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Pension and other post-retirement benefits (Assumptions and 1% change) (Details) - CAD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Sensitivity analysis of actuarial assumptions |  |
Increase in actuarial assumption by | 1.00% | 1.00%
Decrease in actuarial assumption by | 1.00% | 1.00%
Percentage of the change in the other assumptions having no significant impact | 1.00% | 1.00%
Pension Plans [Member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 3.90% | 3.80%
Discount rate - expense | 3.80% | 4.50%
Rate of compensation increase | 2.90% | 2.90%
Pension Plans [Member] | Discount rate [Member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | $ (7,537,000) |
Decrease in defined benefit obligation | 9,601,000 |
Pension Plans [Member] | Rate of compensation increase [Member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | 1,978,000 |
Decrease in defined benefit obligation | (1,814,000) |
Pension Plans [Member] | Increase of one year in the expected lifetime [Member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | $ 474,000 |
Other Benefit Plans [Member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 4.60% | 4.60%
Discount rate - expense | 4.60% | 5.10%
Health care cost trend rate | 5.00% | 5.00%
Dental care cost trend rate | 4.50% | 4.50%
Other Benefit Plans [Member] | Discount rate [Member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | $ (2,434,000) |
Decrease in defined benefit obligation | $ 2,956,000 |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit expense. + References No definition available. + Details
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- Definition The reasonably possible percentage of the change in the other assumptions having no significant impact on the present value of defined benefit obligation. + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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