Property, plant and equipment - Addtional information (Detail) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Unpaid investment decreased | € 0.5 | € 0.8 |
| Property, Plant and Equipment [Member] | ||
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Non cash investments | 0.5 | 0.8 |
| Office Equipment And Installations [Member] | ||
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Additions Property Plant And Equipment | 5.0 | 8.7 |
| Construction [Member] | ||
| Disclosure of detailed information about property, plant and equipment [line items] | ||
| Additions Property Plant And Equipment | € 0.6 | € 0.0 |