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Receivables (Schedule Of Receivables Allowance) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Significant Accounting Policies And Practices [Abstract]      
Beginning Balance $ 23.5 $ 21.3 $ 15.8
Charged to Profit & Loss 9.8 4.1 8.2
Deductions (6.2) (2.9) (2.9)
Other Adjustments (0.2) 1.0 0.2
Ending Balance $ 26.9 $ 23.5 $ 21.3