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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangements [Abstract]  
Schedule of changes in number and exercise prices of other equity instruments SARs and TSARs units outstanding at December 31, 2024 and 2023 are as follows:
SARsTSARs
Number of
units		Exercise
price USD		Number of
units		Exercise
price USD
Outstanding at December 31, 2022407,687 $      44.67 2,188,359 $ 42.68 
Granted
51,160 50.49169,190 50.49
Exercised
(50,715)33.85(336,535)31.88
Cancelled
(5,600)53.69(13,544)51.36
Outstanding at December 31, 2023402,532 $          46.65 2,007,470 $45.10 
Granted
83,840 43.13255,540 42.58
Exercised
(30,557)37.10(185,957)33.49
Cancelled
(2,421)51.94 (20,893)50.74 
Expired
(87,120)50.15 (236,062)50.17 
Outstanding at December 31, 2024366,274 $45.77 1,820,098 $45.21 
Deferred, restricted and performance share units (old plan and new plan) outstanding as at December 31, 2024 and 2023 are as follows:
Number of
deferred share
units
Number of
restricted share
units
Number of
performance share
units (new plan)
Outstanding at December 31, 2022155,761 340,929 744,887 
Granted
18,417 104,980 179,340 
Performance factor impact on redemption1
— — 143,065 
Granted in lieu of dividends
2,484 5,267 10,411 
Redeemed
(18,962)(131,398)(435,035)
Cancelled
— (8,924)(11,546)
Outstanding at December 31, 2023157,700 310,854 631,122 
Granted
28,159 134,080 234,430 
Performance factor impact on redemption1
— — 47,473 
Granted in lieu of dividends
2,827 5,468 10,113 
Redeemed
(33,892)(118,135)(297,331)
Cancelled
— (16,912)(24,305)
Outstanding at December 31, 2024154,794 315,355 601,502 
1     The number of performance share units that ultimately vest are determined by performance factors as described below. The performance factors impact relates to performance share units redeemed in the quarter ended March 31, 2024 and the quarter ended March 31, 2023.
Schedule of 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, 2024 is as follows:
Units outstanding at December 31, 2024Units exercisable at December 31, 2024
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 $38.79
2.5390,318$32.7390,318$32.73
$42.34 to $50.49
5.53161,89646.3234,36049.41
$54.65 to $78.59
0.40114,06055.33114,06055.33

3.19366,274$45.77238,738$45.93
TSARs
$29.27 to $38.79
2.59606,205$33.30606,205$33.30
$42.34 to $50.49
5.18666,48346.77221,56248.97
$54.65 to $78.59
0.66547,41056.50547,41056.50

2.961,820,098$45.211,375,177$45.06
Schedule of SARs and TSARs outstanding and exercisable by range of exercise prices
Information regarding the SARs and TSARs outstanding as at December 31, 2024 is as follows:
Units outstanding at December 31, 2024Units exercisable at December 31, 2024
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 $38.79
2.5390,318$32.7390,318$32.73
$42.34 to $50.49
5.53161,89646.3234,36049.41
$54.65 to $78.59
0.40114,06055.33114,06055.33

3.19366,274$45.77238,738$45.93
TSARs
$29.27 to $38.79
2.59606,205$33.30606,205$33.30
$42.34 to $50.49
5.18666,48346.77221,56248.97
$54.65 to $78.59
0.66547,41056.50547,41056.50

2.961,820,098$45.211,375,177$45.06
Schedule of weighted average assumptions of outstanding SARs and TSARs
The fair value of each outstanding SARs and TSARs grant was estimated on December 31, 2024 and 2023 using the Black-Scholes option pricing model with the following weighted average assumptions:
20242023
Risk-free interest rate
4.2%4.5%
Expected dividend yield
1.5%1.6%
Expected life of SARs and TSARs (years)
1.51.4
Expected volatility
35%38%
Expected forfeitures
0%0%
Weighted average fair value (USD per unit)
$12.16 $10.75