DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 1,506.6	$ 3,012.9
Cost of revenues	1,244.5	2,336.7
Gross profit	262.1	676.2
Selling, general and administrative expenses	184.1	233.5
Amortization of intangibles and other assets	31.9	65.7
Goodwill and other asset impairments	0.0	9.8
Restructuring and other charges	3.0	29.8
Operating income	43.1	337.4
Interest expense	(0.5)	(0.5)
Investment income (expense)	(1.2)	(1.4)
Other, net	4.2	6.9
Earnings before income taxes	45.6	345.2
Provision for income taxes	6.8	68.1
Net earnings attributable to Labcorp Holdings Inc.	$ 38.8	$ 277.1