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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Summary of Normal Course Issuer Bids
The following is a summary of the Normal Course Issuer Bids [number of shares in the table below are expressed in whole numbers]:
 
                                                                                     
   
2020
   
2019
 
   
Shares

purchased
   
Cash

amount
   
Shares

purchased
   
Cash

amount
 
 
     
2018 Bid
  
 
0
 
  
$
0
 
  
 
23,401,457
 
  
$
1,159
 
2019 Bid
  
 
5,077,882
 
  
 
203
 
  
 
2,367,106
 
  
 
130
 
   
 
 
   
 
 
   
 
 
   
 
 
 
   
 
5,077,882
 
  
$
203
 
  
 
25,768,563
 
  
$
1,289
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Maximum Number of Shares Outstanding Exercised or Converted
[c]
The following table presents the maximum number of shares that would be outstanding if all the dilutive instruments outstanding at March 4, 2021 were exercised or converted:
Common Shares
   301,877,555 
Stock options
[i]
   6,968,787 
   
 
 
 
    308,846,342 
   
 
 
 
 
 [i]
Options to purchase Common Shares are exercisable by the holder in accordance with the vesting provisions and upon payment of the exercise price as may be determined from time to time pursuant to the Company’s stock option plans.