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Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts and Options (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Foreign Exchange Forward | Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | $ 677.5 | $ 835.4
Foreign Exchange Forward | Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 40.4 | 41.9
Options | Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 143.3 | 367.4
Options | Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | $ 58.0 | $ 89.4

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