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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax expense attributable to income from operations | $ 84.5 | $ 70.1 | $ 37.8
Taxes allocated to stockholders’ equity, related to pension liabilities | 0.2 | (0.1) | 0.5
Taxes allocated to stockholders’ equity, related to hedge accounting | 11.1 | (17.0) | 0.0
Total income tax expense | $ 95.8 | $ 53.0 | $ 38.3

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