Defined Benefit Pension and Other Postretirement Plans (Details 1) (USD $) In Millions	3 Months Ended
Dec. 31, 2010
Change in benefit obligations:
Benefit obligations - October 1,2010	$ 465.0
Service cost	2.2
Interest cost	5.8
Actuarial gain	(30.6)
Benefits paid	(4.7)
Benefits obligations - December 31, 2010	437.7
Change in plan assets:
Fair value of plan assets - October 1, 2010	287.9
Actual gain on assets	19.3
Employer contributions	1.8
Benefits paid	(4.7)
Fair value of plan assets - December 31, 2010	304.3
Funded status of the merged plan - December 31,2010	(133.4)
Liabilities recorded in the balance sheet:
Unfunded liabilities - included in other current liabilities	(20.3)
Unfunded liabilities - included in other noncurrent liabilities	(113.1)
Net amount recognized	(133.4)
Amounts Recorded In Regulatory Assets And Liabilities Pre Tax Abstract
Prior service cost	0.3
Net actuarial loss	112.7
Total	113.0
Amounts recorded in stockholders' equity:
Prior service cost	0.1
Net actuarial loss	9.8
Total	$ 9.9

Amounts Recorded In Regulatory Assets And Liabilities Pre Tax.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The aggregate net gain (loss) recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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The aggregate net prior service cost or credit recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The increase in the fair value of plan assets from contributions made by the employer.

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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