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OTHER GAINS - NET (Tables)
 12 Months Ended
Mar. 31, 2019
Analysis of income and expense [abstract]  
Schedule of other gains

 
2019

 
2018

Disposal of property, plant and equipment
$
1.2

$
9.7

Net foreign exchange gains
 
24.8

 
2.5

Reversal of royalty obligations
 
7.9

 
2.0

Disposal of interest in investment
 
—

 
14.3

Remeasurement of investment, net of reorganization and others costs
 
3.7

 
12.2

Other
 
(15.3
)
 
(3.3
)
Other gains – net
$
22.3

$
37.4