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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-Based Payment Arrangements [Abstract]  
Changes in number and exercise prices of other equity instruments SARs and TSARs units outstanding at December 31, 2020 and 2019 are as follows:
SARs
TSARs
Number of
units
Exercise
price USD
Number of
units
Exercise
price USD
Outstanding at December 31, 2018896,883 $      51.27 1,447,301 $ 51.24 
Granted
29,320 57.60294,680 56.70
Exercised
(39,662)37.25(45,769)37.08
Cancelled
(29,134)54.72(34,885)53.38
Outstanding at December 31, 2019857,407 $          52.02 1,661,327 $52.55 
Granted
96,160 29.27761,050 29.27
Exercised
(20,635)34.59(1,900)34.59
Cancelled
(31,660)58.13(5,967)58.38
Expired
(60,500)38.24 (74,020)38.24 
Outstanding at December 31, 2020840,772 $50.61 2,340,490 $45.43 
Deferred, restricted and performance share units (old plan and new plan) outstanding as at December 31, 2020 and 2019 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, 2018209,092 17,361 579,778 — 
Granted
14,158 79,240 — 134,930 
Performance factor impact on redemption1
— — 132,215 — 
Granted in lieu of dividends
4,031 2,840 9,909 4,464 
Redeemed
(137,515)(15,428)(396,635)— 
Cancelled
— (845)(21,822)(1,356)
Outstanding at December 31, 201989,766 83,168 303,445 138,038 
Granted
29,393 154,460 — 301,090 
Performance factor impact on redemption1
— — (117,674)— 
Granted in lieu of dividends
3,788 7,326 4,529 13,597 
Redeemed
— (7,713)(39,612)(1,842)
Cancelled
— (8,369)(3,887)(7,713)
Outstanding at December 31, 2020122,947 228,872 146,801 443,170 
1     Performance share units granted prior to 2019 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, 2019, and the quarter ended March 31, 2020.
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, 2020 is as follows:
Units outstanding at December 31, 2020Units exercisable at December 31, 2020
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
3.62260,071$32.62163,911$34.59
$45.40 to $50.17
3.11125,78450.15125,78450.15
$54.65 to $78.59
1.86454,91761.01397,51661.77

2.59840,772$50.61687,211$53.16
TSARs
$29.27 to $35.51
5.021,067,987$30.80306,937$34.59
$45.40 to $50.17
3.33311,18449.84296,63750.05
$54.65 to $78.59
3.06961,31960.27674,90761.74

3.992,340,490$45.431,278,481$52.51
SARs and TSARs outstanding and exercisable by range of exercise prices Information regarding the SARs and TSARs outstanding as at December 31, 2020 is as follows:
Units outstanding at December 31, 2020Units exercisable at December 31, 2020
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
3.62260,071$32.62163,911$34.59
$45.40 to $50.17
3.11125,78450.15125,78450.15
$54.65 to $78.59
1.86454,91761.01397,51661.77

2.59840,772$50.61687,211$53.16
TSARs
$29.27 to $35.51
5.021,067,987$30.80306,937$34.59
$45.40 to $50.17
3.33311,18449.84296,63750.05
$54.65 to $78.59
3.06961,31960.27674,90761.74

3.992,340,490$45.431,278,481$52.51
Weighted average assumptions of outstanding SARs and TSARs The fair value of each outstanding SARs and TSARs grant was estimated on December 31, 2020 and 2019 using the Black-Scholes option pricing model with the following weighted average assumptions:
20202019
Risk-free interest rate
0.1%1.6%
Expected dividend yield
0.3%3.7%
Expected life of SARs and TSARs (years)
1.61.2
Expected volatility
60%38%
Expected forfeitures
0.0%0.1%
Weighted average fair value (USD per share)
$13.36 $3.03 
Changes in stock options issued
Common shares reserved for outstanding incentive stock options as at December 31, 2020 and 2019 are as follows:
Number of
stock
options
Weighted
average
exercise price
Outstanding at December 31, 2018198,221 $48.55 
Granted
7,410 57.60 
Exercised
(2,700)31.73 
Cancelled
(2,300)52.31 
Outstanding at December 31, 2019200,631 $49.07
Granted
15,440 $29.27 
Exercised
(5,900)34.59 
Cancelled
(5,600)58.96 
Expired
(31,320)38.24 
Outstanding at December 31, 2020173,251 $49.44
Stock options outstanding and exercisable by range of exercise prices
Information regarding the stock options outstanding as at December 31, 2020 is as follows:
Options outstanding at December 31, 2020Options exercisable at December 31, 2020
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
3.1463,307 $33.2947,867 $34.59
$45.40 to $50.17
3.1724,034 50.1724,034 50.17
$54.65 to $78.59
1.8985,910 61.1374,402 61.94
2.53173,251 $49.44146,303 $51.06
Number and weighted average remaining contractual life of stock options outstanding and exercisable
Information regarding the stock options outstanding as at December 31, 2020 is as follows:
Options outstanding at December 31, 2020Options exercisable at December 31, 2020
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
3.1463,307 $33.2947,867 $34.59
$45.40 to $50.17
3.1724,034 50.1724,034 50.17
$54.65 to $78.59
1.8985,910 61.1374,402 61.94
2.53173,251 $49.44146,303 $51.06