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

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

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, 2021	$	9.8	$	13.9	$	0.7	$	24.4
Credit loss expense	11.7		—		—		11.7
Write offs	9.3		(3.4)		—		5.9
Allowance for credit losses as of December 31, 2022	$	30.8	$	10.5	$	0.7	$	42.0
Credit loss expense	6.3		—		—		6.3
Write offs	(4.4)		(3.0)		—		(7.4)
Ending allowance for credit losses as of December 31, 2023	$	32.7	$	7.5	$	0.7	$	40.9

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

Accounts Receivable, Allowance for Credit Loss

$ (32.7)

$ (30.8)

$ (9.8)

Contract with Customer, Asset, before Allowance for Credit Loss

192.9

222.3

Allowance for Credit Loss, Receivable, Other, Current

(7.5)

(10.6)

Contract with Customer, Liability

421.7

310.6

LabCorp Diagnostics [Member]

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

Accounts Receivable, before Allowance for Credit Loss

1,135.2

1,046.9

Covance Drug Development [Member]

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

Accounts Receivable, before Allowance for Credit Loss

$ 810.8

$ 769.4