Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4.4	$ 4.6	$ 4.4
Provision charged to expense	(2.2)	(2.0)	(2.1)
Inventory disposed	(1.2)	(2.1)	(2.1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	(0.3)	(0.1)	0.2
Balance at end of year	$ 5.1	$ 4.4	$ 4.6