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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, 2018 | Dec. 31, 2017
Pension plans [member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 3.70% | 3.40%
Discount rate - expense | 3.40% | 3.90%
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 | $ 8,475,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (6,548,000) |
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 | $ 2,481,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (2,281,000) |
Pension plans [member] | Increase of one year in the expected lifetime [member] |  |
Sensitivity analysis of actuarial assumptions |  |
Increase in defined benefit obligation | $ 1,245,000 |
Other Benefit Plans [Member] |  |
Assumptions defined benefit obligation and net pension and other benefit expense |  |
Discount rate - obligation | 3.90% | 3.40%
Discount rate - expense | 3.40% | 3.90%
Initial health care cost trend rate | 6.00% | 7.00%
Cost trend rate declines to | 5.00% | 5.00%
Year the rate reaches its final level | 2022 | 2021
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 | $ 3,503,000 |
Decrease in actuarial assumption by | 1.00% |
Decrease in defined benefit obligation | $ (2,784,000) |

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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. + 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 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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