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COMMITMENTS AND CONTINGENT LIABILITIES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 72 Months Ended
Sep. 30, 2013
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Subpoenas
Aug. 24, 2012
Recipients
Jun. 30, 2011
Loss Contingencies [Line Items]                
Loss related to litigation settlement     $ 34.5us-gaap_GainLossRelatedToLitigationSettlement          
Previously recorded litigation reserve in connection with false claims act lawsuit     15.0lh_PreviouslyRecordedLitigationReserveInConnectionWithFalseClaimsActLawsuit          
Payment of legal settlement 49.5us-gaap_PaymentsForLegalSettlements              
Number of putative class actions     2lh_NumberOfPutativeClassActions          
Loss Contingency, Damages Awarded, Value     50.0us-gaap_LossContingencyDamagesAwardedValue          
Company's apportioned responsibility     50.00%lh_Companysapportionedresponsibility          
Co-defendant's apportioned responsibility     50.00%lh_Codefendantsapportionedresponsibility          
Loss Contingency Damages Awarded Gross   20.8lh_LossContingencyDamagesAwardedGross            
Reduction for Plaintiff Negligence   25.00%lh_ReductionforPlaintiffNegligence            
Loss Contingency Damages Awarded Net   15.8lh_LossContingencyDamagesAwardedNet            
Loss contingency reduced damages awarded gross   5.0lh_Losscontingencyreduceddamagesawardedgross            
Loss contingency reduced damages awarded net   4.4lh_Losscontingencyreduceddamagesawardednet            
Number of recipients             39lh_NumberOfRecipients  
Proposed damages per violation             0.0005lh_ProposedDamagesPerViolation  
Letters of credit     42.5lh_AmountOutstandingLettersOfCredit          
Future minimum rental commitments [Abstract]                
2013     109.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent          
2014     80.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears          
2015     58.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears          
2016     33.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears          
2017     15.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears          
Thereafter     37.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter          
Total minimum lease payments     335.8us-gaap_OperatingLeasesFutureMinimumPaymentsDue          
Less: amounts included in restructuring and acquisition related accruals     (5.2)lh_OperatingLeasesFutureMinimumPaymentsDueIncludedInRestructuringAndAcquisitionAccruals          
Less: non-cancelable sub-lease income     0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals          
Total minimum operating lease payments     330.6lh_OperatingLeasesFutureMinimumPaymentsDueLessRestructuringAcquisitionAccrualsAndFutureMinimumSubleaseRentals          
Rental expense     $ 239.2us-gaap_LeaseAndRentalExpense $ 235.7us-gaap_LeaseAndRentalExpense $ 226.0us-gaap_LeaseAndRentalExpense      
Medicaid Billing [Member]                
Loss Contingencies [Line Items]                
Number of subpoenas received           4lh_NumberOfSubpoenasReceived
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lh_MedicaidBillingMember
   
Tri State Clinical Laboratory Services LLC [Member]                
Loss Contingencies [Line Items]                
Ownership interest percentage, parent               50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lh_TriStateClinicalLaboratoryServicesLlcMember