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Shareholders' equity Schedule of Dividends Declared (Details)
12 Months Ended
Dec. 31, 2024
SFr / shares
Dec. 31, 2024
$ / shares
Dec. 31, 2023
SFr / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2022
SFr / shares
Dec. 31, 2022
$ / shares
Dividends Declared [Line Items]            
Total dividend distributions per common share | (per share) SFr 3.15 $ 3.59 SFr 3.05 $ 3.41 SFr 3.11 $ 3.29