EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share Table

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Computation of Net Income per Share	(In millions, except per share data)
Net income	$	144.7	$	422.1	$	298.7	$	815.1
Net loss attributable to noncontrolling interests	(2.2)		—		(4.5)		—
Net income attributable to Olin Corporation	$	146.9	$	422.1	$	303.2	$	815.1
Basic shares	127.4		149.2		129.2		151.9
Basic net income attributable to Olin Corporation per share	$	1.15	$	2.83	$	2.35	$	5.37
Diluted shares:
Basic shares	127.4		149.2		129.2		151.9
Stock-based compensation	3.0		3.6		3.2		3.7
Diluted shares	130.4		152.8		132.4		155.6
Diluted net income attributable to Olin Corporation per share	$	1.13	$	2.76	$	2.29	$	5.24