Leases - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2023 USD ($) lease restaurant	Jun. 26, 2022 USD ($)	Jun. 25, 2023 USD ($) lease restaurant	Jun. 26, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income	$ 2.7	$ 3.0	$ 5.6	$ 6.0
Number of domestic leases for which the Company is contingently liable | lease	50		50
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 8.2		$ 8.2
Minimum
Lessee, Lease, Description [Line Items]
Initial term of franchise subleases	5 years		5 years
Maximum
Lessee, Lease, Description [Line Items]
Initial term of franchise subleases	10 years		10 years
United Kingdom franchise-owned restaurants
Lessee, Lease, Description [Line Items]
Number of units leased and subleased | restaurant	368		368
Initial lease terms on franchised sites	15 years		15 years