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Shareholders' equity (Details) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 22, 2023 shares | Mar. 31, 2024 SFr / shares 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 | 14,925,028 | 14,925,028 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  | 1,983,550 |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | $ 0.86 | $ 0.83
Annual dividend per share approved by shareholders | $ / shares |  |  |  | 3.44 | 3.32
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | $ 0.86 | $ 0.83
Treasury Stock, Shares, Retired | 14,925,028 | 14,925,028 |  |  |
Treasury Stock, Common, Shares |  | 25,418,520 | 26,181,949 |  |
Common Shares, par value | SFr / shares |  | SFr 0.50 | SFr 0.50 |  |

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