CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Earnings (Loss)
Common Stock, Value, Outstanding	$ 8.5
Additional Paid in Capital	0.0
Retained Earnings	10,456.8
Accumulated Other Comprehensive Earnings (Loss)	(191.9)
BALANCE at Dec. 31, 2021	10,273.4
Net earnings attributable to Labcorp Holdings Inc.	1,279.1	$ 0.0	$ 0.0	$ 1,279.1	$ 0.0
Other Comprehensive Income (Loss), Net of Tax	(301.3)	0.0	0.0	0.0	(301.3)
Issuance of common stock under employee stock plans	50.6	0.0	50.6	0.0	0.0
Net share settlement tax payments from issuance of stock to employees	50.6	0.0	50.6	0.0	0.0
Stock compensation	144.1	0.0	144.1	0.0	0.0
Purchase of common stock	(1,100.0)	(0.4)	(144.1)	(955.5)	0.0
BALANCE at Dec. 31, 2022	10,096.6
Dividends declared	(198.7)	0.0	0.0	(198.7)	0.0
Common Stock, Value, Outstanding	8.1
Additional Paid in Capital	0.0
Retained Earnings	10,581.7
Accumulated Other Comprehensive Earnings (Loss)	(493.2)				(493.2)
Net earnings attributable to Labcorp Holdings Inc.	418.0	0.0	0.0	418.0	0.0
Other Comprehensive Income (Loss), Net of Tax	195.9	0.0	0.0	0.0	195.9
Issuance of common stock under employee stock plans	55.2	0.0	55.2	0.0	0.0
Net share settlement tax payments from issuance of stock to employees	40.9	0.0	40.9	0.0	0.0
Stock compensation	147.3	0.0	147.3	0.0	0.0
Purchase of common stock	(1,009.0)	(0.4)	(123.2)	(885.4)	0.0
BALANCE at Dec. 31, 2023	7,875.0
Dividends declared	(256.1)	0.0	0.0	(256.1)	0.0
Fortrea Holdings Inc. spin-off	(1,732.0)	0.0	0.0	(1,970.0)	238.0
Common Stock, Value, Outstanding	7.7	7.7
Additional Paid in Capital	38.4		38.4
Retained Earnings	7,888.2			7,888.2
Accumulated Other Comprehensive Earnings (Loss)	(59.3)				(59.3)
Net earnings attributable to Labcorp Holdings Inc.	746.0	0.0	0.0	746.0	0.0
Other Comprehensive Income (Loss), Net of Tax	(202.3)	0.0	0.0	0.0	(202.3)
Issuance of common stock under employee stock plans	56.2	0.0	56.2	0.0	0.0
Net share settlement tax payments from issuance of stock to employees	46.4	0.0	46.4	0.0	0.0
Stock compensation	116.7	0.0	116.7	0.0	0.0
Purchase of common stock	(250.1)	(0.1)	(162.1)	(87.9)	0.0
BALANCE at Dec. 31, 2024	8,052.2
Dividends declared	(242.9)	0.0	0.0	(242.9)	0.0
Common Stock, Value, Outstanding	7.6	$ 7.6
Additional Paid in Capital	2.8		$ 2.8
Retained Earnings	8,303.4			$ 8,303.4
Accumulated Other Comprehensive Earnings (Loss)	$ (261.6)				$ (261.6)