Impairment test (Narrative) (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Dec. 31, 2025 |
Dec. 31, 2023 |
|
| Impairment Test [Abstract] | ||||
| Impairment reversal | $ 2,063.4 | $ 137.0 | $ (2,063.4) | |
| Post tax discount rate | 12.50% | 11.00% | ||
| Long-term nominal growth rate | 2.50% | 2.50% | ||
| Corporate tax rate growth on payment of tax | 9.00% | |||
| Corporate tax rate | 23.00% | |||
| Impairment loss (see Note 7) | 28.5 | $ 28.5 | ||
| Impairment loss | $ 2,063.4 | |||