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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Abstract]
Unrecognized tax benefits, beginning of year	$ 20.9	$ 16.5	$ 12.4
Gross increase – tax positions in prior period	1.6	4.0	4.0
Gross decrease – tax positions in prior period	(7.8)	(0.5)	(0.4)
Gross increase – tax positions in current period	2.6	1.2	1.2
Settlements	(0.4)		(0.7)
Lapse of statutes of limitations	(0.2)	(0.3)
Unrecognized tax benefits, end of year	$ 16.7	$ 20.9	$ 16.5

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Amount of unrecognized tax benefits.

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