CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Income Statement [Abstract]
Net sales	$ 1,374.1	$ 1,424.7	$ 2,724.2	$ 2,808.0
Costs and expenses
Cost of sales	781.5	806.3	1,551.7	1,597.0
Selling, general and administrative	296.5	313.0	592.7	613.4
Acquired intangible asset amortization	49.1	49.3	98.5	99.0
Total costs and expenses	1,127.1	1,168.6	2,242.9	2,309.4
Operating income (loss)	247.0	256.1	481.3	498.6
Interest and debt income (expense), net	(15.8)	(22.3)	(28.5)	(43.3)
Gain (loss) on debt extinguishment	0.0	1.6	0.0	1.6
Non-service retirement benefit income (expense), net	2.7	2.9	5.4	6.2
Other income (expense), net	(2.2)	(3.4)	(1.0)	(4.5)
Income (loss) before income taxes	231.7	234.9	457.2	458.6
Provision (benefit) for income taxes	51.4	49.4	97.8	94.3
Net income (loss) including noncontrolling interest	180.3	185.5	359.4	364.3
Less: Net income (loss) attributable to noncontrolling interest	0.1	0.2	0.7	0.3
Net income (loss) attributable to Teledyne	$ 180.2	$ 185.3	$ 358.7	$ 364.0
Basic earnings per common share (in USD per share)	$ 3.82	$ 3.94	$ 7.58	$ 7.74
Weighted average common shares outstanding (in shares)	47.2	47.0	47.3	47.0
Diluted earnings per common share (in USD per share)	$ 3.77	$ 3.87	$ 7.49	$ 7.60
Weighted average diluted common shares outstanding (in shares)	47.8	47.9	47.9	47.9