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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Unrecognized Tax Benefits [Roll Forward] |  |
Beginning gross unrecognized tax benefit | $ 821.2 | $ 792.4
Decreases related to settlements with tax authorities | (50.4) | (0.7)
Decreases related to statute of limitation expirations | (5.1) | (6.9)
Increases related to current year tax positions | 8.8 | 27.1
Increases related to prior year tax positions | (83.2) |
(Decreases) related to prior year tax positions |  | 9.3
Ending gross unrecognized tax benefits | $ 691.3 | $ 821.2

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