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Share-based compensation plans - Inputs used in the measurement - Cash (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CAD ($) shares yr $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 0 | 886,740 |
Average strike price | $ 0 | $ 15.27 |
Number of options, reporting date | shares | 6,158,539 | 8,617,097 | 8,820,805
Average strike price, reporting date | $ 17.73 | $ 18.9 |
Performance Share Unit Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 636,570 |  |
Expected vesting | 102.00% |  |
Average strike price | $ 0 |  |
Expected dividend | $ | $ 0 |  |
Expected volatility | 0.00% |  |
Risk-free interest rate | 0.00% |  |
Expected life of option | yr | 3 |  |
Expected forfeitures | 12.00% |  |
Weighted average grant date fair values | $ 11.45 |  |
Number of options, reporting date | shares | 1,720,636 |  |
Expected vesting, reporting date | 129.00% |  |
Expected dividend, reporting date | $ | $ 0 |  |
Expected volatility, reporting date | 22.00% |  |
Risk free interest rate, reporting date | 0.10% |  |
Expected life of option, reporting date | yr | 1 |  |
Expected forfeitures, reporting date | 11.00% |  |
Weighted average share price, reporting date | $ 22.01 |  |
Restricted Share Unit Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 423,180 |  |
Expected vesting | 0.00% |  |
Average strike price | $ 0 |  |
Expected dividend | $ | $ 0 |  |
Expected volatility | 0.00% |  |
Risk-free interest rate | 0.00% |  |
Expected life of option | yr | 3 |  |
Expected forfeitures | 12.00% |  |
Weighted average grant date fair values | $ 11.45 |  |
Number of options, reporting date | shares | 425,176 |  |
Expected vesting, reporting date | 0.00% |  |
Expected dividend, reporting date | $ | $ 0 |  |
Expected volatility, reporting date | 0.00% |  |
Risk free interest rate, reporting date | 0.00% |  |
Expected life of option, reporting date | yr | 2.2 |  |
Expected forfeitures, reporting date | 12.00% |  |
Weighted average share price, reporting date | $ 17.05 |  |
Phantom Stock Option Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options granted | shares | 112,140 |  |
Expected vesting | 0.00% |  |
Average strike price | $ 11.61 |  |
Expected dividend | $ | $ 0.08 |  |
Expected volatility | 39.00% |  |
Risk-free interest rate | 0.60% |  |
Expected life of option | yr | 4 |  |
Expected forfeitures | 8.00% |  |
Weighted average grant date fair values | $ 2.85 |  |
Number of options, reporting date | shares | 422,291 |  |
Expected vesting, reporting date | 0.00% |  |
Average strike price, reporting date | $ 15.66 | $ 16.48 |
Expected dividend, reporting date | $ | $ 0.08 |  |
Expected volatility, reporting date | 41.00% |  |
Risk free interest rate, reporting date | 0.30% |  |
Expected life of option, reporting date | yr | 3.4 |  |
Expected forfeitures, reporting date | 7.00% |  |
Weighted average share price, reporting date | $ 5.43 |  |

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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 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 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_c&doctype=Standard -URIDate 2020-01-01 + Details
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