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Segment reporting - Summarized segment assets and liabilities and additions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | [1]
Disclosure of operating segments [line items] |  |  |  |  |
Segment assets | $ 4,683.3 |  | $ 4,683.3 |  | $ 4,246.5
Segment liabilities | 4,645.2 |  | 4,645.2 |  | $ 4,560.9
Nigeria |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Segment assets | 883.5 | $ 864.3 | 883.5 | $ 864.3 |
Segment liabilities | 316.6 | 337.8 | 316.6 | 337.8 |
Additions of property, plant and equipment, right of use assets and intangible assets | 41.7 | 19.4 | 60.3 | 69.8 |
SSA |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Segment assets | 1,356.1 | 1,373.7 | 1,356.1 | 1,373.7 |
Segment liabilities | 885.2 | 908.4 | 885.2 | 908.4 |
Additions of property, plant and equipment, right of use assets and intangible assets | 31.3 | 34.2 | 69.4 | 72.8 |
Latam |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Segment assets | 1,936.1 | 1,950.6 | 1,936.1 | 1,950.6 |
Segment liabilities | 525.0 | 774.1 | 525.0 | 774.1 |
Additions of property, plant and equipment, right of use assets and intangible assets | $ 23.0 | 42.8 | $ 106.8 | 130.2 |
MENA |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Segment assets |  | 176.1 |  | 176.1 |
Segment liabilities |  | 101.1 |  | 101.1 |
Additions of property, plant and equipment, right of use assets and intangible assets |  | $ 2.4 |  | $ 4.9 |
[1] | September 30,

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