Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Sales	$ 1,844.3	$ 2,461.4
Operating expenses:
Cost of goods sold	1,441.7	1,807.5
Selling and administration	111.8	104.3
Restructuring charges	60.9	3.1
Other operating income	0.5	0.0
Operating income	230.4	546.5
Interest expense	42.4	32.9
Interest income	1.1	0.4
Non-operating pension income	(5.7)	(9.6)
Income before taxes	194.8	523.6
Income tax provision	40.8	130.6
Net income	154.0	393.0
Net loss attributable to noncontrolling interests	(2.3)	0.0
Net income attributable to Olin Corporation	$ 156.3	$ 393.0
Net income attributable to Olin Corporation per common share:
Basic	$ 1.19	$ 2.54
Diluted	$ 1.16	$ 2.48
Average common shares outstanding:
Basic	131.0	154.7
Diluted	134.4	158.6