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DEBT FACILITIES - Long-term Debt (Details)
$ in Millions, $ in Millions
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current $ 399.0   $ 308.9
Non-current 3,071.4   2,765.4
U.S. dollar, fixed rate - 3.60% to 4.90%      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 792.0  
Current 20.0   190.5
Non-current $ 1,114.7   1,068.8
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 - 5.54%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 5.54% 5.54%  
Notional amount $ 400.0    
Current 0.0   0.0
Non-current $ 398.1   397.5
Canadian dollar, fixed rate - 4.15%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 4.15% 4.15%  
Notional amount $ 8.6    
Current 2.9   12.9
Non-current 5.7   8.6
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 325.0  
Current 178.7   0.0
Non-current 288.3   168.9
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount 18.3    
Current 5.6   5.6
Non-current 12.6   18.3
Other      
Disclosure of detailed information about borrowings [line items]      
Current 33.5   14.3
Non-current 0.0   32.8
U.S. dollar      
Disclosure of detailed information about borrowings [line items]      
Current 92.0   30.2
Non-current 432.0   368.2
Other      
Disclosure of detailed information about borrowings [line items]      
Current 29.1   25.0
Non-current 239.0   128.5
Canadian dollar      
Disclosure of detailed information about borrowings [line items]      
Current 37.2   30.4
Non-current 581.0   543.8
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0.0   0.0
Non-current 0.0   0.0
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0.0   0.0
Non-current $ 0.0   $ 30.0