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Share Capital - Range of Exercise Prices of Stock Options (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 47,646 46,685 56,036
Weighted average remaining term (years) 3 years 14 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 38.04 $ 37.92 $ 36.67
Stock options exercisable (in shares) | shares 17,057 19,436  
Weighted average exercise price, options exercisable (in CAD per share) $ 38.74 $ 36.03  
$22.90 - $24.99      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding (in shares) | shares 2,361    
Weighted average remaining term (years) 1 year 10 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 22.90    
Stock options exercisable (in shares) | shares 1,579    
Weighted average exercise price, options exercisable (in CAD per share) $ 22.90    
$22.90 - $24.99 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 22.90    
$22.90 - $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 3,524    
Weighted average remaining term (years) 1 year 14 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 28.85    
Stock options exercisable (in shares) | shares 2,236    
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 5,174    
Weighted average remaining term (years) 4 years 11 months 19 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 32.38    
Stock options exercisable (in shares) | shares 536    
Weighted average exercise price, options exercisable (in CAD per share) $ 32.58    
$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 16,635    
Weighted average remaining term (years) 3 years 10 months 27 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 36.85    
Stock options exercisable (in shares) | shares 2,263    
Weighted average exercise price, options exercisable (in CAD per share) $ 37.62    
$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 16,117    
Weighted average remaining term (years) 2 years 2 months 26 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 43.60    
Stock options exercisable (in shares) | shares 8,939    
Weighted average exercise price, options exercisable (in CAD per share) $ 43.58    
$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 3,835    
Weighted average remaining term (years) 3 years 21 days    
Weighted average exercise price, options outstanding (in CAD per share) $ 45.20    
Stock options exercisable (in shares) | shares 1,504    
Weighted average exercise price, options exercisable (in CAD per share) $ 45.13    
$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