Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2022 USD ($) restaurant	Oct. 03, 2021 USD ($) restaurant	Oct. 02, 2022 USD ($) restaurant	Oct. 03, 2021 USD ($) restaurant
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	$ 1.2	$ 0.8	$ 3.2	$ 1.3
Asset impairment charges	$ 0.4	$ 1.8	$ 0.6	$ 0.9
Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges, number of restaurants | restaurant	3	3	10	4
Previously Impaired
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges		$ 0.1	$ 0.4	$ 0.4
Closed Restaurants
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges, number of restaurants | restaurant	1		6
Other Impairments
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	$ 0.8	0.2	$ 1.5	0.4
Initial Impairment Charge [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	0.3	$ 0.5	1.4	$ 0.5
Capital Expenditures At Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	0.1
Other Lease Charges [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment and Other Lease Charges	$ 0.4		$ 1.0