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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