Income Taxes (Schedule Of Unrecognized Tax Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit beginning of year	$ 14.8	$ 15.5	$ 14.1
Tax positions related to current year:
Additions	1.5	0.9	1.0
Tax positions related to prior years:
Additions	0.0	1.0	0.4
Reductions	(4.7)	(1.6)	0.0
Settlements	0.0	(1.0)	0.0
Statute expirations	(1.8)	0.0	0.0
Unrecognized tax benefit end of year	$ 9.8	$ 14.8	$ 15.5