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Employee Retirement Plans (Details 6) (VEBA Trust [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Fair Value of Plan Assets
Fair Value of Plan Assets	$ 11.2	$ 9.8
Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	7.7	6.1
Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	3.4	3.3
Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0.1	0.4
Quoted Prices In Active Market For Identical Assets And Liabilities (Level 1) [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	11.1	9.4
Quoted Prices In Active Market For Identical Assets And Liabilities (Level 1) [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	7.7	6.1
Quoted Prices In Active Market For Identical Assets And Liabilities (Level 1) [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	3.4	3.3
Quoted Prices In Active Market For Identical Assets And Liabilities (Level 1) [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Significant Other Observable Inputs (Level 2) [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0.1	0.4
Significant Other Observable Inputs (Level 2) [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Significant Other Observable Inputs (Level 2) [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Significant Other Observable Inputs (Level 2) [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets	0.1	0.4
Unobservable Inputs (Level 3) [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Unobservable Inputs (Level 3) [Member] \| Equity Securities Domestic [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Unobservable Inputs (Level 3) [Member] \| Fixed Income Funds [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets
Unobservable Inputs (Level 3) [Member] \| Cash and Cash Equivalents [Member]
Fair Value of Plan Assets
Fair Value of Plan Assets

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.

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