Revenues - Schedule of Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Franchise Revenues
Disaggregation of Revenue [Line Items]
Total franchise revenues	$ 665.5	$ 686.0	$ 706.4
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenues	307.8	313.4	325.6
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenues	281.8	290.4	300.8
Proprietary product sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenues	66.9	72.4	71.1
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenues	$ 9.0	$ 9.7	$ 8.9