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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation |  |  |  |
Share-based compensation expenses capitalized as inventory |  |  | $ 1.3 | $ 1.3
Defined benefit plans |  |  |  |
Net periodic benefit cost | $ 3.3 | $ 2.7 | $ 6.6 | $ 5.4

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