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Supplemental Balance Sheet Information (Schedule of Accrued Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Other current liabilities:    
Compensation and benefits $ 29.3 $ 40.2
Customer rebates 8.5 16.2
Accrued Income Taxes 0.3 7.5
Warranty accrual 7.6 6.5
Deferred Revenue 7.8 8.1
Customer Refund Liability, Current 5.3 4.2
Accrual for Taxes Other than Income Taxes 4.3 4.4
Operating lease liability, current 4.8 4.4
Workers' Compensation Liability, Current 2.9 4.6
CARES Act deferral, current portion 0.0 4.4
Restructuring reserve, current 1.2 3.3
Environmental 0.7 0.7
Interest Payable 5.3 5.3
Other Liabilities, Current 8.7 7.6
Accrued liabilities 86.7 117.4
Other Liabilities, Noncurrent [Abstract]    
Operating lease liability, noncurrent 20.6 22.4
Product Warranty Accrual, Noncurrent 3.4 4.2
Transition Tax Liability 3.1 4.1
Unrecognized Tax Benefits 4.9 4.7
New market tax credit liabilities 3.9 3.9
Workers' Compensation Liability, Noncurrent 6.3 6.5
Asset Retirement Obligation 3.6 3.6
Grant yet to be earned 2.5 2.5
Other Accrued Liabilities, Noncurrent 3.2 3.5
Other Liabilities, Noncurrent, Total $ 51.5 $ 55.4