Employee benefit obligations - Additional Information (Detail) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of defined benefit plans [line items] | ||
| Expected contributions defined benefit retirement plan | € 4.6 | |
| Expected contributions postretirement medical benefits | 1.8 | |
| Past Year Employee Benefit Obligations | 14.0 | |
| Accrued premiums post retirement health benefits | 7.0 | € 7.0 |
| Defined contribution plans liability | 7.0 | 8.0 |
| Defined contribution plans liability included in trade and other payables | € 2.0 | € 2.0 |