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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Copper Commodity Forward Contracts    
Derivative [Line Items]    
Derivative, Notional Amount $ 62.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_CopperCommodityForwardContractsMember		 $ 45.3invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_CopperCommodityForwardContractsMember
Zinc Commodity Forward Contracts    
Derivative [Line Items]    
Derivative, Notional Amount 6.8invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_ZincCommodityForwardContractsMember		 4.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_ZincCommodityForwardContractsMember
Lead Commodity Forward Contracts    
Derivative [Line Items]    
Derivative, Notional Amount 14.1invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_LeadCommodityForwardContractsMember		 22.8invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_LeadCommodityForwardContractsMember
Natural Gas Commodity Forward Contracts    
Derivative [Line Items]    
Derivative, Notional Amount $ 5.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_NaturalGasCommodityForwardContractsMember		 $ 5.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= olin_NaturalGasCommodityForwardContractsMember