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DEBT FACILITIES - Long-term Debt (Details)
Mar. 31, 2021
CAD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current $ 216,300,000   $ 206,200,000
Non-current 2,135,200,000   3,106,000,000.0
U.S. dollar, fixed rate - 3.60% to 4.90%      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 975,000,000.0  
Current 17,200,000   0
Non-current $ 1,202,300,000   1,370,400,000
U.S. dollar, fixed rate - 3.60% to 4.90% | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 3.60% 3.60%  
U.S. dollar, fixed rate - 3.60% to 4.90% | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.90% 4.90%  
Canadian dollar, fixed rate - 4.15%      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.15% 4.15%  
Notional amount $ 30,000,000.0    
Current 2,900,000   0
Non-current 27,100,000   30,000,000.0
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 176,400,000  
Current 71,200,000   79,700,000
Non-current 149,300,000   177,100,000
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount 40,900,000    
Current 5,600,000   5,600,000
Non-current 35,100,000   40,700,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 15,300,000   8,200,000
Non-current 54,700,000   7,900,000
U.S. dollar      
Disclosure of detailed information about borrowings [line items]      
Current 60,800,000   91,700,000
Non-current 110,700,000   214,400,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 27,000,000.0   21,000,000.0
Non-current 148,700,000   160,700,000
Canadian dollar      
Disclosure of detailed information about borrowings [line items]      
Current 16,300,000   0
Non-current 407,300,000   391,500,000
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0   0
Non-current 0   423,300,000
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0   0
Non-current $ 0   $ 290,000,000.0