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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation |  |  |  |
Share-based compensation expenses capitalized as inventory |  |  | $ 0.9 | $ 0.8
Defined benefit plans |  |  |  |
Net periodic benefit cost | $ 2.3 | $ 2.2 | $ 7.1 | $ 6.7

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