Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 144.7	$ 422.1	$ 298.7	$ 815.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(8.5)	(26.0)	(3.0)	(36.5)
Unrealized losses (gains) on derivative contracts, net	7.4	(55.0)	14.8	(24.3)
Amortization of prior service costs and actuarial losses, net	0.4	6.7	0.7	13.3
Total other comprehensive (loss) income, net of tax	(0.7)	(74.3)	12.5	(47.5)
Comprehensive income	144.0	347.8	311.2	767.6
Comprehensive loss attributable to noncontrolling interests	(2.2)	0.0	(4.5)	0.0
Comprehensive income attributable to Olin Corporation	$ 146.2	$ 347.8	$ 315.7	$ 767.6