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Share-based compensation - Schedule of Share Options and Other Equity Instruments (Details)
 12 Months Ended
Dec. 31, 2024
shares
year
share
yr
$ / shares
Dec. 31, 2024
shares
year
share
yr
$ / shares
SFr / shares
Dec. 31, 2023
year
shares
share
$ / shares
Dec. 31, 2023
year
shares
share
SFr / shares
$ / shares
Dec. 31, 2022
$ / shares
Class A          
Share Options [Abstract]          
Share options outstanding at beginning of period (in shares) 9,102,323 9,102,323 11,248,314 11,248,314  
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 4.13 $ 4.13 $ 3.46 $ 3.46 $ 3.83
Share options granted (in shares) | share 0 0 0 0  
Share options forfeited (in shares) (3,940) (3,940) (7,500) (7,500)  
Weighted average exercise price of share options forfeited in share-based payment arrangement (USD per share) | SFr / shares   $ 11.69   $ 0.11  
Share options exercised (in shares) (4,588,738) (4,588,738) (2,138,491) (2,138,491)  
Weighted average exercise price of share options exercised in share-based payment arrangement (USD per share) | $ / shares $ 5.92   $ 5.42    
Share options outstanding at end of period (in shares) 4,509,645 4,509,645 9,102,323 9,102,323  
Weighted average remaining contractual life of outstanding share options 4 months 24 days 4 months 24 days 7 months 6 days 7 months 6 days  
Maximum term of awards granted | year 0.8 0.8 1.5 1.5  
Share options exercisable (in shares) 4,509,645 4,509,645 9,102,323 9,102,323  
Weighted average exercise price of share options exercisable in share-based payment arrangement (USD per share) | $ / shares $ 4.13 $ 4.13 $ 3.46 $ 3.46  
Class B          
Share Options [Abstract]          
Share options outstanding at beginning of period (in shares) | share 15,812,500 15,812,500 15,812,500 15,812,500  
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 0.77 $ 0.77 $ 0.77 $ 0.77 $ 0.77
Share options granted (in shares) | share 0 0 0 0  
Share options forfeited (in shares) | share 0 0 0 0  
Share options exercised (in shares) | share 0 0 0 0  
Share options outstanding at end of period (in shares) | share 15,812,500 15,812,500 15,812,500 15,812,500  
Weighted average remaining contractual life of outstanding share options 0 years 0 years 0 years 0 years  
Share options exercisable (in shares) | share 15,812,500 15,812,500 15,812,500 15,812,500  
Weighted average exercise price of share options exercisable in share-based payment arrangement (USD per share) | $ / shares $ 0.77 $ 0.77 $ 0.77 $ 0.77  
Restricted share units (RSU)          
Share Options [Abstract]          
Maximum term of awards granted 3.0 3.0 2.2 2.2  
Other Equity Instruments [Abstract]          
Other equity instruments outstanding at beginning of period (in shares) 849,504 849,504 75,496 75,496  
Instruments granted (in shares) 629,831 629,831 966,480 966,480  
Other equity instruments forfeited (in shares) (71,220) (71,220) (57,724) (57,724)  
Other equity instruments exercised (in shares) (519,510) (519,510) (134,748) (134,748)  
Other equity instruments outstanding at end of period (in shares) 888,605 888,605 849,504 849,504  
Weighted average contractual life remaining | year 0.9 0.9 1.0 1.0  
Other equity instruments exercisable (in shares) 2,000 2,000 39,705 39,705  
Performance share units (PSU)          
Share Options [Abstract]          
Maximum term of awards granted 2.2 2.2 2.2 2.2  
Other Equity Instruments [Abstract]          
Other equity instruments outstanding at beginning of period (in shares) 1,067,215 1,067,215 37,808 37,808  
Instruments granted (in shares) 834,743 834,743 1,034,815 1,034,815  
Other equity instruments forfeited (in shares) (21,962) (21,962) (5,408) (5,408)  
Other equity instruments exercised (in shares) 0 0 0 0  
Other equity instruments outstanding at end of period (in shares) 1,879,996 1,879,996 1,067,215 1,067,215  
Weighted average contractual life remaining | year 1.1 1.1 1.7 1.7  
Other equity instruments exercisable (in shares) 0 0 0 0