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BALANCE FROM CONTRACTS WITH CUSTOMERS - Net Contract Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Revenue [abstract]    
Contract assets - current $ 482.2 $ 537.6
Contract assets - non-current (Note 18) 38.8 41.6
Contract liabilities - current (1,001.6) (911.7)
Contract liabilities - non-current (Note 23) (126.8) (99.8)
Net contract liabilities $ (607.4) $ (432.3)