Revenue and Segment Information - Segment Information Of Revenues, Gross Profit And Operating Income (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Segment Reporting Information [Line Items]
Revenue	$ 1,277.9	$ 1,386.6
Gross profit for reportable segments	416.2	524.0
PSG
Segment Reporting Information [Line Items]
Revenue	623.9	704.2
Gross profit for reportable segments	178.6	249.0
ASG
Segment Reporting Information [Line Items]
Revenue	467.1	494.1
Gross profit for reportable segments	174.8	200.1
ISG
Segment Reporting Information [Line Items]
Revenue	186.9	188.3
Gross profit for reportable segments	$ 62.8	$ 74.9