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DEBT FACILITIES - Long-term Debt (Details)
Mar. 31, 2022
CAD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current $ 241,800,000   $ 216,300,000
Non-current 2,804,400,000   2,135,200,000
U.S. dollar, fixed rate - 3.60% to 4.90%      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 960,500,000  
Current 17,400,000   17,200,000
Non-current $ 1,176,500,000   1,202,300,000
U.S. dollar, fixed rate - 3.60% to 4.90% | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 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]      
Interest rate (in percent) 4.90% 4.90%  
Canadian dollar, fixed rate - 4.15%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 4.15% 4.15%  
Notional amount $ 27,100,000    
Current 2,900,000   2,900,000
Non-current 24,200,000   27,100,000
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 412,400,000  
Current 69,700,000   71,200,000
Non-current 443,100,000   149,300,000
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount 35,200,000    
Current 5,600,000   5,600,000
Non-current 29,400,000   35,100,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 14,100,000   15,300,000
Non-current 58,400,000   54,700,000
U.S. dollar      
Disclosure of detailed information about borrowings [line items]      
Current 66,100,000   60,800,000
Non-current 164,600,000   110,700,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 32,900,000   27,000,000.0
Non-current 131,400,000   148,700,000
Canadian dollar      
Disclosure of detailed information about borrowings [line items]      
Current 33,100,000   16,300,000
Non-current 439,900,000   407,300,000
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0   0
Non-current $ 336,900,000   $ 0