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CHANGES IN ACCOUNTING POLICIES - Narrative (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment $ 2,154.0 [1] $ 1,943.3 $ 2,149.3 $ 1,803.9
Difference between amount of new lease liabilities recognized and future aggregate minimum lease payments   274.1    
Assets under finance lease        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment $ 0.0     $ 121.2
Impact of adopting IFRS 16        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   226.8    
Lease liabilities   $ 265.8    
weighted average rate   5.40%    
Property, plant and equipment   $ (206.0)    
Impact of adopting IFRS 16 | Assets under finance lease        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment   $ 206.0    
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.