Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2012
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies This Quarterly Report on Form 10-Q (this "Report") should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 and our Current Reports on Form 8-K filed on May 14, 2012 (second report filed) and July 23, 2012 (two reports). Organization and Nature of Operations. Kaiser Aluminum Corporation (together with its subsidiaries, unless the context otherwise requires, the “Company”) specializes in the production of semi-fabricated specialty aluminum products, with its operations consisting of one reportable segment in the aluminum industry, referred to herein as Fabricated Products. The Company also owns a non-controlling interest in a secondary aluminum facility. See Note 13 for additional information regarding the Company’s reportable segment and its other business units, referred to herein as All Other. Principles of Consolidation and Basis of Presentation. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and are prepared in accordance with United States generally accepted accounting principles (“US GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, these financial statements do not include all of the disclosures required by US GAAP for complete financial statements. In the opinion of management, the unaudited interim consolidated financial statements furnished herein include all adjustments (all of which are of a normal recurring nature unless otherwise noted) necessary to present fairly the results for the interim periods presented. Intercompany balances and transactions are eliminated. The consolidated financial statements include the results of manufacturing facilities acquired by the Company from the effective date of each acquisition. The Company has suspended the use of the equity method of accounting with respect to its 49% non-controlling interest in Anglesey Aluminium Limited ("Anglesey"). As a result, the Company did not record equity in income from Anglesey for any of the periods presented herein. The carrying amount of the Company’s investment in Anglesey was zero at both September 30, 2012 and December 31, 2011. The Company does not anticipate resuming the use of the equity method of accounting with respect to its investment in Anglesey during the next 12 months. See Note 3 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2010 for additional details on our investment in Anglesey and the suspension of equity method of accounting with respect to our ownership in Anglesey. Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in accordance with US GAAP requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses during the reporting period. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of the Company’s consolidated financial statements; accordingly, it is possible that the actual results could differ from these estimates and assumptions, which could have a material effect on the reported amounts of the Company’s consolidated financial position and results of operations. Recognition of Sales. Sales are generally recognized on a gross basis when title, ownership and risk of loss pass to the buyer and collectability is reasonably assured. A provision for estimated sales returns from, and allowances to, customers is made in the same period as the related revenues are recognized, based on historical experience or the specific identification of an event necessitating a reserve. From time to time, in the ordinary course of business, the Company may enter into agreements with customers in which the Company, in return for a fee, agrees to reserve certain amounts of its existing production capacity for the customer, defer an existing customer purchase commitment into future periods and reserve certain amounts of its expected production capacity in those periods for the customer, or cancel or reduce existing commitments under existing contracts. These agreements may have terms or impact periods exceeding one year. Certain of the capacity reservation and commitment deferral agreements provide for periodic, such as quarterly or annual, billing for the duration of the contract. For capacity reservation agreements, the Company recognizes revenue ratably over the period of the capacity reservation. Accordingly, the Company may recognize revenue prior to billing reservation fees. Unbilled receivables are included within Trade receivables on the Company’s Consolidated Balance Sheets (see Note 2). For commitment deferral agreements, the Company recognizes revenue upon the earlier occurrence of the related sale of product or the end of the commitment period. In connection with other agreements, the Company may collect funds from customers in advance of the periods for which (i) the production capacity is reserved, (ii) commitments are deferred, (iii) commitments are reduced or (iv) performance is completed, in which event the recognition of revenue is deferred until the fee is earned. Any unearned fees are included within Other accrued liabilities or Long-term liabilities, as appropriate, on the Company’s Consolidated Balance Sheets (see Note 2). Stock-Based Compensation. Stock-based compensation in the form of service-based awards is provided to executive officers, certain employees and directors, and is accounted for at fair value. The Company measures the cost of services received in exchange for an award of equity instruments based on the grant-date fair value of the award and the number of awards expected to ultimately vest. The cost of an award is generally recognized as an expense over the requisite service period of the award on a straight-line basis unless the award is deemed to no longer be subject to a substantial risk of forfeiture for tax purposes and deemed to be income earned by the participant despite the underlying share remaining unvested. The Company has elected to amortize compensation expense for equity awards with graded vesting using the straight-line method (see Note 8). The Company also grants performance-based awards to executive officers and other key employees. These awards are subject to performance requirements pertaining to the Company’s economic value added (“EVA”) performance, measured over specified 3 year performance periods. EVA is a measure of the excess of the Company’s adjusted pre-tax operating income for a particular year over a pre-determined percentage of the adjusted net assets of the immediately preceding year, as defined in the Company’s annual long-term incentive (“LTI”) programs. The number of performance shares, if any, that will ultimately vest and result in the issuance of common shares depends on the average annual EVA achieved for the specified 3-year performance periods. The fair value of performance-based awards is measured based on the most probable outcome of the performance condition, which is estimated quarterly using the Company’s forecast and actual results. The Company expenses the fair value, after assuming an estimated forfeiture rate, over the specified 3-year performance periods on a ratable basis (see Note 8). Available for Sale Securities. The Company accounts for investments in certain marketable debt and equity securities as available for sale securities. Such securities are recorded at fair value (see “Fair Values of Financial Assets and Liabilities - Available for Sale Securities” in Note 11), with net unrealized gains and losses, net of income taxes, reflected in other comprehensive earnings as a component of Stockholders' equity. The Company's available for sale securities include securities invested in various investment funds and managed by a third-party trust in connection with the Company's deferred compensation program (see Note 7) as well as short-term commercial paper. Commercial paper with an original maturity of less than 90 days is classified as Cash and cash equivalents (see Note 2). Commercial paper with an original maturity of greater than 90 days is presented as Short-term investments on the Consolidated Balance Sheets. Securities invested in various investment funds are included in Other assets (see Note 2). Inventories. Inventories are stated at the lower of cost or market value. Finished products, work-in-process and raw material inventories are stated on the last-in, first-out (“LIFO”) basis. The Company recorded net non-cash LIFO benefits of approximately $5.7 and $7.1 during the quarters ended September 30, 2012 and September 30, 2011, respectively. The Company recorded net non-cash LIFO (benefits) charges of approximately $(13.5) and $12.8 during the nine months ended September 30, 2012 and September 30, 2011, respectively. These amounts are primarily a result of changes in metal prices and changes in inventory volumes. The excess of current cost over the stated LIFO value of inventory at September 30, 2012 and December 31, 2011 was $15.8 and $29.4, respectively. Other inventories, principally operating supplies and repair and maintenance parts, are stated at average cost. Inventory costs consist of material, labor and manufacturing overhead, including depreciation. Abnormal costs, such as idle facility expenses, freight, handling costs and spoilage, are accounted for as current period charges. All of the Company’s inventories at September 30, 2012 and December 31, 2011 were included in the Fabricated Products segment (see Note 2 for the components of inventories). Property, Plant, and Equipment – Net. Property, plant and equipment is recorded at cost (see Note 2). Construction in progress is included within Property, plant, and equipment – net on the Consolidated Balance Sheets. Interest related to the construction of qualifying assets is capitalized as part of the construction costs. The aggregate amount of interest capitalized is limited to the interest expense incurred in the period. The amount of interest expense capitalized as construction in progress was $0.3 and $0.4 during the quarters ended September 30, 2012 and September 30, 2011, respectively. The amount of interest expense capitalized as construction in progress was $1.4 and $0.8 during the nine months ended September 30, 2012 and September 30, 2011, respectively. Depreciation is computed using the straight-line method at rates based on the estimated useful lives of the various classes of assets. Capital lease assets and leasehold improvements are depreciated on a straight-line basis over the shorter of the estimated useful lives of the assets or the lease term. Depreciation expense is not included in Cost of products sold, excluding depreciation and amortization, but is included in Depreciation and amortization on the Statements of Consolidated Income. For the quarters ended September 30, 2012 and September 30, 2011, the Company recorded depreciation expense of $6.1 and $5.6, respectively, relating to the Company’s operating facilities in its Fabricated Products segment. For the nine months ended September 30, 2012 and September 30, 2011, the Company recorded depreciation expense of $17.9 and $17.0, respectively, relating to the Company's operating facilities in its Fabricated Products segment. An immaterial amount of depreciation expense was also recorded relating to the Company’s Corporate and Other business unit for all periods presented in this Report. Property, plant and equipment is reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset or group of assets may not be recoverable. The Company regularly assesses whether events and circumstances with the potential to trigger impairment have occurred and relies on a number of factors, including operating results, business plans, economic projections, and anticipated future cash flow, to make such assessments. The Company uses an estimate of the future undiscounted cash flows of the related asset or asset group over the estimated remaining life of such asset(s) in measuring whether the asset(s) are recoverable. Measurement of the amount of impairment, if any, is based on the difference between the carrying value of the asset(s) and the estimated fair value of such asset(s). Fair value is determined through a series of standard valuation techniques. See “Fair Values of Non-financial Assets and Liabilities” in Note 11 for additional information regarding fair value assessments relating to certain property, plant and equipment. Property, plant and equipment held for future development are presented as idled assets. Such assets are evaluated for impairment on a held-and-used basis. Depreciation expense is not adjusted when assets are temporarily idled. Goodwill and Intangible Assets. Goodwill is tested for impairment on an annual basis during the fourth quarter as well as on an interim basis, as warranted, at the time of relevant events and changes in circumstances. Intangible assets with definite lives are initially recognized at fair value and subsequently amortized over the estimated useful lives to reflect the pattern in which the economic benefits of the intangible assets are consumed. In the event the pattern cannot be reliably determined, the Company uses a straight-line amortization method. Whenever events or changes in circumstances indicate that the carrying amount of the intangible assets may not be recoverable, the intangible assets are reviewed for impairment. Conditional Asset Retirement Obligations (“CAROs”). The Company has CAROs at several of its fabricated products facilities. The vast majority of such CAROs consist of incremental costs that would be associated with the removal and disposal of asbestos (all of which is believed to be fully contained and encapsulated within walls, floors, roofs, ceilings or piping) at certain of the Company's older facilities if such facilities were to undergo major renovation or be demolished. The Company estimates incremental costs for special handling, removal and disposal costs of materials that may or will give rise to CAROs and then discounts the expected costs back to the current year using a credit-adjusted, risk-free rate. The Company recognizes liabilities and costs for CAROs even if it is unclear when or if CAROs will be triggered. When it is unclear when or if CAROs will be triggered, the Company uses probability weighting for possible timing scenarios to determine the probability-weighted amounts that should be recognized in the Company's consolidated financial statements (see Note 11). Self Insurance of Employee Health and Workers’ Compensation Liabilities. The Company is primarily self-insured for group health insurance and workers’ compensation benefits provided to employees. Self insurance liabilities are estimated for claims incurred-but-not-paid based on judgment, using the Company’s historical claim data and information and analysis provided by actuarial and claim advisors, our insurance carriers and other professionals. The Company accounts for accrued liability relating to workers’ compensation claims on a discounted basis. The undiscounted workers’ compensation liabilities were $24.2 and $24.3 and discount rates of 0.75% and 1.00% were used to estimate discounted liabilities at September 30, 2012 and December 31, 2011, respectively. The accrued liability for health insurance and workers’ compensation claims is included in Other accrued liabilities or Long-term liabilities, as appropriate (see Note 2). Environmental Contingencies. With respect to environmental loss contingencies, the Company records a loss contingency whenever a contingency is probable and reasonably estimable. Accruals for estimated losses from environmental remediation obligations are generally recognized no later than the completion of the remedial feasibility study. Such accruals are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted to their present value. Accruals for expected environmental costs are included in Other accrued liabilities or Long-term liabilities, as appropriate (see Note 2). Environmental expense relating to continuing operations is included in Cost of products sold, excluding depreciation and amortization on the Statements of Consolidated Income. Environmental expense relating to non-operating locations is included in Selling, administrative, research and development, and general on the Statements of Consolidated Income. Derivative Financial Instruments. Hedging transactions using derivative financial instruments are primarily designed to mitigate the Company’s exposure to changes in prices for certain of the products which the Company sells and consumes and, to a lesser extent, to mitigate the Company’s exposure to changes in foreign currency exchange rates. From time to time, the Company also enters into hedging arrangements in connection with financing transactions to mitigate financial risks. The Company does not utilize derivative financial instruments for trading or other speculative purposes. The Company’s derivative activities are initiated within guidelines established by management and approved by the Company’s Board of Directors. Hedging transactions are executed centrally on behalf of all of the Company’s business units to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors. The Company recognizes all derivative instruments as assets or liabilities on its Consolidated Balance Sheets and measures these instruments at fair value by “marking-to-market” all of its hedging positions at each period-end (see Note 11). Because the Company does not meet the documentation requirements for hedge (deferral) accounting, unrealized and realized gains and losses associated with hedges of operational risks are reflected as a reduction or increase in Cost of products sold, excluding depreciation and amortization. Unrealized and realized gains and losses relating to hedges of financing transactions are reflected as a component of Other income (expense), net (see Note 15). See Note 10 for additional information about realized and unrealized gains and losses relating to the Company’s derivative financial instruments. Fair Value Measurement. The Company applies the provisions of Accounting Standards Update (“ASU”) Topic 820, Fair Value Measurements and Disclosures, in measuring the fair value of its derivative contracts, plan assets invested by certain of the Company's employee benefit plans and its cash convertible senior notes (see Note 11). Earnings per Share. Basic earnings per share is computed by dividing earnings by the weighted-average number of common shares outstanding during the applicable period. The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards. Any shares that were owned by a voluntary employee's beneficiary association (“VEBA”) for the benefit of certain union retirees, their surviving spouses and eligible dependents (the “Union VEBA”) that were subject to transfer restrictions, while treated on the Consolidated Balance Sheets as being similar to treasury stock (i.e., as a reduction in Stockholders' equity), are included in the computation of basic weighted-average number of common shares outstanding because such shares were irrevocably issued and have full dividend and voting rights. Diluted earnings per share is calculated under the treasury stock method (see Note 12). Concentration of Credit Risk. Financial arrangements which potentially subject the Company to concentrations of credit risk consist of metal, currency, electricity and natural gas derivative contracts, certain cash-settled call options that the Company purchased in March 2010 (the “Call Options”) (see Note 3), short term investments, and arrangements related to the Company’s cash equivalents. If the market value of the Company’s net commodity and currency derivative positions with certain counterparties exceeds the applicable threshold, if any, the counterparty is required to transfer cash collateral in excess of the threshold to the Company. Conversely, if the market value of these net derivative positions falls below a specified threshold, the Company is required to transfer cash collateral below the threshold to certain counterparties. At both September 30, 2012 and December 31, 2011, the Company had no margin deposits with or from its counterparties. The Company is exposed to credit loss in the event of nonperformance by counterparties on derivative contracts used in hedging activities as well as failure of counterparties to return cash collateral previously transferred to the counterparties. The counterparties to the Company’s derivative contracts are major financial institutions, and the Company does not expect nonperformance by any of its counterparties. The Company places its cash in bank deposits, commercial paper, and money market funds. Such money market funds are with high credit quality financial institutions which invest primarily in commercial paper and time deposits of prime quality, short-term repurchase agreements, U.S. government notes and government agency notes. New Accounting Pronouncements. ASU No. 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”), was issued in May 2011. This ASU represents the converged guidance of the Financial Accounting Standards Board and the International Accounting Standards Board on fair value measurement. ASU 2011-04 sets forth common requirements for measuring fair value and for disclosing information about fair value measurements, including a consistent meaning of the term “fair value.” The provisions in this ASU are to be applied prospectively. For public entities, this ASU became effective for interim and annual periods beginning after December 15, 2011. The Company adopted the provisions of ASU 2011-04 during the interim period ending March 31, 2012. The adoption of this ASU did not have a material impact on the consolidated financial statements. ASU No. 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities ("ASU 2011-11"), was issued in November 2011. This ASU requires an entity to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. An entity is required to adopt ASU 2011-11 for reporting periods beginning on or after January 1, 2013. The Company does not expect the adoption of ASU 2011-11 to have a material impact on its financial statements. ASU No. 2012-02, Intangibles-Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. ("ASU 2012-02"), was issued in July 2012. This ASU states that an entity has the option to assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the indefinite-lived intangible asset is impaired. If, after assessing the totality of events and circumstances, an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with Codification Subtopic 350-30, Intangibles-Goodwill and Other, General Intangibles Other than Goodwill. Under the guidance in this ASU, an entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test. An entity will be able to resume performing the qualitative assessment in any subsequent period. An entity is required to adopt ASU 2012-02 for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. The Company does not expect the adoption of ASU 2012-02 to have any impact on its financial statements.

Summary of Significant Accounting Policies

This Quarterly Report on Form 10-Q (this "Report") should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 and our Current Reports on Form 8-K filed on May 14, 2012 (second report filed) and July 23, 2012 (two reports).

Organization and Nature of Operations. Kaiser Aluminum Corporation (together with its subsidiaries, unless the context otherwise requires, the “Company”) specializes in the production of semi-fabricated specialty aluminum products, with its operations consisting of one reportable segment in the aluminum industry, referred to herein as Fabricated Products. The Company also owns a non-controlling interest in a secondary aluminum facility. See Note 13 for additional information regarding the Company’s reportable segment and its other business units, referred to herein as All Other.

Principles of Consolidation and Basis of Presentation. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and are prepared in accordance with United States generally accepted accounting principles (“US GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, these financial statements do not include all of the disclosures required by US GAAP for complete financial statements. In the opinion of management, the unaudited interim consolidated financial statements furnished herein include all adjustments (all of which are of a normal recurring nature unless otherwise noted) necessary to present fairly the results for the interim periods presented. Intercompany balances and transactions are eliminated. The consolidated financial statements include the results of manufacturing facilities acquired by the Company from the effective date of each acquisition.

The Company has suspended the use of the equity method of accounting with respect to its 49% non-controlling interest in Anglesey Aluminium Limited ("Anglesey"). As a result, the Company did not record equity in income from Anglesey for any of the periods presented herein. The carrying amount of the Company’s investment in Anglesey was zero at both September 30, 2012 and December 31, 2011. The Company does not anticipate resuming the use of the equity method of accounting with respect to its investment in Anglesey during the next 12 months. See Note 3 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2010 for additional details on our investment in Anglesey and the suspension of equity method of accounting with respect to our ownership in Anglesey.

Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in accordance with US GAAP requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses during the reporting period. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of the Company’s consolidated financial statements; accordingly, it is possible that the actual results could differ from these estimates and assumptions, which could have a material effect on the reported amounts of the Company’s consolidated financial position and results of operations.

Recognition of Sales. Sales are generally recognized on a gross basis when title, ownership and risk of loss pass to the buyer and collectability is reasonably assured. A provision for estimated sales returns from, and allowances to, customers is made in the same period as the related revenues are recognized, based on historical experience or the specific identification of an event necessitating a reserve.

From time to time, in the ordinary course of business, the Company may enter into agreements with customers in which the Company, in return for a fee, agrees to reserve certain amounts of its existing production capacity for the customer, defer an existing customer purchase commitment into future periods and reserve certain amounts of its expected production capacity in those periods for the customer, or cancel or reduce existing commitments under existing contracts. These agreements may have terms or impact periods exceeding one year.

Certain of the capacity reservation and commitment deferral agreements provide for periodic, such as quarterly or annual, billing for the duration of the contract. For capacity reservation agreements, the Company recognizes revenue ratably over the period of the capacity reservation. Accordingly, the Company may recognize revenue prior to billing reservation fees. Unbilled receivables are included within Trade receivables on the Company’s Consolidated Balance Sheets (see Note 2). For commitment deferral agreements, the Company recognizes revenue upon the earlier occurrence of the related sale of product or the end of the commitment period. In connection with other agreements, the Company may collect funds from customers in advance of the periods for which (i) the production capacity is reserved, (ii) commitments are deferred, (iii) commitments are reduced or (iv) performance is completed, in which event the recognition of revenue is deferred until the fee is earned. Any unearned fees are included within Other accrued liabilities or Long-term liabilities, as appropriate, on the Company’s Consolidated Balance Sheets (see Note 2).

Stock-Based Compensation. Stock-based compensation in the form of service-based awards is provided to executive officers, certain employees and directors, and is accounted for at fair value. The Company measures the cost of services received in exchange for an award of equity instruments based on the grant-date fair value of the award and the number of awards expected to ultimately vest. The cost of an award is generally recognized as an expense over the requisite service period of the award on a straight-line basis unless the award is deemed to no longer be subject to a substantial risk of forfeiture for tax purposes and deemed to be income earned by the participant despite the underlying share remaining unvested. The Company has elected to amortize compensation expense for equity awards with graded vesting using the straight-line method (see Note 8).

The Company also grants performance-based awards to executive officers and other key employees. These awards are subject to performance requirements pertaining to the Company’s economic value added (“EVA”) performance, measured over specified 3 year performance periods. EVA is a measure of the excess of the Company’s adjusted pre-tax operating income for a particular year over a pre-determined percentage of the adjusted net assets of the immediately preceding year, as defined in the Company’s annual long-term incentive (“LTI”) programs. The number of performance shares, if any, that will ultimately vest and result in the issuance of common shares depends on the average annual EVA achieved for the specified 3-year performance periods. The fair value of performance-based awards is measured based on the most probable outcome of the performance condition, which is estimated quarterly using the Company’s forecast and actual results. The Company expenses the fair value, after assuming an estimated forfeiture rate, over the specified 3-year performance periods on a ratable basis (see Note 8).

Available for Sale Securities. The Company accounts for investments in certain marketable debt and equity securities as available for sale securities. Such securities are recorded at fair value (see “Fair Values of Financial Assets and Liabilities - Available for Sale Securities” in Note 11), with net unrealized gains and losses, net of income taxes, reflected in other comprehensive earnings as a component of Stockholders' equity. The Company's available for sale securities include securities invested in various investment funds and managed by a third-party trust in connection with the Company's deferred compensation program (see Note 7) as well as short-term commercial paper. Commercial paper with an original maturity of less than 90 days is classified as Cash and cash equivalents (see Note 2). Commercial paper with an original maturity of greater than 90 days is presented as Short-term investments on the Consolidated Balance Sheets. Securities invested in various investment funds are included in Other assets (see Note 2).

Inventories. Inventories are stated at the lower of cost or market value. Finished products, work-in-process and raw material inventories are stated on the last-in, first-out (“LIFO”) basis. The Company recorded net non-cash LIFO benefits of approximately $5.7 and $7.1 during the quarters ended September 30, 2012 and September 30, 2011, respectively. The Company recorded net non-cash LIFO (benefits) charges of approximately $(13.5) and $12.8 during the nine months ended September 30, 2012 and September 30, 2011, respectively. These amounts are primarily a result of changes in metal prices and changes in inventory volumes. The excess of current cost over the stated LIFO value of inventory at September 30, 2012 and December 31, 2011 was $15.8 and $29.4, respectively. Other inventories, principally operating supplies and repair and maintenance parts, are stated at average cost. Inventory costs consist of material, labor and manufacturing overhead, including depreciation. Abnormal costs, such as idle facility expenses, freight, handling costs and spoilage, are accounted for as current period charges. All of the Company’s inventories at September 30, 2012 and December 31, 2011 were included in the Fabricated Products segment (see Note 2 for the components of inventories).

Property, Plant, and Equipment – Net. Property, plant and equipment is recorded at cost (see Note 2). Construction in progress is included within Property, plant, and equipment – net on the Consolidated Balance Sheets. Interest related to the construction of qualifying assets is capitalized as part of the construction costs. The aggregate amount of interest capitalized is limited to the interest expense incurred in the period. The amount of interest expense capitalized as construction in progress was $0.3 and $0.4 during the quarters ended September 30, 2012 and September 30, 2011, respectively. The amount of interest expense capitalized as construction in progress was $1.4 and $0.8 during the nine months ended September 30, 2012 and September 30, 2011, respectively.

Depreciation is computed using the straight-line method at rates based on the estimated useful lives of the various classes of assets. Capital lease assets and leasehold improvements are depreciated on a straight-line basis over the shorter of the estimated useful lives of the assets or the lease term. Depreciation expense is not included in Cost of products sold, excluding depreciation and amortization, but is included in Depreciation and amortization on the Statements of Consolidated Income. For the quarters ended September 30, 2012 and September 30, 2011, the Company recorded depreciation expense of $6.1 and $5.6, respectively, relating to the Company’s operating facilities in its Fabricated Products segment. For the nine months ended September 30, 2012 and September 30, 2011, the Company recorded depreciation expense of $17.9 and $17.0, respectively, relating to the Company's operating facilities in its Fabricated Products segment. An immaterial amount of depreciation expense was also recorded relating to the Company’s Corporate and Other business unit for all periods presented in this Report.

Property, plant and equipment is reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset or group of assets may not be recoverable. The Company regularly assesses whether events and circumstances with the potential to trigger impairment have occurred and relies on a number of factors, including operating results, business plans, economic projections, and anticipated future cash flow, to make such assessments. The Company uses an estimate of the future undiscounted cash flows of the related asset or asset group over the estimated remaining life of such asset(s) in measuring whether the asset(s) are recoverable. Measurement of the amount of impairment, if any, is based on the difference between the carrying value of the asset(s) and the estimated fair value of such asset(s). Fair value is determined through a series of standard valuation techniques. See “Fair Values of Non-financial Assets and Liabilities” in Note 11 for additional information regarding fair value assessments relating to certain property, plant and equipment.

Property, plant and equipment held for future development are presented as idled assets. Such assets are evaluated for impairment on a held-and-used basis. Depreciation expense is not adjusted when assets are temporarily idled.

Goodwill and Intangible Assets. Goodwill is tested for impairment on an annual basis during the fourth quarter as well as on an interim basis, as warranted, at the time of relevant events and changes in circumstances. Intangible assets with definite lives are initially recognized at fair value and subsequently amortized over the estimated useful lives to reflect the pattern in which the economic benefits of the intangible assets are consumed. In the event the pattern cannot be reliably determined, the Company uses a straight-line amortization method. Whenever events or changes in circumstances indicate that the carrying amount of the intangible assets may not be recoverable, the intangible assets are reviewed for impairment.

Conditional Asset Retirement Obligations (“CAROs”). The Company has CAROs at several of its fabricated products facilities. The vast majority of such CAROs consist of incremental costs that would be associated with the removal and disposal of asbestos (all of which is believed to be fully contained and encapsulated within walls, floors, roofs, ceilings or piping) at certain of the Company's older facilities if such facilities were to undergo major renovation or be demolished. The Company estimates incremental costs for special handling, removal and disposal costs of materials that may or will give rise to CAROs and then discounts the expected costs back to the current year using a credit-adjusted, risk-free rate. The Company recognizes liabilities and costs for CAROs even if it is unclear when or if CAROs will be triggered. When it is unclear when or if CAROs will be triggered, the Company uses probability weighting for possible timing scenarios to determine the probability-weighted amounts that should be recognized in the Company's consolidated financial statements (see Note 11).

Self Insurance of Employee Health and Workers’ Compensation Liabilities. The Company is primarily self-insured for group health insurance and workers’ compensation benefits provided to employees. Self insurance liabilities are estimated for claims incurred-but-not-paid based on judgment, using the Company’s historical claim data and information and analysis provided by actuarial and claim advisors, our insurance carriers and other professionals. The Company accounts for accrued liability relating to workers’ compensation claims on a discounted basis. The undiscounted workers’ compensation liabilities were $24.2 and $24.3 and discount rates of 0.75% and 1.00% were used to estimate discounted liabilities at September 30, 2012 and December 31, 2011, respectively. The accrued liability for health insurance and workers’ compensation claims is included in Other accrued liabilities or Long-term liabilities, as appropriate (see Note 2).

Environmental Contingencies. With respect to environmental loss contingencies, the Company records a loss contingency whenever a contingency is probable and reasonably estimable. Accruals for estimated losses from environmental remediation obligations are generally recognized no later than the completion of the remedial feasibility study. Such accruals are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted to their present value. Accruals for expected environmental costs are included in Other accrued liabilities or Long-term liabilities, as appropriate (see Note 2). Environmental expense relating to continuing operations is included in Cost of products sold, excluding depreciation and amortization on the Statements of Consolidated Income. Environmental expense relating to non-operating locations is included in Selling, administrative, research and development, and general on the Statements of Consolidated Income.

Derivative Financial Instruments. Hedging transactions using derivative financial instruments are primarily designed to mitigate the Company’s exposure to changes in prices for certain of the products which the Company sells and consumes and, to a lesser extent, to mitigate the Company’s exposure to changes in foreign currency exchange rates. From time to time, the Company also enters into hedging arrangements in connection with financing transactions to mitigate financial risks.

The Company does not utilize derivative financial instruments for trading or other speculative purposes. The Company’s derivative activities are initiated within guidelines established by management and approved by the Company’s Board of Directors. Hedging transactions are executed centrally on behalf of all of the Company’s business units to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors.

The Company recognizes all derivative instruments as assets or liabilities on its Consolidated Balance Sheets and measures these instruments at fair value by “marking-to-market” all of its hedging positions at each period-end (see Note 11). Because the Company does not meet the documentation requirements for hedge (deferral) accounting, unrealized and realized gains and losses associated with hedges of operational risks are reflected as a reduction or increase in Cost of products sold, excluding depreciation and amortization. Unrealized and realized gains and losses relating to hedges of financing transactions are reflected as a component of Other income (expense), net (see Note 15). See Note 10 for additional information about realized and unrealized gains and losses relating to the Company’s derivative financial instruments.

Fair Value Measurement. The Company applies the provisions of Accounting Standards Update (“ASU”) Topic 820, Fair Value Measurements and Disclosures, in measuring the fair value of its derivative contracts, plan assets invested by certain of the Company's employee benefit plans and its cash convertible senior notes (see Note 11).

Earnings per Share. Basic earnings per share is computed by dividing earnings by the weighted-average number of common shares outstanding during the applicable period. The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards. Any shares that were owned by a voluntary employee's beneficiary association (“VEBA”) for the benefit of certain union retirees, their surviving spouses and eligible dependents (the “Union VEBA”) that were subject to transfer restrictions, while treated on the Consolidated Balance Sheets as being similar to treasury stock (i.e., as a reduction in Stockholders' equity), are included in the computation of basic weighted-average number of common shares outstanding because such shares were irrevocably issued and have full dividend and voting rights. Diluted earnings per share is calculated under the treasury stock method (see Note 12).

Concentration of Credit Risk. Financial arrangements which potentially subject the Company to concentrations of credit risk consist of metal, currency, electricity and natural gas derivative contracts, certain cash-settled call options that the Company purchased in March 2010 (the “Call Options”) (see Note 3), short term investments, and arrangements related to the Company’s cash equivalents. If the market value of the Company’s net commodity and currency derivative positions with certain counterparties exceeds the applicable threshold, if any, the counterparty is required to transfer cash collateral in excess of the threshold to the Company. Conversely, if the market value of these net derivative positions falls below a specified threshold, the Company is required to transfer cash collateral below the threshold to certain counterparties. At both September 30, 2012 and December 31, 2011, the Company had no margin deposits with or from its counterparties.

The Company is exposed to credit loss in the event of nonperformance by counterparties on derivative contracts used in hedging activities as well as failure of counterparties to return cash collateral previously transferred to the counterparties. The counterparties to the Company’s derivative contracts are major financial institutions, and the Company does not expect nonperformance by any of its counterparties.

The Company places its cash in bank deposits, commercial paper, and money market funds. Such money market funds are with high credit quality financial institutions which invest primarily in commercial paper and time deposits of prime quality, short-term repurchase agreements, U.S. government notes and government agency notes.

New Accounting Pronouncements.

ASU No. 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”), was issued in May 2011. This ASU represents the converged guidance of the Financial Accounting Standards Board and the International Accounting Standards Board on fair value measurement. ASU 2011-04 sets forth common requirements for measuring fair value and for disclosing information about fair value measurements, including a consistent meaning of the term “fair value.” The provisions in this ASU are to be applied prospectively. For public entities, this ASU became effective for interim and annual periods beginning after December 15, 2011. The Company adopted the provisions of ASU 2011-04 during the interim period ending March 31, 2012. The adoption of this ASU did not have a material impact on the consolidated financial statements.

ASU No. 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities ("ASU 2011-11"), was issued in November 2011. This ASU requires an entity to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. An entity is required to adopt ASU 2011-11 for reporting periods beginning on or after January 1, 2013. The Company does not expect the adoption of ASU 2011-11 to have a material impact on its financial statements.

ASU No. 2012-02, Intangibles-Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment.

("ASU 2012-02"), was issued in July 2012. This ASU states that an entity has the option to assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the indefinite-lived intangible asset is impaired. If, after assessing the totality of events and circumstances, an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with Codification Subtopic 350-30, Intangibles-Goodwill and Other, General Intangibles Other than Goodwill. Under the guidance in this ASU, an entity also has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test. An entity will be able to resume performing the qualitative assessment in any subsequent period. An entity is required to adopt ASU 2012-02 for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. The Company does not expect the adoption of ASU 2012-02 to have any impact on its financial statements.