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Share Capital - Range of Exercise Prices of Stock Options (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 48,656 47,646 46,685
Weighted  average  remaining  term (years) 2 years 10 months 24 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 37.53 $ 38.04 $ 37.92
Stock options exercisable (in shares) | shares 17,970 17,057  
Weighted average exercise price, options exercisable (in CAD per share) $ 39.59 $ 38.74  
$20.76 - $24.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 3,829    
Weighted  average  remaining  term (years) 3 years 10 months 9 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 21.12    
Stock options exercisable (in shares) | shares 944    
Weighted average exercise price, options exercisable (in CAD per share) $ 21.64    
$20.76 - $24.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 20.76    
$20.76 - $24.99 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 24.99    
$25.00 - $29.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 1,975    
Weighted  average  remaining  term (years) 1 year 9 months 21 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 28.48    
Stock options exercisable (in shares) | shares 1,362    
Weighted average exercise price, options exercisable (in CAD per share) $ 28.85    
$25.00 - $29.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 25.00    
$25.00 - $29.99 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 29.99    
$30.00 - $34.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 4,177    
Weighted  average  remaining  term (years) 4 years 2 months 23 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 32.37    
Stock options exercisable (in shares) | shares 378    
Weighted average exercise price, options exercisable (in CAD per share) $ 32.40    
$30.00 - $34.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 30.00    
$30.00 - $34.99 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 34.99    
$35.00 - $39.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 22,495    
Weighted  average  remaining  term (years) 3 years 5 months 8 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 37.49    
Stock options exercisable (in shares) | shares 4,721    
Weighted average exercise price, options exercisable (in CAD per share) $ 37.42    
$35.00 - $39.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 35.00    
$35.00 - $39.99 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 39.99    
$40.00 - $44.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 12,935    
Weighted  average  remaining  term (years) 1 year 6 months 10 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 43.57    
Stock options exercisable (in shares) | shares 8,884    
Weighted average exercise price, options exercisable (in CAD per share) $ 43.54    
$40.00 - $44.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 40.00    
$40.00 - $44.99 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 44.99    
$45.00 - $46.74      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 3,245    
Weighted  average  remaining  term (years) 2 years 4 months 24 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 45.21    
Stock options exercisable (in shares) | shares 1,681    
Weighted average exercise price, options exercisable (in CAD per share) $ 45.18    
$45.00 - $46.74 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 45.00    
$45.00 - $46.74 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 46.74