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v3.23.2

Shareholders' equity (Details) |  |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 22, 2023 shares | Aug. 04, 2022 shares | Jan. 17, 2022 shares | Jun. 30, 2023 SFr / shares shares | May 17, 2023 $ / shares | Dec. 31, 2022 SFr / shares shares | May 19, 2022 $ / shares | May 20, 2021 $ / shares
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Common Shares, par value | SFr / shares |  |  |  | SFr 0.50 |  | SFr 24.15 |  |
Treasury Stock, Shares, Retired | 14,925,028 | 13,179,100 | 14,465,400 | 14,925,028 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  | 1,781,198 |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  | $ 0.86 |  | $ 0.83 | $ 0.80
Annual dividend per share approved by shareholders | $ / shares |  |  |  |  | 3.44 |  | 3.32 | 3.20
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  | $ 0.86 |  | $ 0.83 | $ 0.80
Treasury Stock, Shares, Retired | 14,925,028 | 13,179,100 | 14,465,400 | 14,925,028 |  |  |  |
Treasury Stock, Common, Shares |  |  |  | 20,760,232 |  | 31,781,758 |  |
Common Shares, par value | SFr / shares |  |  |  | SFr 0.50 |  | SFr 24.15 |  |

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