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Share-Based Payments - Share Based Options by Exercise Price (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]      
Number of share options outstanding in share-based payment arrangement | shares 3,173 3,074 3,101
Weighted average exercise price (in CAD per share) $ 49.65 $ 42.36 $ 37.06
$18.00 to $24.00      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options outstanding in share-based payment arrangement | shares 48,000    
Weighted average remaining contractual life (years) 1 year 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 share options outstanding in share-based payment arrangement | shares 168,000    
Weighted average remaining contractual life (years) 2 years 1 month 24 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 share options outstanding in share-based payment arrangement | shares 23,000    
Weighted average remaining contractual life (years) 2 months 1 day    
Weighted average exercise price (in CAD per share) $ 31.65    
$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 share options outstanding in share-based payment arrangement | shares 589,000    
Weighted average remaining contractual life (years) 4 years 4 months 13 days    
Weighted average exercise price (in CAD per share) $ 39.53    
$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 $62.12      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options outstanding in share-based payment arrangement | shares 2,345,000    
Weighted average remaining contractual life (years) 7 years 11 months 15 days    
Weighted average exercise price (in CAD per share) $ 54.48    
$45.01 to $62.12 | 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 $62.12 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices (in CAD per share) $ 62.12    
Total Stock Options      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share options outstanding in share-based payment arrangement | shares 3,173,000    
Weighted average remaining contractual life (years) 6 years 9 months 29 days    
Weighted average exercise price (in CAD per share) $ 49.65