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Share-Based Payments - Share Based Options by Exercise Price (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]      
Number of stock options (thousands) | shares 3,074 3,101 3,008
Weighted average remaining contractual life (years) 6 years 3 months 7 days    
Weighted average exercise price (in CAD per share) $ 42.36 $ 37.06 $ 33.88
$18.00 to $24.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options (thousands) | shares 407    
Weighted average remaining contractual life (years) 2 years 1 month 28 days    
Weighted average exercise price (in CAD per share) $ 21.53    
$18.00 to $24.00 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) 18.00    
$18.00 to $24.00 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 24.00    
$24.01 to $30.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options (thousands) | shares 176    
Weighted average remaining contractual life (years) 3 years 1 month 28 days    
Weighted average exercise price (in CAD per share) $ 28.20    
$24.01 to $30.00 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) 24.01    
$24.01 to $30.00 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 30.00    
$30.01 to $35.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options (thousands) | shares 82    
Weighted average remaining contractual life (years) 8 months 19 days    
Weighted average exercise price (in CAD per share) $ 31.03    
$30.01 to $35.00 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) 30.01    
$30.01 to $35.00 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 35.00    
$35.01 to $45.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options (thousands) | shares 794    
Weighted average remaining contractual life (years) 5 years 3 months 15 days    
Weighted average exercise price (in CAD per share) $ 39.50    
$35.01 to $45.00 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) 35.01    
$35.01 to $45.00 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 45.00    
$45.01 to $53.96      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options (thousands) | shares 1,615    
Weighted average remaining contractual life (years) 8 years 4 months 24 days    
Weighted average exercise price (in CAD per share) $ 51.14    
$45.01 to $53.96 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) 45.01    
$45.01 to $53.96 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 53.96