Supplementary cash flow information (Schedule of other cash generated from / (used in) operating activities) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Revenue and Expenses [Line Items] | ||
| Other cash generated from / (used in) operating activities | $ (27.7) | $ (3.8) |
| Share based compensation paid [Member] | ||
| Revenue and Expenses [Line Items] | ||
| Other cash generated from / (used in) operating activities | (14.2) | (4.5) |
| Consideration received from sale of non-core project [Member] | ||
| Revenue and Expenses [Line Items] | ||
| Other cash generated from / (used in) operating activities | (14.9) | 0.0 |
| Other [Member] | ||
| Revenue and Expenses [Line Items] | ||
| Other cash generated from / (used in) operating activities | $ 1.4 | $ 0.7 |