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, 2021	$ 10,273.4	$ 8.5	$ 0.0	$ 10,456.8	$ (191.9)
Net earnings attributable to Laboratory Corporation of America Holdings	491.6	0.0	0.0	491.6	0.0
Other comprehensive earnings, net of tax	(73.0)	0.0	0.0	0.0	(73.0)
Issuance of common stock under employee stock plans	(18.2)	0.0	(18.2)	0.0	0.0
Surrender of restricted stock and performance share awards	(27.3)	0.0	(27.3)	0.0	0.0
Stock compensation	38.2	0.0	38.2	0.0	0.0
BALANCE at Mar. 31, 2022	10,721.1	8.5	29.1	10,948.4	(264.9)
Retained Earnings (Accumulated Deficit)	10,581.7
BALANCE at Dec. 31, 2022	10,096.6	8.1	0.0	10,581.7	(493.2)
Net earnings attributable to Laboratory Corporation of America Holdings	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)
Retained Earnings (Accumulated Deficit)	$ 10,729.9