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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Mar. 31, 2021
Disclosure of analysis of other comprehensive income by item [abstract]  
Analysis of other comprehensive income
Foreign currency
exchange differences Net changes in
 
on translation of
 Net changes infinancial assets  
foreign operations
 cash flow hedges carried at FVOCITotal
20212020202120202021202020212020
Balances, beginning of year $225.9 $208.9 $(33.3)$(10.5)$0.6 $0.6 $193.2 $199.0 
Other comprehensive (loss) income(161.4)17.0 28.1 (22.8)(1.8)— (135.1)(5.8)
Balances, end of year$64.5 $225.9 $(5.2)$(33.3)$(1.2)$0.6 $58.1 $193.2