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Share-based compensation - Schedule of Valuation Inputs (Details) - SFr / shares
Dec. 16, 2024
Sep. 23, 2024
Jul. 10, 2024
Jun. 24, 2024
Mar. 25, 2024
Dec. 18, 2023
Sep. 26, 2023
Jun. 23, 2023
Apr. 01, 2023
Mar. 28, 2023
Mar. 27, 2023
Mar. 09, 2023
Jan. 03, 2023
Class A | Tax Recognition                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Share price on measurement date (CHF per share)                         SFr 20.84
RSU and PSU | LTIP 2021                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Share price on measurement date (CHF per share) SFr 51.65 SFr 42.74   SFr 34.88 SFr 31.07 SFr 26.52 SFr 23.81 SFr 26.72 SFr 28.34 SFr 27.34   SFr 19.87  
RSU and PSU | The Board of Directors of On (BoD) 2019                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Share price on measurement date (CHF per share) SFr 51.65 SFr 42.74   SFr 34.88 SFr 31.07                
Restricted share units (RSU) | The Board of Directors of On (BoD) 2019                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Share price on measurement date (CHF per share)     SFr 32.94               SFr 27.71