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Income Taxes (Schedule Of Unrecognized Tax Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefit beginning of year $ 14.1 $ 15.0 $ 13.7
Tax positions related to current year:      
Additions 1.0 1.3 2.2
Tax positions related to prior years:      
Additions 0.4 0.8 0.3
Reductions 0.0 (3.0) (0.1)
Settlements 0.0 0.0 (0.6)
Statute expirations 0.0 0.0 (0.5)
Unrecognized tax benefit end of year $ 15.5 $ 14.1 $ 15.0