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SHARE-BASED COMPENSATION (Outstanding stock options) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
CAD
shares
Jan. 01, 2017
USD ($)
shares
Jan. 01, 2017
CAD
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number, outstanding, end of fiscal period (in shares) 3,022,000 3,022,000    
CAD        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number, outstanding, beginning of fiscal period (in shares) 2,532,000 2,532,000 1,895,000 1,895,000
Granted (in shares)     714,000 714,000
Exercised (in shares) (269,000) (269,000) (77,000) (77,000)
Number, outstanding, end of fiscal period (in shares) 2,263,000 2,263,000 2,532,000 2,532,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | CAD   CAD 31.18   CAD 29.78
Granted (in CAD per share) | CAD       33.01
Exercised (in CAD per share) | CAD   16.43   13.76
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | CAD   CAD 32.94   CAD 31.18
USD        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number, outstanding, beginning of fiscal period (in shares) 0 0    
Granted (in shares) 759,000 759,000    
Number, outstanding, end of fiscal period (in shares) 759,000 759,000 0 0
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | $ $ 0.00      
Granted (in CAD per share) | $ 29.01      
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $ $ 29.01   $ 0.00