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v3.22.2.2

Shareholders' equity (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2022 shares | Jan. 17, 2022 shares | Sep. 30, 2021 shares | Sep. 30, 2022 SFr / shares shares | May 19, 2022 $ / shares | Dec. 31, 2021 SFr / shares shares | May 20, 2021 $ / shares | May 20, 2020 $ / shares
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Common Shares, par value | SFr / shares |  |  |  | SFr 24.15 |  | SFr 24.15 |  |
Common Shares in treasury, shares |  |  |  | 31,356,130 |  | 47,448,502 |  |
Treasury Stock, Shares, Retired | 13,179,100 | 14,465,400 |  | 27,644,500 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  | 2,470,600 |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  | $ 0.83 |  | $ 0.80 | $ 0.78
Annual dividend per share approved by shareholders | $ / shares |  |  |  |  | 3.32 |  | 3.20 | 3.12
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  | $ 0.83 |  | $ 0.80 | $ 0.78
Treasury Stock, Shares, Retired | 13,179,100 | 14,465,400 |  | 27,644,500 |  |  |  |
Nov 2020 Stock Repurchase Plan |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 8,412,000 |  |  |  |  |

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