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Summary of Significant Accounting Policies (Schedule of Allowance for Doubtful Receivables) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 8.3 $ 7.3 $ 5.6
Accounts Receivable, Credit Loss Expense (Reversal) 0.2 2.7 1.9
Balances written off, net of recoveries (4.9) (1.7) (0.2)
Balance at end of year $ 3.6 $ 8.3 $ 7.3