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DEBT FACILITIES - Recourse Debt (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2019
CAD ($)
Mar. 31, 2018
CAD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 27, 2019
USD ($)
Mar. 26, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                
Debt $ 2,328,300,000 $ 1,260,900,000            
Unsecured Senior Notes, Between December 2019 and December 2027                
Disclosure of detailed information about borrowings [line items]                
Notional amount $ 125,000,000 125,000,000   $ 225.0       $ 225.0
Debt instrument, basis spread on floating interest rate       0.0        
Unsecured Senior Notes, Between August 2026 and March 2033                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 200.0        
Borrowings, interest rate 4.44%     4.44%        
Unsecured Senior Notes, August 2021 and August 2026                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 150.0        
R&D Obligation, Government Agency, July 2029                
Disclosure of detailed information about borrowings [line items]                
Line of credit facility, maximum borrowing capacity $ 250,000,000              
R&D Obligation, Government Agency, July 2035                
Disclosure of detailed information about borrowings [line items]                
Line of credit facility, maximum borrowing capacity $ 250,000,000              
R&D, project term 5 years 6 months              
R&D obligation, recognized $ 250,000,000 226,500,000            
R&D Obligation, Government Agency, April 2039                
Disclosure of detailed information about borrowings [line items]                
Debt 14,600,000 0            
Line of credit facility, maximum borrowing capacity $ 150,000,000              
R&D, project term 5 years              
R&D obligation, recognized $ 36,900,000 0            
R&D Obligation, Government Agency, September 2028                
Disclosure of detailed information about borrowings [line items]                
Debt 6,000,000 0            
Line of credit facility, maximum borrowing capacity $ 47,500,000              
R&D, project term 5 years              
R&D obligation, recognized $ 10,900,000 0            
Term Loan, Between March 2021 and March 2024                
Disclosure of detailed information about borrowings [line items]                
Notional amount       150.0       0.0
Bottom of range | Unsecured Senior Notes, Between March 2029 and March 2034                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 450.0        
Borrowings, interest rate 4.47%     4.47%        
Bottom of range | Unsecured Senior Notes, Between December 2019 and December 2027                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate 3.59%     3.59%        
Notional Amount, remaining $ 0              
Bottom of range | Unsecured Senior Notes, June 2019                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 60.0        
Bottom of range | Obligations Under Finance Lease, September 2019 to October 2036                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate 3.54%     3.54%        
Top of range | Unsecured Senior Notes, Between March 2029 and March 2034                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 0.0        
Borrowings, interest rate 4.72%     4.72%        
Top of range | Unsecured Senior Notes, Between December 2019 and December 2027                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate 4.15%     4.15%        
Notional Amount, remaining       $ 0.0        
Top of range | Unsecured Senior Notes, June 2019                
Disclosure of detailed information about borrowings [line items]                
Notional amount       $ 60.0        
Borrowings, interest rate 7.66%     7.66%        
Top of range | Obligations Under Finance Lease, September 2019 to October 2036                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate 10.68%     10.68%        
Recourse Debt                
Disclosure of detailed information about borrowings [line items]                
Debt $ 2,275,300,000 1,174,900,000            
Recourse Debt | Unsecured Senior Notes, Between March 2029 and March 2034                
Disclosure of detailed information about borrowings [line items]                
Debt       $ 598.2       0.0
Notional amount     $ 100.0 450.0     $ 550.0  
Recourse Debt | Unsecured Senior Notes, Between December 2019 and December 2027                
Disclosure of detailed information about borrowings [line items]                
Debt 424,600,000 415,000,000            
Recourse Debt | Unsecured Senior Notes, Between August 2026 and March 2033                
Disclosure of detailed information about borrowings [line items]                
Debt       265.3       193.4
Notional amount         $ 150.0 $ 100.0    
Recourse Debt | Unsecured Senior Notes, June 2019                
Disclosure of detailed information about borrowings [line items]                
Debt       80.1       75.7
Recourse Debt | Obligations Under Finance Lease, September 2019 to October 2036                
Disclosure of detailed information about borrowings [line items]                
Debt 259,300,000 145,400,000            
Recourse Debt | R&D Obligation, Government Agency, July 2029                
Disclosure of detailed information about borrowings [line items]                
Debt 174,200,000 167,700,000            
Recourse Debt | R&D Obligation, Government Agency, July 2035                
Disclosure of detailed information about borrowings [line items]                
Debt 153,700,000 132,600,000            
Recourse Debt | R&D Obligation, Government Agency, April 2039                
Disclosure of detailed information about borrowings [line items]                
Debt   0            
Recourse Debt | R&D Obligation, Government Agency, September 2028                
Disclosure of detailed information about borrowings [line items]                
Debt   0            
Recourse Debt | Term Loan, Between March 2021 and March 2024                
Disclosure of detailed information about borrowings [line items]                
Debt       $ 199.0       $ 0.0
Recourse Debt | Term Loan, April 2028                
Disclosure of detailed information about borrowings [line items]                
Debt 51,900,000 0            
Recourse Debt | Other Debts                
Disclosure of detailed information about borrowings [line items]                
Debt $ 48,400,000 $ 45,100,000