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Share capital - Schedule of Shares Redeemed Under Buyback Program (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 19, 2025 | Aug. 20, 2025 | Jun. 23, 2025 | Mar. 19, 2025 | Nov. 07, 2024 | Oct. 31, 2024 | Sep. 25, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 19, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | 866,512 | 560,100 | 1,717,181 | 1,360,537 | 479,524 | 409,512 | 337,070 | 1,717,181 | 1,360,537 | 953,593 | 1,426,612 | 4,504,330 | 2,179,699
Average price paid per share (in USD per share) | $ 173.33 | $ 178.20 | $ 145.59 | $ 183.75 | $ 221.87 | $ 228.57 | $ 296.67 |  |  | $ 209.73 |  | $ 166.51 | $ 229.39
Approximate dollar value of shares that may yet be purchased under the program (in millions) | $ 750.0 | $ 900.2 | $ 500.0 | $ 750.0 | $ 450.0 | $ 556.4 | $ 400.0 |  |  | $ 250.0 |  |  |

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