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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Plan
The following table summarizes the Company’s stock option plan as at December 31, 2019:
 
Options outstanding
Non-vested options
 
Number of
options

Weighted-average
exercise price

Number of
options

Weighted-average
grant date
fair value

Outstanding, January 1, 2019
1,533,598

$
176.02

714,102

$
48.94

Granted
224,730

$
269.99

224,730

$
63.69

Exercised
(334,127
)
$
125.12

N/A

N/A

Vested
N/A

N/A

(169,193
)
$
47.59

Forfeited
(7,855
)
$
234.59

(7,855
)
$
54.75

Outstanding, December 31, 2019
1,416,346

$
199.12

761,784

$
53.54

Vested or expected to vest at December 31, 2019(1)
1,385,626

$
197.89

N/A

N/A

Exercisable, December 31, 2019
654,562

$
162.59

N/A

N/A

(1) As at December 31, 2019, the weighted-average remaining term of vested or expected to vest options was 4.9 years with an aggregate intrinsic value of $184 million.
Stock Options Outstanding and Exercisable
The following table provides the number of stock options outstanding and exercisable as at December 31, 2019 by range of exercise price and their related intrinsic aggregate value, and for options outstanding, the weighted-average years to expiration. The table also provides the aggregate intrinsic value for in-the-money stock options, which represents the amount that would have been received by option holders had they exercised their options on December 31, 2019 at the Company’s closing stock price of $331.03.
 
Options outstanding
Options exercisable
Range of exercise prices
Number of
options

Weighted-average
years to
expiration
Weighted-average
exercise
price

Aggregate
intrinsic
value
(millions)

Number of
options

Weighted-average
exercise
price

Aggregate
intrinsic
value
(millions)

$51.17 – $167.50
354,357

4.1
$
123.00

$
74

303,455

$
116.84

$
65

$167.51 – $197.05
355,040

4.1
$
188.53

$
51

135,532

$
175.30

$
21

$197.06– $247.87
376,654

4.8
$
222.75

$
41

215,465

$
218.98

$
24

$247.88 – $313.16
330,295

5.9
$
265.23

$
22

110

$
260.52

$

Total(1)
1,416,346

4.7
$
199.12

$
187

654,562

$
162.59

$
110

(1) As at December 31, 2019, the total number of in-the-money stock options outstanding was 1,416,346 with a weighted-average exercise price of $199.12. The weighted-average years to expiration of exercisable stock options is 4.2 years.
Weighted-Average Fair Value Assumptions The weighted-average fair value assumptions were approximately:
 
2019

2018

2017

Expected option life (years)(1)
5.00

5.00

5.48

Risk-free interest rate(2)
2.22
%
2.22
%
1.85
%
Expected stock price volatility(3)
25.04
%
24.81
%
26.94
%
Expected annual dividends per share(4) 
$
2.6191

$
2.3854

$
2.0010

Expected forfeiture rate(5)
6.05
%
4.70
%
2.80
%
Weighted-average grant date fair value of options granted during the year
$
63.69

$
55.63

$
45.78

(1) Represents the period of time that awards are expected to be outstanding. Historical data on exercise behaviour or, when available, specific expectations regarding future exercise behaviour were used to estimate the expected life of the option.
(2) Based on the implied yield available on zero-coupon government issues with an equivalent term commensurate with the expected term of the option.
(3) Based on the historical volatility of the Company’s stock price over a period commensurate with the expected term of the option.
(4) Determined by the current annual dividend at the time of grant. The Company does not employ different dividend yields throughout the contractual term of the option. On May 6, 2019, the Company announced an increase in its quarterly dividend to $0.8300 per share, representing $3.3200 on an annual basis.
(5) The Company estimates forfeitures based on past experience. The rate is monitored on a periodic basis.
Schedule of Options Exercised
The following table provides information related to all options exercised in the stock option plan during the years ended December 31:
(in millions of Canadian dollars)
2019

2018

2017

Total intrinsic value
$
63

$
17

$
36

Cash received by the Company upon exercise of options
26

24

45


Summary of Performance Share Unit Plan
The following table summarizes information related to the Company’s PSUs as at December 31:
 
2019

2018

Outstanding, January 1
395,048

334,028

Granted
134,260

162,255

Units, in lieu of dividends
4,032

3,643

Settled
(117,228
)
(66,243
)
Forfeited
(12,976
)
(38,635
)
Outstanding, December 31
403,136

395,048


Summary of Deferred Share Unit Plan
The following table summarizes information related to the DSUs as at December 31:
 
2019

2018

Outstanding, January 1
152,760

156,547

Granted
19,912

16,481

Units, in lieu of dividends
1,608

1,551

Settled
(12,110
)
(20,072
)
Forfeited
(951
)
(1,747
)
Outstanding, December 31
161,219

152,760


Summary of Share-Based Liabilities Paid
The following table summarizes the total share-based liabilities paid for each of the years ended December 31:
(in millions of Canadian dollars)
2019

2018

2017

Plan
 
 
 
PSUs
$
54

$
30

$
31

DSUs
4

6

6

Other

1

2

Total
$
58

$
37

$
39