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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share Table |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Computation of Earnings per Share | ($ in millions, except per share data)
Net (loss) income attributable to Olin Corporation | $ | (1.3) |  |  | $ | 74.2 |  |  | $ | 0.1 |  |  | $ | 122.8 |
Weighted-average common shares - basic | 114.9 |  |  | 118.5 |  |  | 115.1 |  |  | 119.1 |
Dilutive effect of stock-based compensation | — |  |  | 1.7 |  |  | 0.8 |  |  | 1.9 |
Weighted-average common shares - diluted | 114.9 |  |  | 120.2 |  |  | 115.9 |  |  | 121.0 |
Earnings (loss) per common share attributable to Olin Corporation: |  |  |  |  |  |  |
Basic | $ | (0.01) |  |  | $ | 0.63 |  |  | $ | — |  |  | $ | 1.03 |
Diluted | $ | (0.01) |  |  | $ | 0.62 |  |  | $ | — |  |  | $ | 1.01 |

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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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