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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangements [Abstract]  
Changes in number and exercise prices of other equity instruments SARs and TSARs units outstanding at December 31, 2022 and 2021 are as follows:
SARs
TSARs
Number of
units
Exercise
price USD
Number of
units
Exercise
price USD
Outstanding at December 31, 2020840,772 $      50.61 2,340,490 $ 45.43 
Granted
39,490 38.79338,260 38.79
Exercised
(30,151)34.06(50,623)33.89
Cancelled
(25,100)52.34(21,460)50.98
Expired
(158,755)71.10(226,430)73.13
Outstanding at December 31, 2021666,256 $          45.70 2,380,237 $42.05 
Granted
32,730 48.49266,090 48.49
Exercised
(129,162)37.17(290,577)35.94
Cancelled
(12,900)55.70(21,922)46.45
Expired
(149,237)55.66 (145,469)55.82 
Outstanding at December 31, 2022407,687 $44.67 2,188,359 $42.68 
Deferred, restricted and performance share units (old plan and new plan) outstanding as at December 31, 2022 and 2021 are as follows:
Number of
deferred share
units
Number of
restricted share
units
Number of
performance share
units (old plan)
Number of
performance share
units (new plan)
Outstanding at December 31, 2020122,947 228,872 146,801 443,170 
Granted
23,384 132,360 — 258,970 
Performance factor impact on redemption1
— — (110,354)— 
Granted in lieu of dividends
1,074 2,729 — 5,545 
Redeemed
(13,987)(6,103)(36,447)— 
Cancelled
— (25,473)— (17,997)
Outstanding at December 31, 2021133,418 332,385 — 689,688 
Granted
19,909 104,810 — 199,430 
Performance factor impact on redemption1
— — — (14,796)
Granted in lieu of dividends
2,434 5,561 — 11,764 
Redeemed
— (82,039)— (119,714)
Cancelled
— (19,788)— (21,485)
Outstanding at December 31, 2022155,761 340,929 — 744,887 
1     Performance share units have a feature where the ultimate number of units that vest are adjusted by a performance factor of the original grant as determined by the Company's total shareholder return in relation to a predetermined target over the period to vesting. These units relate to performance share units redeemed in the quarter ended March 31, 2021, and the quarter ended March 31, 2022.
Number and weighted average remaining contractual life of SARs and TSARs outstanding and exercisable Information regarding the SARs and TSARs outstanding as at December 31, 2022 is as follows:
Units outstanding at December 31, 2022Units exercisable at December 31, 2022
Range of exercise prices
Weighted average
remaining
contractual
life (years)
Number
of units
outstanding
Weighted
average
exercise
price
Number
of units
exercisable
Weighted
average
exercise
price
SARs


$29.27 to $35.51
2.86123,387$31.0291,327$31.63
$38.79 to $50.17
3.17161,34047.03102,28448.69
$54.65 to $78.59
2.38122,96055.28122,96055.28

2.84407,687$44.67316,571$46.33
TSARs
$29.27 to $35.51
3.56784,886$30.09535,876$30.47
$38.79 to $50.17
4.33838,66345.19351,24546.72
$54.65 to $78.59
2.66564,81056.48564,81056.48

3.622,188,359$42.681,451,931$44.52
SARs and TSARs outstanding and exercisable by range of exercise prices Information regarding the SARs and TSARs outstanding as at December 31, 2022 is as follows:
Units outstanding at December 31, 2022Units exercisable at December 31, 2022
Range of exercise prices
Weighted average
remaining
contractual
life (years)
Number
of units
outstanding
Weighted
average
exercise
price
Number
of units
exercisable
Weighted
average
exercise
price
SARs


$29.27 to $35.51
2.86123,387$31.0291,327$31.63
$38.79 to $50.17
3.17161,34047.03102,28448.69
$54.65 to $78.59
2.38122,96055.28122,96055.28

2.84407,687$44.67316,571$46.33
TSARs
$29.27 to $35.51
3.56784,886$30.09535,876$30.47
$38.79 to $50.17
4.33838,66345.19351,24546.72
$54.65 to $78.59
2.66564,81056.48564,81056.48

3.622,188,359$42.681,451,931$44.52
Weighted average assumptions of outstanding SARs and TSARs The fair value of each outstanding SARs and TSARs grant was estimated on December 31, 2022 and 2021 using the Black-Scholes option pricing model with the following weighted average assumptions:
20222021
Risk-free interest rate
4.4%0.7%
Expected dividend yield
1.9%1.3%
Expected life of SARs and TSARs (years)
1.81.7
Expected volatility
51%51%
Expected forfeitures
0%0%
Weighted average fair value (USD per unit)
$8.72 $8.81 
Changes in stock options issued
Common shares reserved for outstanding incentive stock options as at December 31, 2022 and 2021 are as follows:
Number of
stock
options
Weighted
average
exercise price
Outstanding at December 31, 2020173,251 $49.44 
Granted
6,880 38.79 
Exercised
(7,300)34.59 
Expired
(27,210)73.13 
Outstanding at December 31, 2021145,621 $45.25 
Granted
5,300 $48.49 
Exercised
(16,800)34.59 
Expired
(31,590)55.66 
Outstanding at December 31, 2022102,531 $43.96 
Stock options outstanding and exercisable by range of exercise prices
Information regarding the stock options outstanding as at December 31, 2022 is as follows:
Options outstanding at December 31, 2022Options exercisable at December 31, 2022
Range of exercise prices
Weighted
average
remaining
contractual
life (years)
Number of
stock
options
outstanding
Weighted
average
exercise
price
Number of
stock
options
exercisable
Weighted
average
exercise
price
Options
$29.27 to $35.51
1.7539,207 $32.4934,059 $32.98
$38.79 to $50.17
2.6636,214 47.7626,328 49.18
$54.65 to $78.59
2.4427,110 55.4627,110 55.46
2.25102,531 $43.9687,497 $44.82
Number and weighted average remaining contractual life of stock options outstanding and exercisable
Information regarding the stock options outstanding as at December 31, 2022 is as follows:
Options outstanding at December 31, 2022Options exercisable at December 31, 2022
Range of exercise prices
Weighted
average
remaining
contractual
life (years)
Number of
stock
options
outstanding
Weighted
average
exercise
price
Number of
stock
options
exercisable
Weighted
average
exercise
price
Options
$29.27 to $35.51
1.7539,207 $32.4934,059 $32.98
$38.79 to $50.17
2.6636,214 47.7626,328 49.18
$54.65 to $78.59
2.4427,110 55.4627,110 55.46
2.25102,531 $43.9687,497 $44.82