Segment Information Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jul. 01, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jul. 01, 2016 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			2
Segment Reporting Information [Line Items]
Sales	$ 1,628.8	$ 1,555.1	$ 3,164.0	$ 3,029.8
Operating profit	348.3	322.1	643.2	585.1
Operating Segments | Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	759.0	724.2	1,475.1	1,421.6
Operating profit	184.9	162.4	342.9	308.4
Operating Segments | Industrial Technologies
Segment Reporting Information [Line Items]
Sales	869.8	830.9	1,688.9	1,608.2
Operating profit	181.5	173.4	334.1	304.1
Other
Segment Reporting Information [Line Items]
Operating profit	$ (18.1)	$ (13.7)	$ (33.8)	$ (27.4)