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DEBT FACILITIES - Long-term Debt (Details)
$ in Millions, $ in Millions
Mar. 31, 2024
CAD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current $ 308.9   $ 214.6
Non-current 2,765.4   3,035.5
U.S. dollar, fixed rate - 3.60% to 4.90%      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 933.0  
Current 190.5   18.5
Non-current $ 1,068.8   $ 1,257.9
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, Series 1, fixed rate - 5.541%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 5.541% 5.541% 5.541%
Notional amount $ 400.0   $ 400.0
Current 0.0   0.0
Non-current $ 397.5   0.0
Canadian dollar, fixed rate - 4.15%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 4.15% 4.15%  
Notional amount $ 21.5    
Current 12.9   2.9
Non-current 8.6   21.4
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 125.0  
Current 0.0   67.0
Non-current 168.9   405.4
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount 23.9    
Current 5.6   5.6
Non-current 18.3   23.8
Other      
Disclosure of detailed information about borrowings [line items]      
Current 14.3   15.2
Non-current 32.8   47.4
U.S. dollar      
Disclosure of detailed information about borrowings [line items]      
Current 30.2   55.7
Non-current 368.2   241.3
Other      
Disclosure of detailed information about borrowings [line items]      
Current 25.0   25.5
Non-current 128.5   133.4
Canadian dollar      
Disclosure of detailed information about borrowings [line items]      
Current 30.4   24.2
Non-current 543.8   471.9
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0.0   0.0
Non-current 0.0   433.0
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0.0   0.0
Non-current $ 30.0   $ 0.0