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Share repurchases - Narrative (Details) - March 2025 Normal Course Issuer Bid (NCIB) - CAD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2025 | Sep. 30, 2025 | Mar. 03, 2025
Share Repurchase Program [Line Items] |  |  |
Common Shares authorized to be repurchased |  |  | 37.3
Share repurchase program, change in accrued tax liability | $ 37 | $ 70 |

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- Definition Share Repurchase Program, Change in Accrued Tax Liability + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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- Details
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