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RESTRUCTURING RESERVES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]  
Balance, beginning of period $ 22.1us-gaap_RestructuringReserve
Restructuring charges 19.3us-gaap_RestructuringCharges
Reduction of prior restructuring accruals 0us-gaap_RestructuringReserveAccrualAdjustment
Cash payments and other adjustments (19.9)lh_RestructuringReserveSettledWithCashAndOtherAdjustment
Balance, end of period 21.5us-gaap_RestructuringReserve
Current 7.5us-gaap_RestructuringReserveCurrent
Non-current 14.0us-gaap_RestructuringReserveNoncurrent
Total Restructuring Reserve 21.5us-gaap_RestructuringReserve
Severance and Other Employee Costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Balance, beginning of period 0.4us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Restructuring charges 3.2us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Reduction of prior restructuring accruals 0us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Cash payments and other adjustments (2.9)lh_RestructuringReserveSettledWithCashAndOtherAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Balance, end of period 0.7us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Total Restructuring Reserve 0.7us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Lease and Other Facility Costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Balance, beginning of period 21.7us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Restructuring charges 16.1us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Reduction of prior restructuring accruals 0us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Cash payments and other adjustments (17.0)lh_RestructuringReserveSettledWithCashAndOtherAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Balance, end of period 20.8us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Total Restructuring Reserve $ 20.8us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember