Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Company Operated Restaurant Advertising Expense	$ 347.2	$ 334.5	$ 377.6
Other Marketing Related Expenses	$ 41.7	$ 63.8	$ 82.9