Income Taxes - Reconciliation of Beginning and Ending Balances of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Unrecognized Tax Benefits [Roll Forward] | ||
| Unrecognized Tax Benefits Balance at April 1 | $ 1.8 | $ 2.2 |
| Increases for tax provisions of current year | 0.0 | 0.0 |
| Decreases for tax provisions of prior year | (1.6) | (0.3) |
| Unrecognized Tax Benefits Balance at March 31 | $ 0.2 | $ 1.8 |