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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |
Schedule of number of stock options and weighted avearge exercisable price |
(Number of options) | 2019 |  | 2018
Beginning of year | 8,820,805 |  | 8,324,666
Options granted | 886,740 |  | 1,473,430
Options forfeited | (270,025) |  | (315,340)
Options expired | (815,423) |  | (661,951)
Options exercised [note 16] | (5,000) |  | -
End of year | 8,617,097 |  | 8,820,805
Exercisable | 6,290,380 |  | 6,007,557
Weighted average exercise prices were as follows: |  |  |  |  |
|  | 2019 |  |  | 2018
Beginning of year |  | $19.75 |  |  | $22.19
Options granted |  | 15.27 |  |  | 11.32
Options forfeited |  | 22.59 |  |  | 25.43
Options expired |  | 38.43 |  |  | 28.90
Options exercised |  | 16.38 |  |  | -
End of year |  | $17.44 |  |  | $19.75
Exercisable |  | $18.90 |  |  | $22.83
Total options outstanding and exercisable |
Total options outstanding and exercisable at December 31, 2019 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 | 3,733,210 |  |  | 5.7 |  | $13.50 | 1,406,493 |  | $13.52
| $15.84 - 26.81 | 4,883,887 |  |  | 1.9 |  | $20.45 | 4,883,887 |  | $20.45
|  | 8,617,097 |  |  |  |  |  | 6,290,380 |  |
The foregoing options have expiry dates ranging from May 14, 2020 to February 28, 2027.
Compensation expense under equity settled plans |
|  | 2019 |  |  | 2018
Stock option plan | $ | 4,418 |  | $ | 4,744
Performance share unit plan(a) |  | 7,245 |  |  | 7,690
Restricted share unit plan |  | 2,679 |  |  | 2,542
Employee share ownership plan |  | 3,127 |  |  | 3,845
Total | $ | 17,469 |  | $ | 18,821
(a) In the fourth quarter, 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. This amount represents the expense recorded prior to the plan modification.
Expenses (recoveries) cash-settled plans |
|  | 2019 |  | 2018
Deferred share unit plan | $ | (1,001) | $ | 2,922
Performance share unit plan(a) |  | - |  | -
Phantom stock option plan |  | (436) |  | 675
Total | $ | (1,437) | $ | 3,597
(a) The modification to the PSU plan resulted in a reclassification, at the date of modification, of $8,369,000 from equity to liabilities. The liability recognized on the date of the modification was less than the amount previously recognized as an increase in equity. Since the plan modification did not change the performance and vesting criteria, no incremental fair value was granted.
Equity-settled plan [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
| Stock option plan | PSU | RSU
Number of options granted |  |  | 886,740 |  | 477,250 |  | 212,496
Expected vesting |  |  | - |  | 106% |  | -
Average strike price |  |  | $15.27 |  | - |  | $15.33
Expected dividend |  |  | $0.08 |  | - |  | -
Expected volatility |  |  | 36% |  | 38% |  | -
Risk-free interest rate |  |  | 1.8% |  | 1.8% |  | -
Expected life of option |  |  | 4.9 years |  | 3.0 years |  | -
Expected forfeitures |  |  | 7% |  | 12% |  | 15%
Weighted average grant date fair values |  |  | $4.92 |  | $15.33 |  | $15.33
Phantom Stock Option Plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
| PSUs |  | Phantom stock options
| Grant date |  | Reporting date |  | Grant date |  | Reporting date
| Mar 1, 2019 |  | Dec 31, 2019 |  | Mar 1, 2019 |  | Dec 31, 2019
Number of units | 477,250 |  | 1,465,618 |  | 68,890 |  | 406,720
Expected vesting | 106% |  | 80% |  | - |  | -
Average strike price | - |  | - |  | $15.27 |  | $16.48
Expected dividend | - |  | - |  | $0.08 |  | $0.08
Expected volatility | 38% |  | 31% |  | 37% |  | 35%
Risk-free interest rate | 1.8% |  | 1.7% |  | 1.5% |  | 1.7%
Expected life of option | 3.0 years |  | 1.4 years |  | 4.5 years |  | 4.0 years
Expected forfeitures | 12% |  | 10% |  | 8% |  | 8%
Weighted average measurement date fair values | $15.33 |  | $10.07 |  | $5.07 |  | $2.14

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