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Share-based compensation plans (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]  
Schedule of number of stock options and weighted average exercisable price
(Number of options)
2022
2021
Beginning of year
3,458,001
6,158,539
Options granted
-
-
Options forfeited
-
(18,005)
Options expired
(2,475)
(886,009)
Options exercised [note 17]
(401,955)
(1,796,524)
End of year
3,053,571
3,458,001
Exercisable
3,053,571
3,162,415
2022
2021
Beginning of year
$16.72
$16.98
Options granted
-
-
Options forfeited
-
26.08
Options expired
26.81
22.05
Options exercised
 
23.96
14.90
End of year
$15.75
$16.72
Exercisable
$15.75
$16.85
Total options outstanding and exercisable
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
1,772,271
3.2
$14.57
1,772,271
$14.57
$
15.84
 
-
19.3
1,281,300
0.8
$17.39
1,281,300
$17.39
3,053,571
3,053,571
Compensation expense under equity settled plans
2022
2021
Employee share ownership plan
$
3,541
$
3,301
Restricted share unit plan
3,273
2,933
Performance share unit plan
(a)
-
1,237
Stock option plan
45
366
Total
$
6,859
$
7,837
(a)
 
There are
no
 
remaining PSUs whereby it is at the board’s discretion whether shares will be purchased on the open market
or redeemed for cash with an equivalent market value.
Expenses (recoveries) cash-settled plans
2022
2021
Performance share unit plan
$
11,221
$
25,784
Restricted share unit plan
9,342
6,890
Deferred share unit plan
2,811
6,741
Phantom stock option plan
751
2,261
Phantom restricted share unit plan
244
163
Total
$
24,369
$
41,839
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 1/22
Number of options granted
129,910
Average strike price
$31.17
Expected forfeitures
10%
Weighted average grant date fair values
$31.17
Cash Settled Plan [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Inputs measurement fair value of sharebased plans
Phantom
PSU
RSU
RSU
Number of units
238,610
159,140
10,142
Expected vesting
92%
-
-
Expected dividend
-
-
$0.08
Expected life of option
3
 
years
3
 
years
3
 
years
Expected forfeitures
9%
9%
7%
Weighted average measurement date fair values
$31.17
$31.17
$31.17
Phantom
Phantom
stock options
PSU
RSU
RSU
Number of units
94,135
1,255,255
815,098
21,148
Expected vesting
-
72%
-
-
Average strike price
$12.55
-
-
-
Expected dividend
$0.12
-
-
$0.12
Expected volatility
53%
-
-
-
Risk-free interest rate
3.8%
-
-
-
Expected life of option
3
 
years
0.7
 
years
0.8
 
years
1.4
 
years
Expected forfeitures
7%
2%
8%
8%
Weighted average measurement date fair values
$20.22
$30.69
$30.69
$30.69