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Derivatives (Summary Of Gain (Loss) Associated With Derivative Contracts Not Designated As Hedges) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Foreign Exchange Contracts [Member] | Other Non-Operating [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives recognized in operations $ (2.3) $ 1.9 $ 3.1