DEBT (Tables)

12 Months Ended

Dec. 31, 2012

Debt Instruments [Abstract]

Schedule of long-term debt

	December 31,
	2012		2011
Notes payable:	($ in millions)
Variable-rate Go Zone bonds, due 2024 (1.72% and 1.78% at December 31, 2012 and 2011, respectively)	$	50.0	$	50.0
Variable-rate Recovery Zone bonds, due 2024-2035 (1.72% and 1.78% at December 31, 2012 and 2011, respectively)	103.0		103.0
Variable-rate Industrial development and environmental improvement obligations due 2025 (0.26% and 0.67% at December 31, 2012 and 2011, respectively, and includes interest rate swaps of $0.3 million in 2011)	2.9		10.9
5.5%, due 2022	200.0		—
6.5%, due 2013	11.4		11.4
6.75%, due 2016 (includes interest rate swaps of $8.4 million and $10.5 million in 2012 and 2011, respectively)	133.4		135.5
7.23%, SunBelt Notes due 2013-2017 (includes unamortized fair value premium of $1.1 million and $1.6 million and interest rate swaps of $1.8 million and $1.9 million in 2012 and 2011, respectively)	63.9		76.6
8.875%, due 2019 (includes unamortized discount of $0.9 million in 2012 and $1.0 million in 2011)	149.1		149.0
Total debt	713.7		536.4
Amounts due within one year	23.6		12.2
Total long-term debt	$	690.1	$	524.2

Swap activity related to certain debt obligations

Underlying Debt Instrument	Swap Amount		Date of Swap	December 31, 2012
	($ in millions)			Olin Pays Floating Rate:
6.75%, due 2016	$	65.0	March 2010	3.5 - 4.5%	(a)
6.75%, due 2016	$	60.0	March 2010	3.5 - 4.5%	(a)
				Olin Receives Floating Rate:
6.75%, due 2016	$	65.0	October 2011	3.5 - 4.5%	(a)
6.75%, due 2016	$	60.0	October 2011	3.5 - 4.5%	(a)