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Other Income and Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Restructuring Costs $ 5.6 $ 2.5    
Research and Development Expense 17.1 15.0 $ 14.3  
Advertising Expense 3.2 3.3 7.1  
Interest Costs Capitalized (2.3) (0.3) (3.0)  
Interest Expense, Other 0.3 0.3 0.2  
Interest Expense 23.8 26.6 23.3  
Interest Income, Other (0.4) (1.1) (3.5)  
Interest expense, net 23.4 25.5 19.8  
Amortization of Debt Issuance Costs 1.1 1.2 1.2  
Severance Costs 3.2      
Other, net 1.3 3.7 2.4  
Restructuring Reserve 3.1 2.8 1.7 $ 0.9
Restructuring Charges 5.4 4.8 6.6  
Payments for Restructuring (5.1) (3.7) (5.8)  
Inventory Write-down 5.9 4.7 3.4  
Severance Costs 3.2      
Other, net 1.3 3.7 2.4  
Inventory Write-down 5.9 4.7 3.4  
Aurora/Surrey        
Restructuring Costs 14.0      
Severance Costs 4.8      
Other Restructuring Costs 9.2      
Other, net 3.6      
Inventory Write-down 2.4      
Severance Costs 4.8      
Other Restructuring Costs 9.2      
Other, net 3.6      
Inventory Write-down 2.4      
Albertville        
Restructuring Costs 2.1      
5.5% Senior Notes        
Interest Expense, Debt 17.6 24.8 24.8  
ABL Agreement        
Interest Expense, Debt 0.9 0.6 0.6  
4.0% Senior Notes        
Interest Expense, Debt $ 6.2 $ 0.0 $ 0.0