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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 89.2 $ 146.5
Inventories:    
Purchased components and raw material 197.1 181.8
Work in process 60.5 56.8
Finished goods 64.2 40.1
Inventories, net 321.8 278.7
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Expense 17.7 14.6
Nontrade Receivables 1.7 1.6
Maintenance and repair tooling 3.8 2.8
Income taxes 0.8 0.8
Other Receivables 1.4 2.6
Other 3.9 4.4
Other 29.3 26.8
Property, plant and equipment:    
Land 6.6 5.7
Buildings 103.9 87.6
Machinery and equipment 501.3 456.0
Construction in progress 53.6 104.7
Property, plant and equipment, gross 665.4 654.0
Accumulated depreciation (360.5) (352.4)
Property, plant and equipment net 304.9 301.6
Other Assets, Noncurrent [Abstract]    
Operating lease, Right-of-Use asset 24.3 26.0
us-Maintenance, repair and tooling supplies 21.0 20.4
Nontrade Receivables, Noncurrent 2.8 3.6
Assets for Plan Benefits, Defined Benefit Plan 0.2 0.6
Notes Receivable, Related Parties, Noncurrent 1.8 1.7
Debt Issuance Costs, Noncurrent, Net 0.8 1.0
Other Assets, Miscellaneous, Noncurrent 3.9 3.4
Other noncurrent assets 54.8 56.7
Goodwill, Foreign Currency Translation Gain (Loss) 0.4  
Goodwill $ 99.0 $ 98.6