Financial Instruments and Risk Management (Schedule of Fair Values of Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Not designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	$ 0.0	$ 0.1
Cash flow hedge | Designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	$ (4.5)	$ (2.4)