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FINANCIAL RISK MANAGEMENT - Letters Of Credit And Guarantees (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Disclosure of notes and other explanatory information [Abstract]    
Advance payments $ 42.0 $ 41.0
Contract performance 83.9 46.4
Lease obligations 19.5 30.1
Financial obligations 69.2 70.3
Other 1.5 8.4
Letters of credit and guarantees, net $ 216.1 $ 196.2