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v3.26.1

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Earnings Per Share [Abstract] |  |  |  |
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 | 0.0 | 0.0 | 0.0 | 0.8
Weighted-average common shares - diluted | 113.9 | 114.9 | 113.8 | 115.9
Basic | $ (0.12) | $ (0.01) | $ (0.85) | $ 0
Diluted | $ (0.12) | $ (0.01) | $ (0.85) | $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Shares | 3.7 | 5.7 | 3.7 | 4.0

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