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Foreign currency risk - Schedule of Sensitivity of Foreign Exchange Rates (Details) - Currency risk - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Sensitivity analysis for types of market risk, reasonably possible Change in risk variable, percent | 10.00% |  |
United States of America, Dollars |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD/CHF and EUR CHF +10% | SFr 32.1 | SFr 61.1 | SFr 6.0
Change in USD/CHF and EUR CHF -10% | (32.1) | (61.1) | (6.0)
Euro Member Countries, Euro |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD/CHF and EUR CHF +10% | 1.1 | 0.4 | 0.2
Change in USD/CHF and EUR CHF -10% | SFr (1.1) | SFr (0.4) | SFr (0.2)

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