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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

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, 2019	$	19.0	$	2.3	$	—	$	21.3
Current expected credit losses opening balance impact on retained earnings	1.8		0.2		5.0		7.0
Credit loss expense	7.0		9.0		0.7		16.7
Write offs	(5.7)		(0.2)		—		(5.9)
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)
Ending allowance for credit losses	$	21.5	$	13.9	$	0.7	$	36.1

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

Accounts Receivable, Allowance for Credit Loss

$ (21.5)

$ (22.1)

$ (19.0)

LabCorp Diagnostics [Member]

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

Accounts Receivable, before Allowance for Credit Loss

1,193.8

1,515.5

Covance Drug Development [Member]

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

Accounts Receivable, before Allowance for Credit Loss

$ 1,089.2

$ 986.4