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Pension and other post-retirement benefits - Defined benefit plans (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Actuarial loss (gain) arising from:
Administration	$ 163,095	$ 206,652
Pension plans [member]
Disclosure of benefit plans [line items]
Current service cost	(1,544)	(1,634)
Interest income or cost	1,490	1,439
Return on assets excluding interest income	2	127
Actuarial loss (gain) arising from:
Defined benefit liability	(47,911)	(46,278)
Pension plans [member] | Plan assets [member]
Disclosure of benefit plans [line items]
Fair value of plan assets, beginning of year	8,652	10,632
Interest income or cost	320	403
Return on assets excluding interest income	(2)	(127)
Actuarial loss (gain) arising from:
Benefits paid	(907)	(2,254)
Administration	(2)	(2)
Fair value of plan assets, end of year	8,061	8,652
Pension plans [member] | Defined benefit obligations [member]
Disclosure of benefit plans [line items]
Defined benefit obligation, beginning of year	54,930	52,996
Current service cost	1,544	1,634
Interest income or cost	1,810	1,842
Actuarial loss (gain) arising from:
- financial assumptions	3,840	677
- experience adjustment	2,403	1,605
Benefits paid	(9,095)	(2,970)
Foreign exchange	540	(854)
Defined benefit obligation, end of year	55,972	54,930
Other Benefit Plans [Member]
Disclosure of benefit plans [line items]
Current service cost	(1,227)	(1,153)
Interest income or cost	945	900
Return on assets excluding interest income	0	0
Actuarial loss (gain) arising from:
Defined benefit liability	(26,893)	(23,421)
Other Benefit Plans [Member] | Defined benefit obligations [member]
Disclosure of benefit plans [line items]
Defined benefit obligation, beginning of year	23,421	21,771
Current service cost	1,227	1,153
Interest income or cost	945	900
Actuarial loss (gain) arising from:
- financial assumptions	2,076	373
- experience adjustment	50	161
Benefits paid	(826)	(937)
Foreign exchange	0	0
Defined benefit obligation, end of year	$ 26,893	$ 23,421

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from experience adjustments result in remeasurements of the net defined benefit liability (asset).

+ References

No definition available.

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- 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

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- Definition

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)]

+ References

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- Definition

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

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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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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)]

+ References

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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]]

+ References

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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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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. 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]]

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

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