Segment reporting - Items included in measure of adjusted EBITDA (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of operating segments [line items] | ||
| Power generation | $ 85.6 | $ 84.4 |
| Staff costs | 39.4 | 40.7 |
| Tower repairs and maintenance | 13.2 | 10.7 |
| Unallocated items | ||
| Disclosure of operating segments [line items] | ||
| Staff costs | 19.9 | 24.3 |
| Nigeria | Operating segments | ||
| Disclosure of operating segments [line items] | ||
| Power generation | 61.7 | 61.7 |
| Staff costs | 12.3 | 8.0 |
| Tower repairs and maintenance | 6.6 | 5.0 |
| SSA | Operating segments | ||
| Disclosure of operating segments [line items] | ||
| Power generation | 23.9 | 22.7 |
| Staff costs | 7.2 | 8.4 |
| Tower repairs and maintenance | 6.6 | 5.7 |
| Latam | Operating segments | Discontinued operations | ||
| Disclosure of operating segments [line items] | ||
| Power generation | 1.2 | 1.2 |
| Staff costs | 6.3 | 4.4 |
| Tower repairs and maintenance | $ 2.1 | $ 2.3 |