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Earnings per share - Schedule of Earnings per Share (Details) - CHF (SFr) SFr / shares in Units, SFr in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Earnings per share [line items] |  |  |
Net income / (loss) | SFr 57,700 | SFr (170,200) | SFr (27,500)
Class A shares |  |  |
Earnings per share [line items] |  |  |
Weighted number of outstanding shares (in shares) | 282,195,495 | 264,171,208 | 265,684,627
Number of shares with dilutive effects (in shares) | 2,354,500 | 0 | 0
Weighted number of outstanding shares (diluted and undiluted) (in shares) | 284,549,995 | 264,171,208 | 265,684,627
Net income / (loss) | SFr 51,400 | SFr (156,000) | SFr (27,500)
Basic EPS (CHF) (in CHF per share) | SFr 0.18 | SFr (0.59) | SFr (0.10)
Diluted EPS (CHF) (in CHF per share) | SFr 0.18 | SFr (0.59) | (0.10)
Class B Shares |  |  |
Earnings per share [line items] |  |  |
Weighted number of outstanding shares (in shares) | 345,437,500 | 241,333,048 |
Number of shares with dilutive effects (in shares) | 6,891,423 | 0 |
Weighted number of outstanding shares (diluted and undiluted) (in shares) | 352,328,923 | 241,333,048 |
Net income / (loss) | SFr 6,300 | SFr (14,200) |
Basic EPS (CHF) (in CHF per share) | SFr 0.02 | SFr (0.06) | 0
Diluted EPS (CHF) (in CHF per share) | SFr 0.02 | SFr (0.06) | SFr 0

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2022-03-24 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_66&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2022-03-24 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_67&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2022-03-24 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_66&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2022-03-24 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_67&doctype=Standard -URIDate 2022-03-24 + Details
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