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Pension and other post-retirement benefits - Defined benefit plans (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Actuarial loss (gain) arising from:
Administration	$ 141,552	$ 163,095
Pension plans [member]
Disclosure of benefit plans [line items]
Current service cost	1,670	1,544
Interest income or cost	(1,409)	(1,490)
Return on assets excluding interest income	292	2
Pension plans [member] | Plan assets [member]
Disclosure of benefit plans [line items]
Fair value of plan assets, beginning of year	8,061	8,652
Interest income or cost	259	320
Return on assets excluding interest income	(292)	(2)
Employer contributions	61	0
Actuarial loss (gain) arising from:
Benefits paid	(910)	(907)
Administration	(2)	(2)
Fair value of plan assets, end of year	7,177	8,061
Pension plans [member] | Defined benefit obligations [member]
Disclosure of benefit plans [line items]
Defined benefit obligation, beginning of year	55,972	54,930
Current service cost	1,670	1,544
Interest income or cost	1,668	1,810
Actuarial loss (gain) arising from:
- demographic assumptions	0	0
- financial assumptions	(3,776)	3,840
- experience adjustment	56	2,403
Past service cost	0	0
Benefits paid	(2,028)	(9,095)
Foreign exchange	709	540
Defined benefit obligation, end of year	54,271	55,972
Defined benefit liability	(47,094)	(47,911)
Other Benefit Plans [Member]
Disclosure of benefit plans [line items]
Current service cost	1,429	1,227
Interest income or cost	(946)	(945)
Return on assets excluding interest income	0	0
Actuarial loss (gain) arising from:
Past service cost	(1,929)	0
Defined benefit liability	(21,161)	(26,893)
Other Benefit Plans [Member] | Defined benefit obligations [member]
Disclosure of benefit plans [line items]
Defined benefit obligation, beginning of year	26,893	23,421
Current service cost	1,429	1,227
Interest income or cost	946	945
Actuarial loss (gain) arising from:
- demographic assumptions	(192)	0
- financial assumptions	(1,887)	2,076
- experience adjustment	(2,919)	50
Past service cost	(1,929)
Benefits paid	(1,180)	(826)
Foreign exchange	0	0
Defined benefit obligation, end of year	$ 21,161	$ 26,893

X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

No definition available.

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The amount of expenses that the entity classifies as being administrative.

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The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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