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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 141.2 $ 146.5 $ 227.5
Inventories:      
Purchased components and raw material 180.2 181.8  
Work in process 64.9 56.8  
Finished goods 67.6 40.1  
Inventories, net 312.7 278.7  
Prepaid Expense and Other Assets, Current [Abstract]      
Prepaid Expense 15.6 14.6  
Nontrade Receivables 1.7 1.6  
Maintenance and repair tooling 3.9 2.8  
Income taxes 0.8 0.8  
Nontrade Receivables, Current 1.5 2.6  
Other 3.7 4.4  
Other 27.2 26.8  
Property, plant and equipment:      
Land 6.6 5.7  
Buildings 104.0 87.6  
Machinery and equipment 505.7 456.0  
Construction in progress 59.4 104.7  
Property, plant and equipment, gross 675.7 654.0  
Accumulated depreciation (368.8) (352.4)  
Property, plant and equipment net 306.9 301.6  
Other Assets, Noncurrent [Abstract]      
Operating lease, Right-of-Use asset 25.2 26.0  
us-Maintenance, repair and tooling supplies 21.6 20.4  
Nontrade Receivables, Noncurrent 3.1 3.6  
Assets for Plan Benefits, Defined Benefit Plan 0.1 0.6  
Other Receivables 1.8 1.7  
Debt Issuance Costs, Noncurrent, Net 0.8 1.0  
Other Assets, Miscellaneous, Noncurrent 3.5 3.4  
Other noncurrent assets 56.1 56.7  
Goodwill, Foreign Currency Translation Gain (Loss) (1.6)    
Goodwill $ 97.0 $ 98.6