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Common shares - Summary of Common Shares (Detail) - shares shares in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Equity [Abstract] |  |
Authorized (in shares) | 1,100,000 | 1,100,000
Common shares outstanding (in shares) | 496,861 | 509,045

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- Definition Number of shares of other common stock instruments held by shareholder, including, but not limited to, exchangeable shares. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + Details
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