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INCOME TAXES (Details 1)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Contingency [Line Items]    
Statutory federal tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign rate differential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Domestic manufacturing/export tax incentive (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Dividends paid to CEOP (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Change in valuation allowance 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
State income taxes, net 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Remeasurement of deferred taxes 0.00%olin_EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxesPercent (0.30%)olin_EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxesPercent
Other, net 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 33.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations