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Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 5.1	$ 4.4	$ 4.6
Provision charged to expense	(3.4)	(2.2)	(2.0)
Inventory disposed	(1.2)	(1.2)	(2.1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	0.2	(0.3)	(0.1)
Balance at end of year	$ 7.5	$ 5.1	$ 4.4

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Amount of valuation reserve for inventory.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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