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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 3,099.4us-gaap_Goodwill $ 3,022.8us-gaap_Goodwill
Adjustments to goodwill (5.2)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments (5.9)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Goodwill, Acquired During Period 81.8us-gaap_GoodwillAcquiredDuringPeriod 127.0us-gaap_GoodwillAcquiredDuringPeriod
Goodwill [Roll Forward]    
Balance as of January 1 3,022.8us-gaap_Goodwill 2,901.7us-gaap_Goodwill
Adjustments to goodwill (5.2)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments (5.9)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Goodwill, net 3,099.4us-gaap_Goodwill 3,022.8us-gaap_Goodwill
Clinical diagnostics laboratory [Member]    
Goodwill [Line Items]    
Goodwill 3,042.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
2,960.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Adjustments to goodwill 0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
(4.4)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Goodwill, Acquired During Period 81.8us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
107.5us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Goodwill [Roll Forward]    
Balance as of January 1 2,960.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
2,857.1us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Adjustments to goodwill 0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
(4.4)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Goodwill, net 3,042.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
2,960.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lh_ClinicaldiagnosticslaboratoryMember
Other Segments [Member]    
Goodwill [Line Items]    
Goodwill 57.4us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
62.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Adjustments to goodwill (5.2)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
(1.5)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Goodwill, Acquired During Period 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
19.5us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Goodwill [Roll Forward]    
Balance as of January 1 62.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
44.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Adjustments to goodwill (5.2)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
(1.5)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Goodwill, net $ 57.4us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
$ 62.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember