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Segment reporting - Items included in measure of adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Nigeria |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Power generation | $ 63.1 | $ 60.4 | $ 180.8 | $ 189.4
Staff costs | 8.6 | 8.0 | 26.4 | 24.5
Tower repairs and maintenance | 6.4 | 4.0 | 16.1 | 14.3
SSA |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Power generation | 26.2 | 22.5 | 73.9 | 68.4
Staff costs | 8.8 | 8.0 | 25.4 | 24.9
Tower repairs and maintenance | 7.1 | 6.5 | 19.7 | 15.0
Latam |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Power generation | 1.7 | 0.8 | 3.7 | 4.1
Staff costs | 4.6 | 5.8 | 14.7 | 19.5
Tower repairs and maintenance | $ 2.7 | 1.8 | $ 7.5 | 6.0
MENA |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Power generation |  | 0.6 |  | 1.9
Staff costs |  | 1.5 |  | 4.3
Tower repairs and maintenance |  | $ 0.7 |  | $ 2.2

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