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Shareholders' equity
 9 Months Ended
Sep. 30, 2020
Statement [LineItems]  
Shareholders' equity
11. Shareholders’ equity
i) Issued
 
Shareholders’ capital
  
Common Shares
   
Amount
 
Balance, December 31, 2018
   72,473,719   $2,185 
Issued on exercise of equity compensation plans
(1)
   537,769    2 
  
 
 
   
 
 
 
Balance, December 31, 2019
  
 
73,011,488
 
  
$
2,187
 
Issued on exercise of equity compensation plans
(1)
  
 
495,255
 
  
 
—  
 
  
 
 
   
 
 
 
Balance, September 30, 2020
  
 
73,506,743
 
  
$
2,187
 
  
 
 
   
 
 
 
 
(1)
Upon vesting or exercise of equity awards, the net benefit is recorded as a reduction of other reserves and an increase to shareholders’ capital.
ii) Earnings per share - Basic and Diluted
The weighted average number of shares used to calculate per share amounts was as follows:
 
   Three months ended
September 30		   Nine months ended
September 30		 
  
 
 
   
 
 
 
Average shares outstanding (millions)
  
2020
   2019   
2020
   2019 
Basic and Diluted
  
 
73.5
 
   73.0   
 
73.2
 
   72.8 
  
 
 
   
 
 
   
 
 
   
 
 
 
For the third quarter of 2020 and for the first nine months of 2020, 1.0 million common shares (2019 – 0.2 million) that are issuable under the Stock Option Plan (“Option Plan”) were excluded in calculating the weighted average number of diluted shares outstanding as they were considered anti-dilutive.