SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Allowance for doubtful accounts, early pay discounts, and sales returns
Valuation and qualifying accounts activity
Balance at Beginning of Period	$ 21.0	$ 20.0	$ 19.2
Charged to Revenue, Costs, and Expense	2.5	3.7	2.4
Charged to Other Accounts	0.1	0.4	(0.2)
Deductions Net of Recoveries	(2.0)	(3.1)	(1.4)
Balance at End of Period	21.6	21.0	20.0
Allowance for inventory valuation
Valuation and qualifying accounts activity
Balance at Beginning of Period	18.0	14.8	14.6
Charged to Revenue, Costs, and Expense	2.4	4.3	3.4
Charged to Other Accounts	0.8	0.6	(1.2)
Deductions Net of Recoveries	(2.2)	(1.7)	(2.0)
Balance at End of Period	$ 19.0	$ 18.0	$ 14.8