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Note Receivable, Allowance for Credit Loss

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Percent of Revenue Contributed

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

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- Details

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REVENUE Disaggregated Revenue Table (Details) - USD ($)	3 Months Ended		6 Months Ended
REVENUE Disaggregated Revenue Table (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss	$ 20,900,000		$ 20,900,000		$ 22,100,000
Unbilled Services, Allowance for Credit Loss	11,400,000		11,400,000		11,300,000
Note Receivable, Allowance for Credit Loss	5,700,000		5,700,000		5,700,000
Allowance for Credit Loss	$ 38,000,000.0		38,000,000.0		39,100,000
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			(400,000)
Allowance for Credit Loss, Write Off			700,000
Sales Commission Amortization Period Minimum	1 year
Deferred Revenue, Revenue Recognized			233,000,000.0	$ 102,200,000
Contract with Customer, Asset, before Allowance for Credit Loss	$ 648,400,000		648,400,000		548,100,000
Revenue, Remaining Performance Obligation, Amount	$ 5,616,600,000		5,616,600,000
Long Term Contracts Duration Minimum	1 year
Long Term Contracts Duration Maximum	8 years
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 12,200,000	$ 4,000,000.0	28,700,000	13,700,000
Contract with Customer, Liability	529,600,000		529,600,000		492,200,000
Capitalized Contract Cost, Amortization	3,000,000.0	2,300,000	6,500,000	5,300,000
Accrued Sales Commission	36,400,000		36,400,000		32,600,000
Capitalized Contract Cost, Net	14,900,000		14,900,000		12,600,000
Amount of Deferred Costs Related to Long-term Contracts	51,300,000		51,300,000		45,200,000
Amortization of Deferred Sales Commissions	6,400,000	$ 5,500,000	13,300,000	$ 10,800,000
Unbilled Contracts Receivable	$ 637,000,000.0		$ 637,000,000.0		536,800,000
Percent of Revenue Contributed	100.00%	100.00%	100.00%	100.00%
Sales Commission Amortization Period Maximum	5 years
Revenues	$ 3,840,700,000	$ 2,768,800,000	$ 8,002,200,000	$ 5,592,600,000
Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	12.00%	12.00%	11.00%	13.00%
North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	84.00%	79.00%	85.00%	79.00%
Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	9.00%	4.00%	8.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	80.50%	76.90%	81.70%	76.80%
Revenues	$ 3,091,300,000	$ 2,129,000,000.0	$ 6,537,400,000	$ 4,294,200,000
Medicare and Medicaid [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	6.00%	7.00%	6.00%	7.00%
LabCorp Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	61.00%	61.00%	63.00%	60.00%
Revenues	$ 2,365,500,000	$ 1,692,700,000	$ 5,123,300,000	$ 3,394,700,000
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	61.00%	61.00%	63.00%	60.00%
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	17.00%	21.00%	18.00%	19.00%
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	17.00%	21.00%	18.00%	19.00%
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	7.00%	7.00%	6.00%	7.00%
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	7.00%	7.00%	6.00%	7.00%
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	6.00%	7.00%	6.00%	7.00%
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	31.00%	26.00%	33.00%	27.00%
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	31.00%	26.00%	33.00%	27.00%
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]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	$ 1,086,200,000		$ 1,086,200,000		$ 1,001,500,000
Percent of Revenue Contributed			37.00%
Revenues	$ 1,495,200,000	$ 1,093,700,000	$ 2,933,400,000	$ 2,237,500,000
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	39.00%	39.00%	37.00%	40.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	12.00%	12.00%	11.00%	13.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| North America
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	23.00%	18.00%	22.00%	19.00%
Covance Drug Development [Member] \| Biopharmaceutical and medical device companies [Member] \| Other countries [Member]
Disaggregation of Revenue [Line Items]
Percent of Revenue Contributed	4.00%	9.00%	4.00%	8.00%
Minimum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	2 years		2 years
Maximum [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Amortization Period	5 years		5 years
Notes Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			$ 0
Allowance for Credit Loss, Write Off			0
Unbilled Contracts Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			0
Allowance for Credit Loss, Write Off			(100,000)
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Current Expected Credit Losses Opening Balance Sheet Impact on Retained Earnings			(400,000)
Allowance for Credit Loss, Write Off			$ 800,000