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RESTRUCTURING RESERVES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Balance, beginning of period $ 79.2  
Restructuring charges 21.5  
Reduction of prior restructuring accruals (2.3)  
Cash payments and other adjustments (14.3)  
Balance, end of period 84.1  
Current   $ 50.9
Non-current   33.2
Total Restructuring Reserve 79.2 84.1
LabCorp Diagnostics [Member] | Severance and Other Employee Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance, beginning of period 0.1  
Restructuring charges 3.2  
Reduction of prior restructuring accruals 0.0  
Cash payments and other adjustments (2.0)  
Balance, end of period 1.3  
Total Restructuring Reserve 0.1 1.3
LabCorp Diagnostics [Member] | Lease and Other Facility Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance, beginning of period 26.5  
Restructuring charges 0.1  
Reduction of prior restructuring accruals (0.1)  
Cash payments and other adjustments (10.8)  
Balance, end of period 15.7  
Total Restructuring Reserve 26.5 15.7
Covance Drug Development [Member] | Severance and Other Employee Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance, beginning of period 51.5  
Restructuring charges 1.3  
Reduction of prior restructuring accruals 2.2  
Cash payments and other adjustments (8.6)  
Balance, end of period 42.0  
Total Restructuring Reserve 51.5 42.0
Covance Drug Development [Member] | Lease and Other Facility Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Balance, beginning of period 1.1  
Restructuring charges 16.9  
Reduction of prior restructuring accruals 0.0  
Cash payments and other adjustments (7.1)  
Balance, end of period 25.1  
Total Restructuring Reserve $ 1.1 $ 25.1