Other Income and Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Restructuring Costs	$ 1.5	$ 5.6
Research and Development Expense	24.5	17.1	$ 15.0
Advertising Expense	5.5	3.2	3.3
Interest Costs Capitalized	(2.6)	(2.3)	(0.3)
Interest Expense, Other	0.3	0.3	0.3
Interest Expense	17.6	23.8	26.6
Interest Income, Other	(0.7)	(0.4)	(1.1)
Interest expense, net	16.9	23.4	25.5
Amortization of Debt Issuance Costs	1.0	1.1	1.2
Severance Costs	3.2
Other, net	1.3	1.3	3.7
Restructuring Reserve	3.3	3.1	2.8	$ 1.7
Restructuring Charges	7.2	5.4	4.8
Payments for Restructuring	(7.0)	(5.1)	(3.7)
Inventory Write-down	1.8	5.9	4.7
Severance Costs	3.2
Other, net	1.3	1.3	3.7
Inventory Write-down	1.8	5.9	4.7
Aurora/Surrey
Inventory Write-down	2.4
Inventory Write-down	2.4
5.5% Senior Notes
Interest Expense, Debt	0.0	17.6	24.8
ABL Agreement
Interest Expense, Debt	0.9	0.9	0.6
4.0% Senior Notes
Interest Expense, Debt	$ 18.0	$ 6.2	$ 0.0