audit and assurance services fees [Abstract] | |||
| Audit services | € 8.2 | € 11.3 | € 2.4 |
| All other assurance services | 0.2 | 0.3 | 0.1 |
| Total audit and assurance services fees | € 8.4 | € 11.6 | € 2.5 |