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Employee Retirement Plans (Details 6) (VEBA Trust [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 11.7	$ 11.2
S&P 500 Index equity mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	7.7	7.7
Bond index mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3.8	3.4
Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0.2	0.1
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11.5	11.1
Fair Value, Inputs, Level 1 [Member] \| S&P 500 Index equity mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	7.7	7.7
Fair Value, Inputs, Level 1 [Member] \| Bond index mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3.8	3.4
Fair Value, Inputs, Level 1 [Member] \| Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0.2	0.1
Fair Value, Inputs, Level 2 [Member] \| S&P 500 Index equity mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] \| Bond index mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] \| Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0.2	0.1
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] \| S&P 500 Index equity mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] \| Bond index mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] \| Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
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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