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FINANCIAL RISK MANAGEMENT - Letters Of Credit And Guarantees (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of notes and other explanatory information [Abstract]    
Advance payment $ 36.0 $ 44.7
Contract performance 44.0 42.3
Lease obligations 37.1 39.9
Financial obligations 63.0 76.9
Other 9.5 1.2
Letters of credit and guarantees, net $ 189.6 $ 205.0