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INCOME TAXES (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Valuation Allowance [Abstract] |  |
Beginning balance | $ 76.4 | $ 70.1
Increases to valuation allowances | 23.6 | 14.6
Decreases to valuation allowances | (0.1) | (6.6)
Foreign currency translation adjustments | (0.4) | (1.7)
Ending balance | $ 99.5 | $ 76.4

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- Definition The change in deferred income tax valuation allowance due to the amount charged to the income tax provision during the period. + References No definition available. + Details
Name: | oln_Amountchargedtoincometaxprovision
Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The change in deferred income tax valuation allowance due to the amount credited to the income tax provision (i.e. deduction from reserve) during the period. + References No definition available. + Details
Name: | oln_Amountscreditedtoincometaxprovision
Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The currency translation adjustment impact on the valuation allowance. + References No definition available. + Details
Name: | oln_ValuationAllowanceCurrencyTranslationAdjustment
Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration