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Related-Party Disclosures - Schedule of Compensation of Key Management Personnel and Directors of the Company (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information about key management personnel [abstract]
Salaries and other short-term employment benefits	CAD 11.3	CAD 12.3
Directors' fees	0.8	1.0
Share-based compensation	4.0	3.2
Total compensation	CAD 16.1	CAD 16.5

X

- Definition

The amount of remuneration paid or payable to the entity's directors.

+ References

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X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

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X

- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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- Definition

Disclosure of information about key management personnel.

+ References

No definition available.

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