Commitments And Contingencies (Schedule Of Reserve For Future Environmental Costs) (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011
Commitments And Contingencies [Line Items]
2012	$ 2.0
2013	1.1
2014	1.0
2015	1.0
2016	1.8
Thereafter	9.5
Total costs	16.4
Less imputed interest	(3.7)
Reserve amount	12.7
Recurring Costs [Member]
Commitments And Contingencies [Line Items]
2012	1.2
2013	0.6
2014	0.6
2015	0.7
2016	0.7
Thereafter	7.5
Total costs	11.3
Non-Recurring Costs [Member]
Commitments And Contingencies [Line Items]
2012	0.8
2013	0.5
2014	0.4
2015	0.3
2016	1.1
Thereafter	2.0
Total costs	$ 5.1