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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 243.3 $ 160.3 $ 141.2 $ 146.5
Inventories:        
Purchased components and raw material 165.8 176.9    
Work in process 61.3 60.0    
Finished goods 66.7 61.0    
Inventories, net 293.8 297.9    
Prepaid Expense and Other Assets, Current [Abstract]        
Prepaid Expense 16.2 17.8    
Nontrade Receivables 2.9 1.7    
Maintenance and repair tooling 5.2 4.1    
Other Inventory, Gross 4.6 3.9    
Income taxes 0.8 0.8    
Nontrade Receivables, Current 1.8 2.2    
Other 3.7 1.0    
Other 35.2 31.5    
Property, plant and equipment:        
Land 6.4 6.4    
Buildings 121.2 117.2    
Machinery and equipment 535.4 525.8    
Construction in progress 46.5 36.9    
Property, plant and equipment, gross 709.5 686.3    
Accumulated depreciation (399.7) (374.6)    
Property, plant and equipment net 309.8 311.7    
Other Assets, Noncurrent [Abstract]        
Operating lease, Right-of-Use asset 28.0 23.6    
us-Maintenance, repair and tooling supplies 20.9 21.1    
Nontrade Receivables, Noncurrent 4.6 2.4    
Assets for Plan Benefits, Defined Benefit Plan 5.5 6.6    
Other Receivables 1.8 1.8    
Debt Issuance Costs, Noncurrent, Net 1.4 0.7    
Other Assets, Miscellaneous, Noncurrent 0.2 2.6    
Other noncurrent assets $ 62.4 $ 58.8