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Income Taxes - Schedule of Income Tax Expense/(Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |
Income tax expense attributable to income from operations | $ 102.9 | $ 93.3 | $ 84.5
Taxes allocated to stockholders’ equity, related to pension liabilities | 0.0 | 0.3 | 0.2
Taxes allocated to stockholders’ equity, related to hedge accounting | 0.2 | 8.1 | 11.1
Total income tax expense | $ 103.1 | $ 101.7 | $ 95.8

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