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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Kansas High Performance Incentive Program (HPIP) credits
Unrecognized tax benefits	$ 41.1
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate	13.1
Accrued interest	1.1
Effective tax rate (as a percent)	30.60%	37.80%
Combined federal and state expected statutory tax rate (as a percent)	39.20%	39.40%
American Entertainment Properties Corp
Kansas High Performance Incentive Program (HPIP) credits
Federal taxes payable to AEPC under the Tax Sharing Agreement	$ 57.2

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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 gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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