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Share-Based Compensation And Other Related Information - Assumptions (Details)	12 Months Ended
	Dec. 31, 2018 CAD ($) year	Dec. 31, 2017 CAD ($) year
Disclosure of share-based payment arrangements [Abstract]
Expected life | year	4.0	4.0
Expected volatility	43.80%	41.90%
Expected dividend yield	2.10%	2.60%
Risk-free interest rate	2.50%	2.20%
Weighted average exercise price (CAD$)	$ 17.53	$ 18.64
Weighted average fair value (CAD$)	$ 5.90	$ 5.30

X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph a
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
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-URIDate 2017-03-09

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

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-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
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- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
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- Definition

Disclosure of share-based payment arrangements [Abstract]

+ References

No definition available.

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