Segment Information Segment Information (Identifiable Assets) (Details) - USD ($) $ in Millions	Apr. 02, 2017	Jan. 01, 2017
Segment Reporting Information [Line Items]
Identifiable assets	$ 3,673.0	$ 2,774.4
Operating Segments | Instrumentation
Segment Reporting Information [Line Items]
Identifiable assets	1,388.2	1,361.0
Operating Segments | Digital Imaging
Segment Reporting Information [Line Items]
Identifiable assets	1,404.4	671.1
Operating Segments | Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Identifiable assets	610.1	449.4
Operating Segments | Engineered Systems
Segment Reporting Information [Line Items]
Identifiable assets	102.0	93.9
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Identifiable assets	$ 168.3	$ 199.0