Leases - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2023 USD ($) lease restaurant	Sep. 25, 2022 USD ($)	Sep. 24, 2023 USD ($) lease restaurant	Sep. 25, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income	$ 2.3	$ 3.0	$ 8.0	$ 9.0
Number of domestic leases for which the Company is contingently liable | lease	49		49
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 7.7		$ 7.7
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	340		340
Initial lease terms on franchised sites	15 years		15 years