Summary Of Significant Accounting Policies (Schedule Of Composition Of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Summary Of Significant Accounting Policies
Available-for-sale securities and currency hedges, net of tax of $0.4, $0.4 and $0.5, respectively	$ (0.9)	$ (0.7)	$ (0.9)
Foreign currency translation adjustment, net of tax of $1.7, $2.2 and $3.5, respectively	(15.7)	(11.9)	(12.6)
Items not yet recognized as a component of net periodic pension and postretirement healthcare costs, net of tax of $38.2, $29.3 and $29.2, respectively	(62.4)	(49.2)	(46.4)
Total	(79.0)	(61.8)	(59.9)
Available-for-sale securities and currency hedges, tax	0.4	0.4	0.5
Foreign currency translation adjustment, tax	1.7	2.2	3.5
Items not yet recognized as a component of net periodic pension and postretirement healthcare costs, tax	$ 38.2	$ 29.3	$ 29.2