Basis of preparation and statement of compliance - Foreign Exchange Rates (Details) - $ / € |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Foreign exchange rates [abstract] | |||
| Average exchange rate for the period | 1.0927 | 1.0813 | 1.0824 |
| Exchange rate at the end of period | 1.172 | 1.0705 | 1.0389 |