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Pension and other post-retirement benefits - Assumptions and 1% change (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Pension plans [member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 3.00% | 3.70%
Discount rate - expense | 3.70% | 3.40%
Rate of compensation increase | 3.00% | 3.00%
Pension plans [member] | Discount rate [member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in actuarial assumption by | 1.00% |
Increase in defined benefit obligation | $ 10,595,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (8,141,000) |
Pension plans [member] | Rate of compensation increase [member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in actuarial assumption by | 1.00% |
Increase in defined benefit obligation | $ 2,832,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (2,608,000) |
Pension plans [member] | Increase of one year in the expected lifetime [member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | $ 1,621,000 |
Other Benefit Plans [Member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 3.10% | 3.90%
Discount rate - expense | 3.90% | 3.40%
Initial health care cost trend rate | 6.00% | 6.00%
Cost trend rate declines to | 5.00% | 5.00%
Year the rate reaches its final level | 2022 | 2022
Dental care cost trend rate | 5.00% | 5.00%
Other Benefit Plans [Member] | Discount rate [member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in actuarial assumption by | 1.00% |
Increase in defined benefit obligation | $ 4,133,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (3,284,000) |

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- Definition Declining cost rate related to medical costs used as significant actuarial assumption to determine the present value of a defined benefit obligation. + References No definition available. + Details
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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. + Details
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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 year in which the rate reaches its final level, in CCYY format. + 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 [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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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 [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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