Equity Incentive Schemes and Stock Compensation Charges - Schedule of Transactions for Share Option Plans (Details) - Stock Option and Award Plans - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Options Granted Under Plans | |||
| Beginning balance (in shares) | 622,292 | 902,806 | 1,378,119 |
| Granted (in shares) | 118,902 | 68,380 | 82,472 |
| Exercised (in shares) | (86,434) | (311,040) | (535,705) |
| Forfeited/expired (in shares) | (15,576) | (37,854) | (22,080) |
| Ending balance (in shares) | 639,184 | 622,292 | 902,806 |
| Vested and exercisable at end of period (in shares) | 523,267 | ||
| Weighted Average Exercise Price | |||
| Beginning balance (USD per share) | $ 170.52 | $ 142.96 | $ 119.86 |
| Granted (USD per share) | 185.18 | 325.51 | 232.48 |
| Exercised (USD per share) | 112.32 | 116.31 | 95.12 |
| Forfeited/expired (USD per share) | 252.40 | 238.51 | 196.20 |
| Ending balance (USD per share) | 179.12 | $ 170.52 | $ 142.96 |
| Vested and exercisable at end of period (USD per share) | $ 170.26 | ||
| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Gross number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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