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ACCOUNTS RECEIVABLES (Tables) | 3 Months Ended
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Mar. 31, 2024
Receivables [Abstract] |
AR Facilities | The following table summarizes the AR Facilities activity:
| Three Months Ended March 31,
| 2024 |  | 2023
AR Facilities | ($ in millions)
Balance at beginning of year | $ | 63.3 |  |  | $ | 111.8 |
Gross receivables sold | 176.6 |  |  | 252.3 |
Payments received from customers on sold accounts | (176.7) |  |  | (287.0) |
Balance at end of period | $ | 63.2 |  |  | $ | 77.1 |

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- Definition Tabular disclosure of activity under the accounts receivables factoring arrangements. + References No definition available. + Details
Name: | oln_ARFacilitiesTableTextBlock
Namespace Prefix: | oln_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

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