Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	$ 0.0	$ 0.0	$ 0.0	$ 1.0
Not Designated as Hedging Instrument \| Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Estimated Fair Value Liability	2.4		2.4		$ 2.9
Gain (Loss) Recognized in Income	$ 11.3	$ (0.9)	$ 6.4	$ (0.4)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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