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Income Taxes - Schedule of Components of Income from Operations, Before Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating Loss Carryforwards [Line Items]
U.S.	$ 148.9	$ 97.8	$ 135.1
Income before tax	408.8	354.1	323.0
Brazil
Operating Loss Carryforwards [Line Items]
Non-U.S.	44.6	37.8	35.3
Germany
Operating Loss Carryforwards [Line Items]
Non-U.S.	11.1	12.1	13.3
Singapore
Operating Loss Carryforwards [Line Items]
Non-U.S.	70.3	55.1	38.1
United Kingdom
Operating Loss Carryforwards [Line Items]
Non-U.S.	65.4	121.3	77.7
Other international
Operating Loss Carryforwards [Line Items]
Non-U.S.	$ 68.5	$ 30.0	$ 23.5

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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