Segment Information Detailed Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 1,740.7	$ 1,535.2
Operating Profit	338.2	295.6
Operating Segments | Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	871.7	716.1
Operating Profit	206.4	158.5
Operating Segments | Industrial Technologies
Segment Reporting Information [Line Items]
Sales	869.0	819.1
Operating Profit	158.3	152.8
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Profit	$ (26.5)	$ (15.7)