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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share Table |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Computation of Earnings per Share | (In millions, except per share data)
Net income (loss) attributable to Olin Corporation | $ | 42.8 |  |  | $ | (24.9) |  |  | $ | 42.9 |  |  | $ | 97.9 |
Weighted-average common shares - basic | 114.4 |  |  | 116.9 |  |  | 114.9 |  |  | 118.4 |
Dilutive effect of stock-based compensation | 0.7 |  |  | — |  |  | 0.7 |  |  | 1.8 |
Weighted-average common shares - diluted | 115.1 |  |  | 116.9 |  |  | 115.6 |  |  | 120.2 |
Earnings (loss) per common share attributable to Olin Corporation: |  |  |  |  |  |  |
Basic | $ | 0.37 |  |  | $ | (0.21) |  |  | $ | 0.37 |  |  | $ | 0.83 |
Diluted | $ | 0.37 |  |  | $ | (0.21) |  |  | $ | 0.37 |  |  | $ | 0.81 |

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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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