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Shareholders' equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 30, 2024 | Aug. 02, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 28, 2025 | Feb. 27, 2025 | Jul. 30, 2024
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Common shares, authorized (in shares) |  |  | 200,000,000 |  |  |  |  |
Common shares, par value (in dollars per share) |  |  | $ 1 | $ 1 |  |  |  |
Preference shares, authorized (in shares) |  |  | 500,000 |  |  |  |  |
Preference shares, outstanding (in shares) |  |  | 0 | 0 | 0 |  |  |
Share repurchase program, authorized amount |  | $ 200 |  |  |  |  |  | $ 500
Share repurchase program, authorized (in shares) | 172,351 | 678,110 |  |  |  |  |  |
Percent purchased of authorized amount |  | 80.00% |  |  |  |  |  |
Cost per share (in USD per share) | $ 235.17 | $ 235.95 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  | $ 300 | $ 300 |
Stock Option |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share (in shares) |  |  | 900,000 | 700,000 | 500,000 |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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