Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted Cash	$ 2.2	$ 0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	223.0	208.9
Inventories:
Purchased components and raw material	88.3	87.3
Work in process	32.9	32.4
Finished goods	46.0	42.8
Inventories, net	167.2	162.5
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Expense	11.7	10.9
Nontrade Receivables	9.3	8.5
Maintenance and repair tooling	3.5	3.7
Income taxes	2.7	5.5
Other	3.1	0.4
Other	30.3	29.0
Property, plant and equipment:
Land	6.2	6.2
Buildings	81.1	80.4
Machinery and equipment	411.1	406.3
Construction in progress	67.5	57.4
Property, plant and equipment, gross	565.9	550.3
Accumulated depreciation	(304.5)	(296.5)
Property, plant and equipment net	261.4	253.8
Other Assets, Noncurrent [Abstract]
Operating lease, Right-of-Use asset	25.2	25.6
us-Maintenance, repair and tooling supplies	18.2	17.5
Nontrade Receivables, Noncurrent	2.0	2.1
Assets for Plan Benefits, Defined Benefit Plan	2.0	0.9
Notes Receivable, Related Parties, Noncurrent	1.8	1.8
Debt Issuance Costs, Noncurrent, Net	1.7	0.0
Other Assets, Miscellaneous, Noncurrent	2.4	3.4
Other noncurrent assets	53.3	51.3
Goodwill, Foreign Currency Translation Gain (Loss)	1.3
Goodwill	$ 101.1	$ 99.8