Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Total share-based compensation expense | $ 47.2 | $ 25.7 | $ 45.5 |
| Liability Awards | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Total share-based compensation expense | 9.2 | 2.7 | 17.3 |
| Equity Awards | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Total share-based compensation expense | $ 38.0 | $ 23.0 | $ 28.2 |