Retirement and Other Benefit Plans (Schedule Of Reconciliation Of Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Net benefit obligation at beginning of year	$ 95.3	$ 100.6
Interest cost	3.4	3.2	$ 3.9
Actuarial (gain) loss	(4.3)	(4.1)
Gross benefits paid	(4.6)	(4.4)
Settlements	0.0	0.0
Net benefit obligation at end of year	$ 89.8	$ 95.3	$ 100.6