Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Sales	$ 1,635.3	$ 1,844.3
Operating expenses:
Cost of goods sold	1,428.0	1,441.7
Selling and administrative	101.9	111.8
Restructuring charges	8.3	60.9
Other operating income	0.2	0.5
Operating income	97.3	230.4
Interest expense	44.6	42.4
Interest income	0.8	1.1
Non-operating pension income	6.8	5.7
Income before taxes	60.3	194.8
Income tax provision	12.5	40.8
Net income	47.8	154.0
Net loss attributable to noncontrolling interests	(0.8)	(2.3)
Net income attributable to Olin Corporation	$ 48.6	$ 156.3
Net income attributable to Olin Corporation per common share:
Basic	$ 0.41	$ 1.19
Diluted	$ 0.40	$ 1.16
Average common shares outstanding:
Basic	119.9	131.0
Diluted	121.9	134.4