Segment Information (Identifiable Assets) (Details) - USD ($) $ in Millions	Mar. 29, 2020	Dec. 29, 2019
Segment Reporting Information [Line Items]
Identifiable assets	$ 4,585.0	$ 4,579.8
Operating Segments | Instrumentation
Segment Reporting Information [Line Items]
Identifiable assets	1,703.3	1,680.2
Operating Segments | Digital Imaging
Segment Reporting Information [Line Items]
Identifiable assets	1,837.5	1,874.6
Operating Segments | Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Identifiable assets	604.2	618.3
Operating Segments | Engineered Systems
Segment Reporting Information [Line Items]
Identifiable assets	157.6	143.4
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Identifiable assets	$ 282.4	$ 263.3