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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 207.3 $ 227.5
Inventories:    
Purchased components and raw material 125.9 100.9
Work in process 41.5 41.6
Finished goods 42.3 42.2
Inventories, net 209.7 184.7
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid Expense 13.8 12.8
Nontrade Receivables 10.0 10.7
Maintenance and repair tooling 2.7 2.9
Income taxes 0.2 0.2
Other Receivables 0.8 0.8
Other 3.1 1.9
Other 30.6 29.3
Property, plant and equipment:    
Land 5.5 6.1
Buildings 84.4 84.6
Machinery and equipment 436.2 433.3
Construction in progress 91.5 83.7
Property, plant and equipment, gross 617.6 607.7
Accumulated depreciation (330.7) (324.3)
Property, plant and equipment net 286.9 283.4
Other Assets, Noncurrent [Abstract]    
Operating lease, Right-of-Use asset 26.4 27.1
us-Maintenance, repair and tooling supplies 19.8 19.3
Nontrade Receivables, Noncurrent 2.7 2.7
Assets for Plan Benefits, Defined Benefit Plan 17.9 16.8
Notes Receivable, Related Parties, Noncurrent 1.8 1.8
Debt Issuance Costs, Noncurrent, Net 1.2 1.3
Other Assets, Miscellaneous, Noncurrent 4.2 4.3
Other noncurrent assets 74.0 73.3
Goodwill, Foreign Currency Translation Gain (Loss) 2.8  
Goodwill 117.7 $ 115.1
Goodwill, Acquired During Period $ (0.2)