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Share-based compensation plans - Inputs used in the measurement (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CAD ($) shares yr $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 886,740 | 1,473,430 |
Average strike price | $ 15.27 | $ 11.32 |
Number of options, reporting date | shares | 8,617,097 | 8,820,805 | 8,324,666
Average strike price, reporting date | $ 18.9 | $ 22.83 |
Stock Option Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 886,740 |  |
Expected vesting | 0.00% |  |
Average strike price | $ 15.27 |  |
Expected dividend | $ | $ 0.08 |  |
Expected volatility | 36.00% |  |
Risk-free interest rate | 1.80% |  |
Expected life of option | yr | 4.9 |  |
Expected forfeitures | 7.00% |  |
Weighted average grant date fair values | $ 4.92 |  |
Performance Share Unit Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 477,250 |  |
Expected vesting | 106.00% |  |
Average strike price | $ 0 |  |
Expected dividend | $ | $ 0 |  |
Expected volatility | 38.00% |  |
Risk-free interest rate | 1.80% |  |
Expected life of option | yr | 3 |  |
Expected forfeitures | 12.00% |  |
Weighted average grant date fair values | $ 15.33 |  |
Number of options, reporting date | shares | 1,465,618 |  |
Expected vesting, reporting date | 80.00% |  |
Average strike price, reporting date | $ 0 |  |
Expected dividend, reporting date | $ | $ 0 |  |
Expected volatility, reporting date | 31.00% |  |
Risk free interest rate, reporting date | 1.70% |  |
Expected life of option, reporting date | yr | 1.4 |  |
Expected forfeitures, reporting date | 10.00% |  |
Weighted average share price, reporting date | $ 10.07 |  |
Restricted Share Unit Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 212,496 |  |
Expected vesting | 0.00% |  |
Average strike price | $ 15.33 |  |
Expected dividend | $ | $ 0 |  |
Expected volatility | 0.00% |  |
Risk-free interest rate | 0.00% |  |
Expected life of option | yr | 0 |  |
Expected forfeitures | 15.00% |  |
Weighted average grant date fair values | $ 15.33 |  |
Phantom Stock Option Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 68,890 |  |
Expected vesting | 0.00% |  |
Average strike price | $ 15.27 |  |
Expected dividend | $ | $ 0.08 |  |
Expected volatility | 37.00% |  |
Risk-free interest rate | 1.50% |  |
Expected life of option | yr | 4.5 |  |
Expected forfeitures | 8.00% |  |
Weighted average grant date fair values | $ 5.07 |  |
Number of options, reporting date | shares | 406,720 |  |
Expected vesting, reporting date | 0.00% |  |
Average strike price, reporting date | $ 16.48 | $ 17.74 |
Expected dividend, reporting date | $ | $ 0.08 |  |
Expected volatility, reporting date | 35.00% |  |
Risk free interest rate, reporting date | 1.70% |  |
Expected life of option, reporting date | yr | 4 |  |
Expected forfeitures, reporting date | 8.00% |  |
Weighted average share price, reporting date | $ 2.14 |  |

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- Definition The amount of expected vesting used to calculate the fair value of share options. + References No definition available. + Details
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- Definition The option life of share options oustanding. + References No definition available. + Details
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- Definition The amount of an expected dividend used to calculate the fair value of share options. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the share options on the reporting date. + References No definition available. + 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 outstanding 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). + References No definition available. + Details
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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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average exercise price of share options exercisable 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 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average share price. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_c&doctype=Standard -URIDate 2019-03-27 + Details
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