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Shareholders' equity (Details) |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 21, 2024 shares | May 22, 2023 shares | Jun. 30, 2024 SFr / shares shares | May 16, 2024 $ / shares | Dec. 31, 2023 SFr / shares shares | May 17, 2023 $ / shares | May 19, 2022 $ / shares
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |
Common Shares, par value | SFr / shares |  |  | SFr 0.50 |  | SFr 0.50 |  |
Treasury Stock, Shares, Retired | shares | 11,825,600 | 14,925,028 | 11,825,600 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares |  |  | 2,278,215 |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | $ 0.91 |  | $ 0.86 | $ 0.83
Annual dividend per share approved by shareholders | $ / shares |  |  |  | 3.64 |  | 3.44 | 3.32
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | 0.91 |  | 0.86 | 0.83
Treasury Stock, Shares, Retired | shares | 11,825,600 | 14,925,028 | 11,825,600 |  |  |  |
Treasury Stock, Common, Shares | shares |  |  | 15,552,491 |  | 26,181,949 |  |
Common Shares, par value | SFr / shares |  |  | SFr 0.50 |  | SFr 0.50 |  |
Annual dividend per share approved by shareholders | $ / shares |  |  |  | $ 3.64 |  | $ 3.44 | $ 3.32

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