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Shareholders' equity (Tables)
 9 Months Ended
Sep. 30, 2020
Statement [LineItems]  
Summary of Issued Capital
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.
Summary of Weighted Average Number of Shares Per Share
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