Retirement Benefits Plans (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Retirement Benefits [Abstract] | |||
| Defined contribution plan, expense | $ 138.9 | $ 125.7 | $ 96.7 |
| Accrued defined contribution plan | $ 9.1 | $ 15.1 | |