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SunBelt acquisition costs.

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- Definition

SunBelt interest expense

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- Definition

Cash remitted to PolyOne for distributable cash generated by SunBelt.

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- Definition

Additional accretion expense for the earn out liability that was recorded as a result of the acquisition included in pro forma results.

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- Definition

Additional amortization expense related to the fair value of acquired identifiable intangible assets included in pro forma results

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- Definition

SunBelt pretax income included in Chlor Alkali Products.

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The fair value of assets acquired in business combination.

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The total fair value of net assets and liabilities acquired, before allocation of goodwill.

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The amount of acquisition cost of a business combination allocated to preacquisition contingencies and earnouts based on future performance of business other than contingencies associated with income taxes.

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Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt, which are due within one year (or one business cycle if longer).

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Discrete deferred tax expense relating to the SunBelt acquisition.

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Percent of distributable cash generated by non-consolidated affiliate.

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Time term for earn out agreement.

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This item represents the entity's proportionate share of SunBelt's earnings for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Membrane technology capacity of plant.

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Ownership percentage of target after acquisition.

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Pro forma increase of tax provision due to fair value adjustments included in pro forma results.

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Reduction of depreciation expense related to the fair value adjustment to property, plant and equipment included in pro forma results

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Reduction in interest expense as a result of increasing the carrying value of acquired debt obligations to its estimated fair value included in pro forma results.

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Deferred tax expense related to the tax effect of gain on the remeasurement of equity interest in SunBelt included in pro forma results.

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The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Amount of cash paid to acquire the entity.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired in the business combination.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The amount of acquisition cost of a business combination allocated to assets acquired.

+ References

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The amount of acquisition cost of a business combination allocated to current assets.

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The amount of cash and cash equivalents acquired in a business combination.

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

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Amount of deferred tax assets or liabilities for the differences between the values assigned and the tax bases of assets and liabilities in a business combination, net of any valuation allowance for deferred tax assets.

+ References

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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The amount of acquisition cost of a business combination allocated to the noncurrent portion of the long-term debt assumed from the acquired entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The amount of acquisition cost of a business combination allocated to noncurrent assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of acquisition cost of a business combination allocated to other noncurrent liabilities of the acquired entity.

+ References

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- Definition

The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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- Definition

In a business combination achieved in stages, this element represents the acquisition-date fair value of the equity interest in the acquiree held by the acquirer immediately before the acquisition date.

+ References

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- Definition

In a business combination achieved in stages, this element represents the acquisition-date percentage of equity in the acquiree held by the acquirer immediately before the acquisition date.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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- Definition

Interest rate stated in the contractual debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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ACQUISITION (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended		12 Months Ended
	Feb. 28, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Feb. 28, 2011 SunBelt [Member]	Jun. 30, 2011 SunBelt [Member]	Jun. 30, 2011 SunBelt [Member]	Dec. 31, 2011 SunBelt [Member]	Mar. 31, 2011 SunBelt [Member]	Jun. 30, 2011 SunBelt [Member]	Jun. 30, 2010 SunBelt [Member]	Jun. 30, 2011 SunBelt [Member]	Jun. 30, 2010 SunBelt [Member]	Dec. 31, 2011 Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 22, 1997 Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 31, 2011 Guaranteed Senior Secured Notes due 2017, Series G [Member]	Dec. 22, 1997 Guaranteed Senior Secured Notes due 2017, Series G [Member]
Business Acquisition [Line Items]
PolyOne Corporation's interest in SunBelt (in hundredths)					50.00%
Cash consideration for SunBelt purchase					$ 132.3
Olin's ownership percentage of SunBelt after acquisition of PolyOne's interest (in hundredths)					100.00%
Membrane technology capacity of plant					350,000
Earn out agreement term					three year
Cash remitted to PolyOne for distributable cash generated by SunBelt						6.0
Distributable cash non-consolidated affiliate						50.00%
Required annual debt repayment for Series O and Series G notes								12.2						6.1		6.1
Remaining principal balance of consolidated notes						85.3	85.3
Previous equity percentage in SunBelt (in hundredths)					50.00%
Investment value in SunBelt prior to acquisition					(0.8)
Discrete deferred tax expense relating to the SunBelt acquisition							76.0
Total current assets					37.6
Property, plant and equipment					87.4
Deferred income taxes					0.4
Other assets					5.8
Total assets acquired					131.2
Total current liabilities					42.7
Long-term debt					75.1
Other liabilities					27.6
Total liabilities assumed					145.4
Less: Investment in SunBelt					(0.8)
Net liabilities assumed					(13.4)
Liabilities for uncertainties					48.3
Gain on remeasurement of investment in SunBelt	(181.4)
Goodwill					327.1				327.9
Fair value of assets acquired					180.6
Cash and cash equivalents					8.9
Current installment of long term debt					12.2
Accretion expense for SunBelt earn out						0.7	0.9
Equity earnings of nonconsolidated affiliate for Sunbelt					6.3
Debt Instrument [Line Items]
Face amount of senior secured notes															97.5		97.5
Interest rate on SunBelt notes															7.23%		7.23%
Amount of annual debt repayment attributable to notes								12.2						6.1		6.1
Finite-Lived Intangible Assets [Line Items]
Final valuation of intangible assets relating to customers, customer contracts and relationships	5.8
Estimated useful life of intangible assets	15
Tax deductible portion of goodwill	163.7
Segment Reporting Information [Line Items]
SunBelt sales										51.7		66.1
SunBelt pretax income										9.3		11.5
SunBelt pretax income included in Chlor Alkali Products										11.3		15.0
SunBelt acquisition costs												0.8
Sunbelt interest expense										1.3		1.8
Pro forma summary of the condensed statements of income as if the SunBelt acquisition occurred on January 1, 2010
Sales											447.1	991.4	836.7
Net income											26.4	74.5	41.5
Net income per common share basic (in dollars per share)											$ 0.33	$ 0.93	$ 0.53
Net income per common share diluted (in dollars per share)											$ 0.33	$ 0.92	$ 0.52
Additional amortization expense related to the fair value of acquired identifiable intangible assets											0.1	0.1	0.2
Reduction of depreciation expense related to the fair value adjustment to property, plant and equipment											1.5	1.0	2.9
Reduction in interest expense as a result of increasing the carrying value of acquired debt obligations to its estimated fair value											0.1	0.1	0.2
Additional accretion expense for the earn out liability that was recorded as a result of the acquisition		0.7	0.4	1.3
Deferred tax expense related to the tax effect of gain on the remeasurement of equity interest in SunBelt												76.0
Pro forma increase of tax provision due to fair value adjustments											$ 2.5	$ 2.5	$ 2.7