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v3.25.2

Shareholders' equity (Details) |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 07, 2025 shares | May 21, 2024 shares | Jun. 30, 2025 SFr / shares shares | May 15, 2025 $ / 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 | 11,825,600 | 7,518,565 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares |  |  | 1,642,634 |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | $ 0.97 |  | $ 0.91 | $ 0.86
Annual dividend per share approved by shareholders | $ / shares |  |  |  | 3.88 |  | 3.64 | 3.44
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  | 0.97 |  | 0.91 | 0.86
Treasury Stock, Shares, Retired | shares | 7,518,565 | 11,825,600 | 7,518,565 |  |  |  |
Treasury Stock, Common, Shares | shares |  |  | 13,446,633 |  | 18,922,323 |  |
Common Shares, par value | SFr / shares |  |  | SFr 0.50 |  | SFr 0.50 |  |
Annual dividend per share approved by shareholders | $ / shares |  |  |  | $ 3.88 |  | $ 3.64 | $ 3.44

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