Leases - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022 USD ($) restaurant lease	Sep. 26, 2021 USD ($)	Sep. 25, 2022 USD ($) restaurant lease	Sep. 26, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income	$ 3.0	$ 2.9	$ 9.0	$ 9.0
Number of domestic leases for which the Company is contingently liable | lease	55		55
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 9.8		$ 9.8
United Kingdom franchise-owned restaurants
Lessee, Lease, Description [Line Items]
Number of units leased and subleased | restaurant	444		444
Initial lease terms on franchised sites	15 years		15 years