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Summary of Significant Accounting Policies (Schedule of Allowance for Doubtful Receivables) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 3.5 $ 2.5 $ 1.5
Accounts Receivable, Credit Loss Expense (Reversal) 2.5 1.1 1.1
Balances written off, net of recoveries (0.4) (0.1) (0.1)
Balance at end of year 5.6 3.5 $ 2.5
Accounts Receivable, Allowance for Credit Loss, Current $ (5.6) $ (3.5)