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Selling, general and administrative expenses - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items]      
Other long-term employee benefits SFr 206.6 SFr 142.1 SFr 87.3
Selling, general and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Depreciation and amortisation expense 57.1 40.0 28.7
Cost of sales      
Disclosure of attribution of expenses by nature to their function [line items]      
Depreciation expense SFr 7.7 SFr 6.4 SFr 2.7