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OTHER GAINS - NET (Tables)
 12 Months Ended
Mar. 31, 2020
Analysis of income and expense [abstract]  
Schedule of other gains

 
2020

 
2019

Disposal of property, plant and equipment
$
7.0

$
1.2

Net gain on foreign currency exchange differences
 
41.6

 
24.8

Remeasurement of royalty obligations
 
1.9

 
7.9

Impairment of goodwill (Note 26)

 
(37.5
)
 
—

Other
 
(12.0
)
 
(11.6
)
Other gains – net
$
1.0

$
22.3