Other Expense (Income), Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Other Income and Expenses [Abstract]
Business Combination, Contingent Consideration Arrangements, Description			For the three quarters ended September 26, 2020, income represents a gain on the settlement of the final contingent consideration obligation payable under an earn-out arrangement with the former unitholders of Citrusource, LLC, which was acquired by the Company in March 2015.  On May 5, 2020, the parties agreed to settle the obligation for $2.0 million, of which $1.0 million was paid at the time of settlement and the remainder is being paid over the subsequent 10 months.
Current portion of long term liability settlement	$ 0.6		$ 0.6		$ 4.3
Loss on settlement of customer claim	2.4		2.4
Payment for cash settlement	4.4		4.4
Gain on settlement of an unrelated legal matter	1.7		1.7
Employee termination and recruitment costs in connection with Value Creation Plan	$ 0.1	$ 3.4	1.6	$ 6.9
Reversal of previously recognized stock-based compensation expense related to forfeited awards		$ 0.8	$ 0.9	$ 2.9