Other Intangible Assets - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) restaurant	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) restaurant
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense including leaseholds	$ 10.9	$ 11.7	$ 10.1
Amortization expense 2021	10.7
Amortization expense 2022	10.7
Amortization expense 2023	10.7
Amortization expense 2024	10.7
Amortization expense 2025	$ 10.7
Weighted average life of intangible assets subject to amortization	19 years 10 months 24 days	18 years 6 months
Applebee's
Finite-Lived Intangible Assets [Line Items]
Number of restaurants | restaurant	1,711
Entity Operated Units | Applebee's
Finite-Lived Intangible Assets [Line Items]
Number of restaurants | restaurant	69		69
Not Subject to Amortization | Tradename
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, indefinite-lived	$ 11.0
Subject to Amortization | Reacquired Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Additions			$ 11.6
Impairment of intangible assets, finite-lived	3.3
Finite-lived intangible assets, amortization expense including leaseholds	$ 0.8	$ 1.7	$ 0.1