Income Taxes (Components Of Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Current federal income taxes	$ 111.2	$ 105.8	$ 178.1
Current state income taxes	19.6	0.6	24.9
Current foreign income taxes	1.1	1.0	(0.2)
Total current income taxes	131.9	107.4	202.8
Deferred federal income taxes	(34.2)	0.6	(38.3)
Deferred state income taxes	(15.1)	(3.4)	(2.6)
Deferred foreign income taxes	0.4	0.7	(5.0)
Total deferred income taxes	(48.9)	(2.1)	(40.3)
Total provision for income taxes (excluding income taxes on equity earnings)	83.0	105.3	156.9
Deferred income taxes on equity earnings	(48.9)	(2.1)	(40.3)
Total provision for income taxes (including income taxes on equity earnings)	83.0	105.3	162.5
Amount Not Related To Equity-Method Earnings [Member]
Total deferred income taxes			(45.9)
Deferred income taxes on equity earnings			(45.9)
Amount Related To Equity-Method Earnings [Member]
Total deferred income taxes			5.6
Deferred income taxes on equity earnings			$ 5.6