Retirement And Postretirement Benefit Plans (Schedule Of Valuation Of Pension Plan Assets By Pricing Categories) (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan, Fair Value of Plan Assets	$ 217.3	$ 215.7
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan, Fair Value of Plan Assets	162.1	163.7
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Cash [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2.3	3.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Equity [Member] \| US Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets	70.3	72.9
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Equity [Member] \| International Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets	30.7	33.4
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	58.4	53.4
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Others [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0.4	0.4
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan, Fair Value of Plan Assets	55.2	52.0
Significant Other Observable Inputs (Level 2) [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	55.2	52.0
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Significant Unobservable Inputs (Level 3) [Member] \| Cash [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Significant Unobservable Inputs (Level 3) [Member] \| Equity [Member] \| US Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Significant Unobservable Inputs (Level 3) [Member] \| Equity [Member] \| International Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Significant Unobservable Inputs (Level 3) [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Significant Unobservable Inputs (Level 3) [Member] \| Others [Member]
Defined Benefit Plan, Fair Value of Plan Assets
Cash [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2.3	3.6
Equity [Member] \| US Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets	70.3	72.9
Equity [Member] \| International Companies [Member]
Defined Benefit Plan, Fair Value of Plan Assets	30.7	33.4
Fixed Income Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	113.6	105.4
Others [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0.4	$ 0.4

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.