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Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 16.5 $ 14.8 $ 11.7
Provision charged to expense (3.8) (1.8) (5.9)
Inventory Valuation Allowances and Reserves, Deduction (2.5) (1.4) (3.6)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment (1.0) 1.3 0.8
Balance at end of year $ 16.8 $ 16.5 $ 14.8