Related-Party Transactions (Related Party Expenses) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Related Party Transaction [Line Items]
License agreement improvement period		2 years
Affiliated Entity
Related Party Transaction [Line Items]
Related party expenses	$ 22.0		$ 43.0
Affiliated Entity | Allocated corporate expenses
Related Party Transaction [Line Items]
Related party expenses	8.4		16.0
Affiliated Entity | Insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses	1.0		1.9
Affiliated Entity | Medical insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses	12.3		24.5
Affiliated Entity | Deferred compensation program expenses
Related Party Transaction [Line Items]
Related party expenses	$ 0.3		$ 0.6