Income Taxes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	38.20%	33.20%
State benefit related to a reduction in state deferred taxes as a result of the refranchising of applebee's company-operated restaurants		$ 6
Gross unrecognized tax benefit	2.0		6.7
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	4.7
Unrecognized tax benefits including penalties and interest expected to be paid within one year	0.7
Accrued interest on income taxes	2.6		1.4
Accrued penalties on income taxes	0.1		0.2
Increase (decrease) in accrued interest	$ 1.2