Cover page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 23, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-15283
Entity Registrant Name	Dine Brands Global, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-3038279
Entity Address, Address Line One	450 North Brand Boulevard,
Entity Address, City or Town	Glendale,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91203-1903
City Area Code	(818)
Local Phone Number	240-6055
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	DIN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Smaller Company	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 603.7
Entity Common Stock, Shares Outstanding		16,645,115
Documents Incorporated by Reference	Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on Tuesday, May 11, 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Except as expressly incorporated by reference, the registrant’s Proxy Statement shall not be deemed to be part of this report.
Entity Central Index Key	0000049754
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false