EARNINGS PER SHARE (Tables)

12 Months Ended

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