Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Year	$ 24.8	$ 22.2	$ 25.3
Additions Charged to Costs and Expenses	10.9	8.1	6.5
Additions Charged to Other Accounts	0.0	0.0	0.0
Deductions	11.2	5.5	9.6
Balance at End of Year	24.5	24.8	22.2
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Year	22.2	27.8	28.3
Additions Charged to Costs and Expenses	1.0	2.5	4.0
Additions Charged to Other Accounts	0.6	0.0	0.5
Deductions	6.5	8.1	5.0
Balance at End of Year	$ 17.3	$ 22.2	$ 27.8