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STOCK-BASED COMPENSATION (Details 2) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Share Award, Total Shareholder Return Percent	50.00%
Performance Share Award Cycle	3
Performance Share Award, Net Income Percent	50.00%
Black-Sholes Option-Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.50%	1.32%
Risk-free interest rate	4.35%	4.07%
Expected volatility of Olin common stock	47.00%	47.00%
Expected life (years)	7 years	7 years
Weighted-average grant fair value (per option)	$ 24.79	$ 28.74
Weighted-average exercise price	$ 53.43	$ 60.55
Stock options granted	601,157	562,124
Monte Carlo Simulation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.53%	4.46%
Expected volatility of Olin common stock	41.00%	52.00%
Expected life (years)	3 years	3 years
Expected average volatility of peer companies	0.37	0.42
Average correlation coefficient of peer companies	0.40	0.51
Grant date fair value (TSR-based award)	$ 72.80	$ 86.98
Grant date fair value (net income-based award)	$ 54.07	$ 60.55
Performance share awards granted	180,714	161,474

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Share Based Compensation Arrangements Expected Volatility Rate of Peer Companies

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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