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Revenue and Segment Information - Reconciliation Of Operating Profit (Loss) From Segments To Consolidated (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Dec. 31, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Gross profit for reportable segments									$ 1,769.9	$ 2,046.2	$ 2,305.5
Gross profit	$ 497.6	$ 441.2	$ 374.3	$ 402.7	$ 485.7	$ 475.2	$ 499.0	$ 513.7	1,715.8	1,973.6	2,238.7
Operating Segments
Segment Reporting Information [Line Items]
Gross profit for reportable segments									1,769.9	2,046.2	2,305.5
Segment Reconciling Items
Segment Reporting Information [Line Items]
Less: unallocated manufacturing costs									$ (54.1)	$ (72.6)	$ (66.8)

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