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Segment reporting - Summarized financial information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($)
Disclosure of operating segments [line items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Revenues from external customers | $ 455.1 | $ 420.3 | $ 1,328.0 | $ 1,273.4
Segment Adjusted EBITDA | 290.8 | 281.8 | 854.3 | 781.5
Elimination of intersegment amounts |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenues from external customers |  |  | 0.0 |
Nigeria |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenues from external customers | 268.0 | 242.3 | 799.7 | 739.6
Segment Adjusted EBITDA | 169.6 | 158.9 | 519.2 | 433.2
SSA |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenues from external customers | 135.9 | 120.1 | 384.5 | 359.7
Segment Adjusted EBITDA | 80.0 | 81.0 | 224.8 | 227.2
Latam |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenues from external customers | 51.2 | 45.1 | 143.8 | 139.4
Segment Adjusted EBITDA | $ 41.2 | 33.8 | $ 110.3 | 100.9
MENA |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenues from external customers |  | 12.8 |  | 34.7
Segment Adjusted EBITDA |  | $ 8.1 |  | $ 20.2

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