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OTHER GAINS - NET (Tables) | 12 Months Ended
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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 |

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