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Share capital - Schedule of Shares Redeemed Under Buyback Program (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 23, 2025 | Mar. 19, 2025 | Nov. 07, 2024 | Oct. 31, 2024 | Sep. 25, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 19, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | 1,717,181 | 1,360,537 | 479,524 | 409,512 | 337,070 | 1,717,181 | 1,360,537 | 953,593 |  |  | 3,077,718 | 2,179,699
Average price paid per share (in USD per share) | $ 145.59 | $ 183.75 | $ 221.87 | $ 228.57 | $ 296.67 |  |  | $ 209.73 |  |  | $ 162.46 | $ 229.39
Approximate dollar value of shares that may yet be purchased under the program (in millions) | $ 500,000 | $ 750,000 | $ 450,000 | $ 556,400 | $ 400,000 | $ 500,000 |  | $ 250,000 | $ 500,000 |  | $ 500,000 |
Share repurchase program, value of shares repurchased |  |  |  |  |  | $ 250,000 | $ 250,000 |  | $ 250,000 | $ 250,000 |  | $ 500,000

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