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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity Note [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ 0.1us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 10.1us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Common shares issued and outstanding [Abstract]        
Common shares issued 107.1us-gaap_CommonStockSharesIssued 108.1us-gaap_CommonStockSharesIssued 115.8us-gaap_CommonStockSharesIssued  
In treasury (22.5)us-gaap_TreasuryStockNumberOfSharesHeld (22.4)us-gaap_TreasuryStockNumberOfSharesHeld (22.3)us-gaap_TreasuryStockNumberOfSharesHeld  
Outstanding 84.6us-gaap_CommonStockSharesOutstanding 85.7us-gaap_CommonStockSharesOutstanding    
Common stock, shares authorized (in shares) 265.0us-gaap_CommonStockSharesAuthorized      
Common stock, par value per share (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare      
Preferred stock, shares authorized (in shares) 30.0us-gaap_PreferredStockSharesAuthorized      
Preferred stock, par value per share (in dollars per share) $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare      
Rollforward of common shares issued [Abstract]        
Common shares issued, beginning balance (in shares) 108.1us-gaap_CommonStockSharesIssued 115.8us-gaap_CommonStockSharesIssued 120.0us-gaap_CommonStockSharesIssued  
Common stock issued under employee stock plans (in shares) 1.6lh_CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans 2.6lh_CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans 1.6lh_CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans  
Common stock issued upon conversion of zero-coupon subordinated notes (in shares) 0.1us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 0.1us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 0us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities  
Common shares repurchased (in shares) (2.7)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (10.4)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (5.8)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares  
Common shares issued, ending balance (in shares) 107.1us-gaap_CommonStockSharesIssued 108.1us-gaap_CommonStockSharesIssued 115.8us-gaap_CommonStockSharesIssued  
Rollforward of common shares held in treasury [Abstract]        
Common shares held in treasury, beginning balance 22.4us-gaap_TreasuryStockNumberOfSharesHeld 22.3us-gaap_TreasuryStockNumberOfSharesHeld 22.2us-gaap_TreasuryStockNumberOfSharesHeld  
Surrender of restricted stock and performance share awards 0.1us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited 0.1us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited 0.1us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited  
Common shares held in treasury, ending balance 22.5us-gaap_TreasuryStockNumberOfSharesHeld 22.4us-gaap_TreasuryStockNumberOfSharesHeld 22.3us-gaap_TreasuryStockNumberOfSharesHeld  
Share repurchase program [Abstract]        
Purchase of common stock (Shares) 2.7us-gaap_StockRepurchasedDuringPeriodShares      
Purchase of common stock (269.0)us-gaap_StockRepurchasedDuringPeriodValue (1,015.6)us-gaap_StockRepurchasedDuringPeriodValue (516.5)us-gaap_StockRepurchasedDuringPeriodValue  
Outstanding common stock repurchase authorization 789.5lh_CommonStockRepurchaseAuthorizationOutstanding      
Foreign Currency Translation Adjustments        
Foreign Currency Translation Adjustments, balance 123.2us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 162.9us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 143.5us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Current year adjustments, Foreign Currency Translation Adjustments (89.5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (63.2)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 31.3us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax  
Tax effect of adjustments, Foreign Currency Translation Adjustments 34.3us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax 23.5us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax (11.9)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax  
Foreign Currency Translation Adjustments, balance 68.0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 123.2us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 162.9us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax (12.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax 31.6us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax (4.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax  
Net Benefit Plan Adjustments        
Net Benefit Plan Adjustments, balance (67.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (93.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (98.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Tax effect of adjustments, Net Benefit Plan Adjustments 7.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (15.7)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (2.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax  
Net Benefit Plan Adjustments, balance (78.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (67.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (93.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 6.3us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (6.3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax (16.3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 16.4us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax  
Other Comprehensive Income (Loss), before Reclassifications, before Tax (99.5)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax (15.2)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax 26.5us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax  
Accumulated Other Comprehensive Earnings        
Accumulated Other Comprehensive Earnings, balance 10.5us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (66.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (69.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (45.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Tax effect of adjustments, Accumulated Other Comprehensive Earnings 47.7us-gaap_OtherComprehensiveIncomeLossTax 1.5us-gaap_OtherComprehensiveIncomeLossTax (14.7)us-gaap_OtherComprehensiveIncomeLossTax  
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax  
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax (6.6)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 10.5us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 12.1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax (18.3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (24.9)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax 10.5us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax 12.1us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax $ 2.0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax