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RESTRUCTURING RESERVES (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve $ 7,800,000 $ 13,400,000 $ 43,600,000
Reclass for Adoption of ASC 842   (32,800,000)  
Restructuring Reserve, Current 5,700,000    
Restructuring Reserve, Noncurrent 2,100,000    
Employee Severance Benefits Related Restructuring Reserve Accrual Adjustment $ 600,000 1,700,000 2,000,000.0
Number of years restructuring liabilities expected to be paid out over 4 years 10 months 24 days    
Facility Related Restructuring Reserve Accrual Adjustment $ 9,200,000 1,500,000 2,000,000.0
Restructuring Charges (33,000,000.0) (33,100,000)  
Restructuring Costs and Asset Impairment Charges 17,400,000 24,700,000  
Restructuring Reserve, Accrual Adjustment (9,800,000) (3,200,000)  
Restructuring Reserve Settled With Cash And Other Adjustment (46,200,000) (52,000,000.0)  
LabCorp Diagnostics [Member] | Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 300,000 500,000 2,100,000
Reclass for Adoption of ASC 842   0  
Restructuring Charges (5,200,000) (17,300,000)  
Restructuring Costs and Asset Impairment Charges 0 0  
Restructuring Reserve, Accrual Adjustment (100,000) (200,000)  
Restructuring Reserve Settled With Cash And Other Adjustment (5,300,000) (18,700,000)  
LabCorp Diagnostics [Member] | Facility Closing [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 400,000 2,700,000 7,400,000
Reclass for Adoption of ASC 842   (5,700,000)  
Restructuring Charges (5,500,000) (1,800,000)  
Restructuring Costs and Asset Impairment Charges 7,500,000 11,800,000  
Restructuring Reserve, Accrual Adjustment (2,800,000) (400,000)  
Restructuring Reserve Settled With Cash And Other Adjustment (12,500,000) (8,600,000)  
Covance Drug Development [Member] | Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 2,400,000 5,500,000 6,500,000
Reclass for Adoption of ASC 842   0  
Restructuring Charges (8,900,000) (15,600,000)  
Restructuring Costs and Asset Impairment Charges 0 0  
Restructuring Reserve, Accrual Adjustment 500,000 1,500,000  
Restructuring Reserve Settled With Cash And Other Adjustment (11,500,000) (15,100,000)  
Covance Drug Development [Member] | Facility Closing [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 4,700,000 4,700,000 $ 27,600,000
Reclass for Adoption of ASC 842   (27,100,000)  
Restructuring Charges (13,400,000) (2,000,000.0)  
Restructuring Costs and Asset Impairment Charges 9,900,000 12,900,000  
Restructuring Reserve, Accrual Adjustment 6,400,000 1,100,000  
Restructuring Reserve Settled With Cash And Other Adjustment $ (16,900,000) $ (9,600,000)