Segment Information (Segment Information Of Revenues, Gross Profit And Operating Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 1,377.5	$ 1,390.9	$ 1,338.0	$ 1,436.7	$ 1,261.0	$ 950.9	$ 877.8	$ 817.2	$ 5,543.1	$ 3,906.9	$ 3,495.8
Segment gross profit									2,078.4	1,391.8	1,209.0
Power Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers									2,819.3	1,708.6	1,409.9
Segment gross profit									959.2	566.3	428.7
Analog Solutions Group
Segment Reporting Information [Line Items]
Revenues from external customers									1,950.9	1,481.5	1,338.6
Segment gross profit									817.2	589.0	537.9
Image Sensor Group
Segment Reporting Information [Line Items]
Revenues from external customers									772.9	716.8	747.3
Segment gross profit									$ 302.0	$ 236.5	$ 242.4