Segment Information - Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Net sales:
Net sales	$ 1,321.0	$ 805.7
Net sales, percentage change	64.00%
Operating income:
Operating income	$ 223.5	135.2
Total segment operating profit, percentage change	65.30%
Corporate
Operating income:
Operating income	$ (16.1)	(19.4)
Total segment operating profit, percentage change	(17.00%)
Corporate | FLIR
Operating income:
Acquisition related costs		5.9
Inter-segment sales
Net sales:
Net sales	$ 5.5	4.2
Digital Imaging
Net sales:
Net sales	750.5	263.3
Digital Imaging | Operating segments
Net sales:
Net sales	$ 750.5	263.3
Net sales, percentage change	185.00%
Operating income:
Operating income	$ 115.7	52.0
Total segment operating profit, percentage change	122.50%
Digital Imaging | Operating segments | FLIR
Operating income:
Revenue of acquiree since acquisition date		452.6
Instrumentation
Net sales:
Net sales	$ 308.9	286.5
Instrumentation | Operating segments
Net sales:
Net sales	$ 308.9	286.5
Net sales, percentage change	7.80%
Operating income:
Operating income	$ 71.6	59.4
Total segment operating profit, percentage change	20.50%
Aerospace and Defense Electronics
Net sales:
Net sales	$ 166.2	151.2
Aerospace and Defense Electronics | Operating segments
Net sales:
Net sales	$ 166.2	151.2
Net sales, percentage change	9.90%
Operating income:
Operating income	$ 42.9	28.3
Total segment operating profit, percentage change	51.60%
Engineered Systems
Net sales:
Net sales	$ 95.4	104.7
Engineered Systems | Operating segments
Net sales:
Net sales	$ 95.4	104.7
Net sales, percentage change	(8.90%)
Operating income:
Operating income	$ 9.4	$ 14.9
Total segment operating profit, percentage change	(36.90%)