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	8,785.0	8.1	94.4	8,836.2	(153.7)
BALANCE at Dec. 31, 2022	10,096.6	8.1	0.0	10,581.7	(493.2)
Net earnings attributable to Labcorp Holdings Inc.	401.8
Other comprehensive earnings, net of tax	101.5
BALANCE at Jun. 30, 2023	10,341.5	8.1	47.7	10,729.9	(444.2)
BALANCE at Mar. 31, 2023	8,785.0	8.1	94.4	8,836.2	(153.7)
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	10,341.5	8.1	47.7	10,729.9	(444.2)
Stockholders' Equity Note, Spinoff Transaction	(1,780.1)	0.0	0.0	(2,018.1)	238.0
Dividends, Cash	(64.5)
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.	433.3
Other comprehensive earnings, net of tax	(132.7)
BALANCE at Jun. 30, 2024	8,005.8	7.7	12.5	8,177.6	(192.0)
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
Retained Earnings (Accumulated Deficit)	$ 8,177.6