Schedule of Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Other current liabilities:
Compensation and benefits	$ 23.6	$ 35.5
Customer rebates	12.1	9.6
Warranty	6.5	7.2
Deferred Revenue	5.1	5.6
Customer Refund Liability, Current	5.1	4.3
Accrual for Taxes Other than Income Taxes	4.1	3.9
Operating lease liability, current	3.8	4.0
Estimated Litigation Liability, Current	3.8	0.2
CARES Act deferral, current portion	3.1	0.0
Restructuring reserve, current	1.9	2.8
Environmental	1.2	1.2
Interest Payable	1.1	7.3
Accrued Income Taxes	0.2	0.2
Other Liabilities, Current	5.4	4.8
Accrued liabilities	77.0	86.6
Other Liabilities, Noncurrent [Abstract]
Operating lease liability, noncurrent	23.0	23.3
Standard Product Warranty Accrual, Noncurrent	6.8	7.2
CARES Act Deferrals	3.1	3.3
Transition Tax Liability	5.2	5.2
Unrecognized Tax Benefits	4.6	4.5
New market tax credit liabilities	3.9	0.0
Workers' Compensation Liability, Noncurrent	3.8	3.8
Asset Retirement Obligation	3.6	3.5
Grant yet to be earned	2.5	2.5
Other Accrued Liabilities, Noncurrent	3.7	3.0
Other Liabilities, Noncurrent, Total	$ 60.2	$ 56.3