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Share-based payments - Fair Value Assumptions (Details)	12 Months Ended
	Dec. 31, 2018 CAD ($) year
Share-based Payment Arrangements [Abstract]
Weighted average fair value per option granted (CAD per share)	$ 2.13
Weighted average share price (CAD per share)	57
Weighted average exercise price (CAD per share)	$ 56
Dividend yield	5.00%
Expected volatility	12.00%
Risk-free interest rate	2.00%
Expected life (years) | year	4

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- Definition

Share-based Payment Arrangements [Abstract]

+ References

No definition available.

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- 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
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-IssueDate 2018-01-01
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- Definition

The option life of share options granted.

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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

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The exercise price of share options granted.

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

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

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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