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Share-Based Payment Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based payment arrangements [Abstract]  
Disclosure of range of exercise prices of outstanding share options
The total options outstanding and exercisable under these stock option plans at Dec. 31, 2020, are outlined below:
 Options outstanding
Range of exercise prices(1)
($ per share)
Number of options (millions)
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
 ($ per share)
5.00 - 10.00
4.0 4.2 6.85 
 (1) Options currently exercisable as at Dec. 31, 2020
Disclosure of number and weighted average remaining contractual life of outstanding share options
The total options outstanding and exercisable under these stock option plans at Dec. 31, 2020, are outlined below:
 Options outstanding
Range of exercise prices(1)
($ per share)
Number of options (millions)
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
 ($ per share)
5.00 - 10.00
4.0 4.2 6.85 
 (1) Options currently exercisable as at Dec. 31, 2020.