Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Inventories | ||
| Reclassifications | ||
| Prior period reclassification adjustment | $ 11.0 | |
| Prior period immaterial reclassification adjustment not made | $ 9.2 | |
| Property, Plant and Equipment | ||
| Reclassifications | ||
| Prior period reclassification adjustment | 7.0 | |
| Cost of sales-product | ||
| Reclassifications | ||
| Prior period reclassification adjustment | $ 4.0 | |
| Prior period immaterial reclassification adjustment not made | $ 2.2 | |