Segment Information (Identifiable Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 30, 2018
Segment Reporting Information [Line Items]
Identifiable assets	$ 4,161.7	$ 3,809.3
Operating Segments | Instrumentation
Segment Reporting Information [Line Items]
Identifiable assets	1,422.2	1,392.7
Operating Segments | Digital Imaging
Segment Reporting Information [Line Items]
Identifiable assets	1,832.2	1,600.9
Operating Segments | Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Identifiable assets	597.4	521.4
Operating Segments | Engineered Systems
Segment Reporting Information [Line Items]
Identifiable assets	117.6	116.6
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Identifiable assets	$ 192.3	$ 177.7