Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Dec. 30, 2018	Dec. 31, 2017
Components of Deferred Tax Assets and Liabilities
Depreciation and amortization	$ (15.6)	$ (13.4)
Employee compensation and benefit plans	52.0	57.3
Workers’ compensation	15.0	14.5
Unrealized gain on securities	(30.9)	(60.1)
Investment in equity affiliate	(15.8)	(15.5)
Loss carryforwards	30.8	38.8
Credit carryforwards	155.6	132.7
Other, net	3.9	3.1
Valuation allowance	(27.8)	(34.6)
Deferred Tax Assets, Net	$ 167.2	$ 122.8