Restaurant Impairments, Closure Costs and Asset Disposals - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) restaurant	Jul. 02, 2019 USD ($) restaurant	Jul. 02, 2019 USD ($)
Property, Plant and Equipment Impairment or Disposal [Abstract]
Number of restaurants impaired | restaurant	5	2
Impairment charge for restaurants	$ 2.1	$ 2.2
Offset adjustment to closure costs related to lease terminations		$ 0.1	$ 0.4