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Common shares - Securities repurchase programs (Details) - USD ($) $ / shares in Units, $ in Millions | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 15, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2025 | Jul. 29, 2024
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 49,923,042 |  | 51,762,790 |
Common stock and Preference shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 175,000,000 |
Common stock |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 150,000,000 |  | 150,000,000 |
Par value per share (in dollars per share) |  | $ 0.01 |  | $ 0.01 |
Number of shares outstanding (in shares) |  | 49,923,042 |  | 51,762,790 |
Preference shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 25,000,000 |
Par value per share (in dollars per share) |  |  |  | $ 0.01 |
2022 Securities Repurchase Program | Common stock |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Entity's shares acquired (in shares) | 1,891,303 |  |  |  |
Common stock, par value (in dollars per share) | $ 50.27 |  |  |  |
2023 Securities Repurchase Program | Common stock |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Entity's shares acquired (in shares) | 6,500 | 4,653,189 | 8,069,020 |  |
Common stock, par value (in dollars per share) | $ 47.51 | $ 72.12 | $ 48.90 |  |
Additional amount authorized for purchase of treasury shares |  |  |  |  | $ 400.0
Stock buyback program, remaining authorized amount |  |  |  | $ 173.4 |

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