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Other Income and Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Restructuring Charges $ 10.2 $ 7.2 $ 8.0  
Restructuring Costs 1.5 5.6    
Research and Development Expense 25.9 24.5 17.1  
Advertising Expense 4.7 5.5 3.2  
Interest Costs Capitalized (1.6) (2.6) (2.3)  
Interest Expense, Other 0.1 0.3 0.3  
Interest Expense 18.4 17.6 23.8  
Interest Income, Other (3.7) (0.7) (0.4)  
Interest expense, net 14.7 16.9 23.4  
Amortization of Debt Issuance Costs 1.0 1.0 1.1  
Severance Costs 3.2      
Other, net 0.9 1.3 1.3  
Restructuring Reserve 6.6 3.3 3.1 $ 2.8
Restructuring Charges 10.2 7.2 5.4  
Payments for Restructuring (6.9) (7.0) (5.1)  
Inventory Write-down 3.8 1.8 5.9  
Severance Costs 3.2      
Other, net 0.9 1.3 1.3  
Inventory Write-down 3.8 1.8 5.9  
Aurora/Surrey        
Inventory Write-down 2.4      
Inventory Write-down 2.4      
5.5% Senior Notes        
Interest Expense, Debt 0.0 0.0 17.6  
ABL Agreement        
Interest Expense, Debt 0.9 0.9 0.9  
4.0% Senior Notes        
Interest Expense, Debt $ 18.0 $ 18.0 $ 6.2