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Income Taxes (Income before Income Tax, Domestic and Foreign) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Loss before income taxes, U.S. | $ 83.2 | $ 81.6 | $ 94.0
Loss before income taxes, Non-U.S. | 25.8 | 17.0 | 0.9
Net Income Before Income Tax | $ 109.0 | $ 98.6 | $ 94.9

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