Restructuring and Related Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Number of years restructuring liabilities expected to be paid out over	10 years 8 months 12 days
Net restructuring charges	$ 83.8	$ 43.1	$ 40.6
Restructuring charges related to severance and other employee costs	39.3	16.3	14.1
Restructuring Costs and Asset Impairment Charges	45.7		17.4
Employee Severance Benefits Related Restructuring Reserve Accrual Adjustment	0.3	0.4	0.6
Facility Related Restructuring Reserve Accrual Adjustment	0.9	0.8	9.2
Restructuring charges related to contractual obligations associated with leased facilities and other facility related costs		28.0	18.9
Restructuring Reserve	18.4	8.4	7.8
Restructuring Reserve, Current	7.7
Restructuring Reserve, Noncurrent	10.7
Restructuring Charges	85.0	44.3
Restructuring Reserve, Accrual Adjustment	(1.2)	(1.2)
Payments for Restructuring	(73.8)	(42.5)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	18.4	8.4	7.8
Net restructuring charges	83.8	43.1	40.6
Restructuring charges related to severance and other employee costs	39.3	16.3	14.1
Restructuring Costs and Asset Impairment Charges	45.7		17.4
Restructuring Reserve, Accrual Adjustment	(1.2)	(1.2)
Payments for Restructuring	73.8	42.5
Restructuring Charges	85.0	44.3
Employee Severance [Member] | LabCorp Diagnostics [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	4.0	4.3	2.7
Restructuring Charges	39.3	16.3
Restructuring Reserve, Accrual Adjustment	(0.3)	(0.4)
Payments for Restructuring	39.3	14.3
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4.0	4.3	2.7
Restructuring Reserve, Accrual Adjustment	(0.3)	(0.4)
Payments for Restructuring	(39.3)	(14.3)
Restructuring Charges	39.3	16.3
Facility Closing [Member] | LabCorp Diagnostics [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	14.4	4.1	5.1
Restructuring Charges	45.7	28.0
Restructuring Reserve, Accrual Adjustment	(0.9)	(0.8)
Payments for Restructuring	34.5	28.2
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	14.4	4.1	$ 5.1
Restructuring Reserve, Accrual Adjustment	(0.9)	(0.8)
Payments for Restructuring	(34.5)	(28.2)
Restructuring Charges	$ 45.7	$ 28.0