Segment reporting - Items included in measure of adjusted EBITDA (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Nigeria | ||||
| Disclosure of operating segments [line items] | ||||
| Power generation | $ 56.0 | $ 71.2 | $ 117.7 | $ 129.0 |
| Staff costs | 9.7 | 6.7 | 17.7 | 16.6 |
| Tower repairs and maintenance | 4.8 | 4.9 | 9.8 | 10.2 |
| SSA | ||||
| Disclosure of operating segments [line items] | ||||
| Power generation | 25.0 | 16.7 | 47.7 | 45.9 |
| Staff costs | 8.2 | 8.6 | 16.6 | 16.9 |
| Tower repairs and maintenance | 6.9 | 0.7 | 12.6 | 8.5 |
| Latam | ||||
| Disclosure of operating segments [line items] | ||||
| Power generation | 0.8 | 2.1 | 2.0 | 3.3 |
| Staff costs | 5.7 | 6.5 | 10.1 | 13.7 |
| Tower repairs and maintenance | $ 2.4 | 2.5 | $ 4.7 | 4.3 |
| MENA | ||||
| Disclosure of operating segments [line items] | ||||
| Power generation | 0.6 | 1.2 | ||
| Staff costs | 1.5 | 2.9 | ||
| Tower repairs and maintenance | $ 0.8 | $ 1.5 | ||