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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2026
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share Table |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Computation of Earnings (Loss) per Share | (In millions, except per share data)
Net (loss) income attributable to Olin Corporation | $ | (13.3) |  |  | $ | (1.3) |  |  | $ | (96.3) |  |  | $ | 0.1 |
Weighted-average common shares - basic | 113.9 |  |  | 114.9 |  |  | 113.8 |  |  | 115.1 |
Dilutive effect of stock-based compensation | — |  |  | — |  |  | — |  |  | 0.8 |
Weighted-average common shares - diluted | 113.9 |  |  | 114.9 |  |  | 113.8 |  |  | 115.9 |
Earnings (loss) per common share attributable to Olin Corporation: |  |  |  |  |  |  |
Basic | $ | (0.12) |  |  | $ | (0.01) |  |  | $ | (0.85) |  |  | $ | — |
Diluted | $ | (0.12) |  |  | $ | (0.01) |  |  | $ | (0.85) |  |  | $ | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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