Long-lived Tangible Asset Impairment and Closure Charges - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) restaurant	Dec. 31, 2019 USD ($) restaurant	Dec. 31, 2018 USD ($) restaurant
Restructuring Cost and Reserve [Line Items]
Operating lease, impairment loss	$ 15,100,000
Long-lived tangible asset impairment	22,300,000	$ 0	$ 100,000
Closure charges	3,000,000.0	$ 1,500,000	2,000,000.0
IHOP
Restructuring Cost and Reserve [Line Items]
Closure charges	$ 1,600,000		$ 1,800,000
Number of restaurants subject to closure charges | restaurant	7	2	1
IHOP and Applebee's
Restructuring Cost and Reserve [Line Items]
Closure charges		$ 500,000
Applebee's
Restructuring Cost and Reserve [Line Items]
Number of restaurants subject to closure charges | restaurant		1
Maximum
Restructuring Cost and Reserve [Line Items]
Long-lived tangible asset impairment per asset	$ 1,300,000
Minimum
Restructuring Cost and Reserve [Line Items]
Long-lived tangible asset impairment per asset	5,000
Land, Building, Leasehold Improvements And Finance Leases
Restructuring Cost and Reserve [Line Items]
Long-lived tangible asset impairment	$ 7,200,000
Applebee's | Entity Operated Units
Restructuring Cost and Reserve [Line Items]
Number of restaurants subject to asset impairment | restaurant	29
IHOP | Franchised
Restructuring Cost and Reserve [Line Items]
Number of restaurants subject to asset impairment | restaurant	41