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Capital structure and financing - C.1. Share capital and other equity reserves (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 18, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 28, 2022
Dec. 31, 2021
Disclosure of reserves within equity [line items]            
Number of shares authorised (in shares)   200,000,000 200,000,000      
Subscribed and fully paid up share capital (in shares)   172,096,305 172,096,305      
Par value per share (usd per share)   $ 1.50 $ 1.50   $ 1.50  
Share capital   $ 258.0 $ 258.0      
Share premium   1,064.0 1,076.0      
Share capital and premium   1,322.0 1,334.0      
Effects of rights offering (in shares) 70,357,088          
Subscribed by exercise of basic subscription rights (in shares) 68,822,675          
Allotment to investors who subscribed over subscription privileges (in shares) 1,534,413          
Effects of rights offering [1]       $ 717.0    
Underwriting commissions and other offering expenses $ 28.0          
Equity   3,574.0 3,445.0 3,634.0   $ 2,740.0
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   (500.0)        
Share based compensation [1]   50.0 52.0 26.0    
Share based cancellation   (35.0)        
Issuance of shares with respect to LTIPs   1.0 1.0 1.0    
Remeasurements of post-employment benefit obligations   1.0 (2.0) (2.0)    
Transfer to legal reserve   0.0 0.0 [1]      
Cash flow hedge reserve movement   (4.0) (10.0) 9.0    
Currency translation movement   15.0 33.0 19.0    
Other equity reserves, ending balance   (531.0) (500.0)      
Legal reserve            
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   18.0 16.0 16.0    
Transfer to legal reserve   7.6 1.9      
Other equity reserves, ending balance   26.0 18.0 16.0    
Equity settled transaction reserve            
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   61.0 51.0 43.0    
Share based compensation   49.0 50.0 25.0    
Share based cancellation   (35.0)        
Issuance of shares with respect to LTIPs   (50.0) (40.0) (17.0)    
Other equity reserves, ending balance   24.0 61.0 51.0    
Hedge reserve            
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   (2.0) 5.0 (3.0)    
Cash flow hedge reserve movement   (2.0) (7.0) 8.0    
Currency translation movement       0.0    
Other equity reserves, ending balance   (4.0) (2.0) 5.0    
Currency translation reserve            
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   (571.0) (626.0) (646.0)    
Currency translation movement   (2.0) 56.0 20.0    
Other equity reserves, ending balance   (573.0) (571.0) (626.0)    
Pension obligation reserve            
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   (6.0) (4.0) (3.0)    
Remeasurements of post-employment benefit obligations   1.0 (2.0) (2.0)    
Cash flow hedge reserve movement       1.0    
Other equity reserves, ending balance   (5.0) (6.0) (4.0)    
Total            
Disclosure of reserves within equity [line items]            
Effects of rights offering $ 717.0     717.0 [1]    
Equity   3,628.0 3,529.0 3,605.0   $ 2,583.0
Other Reserves [Roll Forward]            
Share based compensation [1]   49.0 50.0 25.0    
Share based cancellation   (35.0)        
Issuance of shares with respect to LTIPs   1.0 1.0 $ 1.0    
Transfer to legal reserve [1]   $ 0.0 $ 0.0      
Share capital            
Disclosure of reserves within equity [line items]            
Effects of rights offering (in shares) [1],[2]       70,357,000    
Effects of rights offering [1]       $ 106.0    
Number of shares (in shares) [2]   172,096,000 172,096,000 172,096,305   101,739,217
Equity [1]   $ 258.0 $ 258.0 $ 258.0   $ 153.0
Share premium            
Disclosure of reserves within equity [line items]            
Effects of rights offering [1]       611.0    
Equity [1]   1,064.0 1,076.0 1,085.0   476.0
Other Reserves [Roll Forward]            
Issuance of shares with respect to LTIPs [1]   (12.0) (9.0) (2.0)    
Other reserves            
Disclosure of reserves within equity [line items]            
Equity [1]   (531.0) (500.0) (559.0)   $ (594.0)
Other Reserves [Roll Forward]            
Other equity reserves, beginning balance   (500.0) (559.0) (593.0)    
Share based compensation [1]   49.0 50.0 25.0    
Share based cancellation [1]   (35.0)        
Issuance of shares with respect to LTIPs [1]   (50.0) (40.0) (17.0)    
Remeasurements of post-employment benefit obligations   1.0 (2.0) (2.0)    
Transfer to legal reserve [1]   8.0 2.0      
Cash flow hedge reserve movement   (2.0) (7.0) 9.0    
Currency translation movement   (2.0) 56.0 20.0    
Other equity reserves, ending balance   $ (531.0) $ (500.0) $ (559.0)    
[1] Share capital, share premium (including the effects of rights offering) and other reserves (including share-based compensation) – see note C.1.
[2] The authorized share capital amounts to $300 million divided into 200 million shares with a par value of $1.50 each following the extraordinary general meeting held on February 28, 2022.