CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022
Income Statement [Abstract]
Net sales	$ 1,402.5	$ 1,363.6	$ 4,210.5	$ 4,040.4
Costs and expenses
Cost of sales	797.2	785.8	2,394.2	2,327.0
Selling, general and administrative	291.9	283.7	905.3	861.4
Acquired intangible asset amortization	49.1	48.9	148.1	153.8
Total costs and expenses	1,138.2	1,118.4	3,447.6	3,342.2
Operating income (loss)	264.3	245.2	762.9	698.2
Interest and debt income (expense), net	(18.4)	(22.0)	(61.7)	(66.8)
Gain (loss) on debt extinguishment	0.0	0.0	1.6	10.6
Non-service retirement benefit income (expense), net	3.1	2.9	9.3	8.6
Other income (expense), net	(2.9)	5.2	(7.4)	5.2
Income (loss) before income taxes	246.1	231.3	704.7	655.8
Provision (benefit) for income taxes	47.3	53.1	141.6	93.7
Net income (loss) including noncontrolling interest	198.8	178.2	563.1	562.1
Less: Net income (loss) attributable to noncontrolling interest	0.2	(0.1)	0.5	(0.1)
Net income (loss) attributable to Teledyne	$ 198.6	$ 178.3	$ 562.6	$ 562.2
Basic earnings per common share (in USD per share)	$ 4.22	$ 3.81	$ 11.97	$ 12.01
Weighted average common shares outstanding (in shares)	47.1	46.8	47.0	46.8
Diluted earnings per common share (in USD per share)	$ 4.15	$ 3.74	$ 11.75	$ 11.79
Weighted average diluted common shares outstanding (in shares)	47.9	47.7	47.9	47.7