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Income Taxes (Gross Unrecognized Tax Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Unrecognized Tax Benefits [Roll Forward]    
Balance at beginning of year $ 4.7 $ 4.8
Increases related to current year positions 1.0 0.7
Decreases due to lapse in statute of limitations (0.6) (0.3)
Balance at end of year $ 5.0 $ 4.7