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PENSION PLANS (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of Net Periodic Benefit Income [Abstract]      
Service cost $ 5.3olin_ComponentsOfNetPeriodicBenefitIncomeServiceCost $ 6.2olin_ComponentsOfNetPeriodicBenefitIncomeServiceCost $ 6.1olin_ComponentsOfNetPeriodicBenefitIncomeServiceCost
Interest cost 86.5us-gaap_DefinedBenefitPlanInterestCost 81.1us-gaap_DefinedBenefitPlanInterestCost 92.0us-gaap_DefinedBenefitPlanInterestCost
Expected return on plans' assets (139.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (137.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (139.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of prior service cost 2.2us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 1.9us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 2.2us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Recognized actuarial loss 20.3us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 27.8us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 18.1us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Curtailments 0.2us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1
Net periodic benefit income (cost) (25.0)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost (20.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost (21.1)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Included in Other Comprehensive Loss (Pretax) [Abstract]      
Liability adjustment 138.9us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 14.4us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 162.0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Amortization of prior service costs and actuarial losses $ (22.7)olin_OthercompreshensiveincomelossreclassificationadjustmentfromAOCIpension $ (29.7)olin_OthercompreshensiveincomelossreclassificationadjustmentfromAOCIpension $ (20.3)olin_OthercompreshensiveincomelossreclassificationadjustmentfromAOCIpension