Income Taxes (Schedule Of Unrecognized Tax Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit beginning of year	$ 9.8	$ 14.8	$ 15.5
Tax positions related to current year:
Additions	1.5	1.5	0.9
Tax positions related to prior years:
Additions	1.4	0.0	1.0
Reductions	0.0	(4.7)	(1.6)
Settlements	(1.2)	0.0	(1.0)
Statute expirations	0.0	(1.8)	0.0
Unrecognized tax benefit end of year	$ 11.5	$ 9.8	$ 14.8