Income Taxes (Schedule of Income before Income Tax, Domestic and Foreign) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
United States	$ (177.7)	$ (105.3)	$ (554.5)
Foreign	231.5	281.0	249.0
Earnings/(loss) before income taxes	$ 53.8	$ 175.7	$ (305.5)

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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+ Details