Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Account
Beginning Balance	$ 36.1		$ 36.8		$ 34.6
Charged (credited) to costs and expenses	30.2		26.5		20.0
Other	(26.8)	[1]	(27.2)	[1]	(17.8)	[1]
Ending Balance	39.5		36.1		36.8
Deferred tax assets valuation allowance [Member]
Valuation and Qualifying Account
Beginning Balance	77.0		78.2		74.7
Charged (credited) to costs and expenses	(5.7)		(4.0)		3.5
Other Acquisition			2.8
Other Recoveries	26.3	[2]			0
Ending Balance	$ 97.6		$ 77.0		$ 78.2

[1] Uncollectible accounts written off, net of recoveries.

[2] Acquisition.