Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022 USD ($) restaurant	Jul. 04, 2021 USD ($)	Jul. 03, 2022 USD ($) restaurant	Jul. 04, 2021 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	$ 1.5	$ 0.1	$ 2.0	$ 0.5
Asset impairment charges	$ 1.1	$ 1.4	$ 0.1	0.3
Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges, number of restaurants | restaurant	6		7
Previously Impaired
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges			$ 0.3
Closed Restaurants
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges, number of restaurants | restaurant	4		5
Initial Impairment Charge [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	$ 0.9		$ 1.0
Capital Expenditures At Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	0.2			0.3
Other Lease Charges [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	$ 0.4		$ 0.7	$ 0.2