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Employee benefit obligations - Sensitivity Analysis for Actuarial Assumptions (Details) - CHF (SFr) SFr in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | SFr 1.6 | SFr 2.3
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | SFr (1.4) | (1.9)
Expected rate of salary increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | SFr (0.4) | (0.5)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | SFr 0.4 | 0.5
Life expectancy |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Period of reasonably possible decrease in actuarial assumption | 1 year |
Period of reasonably possible increase in actuarial assumption | 1 year |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | SFr (0.2) | (0.3)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | SFr 0.2 | SFr 0.3

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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