Revenues - Schedule of Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Franchise Revenues
Disaggregation of Revenue [Line Items]
Total franchise revenues	$ 164.9	$ 166.2
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenues	75.2	76.3
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenues	71.0	70.5
Proprietary product sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenues	16.2	17.1
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenues	$ 2.5	$ 2.4