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Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [abstract]  
Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding
Shares (in 000’s)Class A
Common Shares		Class B Subordinate Voting
Shares
As at January 1, 2020
7,765 539,528 
Shares issued on options exercised (c)— 145 
Acquired and cancelled pursuant to normal course issuer bid (h)— (16,292)
As at December 31, 20207,765 523,381 
Shares issued on options exercised (c)— 3,067 
As at December 31, 20217,765 526,448 
Summary of Weighted Average Assumptions
The weighted average fair value of share options granted in the year was estimated at $10.83 per option (2020 – $4.76) at the grant date based on the Black-Scholes option-pricing model using the following assumptions:

20212020
Weighted average exercise price$ 29.04$ 14.42
Dividend yield0.69 %2.13 %
Risk-free interest rate0.75 %1.19 %
Expected option life6.3 years6.1 years
Expected volatility40 %41 %
Forfeiture rate0.78 %1.16 %
Summary of Outstanding Share Options
Outstanding share options are as follows:

 20212020
Share
Options
(in 000’s)		Weighted
Average
Exercise Price		Share
Options
(in 000’s)		Weighted
Average
Exercise Price
Outstanding at beginning of year25,250 $20.61 20,152 $23.02 
Granted2,519 29.046,314 14.42
Exercised(3,189)16.03(156)8.33
Forfeited(186)25.43(293)20.97
Expired(714)52.86(767)35.14
Outstanding at end of year23,680 $21.12 25,250 $20.61 
Vested and exercisable at end of year16,543 $21.29 17,368 $21.76 
Summary of Information Relating to Share Options Outstanding
Information relating to share options outstanding at December 31, 2021, is as follows:

Outstanding Share Options (in 000’s)Exercise
Price Range		Weighted Average Remaining Life
of Outstanding Options (months)
4,096
$5.34 — $13.57
49
4,876
$13.58 — $14.71
98
5,406
 $14.72 — $26.53
43
5,700
 $26.54 — $29.43
88
3,602
 $29.44 — $39.90
36
23,680
$5.34 — $39.90
65
Summary of Exercise Price Range for Share Options
Information relating to share options outstanding at December 31, 2021, is as follows:

Outstanding Share Options (in 000’s)Exercise
Price Range		Weighted Average Remaining Life
of Outstanding Options (months)
4,096
$5.34 — $13.57
49
4,876
$13.58 — $14.71
98
5,406
 $14.72 — $26.53
43
5,700
 $26.54 — $29.43
88
3,602
 $29.44 — $39.90
36
23,680
$5.34 — $39.90
65
Summary of Outstanding Units
The outstanding Units are summarized in the following table:

(in 000’s)20212020
 OutstandingVestedOutstandingVested
DSUs2,526 2,526 2,555 2,555 
RSUs2,707 — 1,408 — 
PSUs1,622 — 1,449 — 
PDSUs185 67 213 70 
7,040 2,593 5,625 2,625 
Summary of Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income
(CAD$ in millions)20212020
Accumulated other comprehensive income – beginning of year$247 $309 
Currency translation differences:
Unrealized losses on translation of foreign subsidiaries(50)(197)
       Foreign exchange differences on debt designated as a hedge of our
          investment in foreign subsidiaries (net of taxes of $(2) and $(17)) (Note 29(b))
11 111 
(39)(86)
Gain (loss) on marketable equity and debt securities (net of taxes of $1 and $(3))
(6)24 
Remeasurements of retirement benefit plans (net of taxes of $(91) and $29)
171 (50)
Total other comprehensive income (loss)126 (112)
Less remeasurements of retirement benefit plans recorded in retained earnings(171)50 
Accumulated other comprehensive income – end of year$202 $247 
Summary of Basic and Diluted Earnings Per Share
The following table reconciles our basic and diluted earnings (loss) per share:

(CAD$ in millions, except per share data)20212020
Net basic and diluted profit (loss) attributable to shareholders of the company$2,868 $(864)
Weighted average shares outstanding (000’s)532,340 534,378
Dilutive effect of share options7,931 — 
Weighted average diluted shares outstanding (000’s)540,271 534,378
Basic earnings (loss) per share$5.39 $(1.62)
Diluted earnings (loss) per share$5.31 $(1.62)