Material accounting policies - Estimated useful life of intangible assets (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Software (mostly development costs) | |
| Disclosure of detailed information about intangible assets [line items] | |
| Estimated useful lives (in years) | 5 years |
| Capitalised software development costs | Minimum [Member] | |
| Disclosure of detailed information about intangible assets [line items] | |
| Estimated useful lives (in years) | 5 years |
| Capitalised software development costs | Maximum [Member] | |
| Disclosure of detailed information about intangible assets [line items] | |
| Estimated useful lives (in years) | 8 years |