Receivables, Loans, Notes Receivable, and Others (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Receivables [Abstract]

Accounts Receivable, Allowance for Credit Loss

	Accounts Receivable		Unbilled Services		Note and Other Receivables		Total
Allowance for credit losses as of December 31, 2020	$	22.1	$	11.3	$	5.7	$	39.1
Credit loss expense	3.8		2.7		(5.0)		1.5
Write offs	(4.4)		(0.1)		—		(4.5)
Allowance for credit losses as of December 31, 2021	$	21.5	$	13.9	$	0.7	$	36.1
Credit loss expense	15.1		—		—		15.1
Write offs	6.9		(3.4)		—		3.5
Ending allowance for credit losses as of December 31, 2022	$	43.5	$	10.5	$	0.7	$	54.7

Accounts, Notes, Loans and Financing Receivable [Line Items]

Accounts Receivable, Allowance for Credit Loss

$ (43.5)

$ (21.5)

$ (22.1)

Contract with Customer, Asset, before Allowance for Credit Loss

805.9

730.8

Allowance for Credit Loss, Receivable, Other, Current

(10.5)

(14.0)

Contract with Customer, Liability

582.1

558.5

LabCorp Diagnostics [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Accounts Receivable, before Allowance for Credit Loss

1,046.9

1,193.8

Covance Drug Development [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Accounts Receivable, before Allowance for Credit Loss

$ 1,218.6

$ 1,089.2