Pension And Other Postretirement Benefits (Schedule Of Expected Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 10.7
2013	11.1
2014	11.9
2015	13.0
2016	13.9
2017-2021	82.3
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	3.0
2013	3.1
2014	3.4
2015	3.8
2016	4.2
2017-2021	37.5
Subsidy Receipts [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	0.2
2013	0.2
2014	0.2
2015	0.2
2016	0.2
2017-2021	$ 2.0