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REVENUE Disaggregated Revenue Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss	$ 32.8		$ 32.8		$ 30.7
Unbilled Services, Allowance for Credit Loss	8.9		8.9		10.5
Note Receivable, Allowance for Credit Loss	0.7		0.7		0.7
Allowance for Credit Loss	42.4		42.4		41.9
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			6.2
Allowance for Credit Loss, Write Off			(5.7)
Deferred Revenue, Revenue Recognized	6.3	$ 9.3	79.1	$ 65.9
Contract with Customer, Asset, before Allowance for Credit Loss	116.9		116.9		222.3
Contract with Customer, Liability	360.8		360.8		310.6
Unbilled Contracts Receivable	$ 108.0		$ 108.0		211.8
Percent of Revenue Contributed	100.00%	100.00%	100.00%	100.00%
Revenues	$ 3,056.8	$ 2,866.8	$ 9,128.3	$ 8,934.2
Accounts Receivable, after Allowance for Credit Loss, Current	1,957.0		1,957.0		1,785.5
Allowance for Credit Loss, Receivable, Other, Current	(8.9)		(8.9)		(10.5)
Contract with Customer, Asset, after Allowance for Credit Loss, Current	$ 108.0		$ 108.0		211.8
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	9.00%	9.00%	9.00%
North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	87.00%	87.00%	87.00%	87.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	4.00%	4.00%	4.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	83.40%	83.50%	83.80%	83.40%
Revenues	$ 2,550.6	$ 2,392.4	$ 7,645.0	$ 7,454.0
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%	8.00%
LabCorp Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	77.00%	77.00%	77.00%	77.00%
LabCorp Diagnostics [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	77.00%	77.00%	77.00%	77.00%
LabCorp Diagnostics [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	24.00%	23.00%	24.00%	22.00%
LabCorp Diagnostics [Member] \| Client [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Client [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	24.00%	23.00%	24.00%	22.00%
LabCorp Diagnostics [Member] \| Client [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	8.00%	9.00%	8.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%	8.00%	9.00%	8.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Medicare and Medicaid [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Medicare and Medicaid [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	8.00%	8.00%	8.00%
LabCorp Diagnostics [Member] \| Medicare and Medicaid [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	36.00%	38.00%	36.00%	39.00%
LabCorp Diagnostics [Member] \| Third party [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
LabCorp Diagnostics [Member] \| Third party [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	36.00%	38.00%	36.00%	39.00%
LabCorp Diagnostics [Member] \| Third party [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%	0.00%	0.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed		23.00%		23.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed		9.00%		9.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed		10.00%		10.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed		4.00%		4.00%
Diagnostics
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	77.00%
Accounts Receivable, before Allowance for Credit Loss	$ 1,160.0		$ 1,160.0		1,046.9
Drug Development
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	23.00%
Accounts Receivable, before Allowance for Credit Loss	$ 829.8		$ 829.8		$ 769.3
Drug Development \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	23.00%		23.00%
Drug Development \| Biopharmaceutical and medical device companies [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	9.00%		9.00%
Drug Development \| Biopharmaceutical and medical device companies [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	10.00%		10.00%
Drug Development \| Biopharmaceutical and medical device companies [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%		4.00%
Notes Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			$ 0.0
Allowance for Credit Loss, Write Off			0.0
Unbilled Contracts Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			0.0
Allowance for Credit Loss, Write Off			(1.6)
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			6.2
Allowance for Credit Loss, Write Off			$ (4.1)