Related-Party Transactions (Related Party Expenses) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Related Party Transaction [Line Items]
License agreement improvement period		2 years
Affiliated Entity
Related Party Transaction [Line Items]
Related party expenses	$ 19.1		$ 62.1
Affiliated Entity | Allocated corporate expenses
Related Party Transaction [Line Items]
Related party expenses	7.2		23.2
Affiliated Entity | Insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses	0.8		2.7
Affiliated Entity | Medical insurance programs expenses
Related Party Transaction [Line Items]
Related party expenses	11.0		35.5
Affiliated Entity | Deferred compensation program expenses
Related Party Transaction [Line Items]
Related party expenses	$ 0.1		$ 0.7