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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 154.9 $ 227.5
Inventories:    
Purchased components and raw material 154.6 100.9
Work in process 57.1 41.6
Finished goods 39.2 42.2
Inventories, net 250.9 184.7
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Expense 14.9 12.8
Nontrade Receivables 11.3 10.7
Maintenance and repair tooling 1.8 2.9
Income taxes 0.2 0.2
Other Receivables 1.8 0.8
Other 1.4 1.9
Other 31.4 29.3
Property, plant and equipment:    
Land 5.8 6.1
Buildings 86.1 84.6
Machinery and equipment 447.8 433.3
Construction in progress 99.2 83.7
Property, plant and equipment, gross 638.9 607.7
Accumulated depreciation (345.9) (324.3)
Property, plant and equipment net 293.0 283.4
Other Assets, Noncurrent [Abstract]    
Operating lease, Right-of-Use asset 26.5 27.1
us-Maintenance, repair and tooling supplies 21.0 19.3
Nontrade Receivables, Noncurrent 5.3 2.7
Assets for Plan Benefits, Defined Benefit Plan 20.0 16.8
Notes Receivable, Related Parties, Noncurrent 1.8 1.8
Debt Issuance Costs, Noncurrent, Net 1.1 1.3
Other Assets, Miscellaneous, Noncurrent 3.8 4.3
Other noncurrent assets 79.5 73.3
Goodwill, Foreign Currency Translation Gain (Loss) (6.6)  
Goodwill 108.6 $ 115.1
Goodwill, Acquired During Period $ 0.1