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Selling, general and administrative expenses - Narrative (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]      
Other long-term employee benefits SFr 285.7 SFr 206.6 SFr 142.1
Selling, general and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Depreciation and amortisation expense 95.1 57.1 40.0
Cost of sales      
Disclosure of attribution of expenses by nature to their function [line items]      
Depreciation expense SFr 9.4 SFr 7.7 SFr 6.4