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CAPITAL RISK MANAGEMENT (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Capital Risk Management [Abstract]      
Total long-term debt (Note 21) $ 3,470.4 $ 3,074.3  
Less: cash and cash equivalents (293.7) (160.1) $ (217.6)
Net debt 3,176.7 2,914.2  
Equity 4,976.0 4,302.6 $ 4,588.9
Total net debt plus equity $ 8,152.7 $ 7,216.8  
Net debt to capital (in percent) 39.00% 40.40%