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Income Taxes (Disposal Groups, including Discontinued Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax expense (benefit) $ 23.5 $ 22.0 $ 24.5