Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans401(k) Savings and Investment PlanEffective January 1, 2013, the Company amended the Dine Brands Global, Inc. 401(k) Plan to (i) modify the Company matching formula and (ii) eliminate the one-year completed service requirement that previously had to be met to become eligible for Company matching contributions. As amended, the Company matches 100% of the first four percent of the employee's eligible compensation deferral and 50% of the next two percent of the employee's eligible compensation deferral. All contributions under this plan vest immediately. Company common stock is not an investment option for employees in the 401(k) Plan, other than shares transferred from a prior employee stock ownership plan. Substantially all of the administrative cost of the 401(k) plan is borne by the Company. The Company's matching contribution expense was $2.9 million, $2.8 million and $3.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.