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