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OTHER GAINS - NET - Gains (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Analysis of income and expense [abstract]    
Disposal of property, plant and equipment $ 1.2 $ 9.7
Net foreign exchange gains 24.8 2.5
Reversal of royalty obligations 7.9 2.0
Disposal of interest in investment 0.0 14.3
Remeasurement of investment, net of reorganization and others costs 3.7 12.2
Other (15.3) (3.3)
Other gains – net $ 22.3 $ 37.4