Related-Party Transactions (Related Party Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Related Party Transaction [Line Items]
License agreement improvement period	2 years
Affiliated Entity
Related Party Transaction [Line Items]
Related party expenses		$ 21.0
Affiliated Entity | Allocated corporate expenses
Related Party Transaction [Line Items]
Related party expenses		7.6
Affiliated Entity | Insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses		0.9
Affiliated Entity | Medical insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses		12.2
Affiliated Entity | Deferred compensation program expenses
Related Party Transaction [Line Items]
Related party expenses		$ 0.3