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CAPITAL RISK MANAGEMENT (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Capital Risk Management [Abstract]      
Total long-term debt (Note 18) $ 3,250.1 $ 3,046.2  
Less: cash and cash equivalents (217.6) (346.1) $ (926.1)
Net debt 3,032.5 2,700.1  
Equity 4,588.9 4,086.6 $ 3,212.8
Total net debt plus equity $ 7,621.4 $ 6,786.7  
Net debt to capital (in percent) 39.80% 39.80%