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Shareholders' equity - Additional information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 09, 2025 | Feb. 28, 2025 | Sep. 28, 2025 | Sep. 29, 2024 | Sep. 28, 2025 | Sep. 29, 2024 | Jul. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Antidilutive shares which were not included in the calculation of earnings per share (in shares) |  |  | 1,300,000 | 900,000 | 1,300,000 | 900,000 |
Share repurchase program, authorized amount |  | $ 300 |  |  |  |  | $ 500
Share repurchase program, authorized (in shares) | 493,150 | 1,725,253 |  |  |  |  |
Percent purchased of authorized amount |  | 80.00% |  |  |  |  |
Cost per share (in USD per share) | $ 135.23 | $ 139.11 |  |  |  |  |
Share-Based Payment Arrangement |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Antidilutive shares which were not included in the calculation of earnings per share (in shares) |  |  | 100,000 |  | 100,000 |  |

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