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RESTRUCTURING RESERVES (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Unused facility restructuring reserves $ 0.1 $ 0.2  
Balance, beginning of period 7.8    
Restructuring charges 19.3    
Cash payments and other adjustments (17.7)    
Balance, end of period 9.3    
Current     $ 6.3
Non-current     3.0
Total Restructuring Reserve 9.3   9.3
LabCorp Diagnostics [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Balance, beginning of period 0.3    
Restructuring charges 2.2    
Cash payments and other adjustments (2.4)    
Balance, end of period 0.0    
Total Restructuring Reserve 0.0   0.0
LabCorp Diagnostics [Member] | Lease and Other Facility Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Balance, beginning of period 0.4    
Restructuring charges 5.5    
Cash payments and other adjustments (5.3)    
Balance, end of period 0.5    
Total Restructuring Reserve 0.5   0.5
Covance Drug Development [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Balance, beginning of period 2.4    
Restructuring charges 2.0    
Cash payments and other adjustments (1.9)    
Balance, end of period 2.6    
Total Restructuring Reserve 2.6   2.6
Covance Drug Development [Member] | Lease and Other Facility Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Balance, beginning of period 4.7    
Restructuring charges 9.6    
Cash payments and other adjustments (8.1)    
Balance, end of period 6.2    
Total Restructuring Reserve $ 6.2   $ 6.2