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INCOME TAXES - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Canadian statutory income tax rates 26.72% 26.85%
Tax cuts and jobs act, change in tax rate $ 33.1  
Current period 69.9 $ 53.8
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 2,294.4 2,099.1
Deductible temporary differences for which no deferred tax asset is recognised $ 125.4 243.5
Deductible temporary differences for which no deferred tax asset is recognised, period 30 years  
Accumulated capital losses for which no deferred tax asset is recognised $ 0.8 0.9
Accumulated other comprehensive income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax expense (income) (1.1) 11.6
Current period $ 0.0 $ 0.6