v3.26.1
Stated capital (Details) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of classes of share capital [line items]    
Beginning Balance, Number of shares 335,521  
Shares issued on exercise of options (in shares) 1,150  
Ending Balance, Number of shares 336,671  
Beginning balance, Equity $ (89.8) $ (314.4)
Ending balance, Equity (23.7) (203.0) [1]
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 5.1 15.3
Ending balance, Equity 5,424.8 $ 5,418.4 [1]
Share capital    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 101.7  
Shares issued on exercise of options 0.3  
Ending balance, Equity 102.0  
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 0.3  
Ending balance, Equity 101.0  
Share premium    
Disclosure of classes of share capital [line items]    
Beginning balance, Equity 5,348.9  
Shares issued on exercise of options 4.8  
Ending balance, Equity 5,353.7  
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 4.8  
Ending balance, Equity $ 5,323.8  
[1] The closing balance of accumulated losses at 31 March 2025 reflects a depreciation adjustment, together with the associated deferred tax impact, which was previously incorporated into the opening balance at 31 December 2024, as disclosed in Note 34 to the 2025 Annual Report on Form 20-F.