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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Inventories:        
Purchased components and raw material $ 102.2 $ 102.2 $ 87.3  
Work in process 31.2 31.2 32.4  
Finished goods 43.5 43.5 42.8  
Inventories, net 176.9 176.9 162.5  
Prepaid Expense and Other Assets, Current [Abstract]        
Prepaid Expense 10.7 10.7 10.9  
Nontrade Receivables 7.1 7.1 8.5  
Other Receivables 1.1 1.1   $ 0.0
Maintenance and repair tooling 2.7 2.7 3.7  
Income taxes 0.6 0.6 5.5  
Other 4.0 4.0 0.4  
Other 26.2 26.2 29.0  
Property, plant and equipment:        
Land 6.1 6.1 6.2  
Buildings 81.6 81.6 80.4  
Machinery and equipment 428.4 428.4 406.3  
Construction in progress 76.0 76.0 57.4  
Property, plant and equipment, gross 592.1 592.1 550.3  
Accumulated depreciation (316.8) (316.8) (296.5)  
Property, plant and equipment net 275.3 275.3 253.8  
Other Assets, Noncurrent [Abstract]        
Operating lease, Right-of-Use asset 24.0 24.0 25.6  
us-Maintenance, repair and tooling supplies 19.1 19.1 17.5  
Nontrade Receivables, Noncurrent 3.2 3.2 0.0  
Assets for Plan Benefits, Defined Benefit Plan 4.2 4.2 0.9  
Notes Receivable, Related Parties, Noncurrent 1.8 1.8 1.8  
Debt Issuance Costs, Noncurrent, Net 1.4 1.4 1.3  
Other Assets, Miscellaneous, Noncurrent 5.2 5.2 4.2  
Other noncurrent assets 58.9 58.9 51.3  
Workers' Compensation Liability, Current 3.6 3.6 2.7  
Goodwill, Foreign Currency Translation Gain (Loss)   2.6    
Goodwill 116.0 $ 116.0 $ 99.8  
Goodwill, Acquired During Period $ 13.6