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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax [Abstract]    
Earnings before income taxes $ 399.7 $ 385.6
Canadian statutory income tax rates 26.72% 26.85%
Income taxes at Canadian statutory rates $ 106.8 $ 103.5
Difference between Canadian and Foreign statutory rates (12.5) (14.0)
Unrecognized tax benefits 3.1 3.1
Tax benefit of operating losses not previously recognized (3.4) (8.4)
Non-taxable capital gain (1.5) (2.0)
Tax impact on equity accounted investees (8.0) (10.7)
Non-deductible items 2.7 4.6
Prior years' tax adjustments and assessments 8.5 4.4
Impact of change in income tax rates on deferred income taxes (1.3) (31.2)
Non-taxable research and development tax credits (1.1) (1.2)
Gain resulting from the remeasurement to fair value of the previously held interest in joint-venture (1.0) (6.9)
Other tax benefits not previously recognized (32.7) (10.3)
Income tax expense $ 59.6 $ 30.9