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SHAREHOLDERS' EQUITY - Capital Stock (Details)
Dec. 31, 2018
vote
shares
Apr. 30, 2018
CAD ($)
shares
Preference shares [member]    
Disclosure of classes of share capital [line items]    
Number of shares authorised 400,000,000  
Class A Voting Shares    
Disclosure of classes of share capital [line items]    
Number of shares authorised 112,474,388  
Number of votes entitled to | vote 50  
Class B Non-Voting Shares    
Disclosure of classes of share capital [line items]    
Number of shares authorised 1,400,000,000  
Authorized amount | $   $ 500,000,000
Authorized amount (in shares)   35,800,000.0