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Common shares - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 $ / shares shares | Aug. 31, 2024 $ / shares | May 31, 2024 $ / shares | Apr. 30, 2024 $ / shares | Apr. 30, 2013 shares | Feb. 15, 2023 $ / shares shares | Dec. 31, 2025 shares $ / shares | Dec. 31, 2024 shares $ / shares | Dec. 31, 2023 shares $ / shares | Sep. 30, 2025 $ / shares shares | Mar. 31, 2025 $ / shares shares | Jul. 29, 2024 USD ($) | Feb. 29, 2024 $ / shares shares | Dec. 31, 2021 shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  |  | 51,762,790 |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) | 26,042,709 |  |  |  |  |  | 26,049,209 | 26,042,709 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of vesting period for restricted stock grants |  |  |  |  |  |  | 1 year | 1 year | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of vesting period for restricted stock grants |  |  |  |  |  |  | 5 years | 5 years | 5 years |  |  |  |  |
2013 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Maximum years grants are exercisable |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted (in shares) |  |  |  |  |  |  | 1,847,748 | 1,472,800 |  |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  |  |  |  |  | $ 44.79 |  |  |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted (in shares) |  |  |  |  |  |  | 1,847,748 |  |  |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  |  |  |  |  | $ 44.79 | $ 71.49 | $ 55.61 |  |  |  |  |
Remaining shares available for issuance (in shares) |  |  |  |  |  |  | 1,500 |  |  |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted (in shares) |  |  |  |  |  |  | 748,000 |  |  |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees | First vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees | Second vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees | Third vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted (in shares) |  |  |  |  |  |  | 37,500 |  |  |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  |  |  |  |  | $ 58.49 |  |  |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Directors | First vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Directors | Second vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Directors | Third vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees, Directors and SSH Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares |  |  |  | $ 71.40 |  |  | $ 34.40 |  | $ 55.57 |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | Employees and SSH Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, granted (in shares) |  |  |  |  |  |  | 1,062,248 | 1,472,800 | 1,817,750 |  |  |  |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares | $ 47.40 | $ 70.82 | $ 72.59 |  |  |  | $ 40.17 |  | $ 55.89 |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | SSH Employees | First vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | SSH Employees | Second vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Restricted Stock | 2013 Equity Incentive Plan | SSH Employees | Third vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested shares percentage |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Number of shares issued (in shares) | 49,923,042 |  |  |  |  |  | 51,762,790 | 49,923,042 |  |  |  |  |  |
Number of shares outstanding (in shares) | 49,923,042 |  |  |  |  |  | 51,762,790 | 49,923,042 |  |  |  |  |  |
Common stock | 2023 Securities Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount authorized for purchase of treasury shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |
Entity's shares acquired (in shares) |  |  |  |  |  | 6,500 |  | 4,653,189 | 8,069,020 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 47.51 |  | $ 72.12 | $ 48.90 |  |  |  |  |
Common stock | 2022 Securities Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) | $ / shares |  |  |  |  |  | $ 50.27 |  |  |  |  |  |  |  |
Common stock | 2013 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 748,000 | 1,089,407 |  | 1,463,294 | 8,690,893
Par value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |

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