CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
BALANCE at Dec. 31, 2022	$ 10,096.6	$ 8.1	$ 0.0	$ 10,581.7	$ (493.2)
Net earnings attributable to Labcorp Holdings Inc.	212.9	0.0	0.0	212.9	0.0
Other comprehensive earnings, net of tax	49.0	0.0	0.0	0.0	49.0
Dividends	64.7	0.0	0.0	64.7	0.0
Issuance of common stock under employee stock plans	(27.6)	0.0	(27.6)	0.0	0.0
Surrender of restricted stock and performance share awards	(20.5)	0.0	(20.5)	0.0	0.0
Stock compensation	40.6	0.0	40.6	0.0	0.0
BALANCE at Mar. 31, 2023	10,341.5	8.1	47.7	10,729.9	(444.2)
BALANCE at Dec. 31, 2022	10,096.6	8.1	0.0	10,581.7	(493.2)
Net earnings attributable to Labcorp Holdings Inc.	585.1
Other comprehensive earnings, net of tax	46.4
BALANCE at Sep. 30, 2023	7,873.1	7.7	4.7	8,069.5	(208.8)
BALANCE at Mar. 31, 2023	10,341.5	8.1	47.7	10,729.9	(444.2)
Net earnings attributable to Labcorp Holdings Inc.	188.9	0.0	0.0	188.9	0.0
Other comprehensive earnings, net of tax	52.5	0.0	0.0	0.0	52.5
Dividends		0.0	0.0	64.5	0.0
Issuance of common stock under employee stock plans	(26.8)	0.0	(26.8)	0.0	0.0
Surrender of restricted stock and performance share awards	(18.2)	0.0	(18.2)	0.0	0.0
Stock compensation	38.1	0.0	38.1	0.0	0.0
BALANCE at Jun. 30, 2023	8,785.0	8.1	94.4	8,836.2	(153.7)
Stockholders' Equity Note, Spinoff Transaction	(1,780.1)	0.0	0.0	(2,018.1)	238.0
Dividends, Cash	(64.5)
Net earnings attributable to Labcorp Holdings Inc.	183.3	0.0	0.0	183.3	0.0
Other comprehensive earnings, net of tax	(55.1)	0.0	0.0	0.0	(55.1)
Dividends		0.0	0.0	64.6	0.0
Surrender of restricted stock and performance share awards	(0.9)	0.0	(0.9)	0.0	0.0
Stock compensation	34.4	0.0	34.4	0.0	0.0
BALANCE at Sep. 30, 2023	7,873.1	7.7	4.7	8,069.5	(208.8)
Dividends, Cash	(64.6)
Purchase of common stock	(1,009.0)	0.4	123.2	885.4	0.0
Retained Earnings (Accumulated Deficit)	7,888.2
BALANCE at Dec. 31, 2023	7,875.0	7.7	38.4	7,888.2	(59.3)
Net earnings attributable to Labcorp Holdings Inc.	228.0	0.0	0.0	228.0	0.0
Other comprehensive earnings, net of tax	(126.1)	0.0	0.0	0.0	(126.1)
Dividends	60.9	0.0	0.0	60.9	0.0
Issuance of common stock under employee stock plans	(26.7)	0.0	(26.7)	0.0	0.0
Surrender of restricted stock and performance share awards	(14.7)	0.0	(14.7)	0.0	0.0
Stock compensation	31.6	0.0	31.6	0.0	0.0
BALANCE at Mar. 31, 2024	7,959.6	7.7	82.0	8,055.3	(185.4)
BALANCE at Dec. 31, 2023	7,875.0	7.7	38.4	7,888.2	(59.3)
Net earnings attributable to Labcorp Holdings Inc.	602.6
Other comprehensive earnings, net of tax	(53.9)
BALANCE at Sep. 30, 2024	8,170.2	7.6	0.0	8,275.8	(113.2)
BALANCE at Mar. 31, 2024	7,959.6	7.7	82.0	8,055.3	(185.4)
Net earnings attributable to Labcorp Holdings Inc.	205.3	0.0	0.0	205.3	0.0
Other comprehensive earnings, net of tax	(6.6)	0.0	0.0	0.0	(6.6)
Dividends	60.2	0.0	0.0	60.2	0.0
Surrender of restricted stock and performance share awards	(23.1)	0.0	(23.1)	0.0	0.0
Stock compensation	30.8	0.0	30.8	0.0	0.0
BALANCE at Jun. 30, 2024	8,005.8	7.7	12.5	8,177.6	(192.0)
Purchase of common stock	(100.0)	0.0	77.2	22.8	0.0
Net earnings attributable to Labcorp Holdings Inc.	169.3	0.0	0.0	169.3	0.0
Other comprehensive earnings, net of tax	78.8	0.0	0.0	0.0	78.8
Dividends	61.1	0.0	0.0	61.1	0.0
Issuance of common stock under employee stock plans	(26.3)	0.0	(26.3)	0.0	0.0
Surrender of restricted stock and performance share awards	(0.9)	0.0	(0.9)	0.0	0.0
Stock compensation	27.0	0.0	27.0	0.0	0.0
BALANCE at Sep. 30, 2024	8,170.2	7.6	0.0	8,275.8	(113.2)
Purchase of common stock	(75.0)	$ 0.1	$ 64.9	$ 10.0	$ 0.0
Retained Earnings (Accumulated Deficit)	$ 8,275.8