Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 27, 2019
Class of Stock
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (12.0)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (15.5)
Stock Repurchased During Period, Shares	700,000
Proceeds from (Repurchase of) Equity	$ 28.2
Stock Repurchases, Final Price Paid Per Share	$ 43.33
Discount for Stock Repurchase	3.00%
Cumulative Preferred Stock
Class of Stock
Preferred stock authorized			22,549
Preferred stock par value			$ 100
Preferred Stock
Class of Stock
Preferred stock authorized			3,000,000
Preferred stock par value			$ 1