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Earnings per share (Tables)
12 Months Ended
Dec. 31, 2024
Earnings per share [abstract]  
Schedule of Earnings per share
202420242023202320222022
Class AClass BClass AClass BClass AClass B
Weighted number of outstanding shares288,465,380 345,437,500 284,262,802 345,437,500 282,195,495 345,437,500 
Weighted number of shares with dilutive effects3,787,481 12,822,456 3,306,122 11,446,403 2,354,500 6,891,423 
Weighted number of outstanding shares (diluted and undiluted)292,252,861 358,259,956 287,568,924 356,883,903 284,549,995 352,328,923 
Net income (CHF in millions)216.3 25.9 70.9 8.6 51.4 6.3 
Basic EPS (CHF)0.75 0.07 0.25 0.02 0.18 0.02 
Diluted EPS (CHF)0.74 0.07 0.25 0.02 0.18 0.02