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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - MARKET RISK (Details)
1 Months Ended 12 Months Ended
Feb. 01, 2018
Dec. 31, 2017
CAD
Number_of_equity
Dec. 31, 2016
CAD
Fair Value Hedges      
Outstanding fair value hedges | CAD   CAD 0 CAD 0
Minimum      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Floating rate debt as a percentage of total debt outstanding   2.20%  
Maximum      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Floating rate debt as a percentage of total debt outstanding   25.00%  
Interest rate contracts - short-term borrowings      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Average swap rate (as a percent)   2.60%  
Interest rate contracts - long-term debt      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Average swap rate (as a percent)   3.10%  
Equity contracts      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Number of forms of stock-based compensation with equity price risk | Number_of_equity   1  
Subsequent Event | Maximum      
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS      
Floating rate debt as a percentage of total debt outstanding 30.00%