ACQUISITION (Tables) (KA Steel [Member])

6 Months Ended

Jun. 30, 2013

KA Steel [Member]

Business Acquisition [Line Items]

Schedule of Purchase Price Allocation [Table Text Block]

	August 22, 2012
	($ in millions)
Total current assets	$	128.1
Property, plant and equipment	25.1
Deferred taxes	1.6
Intangible assets	139.3
Total assets acquired	294.1
Total current liabilities	64.2
Other liabilities	10.4
Total liabilities assumed	74.6
Net identifiable assets acquired	219.5
Goodwill	119.7
Fair value of net assets acquired	$	339.2
Supplemental Data
Cash paid	$	336.6
Olin trade accounts receivable from KA Steel	2.6
Total fair value of consideration	$	339.2

Business Acquisition, Pro Forma Information [Table Text Block]

	Three Months Ended June 30, 2012		Six Months Ended June 30, 2012
	($ in millions, except per share data)
Sales	$	617.0	$	1,230.9
Net income	48.3		86.9
Net income per common share:
Basic	$	0.60	$	1.08
Diluted	$	0.60	$	1.08