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REVENUE Disaggregated Revenue Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss	$ 28.9		$ 19.0
Unbilled Services, Allowance for Credit Loss	2.4		2.3
Note Receivable, Allowance for Credit Loss	10.0		0.0
Allowance for Credit Loss	41.3		21.3
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings	7.0
Accounts Receivable, Credit Loss Expense (Reversal)	8.5
Unbilled Services, Credit Loss Expense (Reversal)	0.0
Note Receivable, Credit Loss Expense (Reversal)	5.0
Credit Loss Expense (Reversal)	13.5
Allowance for Credit Loss, Write Off	0.5
Increase Decrease in Operating Income Loss	$ (17.0)
Sales Commission Amortization Period Minimum	12 months
Deferred Revenue, Revenue Recognized	$ 121.8	$ 103.6
Contract with Customer, Asset, before Allowance for Credit Loss	480.6		483.7
Revenue, Remaining Performance Obligation, Amount	$ 4,494.9
Percent of remaining performance obligations recognized as revenue in next year	35.00%
Long Term Contracts Duration Minimum	1 year
Long Term Contracts Duration Maximum	8 years
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 9.7	39.7
Contract with Customer, Liability	430.9		449.2
Capitalized Contract Cost, Amortization	3.0	1.8
Accrued Sales Commission	30.3		28.6
Capitalized Contract Cost, Net	13.8		14.9
Amount of Deferred Costs Related to Long-term Contracts	44.1		43.5
Amortization of Deferred Sales Commissions	5.3	$ 4.5
Unbilled Contracts Receivable	$ 478.1		481.4
Percent of Revenue Contributed	100.00%	100.00%
Sales Commission Amortization Period Maximum	57 months
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	9.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	77.00%	78.00%
CANADA
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	3.00%	3.00%
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	5.00%	4.00%
SWITZERLAND
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	5.00%	5.00%
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	3.00%	3.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	7.00%
LabCorp Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	60.00%	62.00%
LabCorp Diagnostics [Member] \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	17.00%	17.00%
LabCorp Diagnostics [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	8.00%
LabCorp Diagnostics [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	28.00%	28.00%
LabCorp Diagnostics [Member] \| UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	57.00%	59.00%
LabCorp Diagnostics [Member] \| UNITED STATES \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	16.00%	16.00%
LabCorp Diagnostics [Member] \| UNITED STATES \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	8.00%
LabCorp Diagnostics [Member] \| UNITED STATES \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	8.00%	9.00%
LabCorp Diagnostics [Member] \| UNITED STATES \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	26.00%	26.00%
LabCorp Diagnostics [Member] \| CANADA
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	3.00%	3.00%
LabCorp Diagnostics [Member] \| CANADA \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	1.00%	1.00%
LabCorp Diagnostics [Member] \| CANADA \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| CANADA \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| CANADA \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	2.00%	2.00%
LabCorp Diagnostics [Member] \| UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| UNITED KINGDOM \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| UNITED KINGDOM \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| UNITED KINGDOM \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| UNITED KINGDOM \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| SWITZERLAND
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| SWITZERLAND \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| SWITZERLAND \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| SWITZERLAND \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| SWITZERLAND \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Client [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Europe [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Other countries [Member] \| Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
LabCorp Diagnostics [Member] \| Other countries [Member] \| Third party [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
Covance Drug Development [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 758.6		$ 771.1
Percent of Revenue Contributed	40.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	40.00%	38.00%
Covance Drug Development [Member] \| UNITED STATES \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	20.00%	19.00%
Covance Drug Development [Member] \| CANADA \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	0.00%	0.00%
Covance Drug Development [Member] \| UNITED KINGDOM \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	5.00%	4.00%
Covance Drug Development [Member] \| SWITZERLAND \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	5.00%	5.00%
Covance Drug Development [Member] \| Europe [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	3.00%	3.00%
Covance Drug Development [Member] \| Other countries [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	7.00%	7.00%
Minimum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	24 months
Maximum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	60 months
Notes Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings	$ 5.0
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	0.2
Allowance for Credit Loss, Write Off	0.1
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings	1.8
Allowance for Credit Loss, Write Off	$ 0.4