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INCOME TAXES (Details 2)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Tax Rate Reconciliation (Percent)      
Statutory federal tax rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign rate differential (in hundredths) (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Domestic manufacturing/export tax incentive (in hundredths) (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Return to provision (in hundredths) (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Dividends paid to CEOP (in hundredths) (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Change in tax contingencies (in hundredths) (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (3.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
State income taxes, net (in hundredths) 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance (in hundredths) 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Remeasurement of deferred taxes (in hundredths) 0.40%olin_EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxes 0.10%olin_EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxes 0.70%olin_EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxes
Research tax credit (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Section 45O tax credit (in hundredths) 0.00%olin_Effectiveincometaxratereconciliationsection45Ocredit 0.00%olin_Effectiveincometaxratereconciliationsection45Ocredit (3.00%)olin_Effectiveincometaxratereconciliationsection45Ocredit
Australia dividend residual tax expense (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Other, net (in hundredths) 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (in hundredths) 35.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 28.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations