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OTHER ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Assets [Abstract] |  |  |
Supply contracts | $ 1,061.8 | $ 1,048.0 |
Other | 56.7 | 54.5 |
Other assets | 1,118.5 | 1,102.5 |
Long-term Other Supply Contract Payments | $ 64.5 | 37.7 | $ 0.0
Supply Contract Weighted-average Useful Life | 20 years |  |
Supply Contract Amortization | $ 71.2 | $ 70.4 | $ 69.4
Supply Contract Amortization Expense Next Twelve Months | 71.4 |  |
Supply Contract Amortization Expense, Year 2 | 71.4 |  |
Supply Contract Amortization Expense, Year 3 | 71.4 |  |
Supply Contract Amortization Expense, Year 4 | 69.8 |  |
Supply Contract Amortization Expense, Year 5 | $ 66.5 |  |

X
- Definition Amount of amortization recognized in connection with the Ethylene Supply Agreement. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Payments made under other long-term supply contracts. + References No definition available. + Details
Name: | oln_LongTermOtherSupplyContractPayments
Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The weighted-average useful life of long-term supply contracts entered into with third party suppliers. + References No definition available. + Details
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X
- Definition Amount of amortization expense for supply contracts during the next fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for supply contracts during the second year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of amortization expense for supply contracts during the third year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for supply contracts during the fourth year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for supply contracts during the fifth year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of other assets in connection with the Ethylene Supply Agreement and expected to be realized. + References No definition available. + Details
Name: | oln_SupplyContracts
Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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