Condensed Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2022		$ 132.3	$ 682.7	$ (495.9)	$ 2,224.5
Common stock repurchased and retired	$ (206.1)	(3.6)	(202.5)		0.0
Stock Issued During Period, Value, Stock Options Exercised	11.2	0.4	10.8
Common stock issued for other transactions		0.2	1.4
Stock-based compensation			(0.8)
Other comprehensive income	13.2			13.2
Net income	154.0
Common stock dividends paid					(26.2)
Balance at end of period at Mar. 31, 2023	2,492.8	$ 129.3	491.6	(482.7)	2,354.6
Net income attributable to Olin Corporation	156.3				156.3
Balance at beginning of period at Dec. 31, 2022						$ 0.0
Net loss attributable to noncontrolling interests	(2.3)					(2.3)
Contributions received from noncontrolling interests	44.1					44.1
Balance at end of period at Mar. 31, 2023	41.8					41.8
Dividends declared per share of common stock		$ 0.20
Total equity	2,534.6
Total equity	2,268.3
Balance at beginning of period at Dec. 31, 2023	2,232.4	$ 120.2	24.8	(496.3)	2,583.7
Common stock repurchased and retired	(105.4)	(2.0)	(37.3)		(66.1)
Stock Issued During Period, Value, Stock Options Exercised	19.8	0.8	19.0
Common stock issued for other transactions		0.4	(4.3)
Stock-based compensation			(2.2)
Other comprehensive income	6.6			6.6
Net income	47.8
Common stock dividends paid					(23.9)
Balance at end of period at Mar. 31, 2024	2,172.0	$ 119.4	$ 0.0	$ (489.7)	2,542.3
Net income attributable to Olin Corporation	48.6				$ 48.6
Balance at beginning of period at Dec. 31, 2023	35.9					35.9
Net loss attributable to noncontrolling interests	(0.8)					(0.8)
Contributions received from noncontrolling interests	0.0					0.0
Balance at end of period at Mar. 31, 2024	35.1					$ 35.1
Dividends declared per share of common stock		$ 0.20
Total equity	$ 2,207.1