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DEBT FACILITIES - Narrative (Details)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 09, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2020
CAD ($)
Mar. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2019
CAD ($)
Jul. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]                
Repayment of long-term debt       $ 233.0 [1] $ 72.7      
Unsecured Senior Notes, Maturing 2034                
Disclosure of detailed information about borrowings [line items]                
Debt           $ 100.0    
Borrowings, interest rate           4.90%    
Unsecured Senior Notes                
Disclosure of detailed information about borrowings [line items]                
Repayment of long-term debt   $ 95.0 $ 60.0          
R&D Obligations                
Disclosure of detailed information about borrowings [line items]                
Undrawn borrowing facilities       $ 86.3 $ 149.7      
Revolving Unsecured Term Credit Facility, September 2023                
Disclosure of detailed information about borrowings [line items]                
Line of credit facility, maximum borrowing capacity             $ 850.0 $ 550.0
Cash and Liquidity Mitigation Measures | Revolving Unsecured Credit Facilities                
Disclosure of detailed information about borrowings [line items]                
Debt $ 500.0              
Debt term 2 years              
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.