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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Inventories:    
Purchased components and raw material $ 94.0 $ 87.3
Work in process 34.3 32.4
Finished goods 51.1 42.8
Inventories, net 179.4 162.5
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Expense 10.5 10.9
Nontrade Receivables 6.0 8.5
Maintenance and repair tooling 3.1 3.7
Income taxes 0.3 5.5
Other 2.8 0.4
Other 22.7 29.0
Property, plant and equipment:    
Land 6.1 6.2
Buildings 81.9 80.4
Machinery and equipment 422.6 406.3
Construction in progress 68.4 57.4
Property, plant and equipment, gross 579.0 550.3
Accumulated depreciation (310.5) (296.5)
Property, plant and equipment net 268.5 253.8
Other Assets, Noncurrent [Abstract]    
Operating lease, Right-of-Use asset 24.7 25.6
us-Maintenance, repair and tooling supplies 18.7 17.5
Nontrade Receivables, Noncurrent 2.0 2.1
Assets for Plan Benefits, Defined Benefit Plan 3.1 0.9
Notes Receivable, Related Parties, Noncurrent 1.8 1.8
Debt Issuance Costs, Noncurrent, Net 1.5 1.3
Other Assets, Miscellaneous, Noncurrent 3.5 2.1
Other noncurrent assets 55.3 51.3
Workers' Compensation Liability, Current 2.9 2.7
Goodwill, Foreign Currency Translation Gain (Loss) 0.9  
Goodwill $ 100.7 $ 99.8