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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($) $ in Millions | 12 Months Ended
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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

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