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STOCK-BASED COMPENSATION - Principal assumptions used to determine fair value of stock options (Details) | 12 Months Ended
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Dec. 31, 2017 CAD step | Dec. 31, 2016 CAD step
Share-based Payment Arrangements [Abstract] |  |
Weighted average fair value | CAD | CAD 8.52 | CAD 6.20
Risk-free interest rate | 0.80% | 0.50%
Dividend yield | 3.20% | 3.70%
Volatility of Class B Non-Voting Shares | 21.20% | 21.30%
Weighted average expected life | 5.5 | 4.8
Weighted average time to vest | 2 years 3 months 18 days | 2 years 4 months 24 days
Weighted average time to expiry | 9 years 10 months 24 days | 9 years 10 months 24 days
Employee exit rate | 3.90% | 3.90%
Suboptimal exercise factor | 1.4 | 1.5
Lattice steps | step | 50 | 50

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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 -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -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 + Details
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- 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 -Subparagraph a -Clause i -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 + Details
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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 -Paragraph 47 -Subparagraph a -Clause i -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 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -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 + Details
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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 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Description Of Other Inputs To Options Pricing Model, Lattice Steps, Share Options Granted + References No definition available. + Details
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- Definition Description Of Suboptimal Exercise Factor, Share Options Granted + References No definition available. + Details
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- Definition Expected Employee Exit Rate, Share Options Granted + References No definition available. + Details
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- Definition Share-based Payment Arrangements [Abstract] + References No definition available. + Details
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- Definition Weighted Average Expiration Period, Share Options Granted + References No definition available. + Details
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- Definition Weighted Average Vesting Period, Share Options Granted + References No definition available. + Details
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