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Shareholders' equity (Details)
 3 Months Ended
Mar. 07, 2025
shares
Mar. 31, 2025
SFr / shares
shares
Dec. 31, 2024
SFr / shares
shares
May 16, 2024
$ / shares
May 17, 2023
$ / shares
Stockholders' Equity Note [Abstract]          
Common Shares, par value | SFr / shares   SFr 0.50 SFr 0.50    
Treasury Stock, Shares, Retired | shares 7,518,565 7,518,565      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares   1,390,604      
Common Stock, Dividend Rate Approved | $ / shares       $ 0.91 $ 0.86
Annual dividend per share approved by shareholders | $ / shares       3.64 3.44
Equity, Class of Treasury Stock [Line Items]          
Common Stock, Dividend Rate Approved | $ / shares       0.91 0.86
Treasury Stock, Shares, Retired | shares 7,518,565 7,518,565      
Treasury Stock, Common, Shares | shares   11,358,936 18,922,323    
Common Shares, par value | SFr / shares   SFr 0.50 SFr 0.50    
Annual dividend per share approved by shareholders | $ / shares       $ 3.64 $ 3.44