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PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Weighted Average Useful Life of Machinery and Equipment 10olin_WeightedAverageUsefulLifeOfMachineryAndEquipment    
Depreciation expense $ 124.5us-gaap_Depreciation $ 120.7us-gaap_Depreciation $ 104.4us-gaap_Depreciation
Interest capitalized 0.2us-gaap_InterestCostsIncurredCapitalized 1.1us-gaap_InterestCostsIncurredCapitalized 7.4us-gaap_InterestCostsIncurredCapitalized
Maintenance and repairs 125.0us-gaap_CostOfPropertyRepairsAndMaintenance 134.7us-gaap_CostOfPropertyRepairsAndMaintenance 124.4us-gaap_CostOfPropertyRepairsAndMaintenance
(Decrease) Increase in Capital Expenditures Incurred but Not Yet Paid (0.5)olin_IncreaseDecreaseinCapitalExpendituresIncurredbutNotYetPaid 7.9olin_IncreaseDecreaseinCapitalExpendituresIncurredbutNotYetPaid 17.4olin_IncreaseDecreaseinCapitalExpendituresIncurredbutNotYetPaid
Sale Leaseback Transaction, Gross Proceeds 0us-gaap_SaleLeasebackTransactionGrossProceeds 35.8us-gaap_SaleLeasebackTransactionGrossProceeds 4.4us-gaap_SaleLeasebackTransactionGrossProceeds
Capital Leased Assets, Gross $ 0us-gaap_CapitalLeasedAssetsGross $ 4.2us-gaap_CapitalLeasedAssetsGross