Segment Reporting - Revenues by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Schedule Of Revenues From External Customers [Line Items]
Total	$ 2,073.3	$ 1,953.5	$ 1,795.4
United States
Schedule Of Revenues From External Customers [Line Items]
Total	1,493.7	1,429.6	1,210.0
United Kingdom
Schedule Of Revenues From External Customers [Line Items]
Total	157.8	142.2	172.0
Canada
Schedule Of Revenues From External Customers [Line Items]
Total	69.9	64.1	67.0
All other countries
Schedule Of Revenues From External Customers [Line Items]
Total	$ 351.9	$ 317.6	$ 346.4