Segment Information (Identifiable Assets) (Details) - USD ($) $ in Millions	Oct. 01, 2017	Jan. 01, 2017
Segment Reporting Information [Line Items]
Identifiable assets	$ 3,847.5	$ 2,774.4
Operating Segments | Instrumentation
Segment Reporting Information [Line Items]
Identifiable assets	1,428.1	1,361.0
Operating Segments | Digital Imaging
Segment Reporting Information [Line Items]
Identifiable assets	1,501.6	671.1
Operating Segments | Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Identifiable assets	619.6	449.4
Operating Segments | Engineered Systems
Segment Reporting Information [Line Items]
Identifiable assets	104.6	93.9
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Identifiable assets	$ 193.6	$ 199.0