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OTHER ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Other Assets [Abstract] |  |  |
Supply contracts | $ 1,065.1 | $ 1,045.4 | $ 1,061.8
Other | 58.4 | 59.3 | 56.7
Other assets | 1,123.5 | 1,104.7 | $ 1,118.5
Payments under other long-term supply contracts | 28.5 | 9.3 |
Amortization of Supply Contracts | $ 18.3 | $ 17.6 |

X
- Definition Amount of amortization recognized in connection with the various long-term supply contracts. + References No definition available. + Details
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Namespace Prefix: | oln_
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Balance Type: | debit
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X
- Definition Long-term Other Supply Contract Payments + References No definition available. + Details
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Namespace Prefix: | oln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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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