Valuation And Qualifying Accounts (Details) - Allowance, Doubtful Accounts [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 3.6	$ 5.0	$ 5.0
Acquired allowance	1.6	0.3	0.3
Bad debt expense	3.4	1.2	3.0
Write-offs, net of recoveries	(4.0)	(2.9)	(3.3)
Balance at end of period	$ 4.6	$ 3.6	$ 5.0