v3.26.3
Segment reporting - Summarized financial information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Geographical information        
Revenues from external customers $ 490.5 $ 403.9 $ 1,334.5 $ 1,184.2
Discontinued operations        
Geographical information        
Revenues from external customers 17.6 51.2 111.8 143.8
Aggregate continuing and discontinuing operations        
Geographical information        
Segment Adjusted EBITDA 305.8 290.8 873.7 854.3
Nigeria        
Geographical information        
Revenues from external customers 359.4 268.0 942.6 799.7
Nigeria | Aggregate continuing and discontinuing operations        
Geographical information        
Revenues from external customers 359.4 268.0 942.6 799.7
Segment Adjusted EBITDA 215.0 169.6 564.0 519.2
SSA        
Geographical information        
Revenues from external customers 131.1 135.9 391.9 384.5
SSA | Aggregate continuing and discontinuing operations        
Geographical information        
Revenues from external customers 131.1 135.9 391.9 384.5
Segment Adjusted EBITDA 74.8 80.0 223.3 224.8
Latam | Discontinued operations        
Geographical information        
Revenues from external customers 17.6 51.2 111.8 143.8
Latam | Aggregate continuing and discontinuing operations        
Geographical information        
Revenues from external customers 17.6 51.2 111.8 143.8
Segment Adjusted EBITDA $ 16.0 $ 41.2 $ 86.4 $ 110.3