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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |
Schedule of number of stock options and weighted average exercisable price |
(Number of options) | 2020 |  | 2019
Beginning of year | 8,617,097 |  | 8,820,805
Options granted | - |  | 886,740
Options forfeited | (81,991) |  | (270,025)
Options expired | (1,911,558) |  | (815,423)
Options exercised [note 16] | (465,009) |  | (5,000)
End of year | 6,158,539 |  | 8,617,097
Exercisable | 5,076,226 |  | 6,290,380
Weighted average exercise prices were as follows: |  |  |  |  |
|  | 2020 |  |  | 2019
Beginning of year |  | $17.44 |  |  | $19.75
Options granted |  | - |  |  | 15.27
Options forfeited |  | 22.22 |  |  | 22.59
Options expired |  | 20.14 |  |  | 38.43
Options exercised |  | 11.56 |  |  | 16.38
End of year |  | $16.98 |  |  | $17.44
Exercisable |  | $17.73 |  |  | $18.90
Total options outstanding and exercisable |
Total options outstanding and exercisable at December 31, 2020 were as follows:
|  |  |  |  | Options outstanding | Options exercisable
| Option price per share | Number |  | Weighted average remaining life | Weighted average exercisable price | Number | Weighted average exercisable price
| $11.32 - 15.83 | 3,060,721 |  |  | 5.0 |  | $13.72 | 1,978,408 |  | $13.85
| $15.84 - 26.81 | 3,097,818 |  |  | 1.8 |  | $20.21 | 3,097,818 |  | $20.21
|  | 6,158,539 |  |  |  |  |  | 5,076,226 |  |
The foregoing options have expiry dates ranging from February 28, 2021 to February 28, 2027.
Compensation expense under equity settled plans |
|  | 2020 |  |  | 2019
Stock option plan | $ | 1,011 |  | $ | 4,418
Performance share unit plan(a) |  | 2,650 |  |  | 7,245
Restricted share unit plan |  | 2,903 |  |  | 2,679
Employee share ownership plan |  | 3,174 |  |  | 3,127
Total | $ | 9,738 |  | $ | 17,469
(a) In the fourth quarter of 2019, the performance share unit plan was amended to allow eligible participants to elect payout of their grants in cash or shares, provided they have met their share ownership requirements. As a result, this plan is now considered cash-settled for new grants. Expenses related to PSUs granted in previous years will continue to appear as equity-settled if certain assumptions related to the calculation of fair value are met.
Expenses (recoveries) cash-settled plans |
|  | 2020 |  | 2019
Deferred share unit plan | $ | 3,765 | $ | (1,001)
Performance share unit plan |  | 20,287 |  | -
Phantom stock option plan |  | 1,340 |  | (436)
Restricted share unit plan(a) |  | 1,849 |  | -
Total | $ | 27,241 | $ | (1,437)
(a) Due to the inclusion of a new group of participants in the RSU plan that are able to elect cash settlement, grants to this group will appear as an expense of a cash-settled plan. Grants to the original group of participants are still disclosed as an expens e of an equity-settled plan.
Equity-settled plan [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
|  |  | Grant date
|  |  | Mar 1/20
Number of options granted |  |  | 283,426
Average strike price |  |  | $11.45
Expected forfeitures |  |  | 13%
Weighted average grant date fair values |  |  | $11.45
Cash Settled Plan [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
| PSU |  | RSU |  | Phantom stock options
| Grant date |  | Reporting date |  | Grant date |  | Reporting date |  | Grant date |  | Reporting date
| Mar 1/20 |  | Dec 31/20 |  | Mar 1/20 |  | Dec 31/20 |  | Mar 1/20 |  | Dec 31/20
Number of units | 636,570 |  | 1,720,636 |  | 423,180 |  | 425,176 |  | 112,140 |  | 422,291
Expected vesting | 102% |  | 129% |  | - |  | - |  | - |  | -
Average strike price | - |  | - |  | - |  | - |  | $11.61 |  | $15.66
Expected dividend | - |  | - |  | - |  | - |  | $0.08 |  | $0.08
Expected volatility(a) | - |  | 22% |  | - |  | - |  | 39% |  | 41%
Risk-free interest rate(a) | - |  | 0.1% |  | - |  | - |  | 0.6% |  | 0.3%
Expected life of option | 3.0 years |  | 1 year |  | 3.0 years |  | 2.2 years |  | 4 years |  | 3.4 years
Expected forfeitures | 12% |  | 11% |  | 12% |  | 12% |  | 8% |  | 7%
Weighted average |  |  |  |  |  |  |  |  |  |  |
measurement date fair values | $11.45 |  | $22.01 |  | $11.45 |  | $17.05 |  | $2.85 |  | $5.43
(a) During the first quarter of 2020, the vesting conditions of the PSU plan were amended such that total shareholder return is no longer included for new grants. Due to this change, expected volatility and the risk-free interest rate will no longer be considered in calculating the fair value of new grants.

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