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Income Taxes (Disposal Groups, including Discontinued Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax expense (benefit) $ 18.3 $ (9.9) $ 24.2