v3.24.0.1
Share-based compensation - Narrative (Details)
SFr in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2023
CHF (SFr)
yr
year
Dec. 31, 2022
CHF (SFr)
year
Dec. 31, 2021
CHF (SFr)
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation     SFr 27.3 SFr 38.3 SFr 183.2
Expense from equity-settled share-based payment transactions     SFr 31.8 SFr 33.8  
Average expected fluctuation in expense recognition 10.00% 7.50%      
LTPP 2018 | RSUs          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period     3 years    
LTIP 2018          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Weighted average remaining contractual life of outstanding share options     0 years 0 years  
LTIP 2018 | RSUs          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting requirements anniversary of grant date options may be exercised | yr     5    
LTIP 2020 | Class A shares          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Weighted average remaining contractual life of outstanding share options     0 years 0 years  
LTIP 2020 | Class B          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Weighted average remaining contractual life of outstanding share options     0 years 0 years  
LTIP 2020 | RSUs          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting requirements anniversary of grant date options may be exercised | yr     7    
LTIP 2021          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Expense from equity-settled share-based payment transactions     SFr 24.4 SFr 32.7  
LTIP 2021 | RSUs | First anniversary of granting date          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage     34.00%    
LTIP 2021 | RSUs | First anniversary of granting date | Executive board          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage     33.00%    
LTIP 2021 | RSUs | Each quarter following the 1st anniversary of granting date          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage     8.25%    
LTIP 2021 | RSUs | Granting date | Executive board          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage     33.00%    
LTIP 2021 | RSUs | Second anniversary of granting date | Executive board          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting percentage     33.00%    
LTIP 2021 | PSUs          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting requirements anniversary of grant date options may be exercised | yr     3    
LTIP 2021 | PSUs | Performance cycle 1          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period     24 months    
Vesting requirements for share-based payment arrangement, performance cycle     2 years    
LTIP 2021 | PSUs | Performance cycle 1 | Executive board          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting requirements for share-based payment arrangement, performance cycle     2 years    
LTIP 2021 | PSUs | Performance cycle 2          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period     36 months    
Vesting requirements for share-based payment arrangement, performance cycle     3 years    
LTIP 2021 | PSUs | Performance cycle 2 | Executive board          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting requirements for share-based payment arrangement, performance cycle     3 years    
SLIA 2019          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Maximum term of awards granted | year     1.5 4.0  
SLIA 2019 | RSUs          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period         6 months
Other share-based compensation plans          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Expense from equity-settled share-based payment transactions     SFr 7.4 SFr 1.1