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Document and Entity Information
Jun. 15, 2026
Document And Entity Information [Line Items]  
Entity Registrant Name OLIN Corp
Amendment Flag false
Entity Central Index Key 0000074303
Document Type 8-K
Document Period End Date Jun. 15, 2026
Entity File Number 1-1070
Entity Tax Identification Number 13-1872319
Entity Address, Address Line One 190 Carondelet Plaza
Entity Address, Address Line Two Suite 1530
Entity Address, City or Town Clayton
Entity Address, State or Province MO
Entity Address, Postal Zip Code 63105
City Area Code (314)
Local Phone Number 480-1400
Security 12b Title Common Stock, $1.00 par value per share
Trading Symbol OLN
Security Exchange Name NYSE
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
VA  
Document And Entity Information [Line Items]  
Entity Incorporation State Country Code VA