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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Federal taxes payable to AEPC under the Tax Sharing Agreement	$ 44.5		$ 44.5
Federal taxes paid to AEPC under the Tax Sharing Agreement	65.1
Unrecognized tax benefits	26.1		26.1
Accrued interest	0.2		0.2
Accrued penalties	0.1		0.1
Unrecognized tax benefits which, if recognized, would impact the Company's effective tax rate	$ 8.0		$ 8.0
Effective tax rate (as a percent)	36.90%	36.30%	36.20%	36.50%
Combined federal and state expected statutory tax rate (as a percent)			39.40%	39.70%

X

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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