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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 164.1 $ 227.5
Inventories:    
Purchased components and raw material 137.4 100.9
Work in process 46.4 41.6
Finished goods 45.4 42.2
Inventories, net 229.2 184.7
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Expense 13.1 12.8
Nontrade Receivables 10.7 10.7
Maintenance and repair tooling 2.3 2.9
Income taxes 0.2 0.2
Other Receivables 1.7 0.8
Other 3.6 1.9
Other 31.6 29.3
Property, plant and equipment:    
Land 5.5 6.1
Buildings 86.7 84.6
Machinery and equipment 446.1 433.3
Construction in progress 93.0 83.7
Property, plant and equipment, gross 631.3 607.7
Accumulated depreciation (339.0) (324.3)
Property, plant and equipment net 292.3 283.4
Other Assets, Noncurrent [Abstract]    
Operating lease, Right-of-Use asset 25.7 27.1
us-Maintenance, repair and tooling supplies 20.5 19.3
Nontrade Receivables, Noncurrent 5.0 2.7
Assets for Plan Benefits, Defined Benefit Plan 19.0 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 76.9 73.3
Goodwill, Foreign Currency Translation Gain (Loss) 0.6  
Goodwill 115.8 $ 115.1
Goodwill, Acquired During Period $ 0.1