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STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation	$ 7.6	$ 8.3	$ 13.2	$ 12.8
Mark-to-market adjustments	(7.6)	(1.6)	(5.4)	(0.1)
Total expense	$ 0.0	$ 6.7	$ 7.8	$ 12.7

X

- Definition

Increase (decrease) to expense resulting from changes in the market value of underlying common stock in the liabilities associated with employee/director stock options, performance stock awards, restricted stock awards and deferred directors' compensation issued to employees and directors.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Total equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	oln_
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X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Period Type:	duration

X

- References

No definition available.

+ Details

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