Goodwill - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, impairment loss	$ 92.2	$ 92.2
Franchised \| Applebee's
Goodwill [Line Items]
Goodwill, impairment loss		92.2
Entity Operated Units \| Applebee's
Goodwill [Line Items]
Goodwill, impairment loss		$ 0.0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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