v3.26.1
Stated capital (Details) - USD ($)
shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of classes of share capital [line items]    
Beginning Balance, Number of shares 335,521  
Shares issued on exercise of options (in shares) 2,820  
Ending Balance, Number of shares 338,341  
Beginning balance, Equity $ (89.8) $ (314.4)
Ending balance, Equity (182.6) (98.4)
Stated capital net of issue costs    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 5,419.7 5,403.1
Shares issued on exercise of options 20.6 16.6
Ending balance, Equity 5,440.3 $ 5,419.7
Share capital    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 101.7  
Shares issued on exercise of options 0.8  
Ending balance, Equity 102.5  
Share capital net of issue costs    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 100.7  
Shares issued on exercise of options 0.8  
Ending balance, Equity 101.5  
Share premium    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 5,348.9  
Shares issued on exercise of options 19.8  
Ending balance, Equity 5,368.7  
Share premium net of issue costs    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 5,319.0  
Shares issued on exercise of options 19.8  
Ending balance, Equity $ 5,338.8