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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,