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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share Table |
| Years ended December 31,
| 2023 |  | 2022 |  | 2021
Computation of Net Income per Share | (In millions, except per share data)
Net income | $ | 452.0 |  |  | $ | 1,326.9 |  |  | $ | 1,296.7 |
Net loss attributable to noncontrolling interests | (8.2) |  |  | — |  |  | — |
Net income attributable to Olin Corporation | 460.2 |  |  | 1,326.9 |  |  | 1,296.7 |
Basic shares | 125.9 |  |  | 144.9 |  |  | 159.1 |
Basic net income attributable to Olin Corporation per share | $ | 3.66 |  |  | $ | 9.16 |  |  | $ | 8.15 |
Diluted shares: |  |  |  |  |
Basic shares | 125.9 |  |  | 144.9 |  |  | 159.1 |
Stock-based compensation | 2.9 |  |  | 3.6 |  |  | 3.9 |
Diluted shares | 128.8 |  |  | 148.5 |  |  | 163.0 |
Diluted net income attributable to Olin Corporation per share | $ | 3.57 |  |  | $ | 8.94 |  |  | $ | 7.96 |

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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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