Leases - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025 USD ($) lease restaurant	Jun. 30, 2024 USD ($)	Jun. 29, 2025 USD ($) lease restaurant	Jun. 30, 2024 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income	$ 2.8	$ 2.1	$ 5.4	$ 4.4
Number of domestic leases for which the Company is contingently liable | lease	70		70
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 9.1		$ 9.1
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