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STOCK-BASED COMPENSATION (Detail Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option and long-term incentive plans, exercisable period (in years) 10 years 0 months 0 days    
Stock options, restricted stock and performance shares vesting period (in years) 3 years 0 months 0 days    
Average exercise period for outstanding options (in months) 0 years 67 months 0 days    
Average exercise period for exercisable options (in months) 0 years 54 months 0 days    
Aggregate intrinsic value for outstanding options $ 13.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Aggregate intrinsic value for exercisable options 13.6us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Total intrinsic value of options exercised 3.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 4.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Total unrecognized compensation, unvested 5.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Total unrecognized compensation, unvested, weighted average recognition period (in years) 0 years 18 months 0 days    
Performance share award cycle (in years) 3olin_PerformanceShareAwardCycle    
Liability recorded for performance shares to be settled in cash 4.7us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation, unvested $ 4.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_PerformanceSharesMember
   
Total unrecognized compensation, unvested, weighted average recognition period (in years) 0 years 14 months 0 days