v3.25.2
Segment reporting - Summarized segment assets and liabilities and additions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
 [1]
Disclosure of operating segments [line items]          
Segment assets $ 4,489.8   $ 4,489.8   $ 4,246.5
Segment liabilities 4,588.2   4,588.2   $ 4,560.9
Nigeria          
Disclosure of operating segments [line items]          
Segment assets 921.7 $ 858.6 921.7 $ 858.6  
Segment liabilities 319.9 340.0 319.9 340.0  
Additions of property, plant and equipment, right of use assets and intangible assets 17.0 29.3 18.6 50.4  
SSA          
Disclosure of operating segments [line items]          
Segment assets 1,380.5 1,331.0 1,380.5 1,331.0  
Segment liabilities 882.9 892.6 882.9 892.6  
Additions of property, plant and equipment, right of use assets and intangible assets 19.4 31.2 38.1 38.6  
Latam          
Disclosure of operating segments [line items]          
Segment assets 1,901.3 1,912.3 1,901.3 1,912.3  
Segment liabilities 506.4 750.3 506.4 750.3  
Additions of property, plant and equipment, right of use assets and intangible assets $ 47.7 43.1 $ 83.8 87.4  
MENA          
Disclosure of operating segments [line items]          
Segment assets   174.6   174.6  
Segment liabilities   101.7   101.7  
Additions of property, plant and equipment, right of use assets and intangible assets   $ 1.7   $ 2.5  
[1] Revised for corrections to Property, plant and equipment and Trade and other payables (see note 21).