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Pension and other post-retirement benefits (Assumptions and 1% change) (Details) - CAD ($)	Dec. 31, 2024	Dec. 31, 2023
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

Dental cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

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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.

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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.

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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
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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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
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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
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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
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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

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