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STOCK-BASED COMPENSATION - Stock Option Range of Exercise Prices (Details)
Dec. 31, 2018
CAD ($)
shares
year
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 2,719,612 2,637,890 3,732,524
Options outstanding, Weighted average remaining contractual life (years) | year 6.43    
Options outstanding, Weighted average exercise price $ 53.22 $ 49.42 $ 43.70
Options exercisable, Number exercisable (in share) | shares 1,059,590 924,562  
Options exercisable, Weighted average exercise price $ 46.26 $ 42.32  
$37.96 - $39.99      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 360,248    
Options outstanding, Weighted average remaining contractual life (years) | year 0.16    
Options outstanding, Weighted average exercise price $ 37.96    
Options exercisable, Number exercisable (in share) | shares 360,248    
Options exercisable, Weighted average exercise price $ 37.96    
$37.96 - $39.99 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 37.96    
$37.96 - $39.99 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 39.99    
$40.00 - $44.99      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 245,052    
Options outstanding, Weighted average remaining contractual life (years) | year 5.02    
Options outstanding, Weighted average exercise price $ 44.31    
Options exercisable, Number exercisable (in share) | shares 152,901    
Options exercisable, Weighted average exercise price $ 43.97    
$40.00 - $44.99 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 40.00    
$40.00 - $44.99 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 44.99    
$45.00 - $49.99      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 575,064    
Options outstanding, Weighted average remaining contractual life (years) | year 5.36    
Options outstanding, Weighted average exercise price $ 48.93    
Options exercisable, Number exercisable (in share) | shares 382,303    
Options exercisable, Weighted average exercise price $ 48.56    
$45.00 - $49.99 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 45.00    
$45.00 - $49.99 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 49.99    
$50.00 - $59.99      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 1,011,698    
Options outstanding, Weighted average remaining contractual life (years) | year 8.53    
Options outstanding, Weighted average exercise price $ 58.04    
Options exercisable, Number exercisable (in share) | shares 41,680    
Options exercisable, Weighted average exercise price $ 56.70    
$50.00 - $59.99 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 50.00    
$50.00 - $59.99 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 59.99    
$60.00 - $64.99      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 489,835    
Options outstanding, Weighted average remaining contractual life (years) | year 8.44    
Options outstanding, Weighted average exercise price $ 62.82    
Options exercisable, Number exercisable (in share) | shares 122,458    
Options exercisable, Weighted average exercise price $ 62.82    
$60.00 - $64.99 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 60.00    
$60.00 - $64.99 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 64.99    
$65.00 - $68.10      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Options outstanding, Number outstanding (in shares) | shares 37,715    
Options outstanding, Weighted average remaining contractual life (years) | year 9.68    
Options outstanding, Weighted average exercise price $ 68.10    
Options exercisable, Number exercisable (in share) | shares 0    
Options exercisable, Weighted average exercise price $ 0.00    
$65.00 - $68.10 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices 65.00    
$65.00 - $68.10 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Range of exercise prices $ 68.10