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CAPITAL RISK MANAGEMENT (Details) - CAD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Capital Risk Management [Abstract]      
Total long-term debt (Note 19) $ 3,074.3 $ 3,250.1  
Less: cash and cash equivalents (160.1) (217.6) $ (346.1)
Net debt 2,914.2 3,032.5  
Equity 4,302.6 4,588.9 $ 4,086.6
Total net debt plus equity $ 7,216.8 $ 7,621.4  
Net debt to capital (in percent) 40.40% 39.80%