SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Allowance for doubtful accounts, early pay discounts, and sales returns
Valuation and qualifying accounts activity
Balance at Beginning of Period	$ 22.5	$ 21.9	$ 21.4
Charged to Revenue, Costs, and Expense	0.7	1.8	3.2
Charged to Other Accounts	0.2	(0.1)	(0.1)
Deductions Net of Recoveries	0.6	(1.1)	(2.6)
Balance at End of Period	24.0	22.5	21.9
Allowance for inventory valuation
Valuation and qualifying accounts activity
Balance at Beginning of Period	16.2	16.4	17.3
Charged to Revenue, Costs, and Expense	6.6	1.5	1.9
Charged to Other Accounts	1.4	(0.6)	(0.4)
Deductions Net of Recoveries	1.4	(1.1)	(2.4)
Balance at End of Period	$ 25.6	$ 16.2	$ 16.4