Supplemental Financial Statement Information (Schedule Of Allowance For Doubtful Accounts) (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Allowance for Doubtful Accounts
Balance at beginning of year	$ 2.9	$ 2.9	$ 2.8
Provision charged to expense, net of reversals	1.9	(0.4)	1.2
Write-offs, less recoveries, translation, other	(0.2)	0.4	(1.1)
Balance at end of year	$ 4.6	$ 2.9	$ 2.9