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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Mar. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of accounts receivable
Details of accounts receivable are as follows:
 
 
2018

 
2017

Current trade receivables
 
$
187.9

 
$
207.5

Past due trade receivables
 
 
 
 

1-30 days
 
52.1

 
56.8

31-60 days
 
40.9

 
14.5

61-90 days
 
15.6

 
13.0

Greater than 90 days
 
69.9

 
56.4

Allowance for doubtful accounts
 
(20.9
)
 
(14.5
)
Total trade receivables
 
$
345.5

 
$
333.7

Accrued receivables
 
116.1

 
105.8

Receivables from related parties (Note 32)
 
39.5

 
54.0

Other receivables
 
67.3

 
54.9

Total accounts receivable
 
$
568.4

 
$
548.4
Schedule of changes in allowance for doubtful accounts
Changes in the allowance for doubtful accounts are as follows:
 
 
2018

 
2017

Allowance for doubtful accounts, beginning of year
 
$
(14.5
)
 
$
(15.7
)
Additions
 
(13.6
)
 
(6.1
)
Amounts charged off
 
6.7

 
5.4

Unused amounts reversed
 
1.5

 
1.4

Exchange differences
 
(1.0
)
 
0.5

Allowance for doubtful accounts, end of year
 
$
(20.9
)
 
$
(14.5
)