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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 12 Months Ended
Mar. 31, 2018
Disclosure of analysis of other comprehensive income by item [abstract]  
Analysis of other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Share in the other
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net changes in
 
 
comprehensive
 
 
 
 
 
 
 
Foreign currency
 
 
Net changes in
 
 
available-for-sale
 
 
income of equity
 
 
 
 
 
 
 
translation
 
 
cash flow hedges
 
 
financial instruments
 
 
accounted investees
 
 
 
 
Total


 
2018

 
2017

 
2018

 
2017

 
2018

 
2017

 
2018

 
2017

 
2018

 
2017

Balances, beginning of year
 
$
148.6

 
$
180.0

 
$
(4.3
)
 
$
(15.6
)
 
$
0.5

 
$
0.7

 
$
48.9

 
$
55.6

 
$
193.7

 
$
220.7

OCI
 
81.7

 
(31.4
)
 
(0.5
)
 
11.3

 
0.1

 
(0.2
)
 
(12.7
)
 
(6.7
)
 
68.6

 
(27.0
)
Balances, end of year
 
$
230.3

 
$
148.6

 
$
(4.8
)
 
$
(4.3
)
 
$
0.6

 
$
0.5

 
$
36.2

 
$
48.9

 
$
262.3

 
$
193.7