Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Effective Income Tax Rate, Continuing Operations		33.20%	31.80%
State Tax Benefit Related to Reduction in State Deferred Taxes From Refranchising and Sale of Applebees Company Operated Restaurants	$ 6.3
Reduction to Effective Tax Rate and Income Tax Expense For Unrecognized Tax Benefits Related To Gift Card Income Deferral As Result Of New IRS Guidance Net				3
Unrecognized Tax Benefits Including Penalties and Interest	7.0	7.0
Unrecognized Tax Benefits Including Penalties and Interest Expected to be Paid Within One Year	0.9	0.9
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	1.9	1.9		3.0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0.4	0.4		0.3
Decrease in Accrued Interest Resulting From Release of Liabilities for Unrecognized Tax Benefits Related to Gift Card Income Deferral as a Result of New IRS Guidance, Net		$ 1.1

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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This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

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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