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Share-based payments (Tables)
9 Months Ended
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation Costs Related to Share-Based Payments

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Three months ended

 

Nine months ended

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September 30, 

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September 30, 

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​

    

2022

    

2021

    

2022

    

2021

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Selling, general and administrative:

 

​

  

 

​

  

 

​

  

 

​

  

​

Stock option compensation expense

​

$

3,249

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$

2,133

​

$

8,871

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$

5,903

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Equity-classified share units

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​

4,759

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​

2,283

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​

16,450

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​

9,840

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Liability-classified share units

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​

108

​

​

527

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​

427

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​

(862)

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Employee share purchase plan - employer contributions

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690

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684

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2,085

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2,064

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​

​

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8,806

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​

5,627

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27,833

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16,945

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Acquisition-related costs:

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​

​

 

​

​

 

​

​

​

​

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Share-based continuing employment costs

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1,863

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2,707

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6,075

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7,938

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​

​

 

1,863

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2,707

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6,075

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7,938

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​

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$

10,669

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$

8,334

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$

33,908

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$

24,883

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Summary of Stock Option Activity

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Stock options

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Premium-priced stock options

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WA

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WA

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Common

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WA

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remaining

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Aggregate

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Common

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WA

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remaining

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Aggregate

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shares under

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exercise

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contractual

​

intrinsic

​

shares under

​

exercise

​

contractual

​

intrinsic

​

option

  

price

  

life (in years)

  

value

  

option

  

price

  

life (in years)

  

value

Outstanding, December 31, 2021

2,208,057

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$

42.55

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​

7.7

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$

41,884

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1,017,064

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$

91.24

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​

5.7

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$

—

Granted

697,536

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​

58.14

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—

​

 

—

​

119,157

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​

91.37

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​

—

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​

—

Exercised

(155,694)

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​

37.02

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—

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​

4,359

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—

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​

—

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—

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—

Forfeited

(20,662)

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​

47.96

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—

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—

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(17,789)

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​

90.93

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—

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—

Outstanding, September 30, 2022

2,729,237

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$

46.81

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​

7.6

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$

43,405

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1,118,432

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$

91.26

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​

4.9

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$

—

Exercisable, September 30, 2022

1,280,995

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$

37.62

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​

6.3

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$

31,859

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—

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$

—

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—

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$

—

Summary of Share Unit Activity

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Equity-classified awards

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Liability-classified awards

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PSUs

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PSUs with Market Conditions

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RSUs

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DSUs

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WA grant

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WA grant

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WA grant

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WA grant

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date fair

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​

date fair

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date fair

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​

date fair

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Number

  

value

  

Number

  

value

  

Number

  

value

  

​

Number

  

value

Outstanding at December 31, 2021

 

523,618

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$

45.90

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88,305

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$

65.45

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79,112

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$

54.96

 

​

156,589

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$

35.28

Granted

 

230,122

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58.68

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14,574

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69.92

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34,135

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57.70

 

​

16,182

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59.57

Vested and settled

 

(93,241)

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36.42

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—

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—

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(27,850)

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44.02

 

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—

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—

Forfeited

 

(3,503)

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50.97

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—

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—

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(6,070)

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59.67

 

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—

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—

Outstanding at September 30, 2022

 

656,996

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$

51.70

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102,879

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$

66.08

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79,327

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$

59.62

 

​

172,771

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$

37.55

Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options

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Nine months ended September 30, 

    

2022

    

2021

    

Risk free interest rate

 

2.2

%  

0.5

%

Expected dividend yield

 

1.74

%  

1.66

%

Expected lives of the stock options

 

4

years

4

years

Expected volatility

 

31.8

%  

32.3

%

Premium Priced Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options

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Nine months ended September 30, 

    

2022

    

2021

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Risk free interest rate

 

3.0

%  

1.00

%  

Expected dividend yield

 

1.63

%  

1.66

%  

Expected lives of the stock options

​

4

years

5

years

Expected volatility

 

30.2

%  

30.6

%  

Performance Share Units With Market Conditions [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options

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Nine months ended September 30, 

    

2022

    

2021

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Risk free interest rate

 

2.7

%  

0.5

%  

Expected dividend yield

 

1.63

%  

1.63

%  

Expected lives of the PSUs

​

2

years

3

years

Expected volatility

 

33.4

%  

31.0

%  

Average expected volatility of comparable companies

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34.4

%  

38.6

%