v3.24.0.1
Share capital - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 20, 2023
shares
Jan. 03, 2023
shares
Feb. 03, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
$ / shares
shares
Dec. 31, 2023
Vote / shares
shares
Dec. 31, 2021
USD ($)
Common Share capital            
Common shares issued (in shares)     21.0      
Share issue price (in dollars per share) | $ / shares     $ 25.00      
Share issue related cost | $           $ 25
Subordinate voting shares            
Common Share capital            
Number of votes per common share | Vote / shares         1  
Common shares issued (in shares)       17.0    
Share issue price (in dollars per share) | $ / shares       $ 34.00    
Subordinate voting shares | WillowTree            
Common Share capital            
Common shares issued (in shares)   6.0        
Multiple voting shares            
Common Share capital            
Number of votes per common share | Vote / shares         10  
Share split ratio     4.5   4.5  
Multiple voting shares | Baring Private Equity Asia            
Common Share capital            
Common shares issued (in shares)     82.0      
Shares issued (in shares)     22.0      
Common shares converted (in shares) 33.0          
Proportion of voting rights held by non-controlling interests 10.50%          
Initial Public Offering            
Common Share capital            
Common shares issued (in shares)     21.0      
Share issue price (in dollars per share) | $ / shares     $ 25.00      
Gross proceeds from issuing shares | $     $ 525      
Proceeds from issuing shares | $     500      
Share issue related cost | $     34      
Deferred tax expense (income) | $     $ 9      
Initial Public Offering | Baring Private Equity Asia            
Common Share capital            
Common shares sold (in shares)     22.0      
Multiple voting shares to subordinate voting shares            
Common Share capital            
Number of shares converted to subordinate voting shares (in shares)       14.0    
Unissued Subordinate Voting Shares Reserved for Issuance Under our Share-based Compensation Plans            
Common Share capital            
Number of shares authorised (in shares)         17.0  
Unissued Subordinate Voting Shares Reserved for Issuance Under Employee Share Purchase plan            
Common Share capital            
Number of shares authorised (in shares)         5.0