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DEBT FACILITIES - Non-recourse Debt (Details)
$ in Millions, $ in Millions
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]        
Debt $ 2,328.3   $ 1,260.9  
Term Loan, March 2028        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 39.9   $ 43.5
Line of credit facility, maximum borrowing capacity $ 12.0      
Term Loans Repaid During Fiscal 2019        
Disclosure of detailed information about borrowings [line items]        
Notional amount       $ 22.3
Term Loan, April 2018        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 0.7    
Borrowings, interest rate 13.50% 13.50%    
London Interbank Offered Rate (LIBOR) | Term Loan, March 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.50% 2.50%    
Non-recourse Debt        
Disclosure of detailed information about borrowings [line items]        
Debt $ 53.0   86.0  
Non-recourse Debt | Term Loan, March 2028        
Disclosure of detailed information about borrowings [line items]        
Debt 53.0   55.8  
Non-recourse Debt | Term Loans Repaid During Fiscal 2019        
Disclosure of detailed information about borrowings [line items]        
Debt 0.0   28.9  
Non-recourse Debt | Term Loan, April 2018        
Disclosure of detailed information about borrowings [line items]        
Debt $ 0.0   $ 1.3