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CAPITAL RISK MANAGEMENT (Details)
$ in Millions
Mar. 31, 2022
CAD ($)
Mar. 31, 2021
CAD ($)
Mar. 31, 2020
CAD ($)
Capital Risk Management [Abstract]      
Total long-term debt (Note 19) $ 3,046.2 $ 2,351.5  
Less: cash and cash equivalents (346.1) (926.1) $ (946.5)
Net debt 2,700.1 1,425.4  
Equity 4,086.6 3,212.8 $ 2,578.3
Total net debt plus equity $ 6,786.7 $ 4,638.2  
Net debt:equity (in percent) 0.67 0.45