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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of share capital, reserves and other equity interest [Abstract]  
Schedule of cash dividends paid
Cash dividends paid to shareholders are as follows for each of the years in the three-year period ended December 31, 2021:
Declared DatePaid datePer common
share
amount		Shareholder
record date		Common
shares issued
and
outstanding
Aggregate
payment (1)
$$
March 12, 2019March 29, 20190.1400 March 22, 201958,665,310 8,189 
May 8, 2019June 28, 20190.1400 June 14, 201958,877,185 8,352 
August 7, 2019September 30, 20190.1475 September 16, 201958,877,185 8,709 
November 8, 2019December 30, 20190.1475 December 16, 201958,939,685 8,742 
March 12, 2020March 31, 20200.1475 March 23, 202059,009,685 8,807 
May 12, 2020June 30, 20200.1475 June 15, 202059,009,685 8,651 
August 12, 2020September 30, 20200.1475 September 15, 202059,009,685 8,574 
November 11, 2020December 31, 20200.1575 December 16, 202059,019,546 9,354 
March 11, 2021March 31, 20210.1575 March 22, 202159,027,047 9,237 
May 11, 2021June 30, 20210.1575 June 16, 202159,027,047 9,214 
August 10, 2021September 30, 20210.1700 September 16, 202159,284,947 10,039 
November 11, 2021December 31, 20210.1700 December 17, 202159,284,947 10,151 
(1)Aggregate dividend payment amounts presented in the table above are adjusted for the impact of foreign exchange rates on cash payments to shareholders.
Schedule of changes in number of options outstanding
The changes in number of stock options outstanding were as follows for each of the years in the three-year period ended December 31, 2021:
 202120202019
 Weighted
average
exercise
price		Number of
options		Weighted
average
exercise
price		Number of
options		Weighted
average
exercise
price		Number of
options
 CDN$ CDN$ CDN$ 
Balance, beginning of year11.25 2,449,222 16.49 1,010,901 14.59 1,009,793 
Granted29.34 243,152 7.94 1,533,183 17.54 392,986 
Exercised12.90 (257,900)19.94 (17,362)12.34 (359,375)
Forfeited— — 12.34 (77,500)15.85 (32,503)
Balance, end of year12.88 2,434,474 11.25 2,449,222 16.49 1,010,901 
Schedule of stock options outstanding and exercisable
The following table summarizes information about stock options outstanding and exercisable for each of the years in the three-year period ended December 31, 2021:
 Options outstandingOptions exercisable
Range of exercise prices (CDN$)NumberWeighted
average
contractual
life (years)		Weighted
average
exercise price		NumberWeighted
average
exercise price
  CDN$ CDN$
December 31, 2021
$7.941,501,231 5.827.94 479,111 7.94 
$12.55
140,000 2.2112.55 140,000 12.55 
$17.54338,604 4.8417.54 215,109 17.54 
$21.76211,487 3.9721.76 211,487 21.76 
$29.34243,152 6.4729.34 — — 
2,434,474 5.3812.88 1,045,707 13.33 
December 31, 2020
$7.94
1,533,183 6.767.94 — — 
$12.04 to $12.55
320,000 2.8212.30 320,000 12.30 
$17.54362,982 5.6717.54 115,994 17.54 
$21.76233,057 4.7121.76 152,084 21.76 
2,449,222 5.8911.25 588,078 15.78 
December 31, 2019
$12.04 to $12.55
397,500 3.1312.30 397,500 12.30 
$17.54
370,483 6.6217.54 — — 
$21.76242,918 5.6121.76 80,973 21.76 
1,010,901 5.0116.49 478,473 13.90 
Schedule of assumptions to calculate weighted average fair value of other equity instruments The following table summarizes information about the weighted average fair value of stock options granted during each of the years in the three-year period ending December 31, 2021, including the weighted average assumptions used in the model:
December 31, 2021December 31, 2020December 31, 2019
Weighted average fair value of stock options granted$4.25$0.44$2.21
Weighted average model assumptions:
Expected life5.5 years5.5 years4.9 years
Expected volatility (1)
27.63 %34.18 %29.79 %
Risk-free interest rate1.09 %0.75 %1.44 %
Expected dividends3.07 %10.79 %4.27 %
Stock price at grant dateCDN$ 29.34CDN$ 7.94CDN$ 17.54
Exercise price of awardsCDN$ 29.34CDN$ 7.94CDN$ 17.54
Foreign exchange rate USD to CDN1.24821.45261.3380
(1)Expected volatility was calculated by applying a weighted average of the daily closing price on the TSX for a term commensurate with the expected life of the grant.
The weighted average fair value of PSUs granted in the three-year period ended December 31, 2021 were based 50% on the VWAP of the Company's common shares on the TSX for the five trading days immediately preceding the grant date and 50% based on a Monte Carlo simulation model implemented in a risk-neutral framework considering the assumptions presented in the following table:
 202120202019
5 day VWAP at grant dateCDN$ 29.78CDN$ 8.63CDN$ 18.31
Monte Carlo simulation model assumptions:
Expected life3 years3 years3 years
Expected volatility (1)
45 %36 %25 %
US risk-free interest rate0.28 %0.3 %2.36 %
Canadian risk-free rate0.46 %0.59 %1.6 %
Expected dividends (2)
CDN$ 0.00CDN$ 0.00CDN$ 0.00
Performance period starting price (3)
CDN$ 24.20CDN$ 16.25CDN$ 16.36
Stock price as of estimation date CDN$ 29.27CDN$ 7.24CDN$ 18.06

(1)Expected volatility was calculated based on the daily dividend adjusted closing price change on the TSX for a term commensurate with the expected life of the grant.
(2)A participant will receive a cash payment from the Company upon PSU settlement that is equivalent to the number of settled PSUs multiplied by the amount of cash dividends per share declared and paid by the Company between the date of grant and the settlement date. As such, there is no impact from expected future dividends in the Monte Carlo simulation model.
(3)The performance period starting price is measured as the VWAP for the common shares of the Company on the TSX on the grant date.
Schedule of changes in number of other equity instruments outstanding
The following table summarizes information about RSUs for each of the years in the three-year period ended December 31, 2021:
202120202019
RSUs granted81,981 281,326 120,197 
Weighted average fair value per RSU granted$23.88 $6.07 $13.74 
 RSUs forfeited3,349 8,643 7,412 
RSUs settled106,906 — — 
Weighted average fair value per RSU settled23.84 — — 
Cash settlements (1)
2,733 — — 
(1)    Includes a cash payment of dividend equivalents on RSUs equaling the product that results from multiplying the number of settled RSUs by the amount of cash dividends per common share declared and paid by the Company from the date of grant of the RSUs to the settlement date.
The following table summarizes information about RSUs outstanding as of:
December 31,
2021		December 31,
2020
RSUs outstanding469,468 497,287 
Weighted average fair value per RSU outstanding$20.21 $18.91 
The following table summarizes information about PSUs for each of the years in the three-year period ended December 31, 2021:
 202120202019
PSUs granted 200,982 694,777 291,905 
Weighted average fair value per PSU granted$29.02 $5.59 $14.28 
PSUs forfeited/cancelled10,046 25,923 23,739 
PSUs added/(cancelled) by performance factor (1)
143,512 (346,887)(401,319)
PSUs settled409,670 — — 
Weighted average fair value per PSU settled$23.84 $— $— 
Cash payment on settlement (2)
$10,472 $— $— 
(1)The table below provides further information regarding the PSUs settled included in the table above. The number of PSUs settled reflects the performance adjustments to the Target Shares:
Grant DateDate SettledTarget SharesPerformancePSUs settled
March 21, 2016March 21, 2019371,158 0 %— 
December 20, 2016December 20, 201930,161 0 %— 
March 20, 2017March 20, 2020346,887 0 %— 
March 21, 2018March 23, 2021266,158 153.9 %409,670 
(2)    Includes a cash payment of dividend equivalents on PSUs equaling the product that results from multiplying the number of settled PSUs by the amount of cash dividends per common share declared and paid by the Company from the date of grant of the PSUs to the settlement date.
The following table summarizes information about PSUs outstanding as of:
December 31,
2021		December 31,
2020
PSUs outstanding1,149,196 1,223,053 
Weighted average fair value per PSU outstanding$29.35 $28.53 
The following table summarizes information about DSUs for each of the years in the three-year period ended December 31, 2021:
202120202019
DSUs granted67,554 115,114 72,434 
Weighted average fair value per DSU granted$22.93 $10.26 $13.83 
The following table summarizes information about DSUs outstanding as of:
December 31,
2021		December 31,
2020
DSUs outstanding454,095 386,541 
Weighted average fair value per DSU outstanding$20.21 $18.91 
Schedule of performance percentage of awards granted
The PSUs granted prior to December 31, 2017 were eligible to vest from 0% to 150% of the Target Shares ("Target Shares" reflects 100% of the PSUs granted) based on the Company's total shareholder return ("TSR") ranking relative to a specified peer group of companies (the "Peer Group") over the measurement period as outlined in the table below:
TSR Ranking Relative to the Peer GroupPercent of Target Shares Vested
76th percentile or higher150 %
51st-75th percentile100 %
25th-50th percentile 50 %
Less than the 25th percentile 0 %
As amended, the TSR performance adjustment factor was determined as follows (interpolated on a straight-line basis):
TSR Ranking Relative to the Peer GroupPercent of Target Shares Vested
75th percentile or above150 %
50th percentile100 %
25th percentile50 %
Less than the 25th percentile 0 %
The relative TSR performance adjustment factor is determined as follows:

TSR Ranking Relative to the Index Group/Peer GroupPercent of Target Shares Vested
90th percentile or higher 200 %
75th percentile150 %
50th percentile100 %
25th percentile 50 %
Less than the 25th percentile 0 %

The ROIC Performance adjustment factor is determined as follows:

ROIC Performance Percent of Target Shares Vested
1st Tier0 %
2nd Tier50 %
3rd Tier100 %
4th Tier150 %
Based on the Company’s performance adjustment factors as of December 31, 2021, the number of PSUs earned if all of the outstanding awards were to be settled at December 31, 2021, would be as follows:
Grant DatePerformance
March 21, 2019127.1 %
March 23, 2020157.6 %
March 22, 2021118.0 %
Schedule of share-based compensation expense and liabilities
The following table summarizes share-based compensation expense (benefit) recorded in earnings in SG&A for each of the years in the three-year period ended December 31, 2021:
202120202019
$$$
Stock options879 738 701 
PSUs15,253 14,829 (2,057)
DSUs1,546 3,819 914 
RSUs3,977 3,493 943 
21,655 22,879 501 
The following table summarizes share-based liabilities recorded in the consolidated balance sheets for the years ended:
December 31,
2021		December 31,
2020
Share-based compensation liabilities, current$$
PSUs (1)
7,921 8,446 
DSUs (2)
8,852 

7,354 
RSUs (1)
2,316 1,969 
19,089 17,769 
Share-based compensation liabilities, non-current
PSUs (1)
15,850 10,743 
RSUs (1)
4,000 2,921 
19,850 13,664 

(1)     Includes dividend equivalents accrued on awards.
(2)    Includes dividend equivalent grants.
Schedule of activity in contributed surplus
The following table summarizes the activity in the consolidated changes in equity under the caption contributed surplus for each of the years in the three-year period ended December 31, 2021:
202120202019
 $$$
Change in excess tax benefit on exercised share-based awards(672)— (38)
Change in excess tax benefit on outstanding share-based awards824 5,306 21 
Share-based compensation expense credited to capital on options exercised(737)(50)(976)
Share-based compensation expense for stock options879 738 701 
Increase (decrease) in contributed surplus294 5,994 (292)