Description Of Business And Accounting Policies (Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 7.0	$ 5.9	$ 4.6	$ 3.6
Acquired allowances	0.0	0.2	1.6
Provision for credit losses	7.1	6.5	3.4
Write-offs, net of recoveries	(6.0)	(5.4)	(4.0)
Balance at end of period	$ 7.0	$ 5.9	$ 4.6