Segment Information - Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Net sales:
Net sales	$ 1,355.8	$ 1,121.0	$ 2,676.8	$ 1,926.7
Net sales, percentage change	20.90%		38.90%
Operating income:
Operating income	$ 229.5	104.4	$ 453.0	239.6
Total segment operating profit, percentage change	119.80%		89.10%
Corporate
Operating income:
Operating income	$ (14.7)	(84.2)	$ (30.8)	(103.6)
Total segment operating profit, percentage change	(82.50%)		(70.30%)
Corporate | FLIR
Operating income:
Acquisition related costs		70.5		76.4
Inter-segment sales
Net sales:
Net sales	$ 5.1	5.1	$ 10.6	9.3
Digital Imaging
Net sales:
Net sales	775.8	579.5	1,526.3	842.8
Digital Imaging | Operating segments
Net sales:
Net sales	$ 775.8	579.5	$ 1,526.3	842.8
Net sales, percentage change	33.90%		81.10%
Operating income:
Operating income	$ 117.9	84.6	$ 233.6	136.6
Total segment operating profit, percentage change	39.40%		71.00%
Digital Imaging | Operating segments | FLIR
Operating income:
Revenue of acquiree since acquisition date	$ 167.6		$ 620.2
Instrumentation
Net sales:
Net sales	312.5	291.1	621.4	577.6
Instrumentation | Operating segments
Net sales:
Net sales	$ 312.5	291.1	$ 621.4	577.6
Net sales, percentage change	7.40%		7.60%
Operating income:
Operating income	$ 73.6	64.6	$ 145.2	124.0
Total segment operating profit, percentage change	13.90%		17.10%
Aerospace and Defense Electronics
Net sales:
Net sales	$ 168.8	152.4	$ 335.0	303.6
Aerospace and Defense Electronics | Operating segments
Net sales:
Net sales	$ 168.8	152.4	$ 335.0	303.6
Net sales, percentage change	10.80%		10.30%
Operating income:
Operating income	$ 44.1	28.4	$ 87.0	56.7
Total segment operating profit, percentage change	55.30%		53.40%
Engineered Systems
Net sales:
Net sales	$ 98.7	98.0	$ 194.1	202.7
Engineered Systems | Operating segments
Net sales:
Net sales	$ 98.7	98.0	$ 194.1	202.7
Net sales, percentage change	0.70%		(4.20%)
Operating income:
Operating income	$ 8.6	$ 11.0	$ 18.0	$ 25.9
Total segment operating profit, percentage change	(21.80%)		(30.50%)