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Summary of Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | 1. Summary of Significa nt Accounting Policies In this Annual Report on Form 10-K (this “Report”), unless the context otherwise requires, references in these notes to consolidated financial statements to “Kaiser Aluminum Corporation,” “Kaiser,” “we,” “us,” “our,” “the Company” and “our Company” refer collectively to Kaiser Aluminum Corporation and its subsidiaries. Organization and Nature of Operations. Kaiser Aluminum Corporation specializes in the production of semi-fabricated specialty aluminum mill products, such as aluminum plate and sheet, bare and coated coil and extruded and drawn products, for the following end market applications: (i) aerospace and high strength (“Aero/HS products”); (ii) beverage and food packaging (“Packaging”); (iii) general engineering (“GE products”); (iv) automotive (“Automotive Extrusions”); and (v) other industrial (“Other products”). Our business is organized into one operating segment. See Note 17 for additional information regarding our business, product and geographical area information and concentration of risk. Principles of Consolidation and Basis of Presentation. Our consolidated financial statements include the accounts of our wholly owned subsidiaries and are prepared in accordance with United States generally accepted accounting principles (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”). Intercompany balances and transactions are eliminated. Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in accordance with 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 our 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 our consolidated financial position and results of operations. Supply Chain Financing. Upon our acquisition of Warrick (as defined in Note 4), we became party to several supply chain financing arrangements, in which we may sell certain of our customers’ trade accounts receivable to such customers’ financial institutions without recourse. We sell our undivided interests in certain of these receivables at our discretion when we determine that the cost of these arrangements is less than the cost of servicing our receivables with existing debt. Under the terms of the agreements, we retain no rights or interest, have no obligations with respect to the sold receivables and do not service the receivables after the sale. As such, these transactions are being accounted for as a sale. During the years ended December 31, 2022 and December 31, 2021, we sold trade accounts receivable totaling $1,589.3 million and $1,102.8 million, respectively, related to these supply chain financing arrangements, of which our customers’ financial institutions applied discount fees totaling $23.3 million and $6.2 million, respectively. To the extent discount fees related to the sale of trade accounts receivable under supply chain financing arrangements are not reimbursed by our customers, they are included in Other income (expense), net. As of December 31, 2022, we had been and/or expected to be fully reimbursed by our customers for a majority of these discount fees. Fair Value Measurements. We apply the fair value hierarchy established by GAAP for the recognition and measurement of certain financial assets and liabilities. An asset or liability’s fair value classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and consider counterparty risk in our assessment of fair value. We also review the underlying inputs that are significant to the fair value measurement of financial instruments to determine if a transfer among hierarchy levels is appropriate. Financial assets and liabilities that we measure at fair value each period include our derivative instruments and equity investments related to our deferred compensation plan (see Note 5 and Note 8). Additionally, we measure at fair value once each year at December 31 the plan assets of our defined benefit pension and postretirement plans including the Salaried VEBA (defined in Note 5). In determining the fair value of the plan assets at an annual period end, we utilize primarily the results of valuations supplied by the investment advisors responsible for managing the assets of each plan, which we independently review for reasonableness. We record our remaining financial assets and liabilities at carrying value. Goodwill is tested for impairment during the fourth quarter on an annual basis, as well as on an interim basis, as warranted, at the time of relevant events and changes in circumstances. Our evaluation of goodwill for impairment involves the comparison of the fair value of each reporting unit to its carrying value. We estimate the fair value of a reporting unit using a combination of an income approach and a market-based approach. Intangible asset fair values and useful lives are determined using the income approach valuation methodology. The income approach incorporates the use of cash flow projections and a discount rate that are developed using market participant-based assumptions. The cash flow projections are based on, among other factors, the expected future period of benefit of the asset, the various characteristics of the asset, long‑term forecasts of the business, market prices, projected cash flows and the rate used in discounting those cash flows. 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, we use 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. See Note 4 for a discussion of our business acquisition, goodwill impairment and intangible asset impairment. For a majority of our remaining non-financial assets and liabilities, which include inventories, debt issuance costs and property, plant and equipment, we are not required to measure their fair value on a recurring basis. However, if certain triggering events occur, an evaluation of the affected non-financial asset or liability will be required, which could result in a reduction to the carrying amount of such asset or liability. See “Property, Plant and Equipment, Net” below for a discussion of impairment charges on idled assets recorded during 2020. See Note 9 for the fair value of our Long-term debt. Government Grants. From time to time, we receive grants from certain governmental agencies such as states and municipalities. We recognize government grants when we have reasonable assurance that we will comply with any conditions attached to the grant and the grant will be received. Government grants related to property, plant and equipment are presented as a reduction to the related asset’s carrying amount. Grants related to compensation for expenses already incurred or for immediate financial support with no future related costs are recognized as income in the period in which they are receivable. The following table presents the total government assistance recognized during the year ended December 31, 2022 (in millions of dollars):
Grantor |  | Grant |  | Amount |  |  | Duration |  | Classification
Tennessee Department of Economic and Community Development |  | TN Fast Track |  | $ | 1.1 |  |  | 2021 - 2028 |  | Property, plant and equipment, net
Tennessee Department of Economic and Community Development |  | TN Fast Track |  |  | 0.2 |  |  | 2021 - 2028 |  | Selling, general, administrative, research and development
Tennessee Valley Authority |  | Performance |  |  | 0.3 |  |  | 2021 - 2026 |  | Property, plant and equipment, net
Indiana Economic Development Corporation |  | IN EDGE Tax Credit |  |  | 1.6 |  |  | 2021 - 2030 |  | Cost of products sold, excluding depreciation and amortization and other items
Indiana Department of Workforce Development |  | Employer Training Grant |  |  | 0.1 |  |  | 2022 |  | Cost of products sold, excluding depreciation and amortization and other items
Total |  |  |  | $ | 3.3 |  |  |  |  |
To be eligible to receive and keep the full amount of the TN Fast Track and Performance grants, we must achieve: (i) minimum cumulative expenditures towards developmental and/or capital expenditures; (ii) a minimum number of new full-time employees; and (iii) a minimum average annual wage, all within seven years of our execution of the grant agreement. To be eligible to receive and keep the full amount of the IN EDGE Tax Credit, we must achieve: (i) minimum cumulative expenditures towards capital expenditures and (ii) a minimum number of full-time employees. Cash and Cash Equivalents. We consider only those short-term, highly liquid investments which, when purchased, have maturities of 90 days or less to be cash equivalents. Our cash equivalents consist primarily of funds in money market funds, which are classified within Level 1 of the fair value hierarchy. Restricted Cash. We are required to keep on deposit certain amounts that are pledged or held as collateral relating to workers’ compensation and other agreements. We account for such deposits as restricted cash (see Note 16). From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash. Available for Sale Securities. We have historically accounted for investments in certain marketable debt securities with maturities of greater than 90 days as available for sale securities. Such securities were recorded at fair value with net unrealized gains and losses, net of income taxes, reflected in Accumulated other comprehensive income (loss) as a component of Stockholders’ equity. Realized gains and losses from the sale of available for sale securities, if any, were determined on a specific identification basis. We settled all outstanding available for sale securities during the year ended December 31, 2020. Trade Receivables and Allowance for Credit Losses. Trade receivables primarily consist of amounts billed to customers for products sold. Accounts receivable are generally due within 30 to 90 days. For the majority of our receivables, we establish an allowance for credit losses based upon collection experience and other factors including, but not limited to, customer credit ratings, bankruptcy filings, published or estimated credit default rates, age of receivables, expected loss rates and collateral exposures. On certain other receivables where we are aware of a specific customer’s inability or reluctance to pay, an allowance for credit losses is established against amounts due, to reduce the net receivable balance to the amount we reasonably expect to collect. However, if circumstances change, our estimate of the recoverability of accounts receivable could be different. Circumstances that could affect our estimates include, but are not limited to, customer credit issues and general economic conditions. Accounts are written off once deemed to be uncollectible. Any subsequent cash collections relating to accounts that have been previously written off are typically recorded as a reduction to total bad debt expense in the period of payment. Write-offs for 2022, 2021 and 2020 were immaterial to our consolidated financial statements. 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. At December 31, 2022 and December 31, 2021, the cost of our inventory on a first-in, first-out (“FIFO”) basis, which approximates the current replacement cost, exceeded its stated LIFO value by $84.6 million and $137.1 million, respectively. Other inventories are stated on the FIFO basis and consist of operating supplies, which are materials and supplies to be consumed during the production process. 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. See Note 2 for the components of inventories. Replacement Parts. Replacement parts consist of preventative maintenance and capital spare parts, which are stated on the FIFO basis. Replacement parts are recorded within Prepaid expenses and other current assets or Other assets depending on whether or not the expected utilization of the replacement parts is to occur within the next 12 months. Property, Plant and Equipment, Net. Property, plant and equipment, net, is recorded at cost and includes construction in progress (see Note 2). Property, plant and equipment acquired in the Warrick (as defined in Note 4) acquisition was recorded at fair value as of the date of acquisition. Interest related to the construction of qualifying assets is capitalized as part of the construction costs (see Note 9). Depreciation is computed using the straight-line method at rates based on the estimated useful lives of the various classes of assets. Depreciable finance lease assets and leasehold improvements are amortized on a straight-line basis over the shorter of the estimated useful lives of the assets or the lease term. The estimated useful lives are as follows:
|  | Range (in years)
Land improvements |  | 1-25
Buildings and leasehold improvements |  | 2-45
Machinery and equipment |  | 1-22
Depreciable finance lease assets |  | 2-120
Depreciation expense is not included in Cost of products sold, but is included in Depreciation and amortization. Property, plant and equipment are 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. We regularly assess whether events and circumstances with the potential to trigger impairment have occurred and rely on a number of factors, including operating results, business plans, economic projections and anticipated future cash flow, to make such assessments. We use an estimate of the future undiscounted cash flows of the related asset or asset group over the estimated remaining life of such asset or asset group in measuring whether the asset or asset group is recoverable. There were no impairment charges in 2022 and 2021. We recorded impairment charges of $0.5 million in 2020 to reflect the scrap value of idled assets we determined not to deploy for future use. Asset impairment charges are included in Other operating charges (income), net, in our Statements of Consolidated (Loss) Income. We classify assets as held for sale only when an asset is being actively marketed and expected to sell within 12 months. Assets held for sale are initially measured at the lesser of the assets’ carrying amount and the fair value less costs to sell. Cloud Computing Implementation Costs. We defer implementation costs associated with a software hosting arrangement that meets the definition of a service contract. We recognize these deferred costs within Prepaid expenses and other current assets and within Other assets on our Consolidated Balance Sheets. When the project is placed into service, we amortize the deferred implementation costs over the term of the hosting arrangement inclusive of expected renewal periods to the same line item in the Statements of Consolidated (Loss) Income as the underlying arrangement. The following table summarizes the total deferred implementation costs and accumulated amortization related to the hosted cloud computing software for our enterprise resource planning system refresh project (in millions of dollars):
|  | As of December 31, |  |  | Average
|  | 2022 |  |  | 2021 |  |  | Useful Life
Deferred implementation costs |  | $ | 10.4 |  |  | $ | 7.8 |  |  | 9 years
Accumulated amortization |  | $ | (1.1 | ) |  | $ | (0.1 | ) |  | n/a
We recorded amortization expense of $1.0 million, $0.1 million and zero in 2022, 2021 and 2020, respectively. Leases. We determine whether an agreement is a lease at inception. We have operating and finance leases for equipment and real estate that primarily have fixed lease payments. For purposes of calculating lease liabilities, options to extend or terminate a lease are included within the lease term when it is reasonably certain that we will exercise such options. Short-term leases with an initial term of 12 months or less are not recorded on our Consolidated Balance Sheets. As most of our leases do not provide an implicit rate, we use information available at the lease commencement date in determining an incremental borrowing rate when calculating our right-of-use lease assets and liabilities. In determining the inputs to the incremental borrowing rate calculation, we make judgments about the value of the leased asset, our credit rating and the lease term, including the probability of our exercising options to extend or terminate the underlying lease. Additionally, we make judgments around contractual asset substitution rights in determining whether a contract contains a lease. We have lease agreements with lease and non-lease components, which are generally accounted for separately. These non-lease components include items such as common area maintenance, taxes and insurance for our real estate leases, as well as maintenance charges related to our equipment leases. We have, however, applied the practical expedient within Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842): Amendments to the Financial Accounting Standards Board Accounting Standards Codification (“ASU 2016-02”), to not separate lease and non-lease components to our embedded supply system equipment leases and have therefore accounted for both lease and non‑lease components in determining the lease assets and liabilities. Many of our equipment leases contain clauses that require us to return the equipment with certain functionality intact. We account for these costs as residual value guarantees when the guarantee becomes probable of being owed. Our lease agreements do not contain any material restrictive covenants. Derivative Financial Instruments. Consistent with guidelines established by management and approved by our Board of Directors, we use derivative financial instruments to mitigate our exposure to changes in the market price of aluminum, certain alloying metals, energy and, to a lesser extent, foreign currency exchange rates. We do not use derivative financial instruments for trading or other speculative purposes. Hedging transactions are executed centrally on behalf of all of our operations to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors. We reflect the fair value of all of our derivative instruments on our Consolidated Balance Sheets. The fair value of hedges settling within one year is included in Prepaid expenses and other current assets or Other accrued liabilities. The fair value of hedges settling beyond one year is included in Other assets or Long-term liabilities. Cash flows related to all of our derivative instruments are reported in our Statements of Consolidated Cash Flows within the same category as the items being hedged. See Note 8 for additional information on our derivative financial instruments. Self Insurance of Workers’ Compensation and Employee Healthcare Liabilities. We self-insure the majority of the costs of workers’ compensation benefits and employee healthcare benefits and rely on insurance coverage to protect us from large losses on individual claims. Workers’ compensation liabilities are based on a combination of estimates for: (i) incurred-but-not-reported claims and (ii) the ultimate expense of incurred claims. Such estimates are based on judgment, using our historical claims data and information and analysis provided by actuarial and claims advisors, our insurance carriers and other professionals. As of December 31, 2020, we revised our methodology of calculating our estimated workers’ compensation liabilities from a discounted basis to an undiscounted basis, resulting in a charge of $0.6 million. Accrued liabilities for employee healthcare benefits, which are estimates of unpaid incurred medical and prescription drug costs as provided by our healthcare administrators, were $7.7 million and $9.0 million at December 31, 2022 and December 31, 2021, respectively. Debt Issuance Costs. Costs incurred in connection with debt financing are deferred and amortized over the estimated term of the related borrowing. Such amortization is included in Interest expense in our Statements of Consolidated (Loss) Income. Unamortized issuance costs are presented within Long-term debt on our Consolidated Balance Sheets (see Note 9). Conditional Asset Retirement Obligations (“CAROs”). We have CAROs at several of our manufacturing facilities. Our CAROs can be separated into two primary categories: (i) legal obligations related to the removal and disposal of asbestos and (ii) asset retirement obligations related to future lease terminations. The majority of our CAROs relate to the first category and 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, roof, piping or equipment insulation) of certain of our older facilities if such facilities were to undergo major renovation or be demolished. We estimate incremental costs for special handling, removal and disposal costs of materials that may or will give rise to CAROs and then discount the expected costs back to the current year using a credit-adjusted, risk-free rate. When it is unclear when or if CAROs will be triggered, we use probability weighting for possible timing scenarios to determine the probability-weighted liability amounts that should be recognized in our consolidated financial statements (see Note 10). Environmental Contingencies. With respect to environmental loss contingencies, we record a loss contingency whenever a contingency is probable and reasonably estimable (see Note 10). 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 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 and other items (“Cost of products sold” or “COGS”) in our Statements of Consolidated (Loss) Income. Environmental expense relating to non-operating locations is included in Selling, general, administrative, research and development (“SG&A and R&D”) in our Statements of Consolidated (Loss) Income. Revenue Recognition. We recognize revenue as we fulfill our performance obligations and transfer control of products to our customers. For products that have an alternative use and/or for which we do not have an enforceable right to payment (including a reasonable profit) during the production process, we recognize revenue at a point in time. For products that have no alternative use and for which we have an enforceable right to payment (including a reasonable profit) throughout the production process, we recognize revenue over time. In general, revenue recognized over time primarily relates to our Aero/HS products and our Automotive Extrusions with the remainder of our products recognized at a point in time. In limited circumstances, we have concluded that we are an agent in certain Packaging end market arrangements. For these transactions, revenue has been recognized on a net basis. For the majority of our business, contracts with customers begin when we acknowledge a purchase order for a specific customer order of product to be delivered in the near term. These purchase orders are short term in nature, although they may reference a longer term “blanket purchase order” or a “terms and conditions” agreement, both of which may span multiple years. For revenue recognized at a point in time, transfer of control usually occurs upon shipment or upon customer receipt of the product, depending on shipping terms. For contracts recognized over time, control transfer occurs incrementally during our production process as progress is made on fulfilling the performance obligation. We use the input method of determining our progress, capturing direct costs beginning at the point that billet or cast ingot is introduced into production at either the extrusion phase or the rolling phase, respectively. We believe the input method more accurately reflects the transfer of control as it represents the best information available of work completed to date for which we have an enforceable right to payment. For products in production, we recognize revenue using estimates of the cost incurred to date plus a reasonable margin. As the duration of our contracts for accounting purposes is typically less than one year, we do not present quantitative information about the aggregate transaction price allocated to unsatisfied performance obligations at the end of the reporting period. We adjust the amount of revenue recognized on all products, regardless of timing of revenue recognition, for variable price consideration, which could include metal market price adjustments, volume rebates and sales discounts. We estimate rebate and discount values based on forecasted order data and historical payment trends for specific customers, adjusted as necessary at each reporting period. Accounts receivable is recorded when our right to consideration becomes unconditional. Payment terms for a majority of our domestic customers are 30 days after invoice date. To accommodate shipping time to overseas locations, payment terms for foreign customers are typically several weeks longer than domestic terms. As such, we do not adjust the promised amount of consideration for the effects of a significant financing component as we do not expect the period between the transfer of control of products to our customers and receipt of payment will be greater than one year. Contract assets primarily relate to our enforceable right to consideration for work completed but not billed at the reporting date on contracts for products recognized over time. Contract assets also include amounts related to our contractual right to consideration for finished goods recognized over time that were in transit as of period end. Incremental Costs of Obtaining a Contract. We expense the costs of obtaining a contract as incurred as the amortization period of the asset that we otherwise would have recognized is one year or less. Shipping and Handling Activities. We account for shipping and handling activities that occur after the customer has obtained control of a product as fulfillment activities (i.e., an expense) rather than as a promised service (i.e., a revenue element). Advertising Costs. Advertising costs, which are included in SG&A and R&D, are expensed as incurred. We had no advertising costs for 2022, and $0.1 million and $0.2 million in 2021 and 2020, respectively. Research and Development Costs. Research and development costs, which are included in SG&A and R&D, are expensed as incurred. Research and development costs for 2022, 2021 and 2020 were $9.3 million, $9.3 million and $9.1 million, respectively. Major Maintenance Activities. All major maintenance costs are accounted for using the direct expensing method. Stock-Based Compensation. Stock-based compensation in the form of service-based awards is provided to executive officers, certain employees and non-employee directors and is accounted for at fair value. We measure 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 grant-date fair value is determined based on the stock price on the date of grant, adjusted for expected dividends or dividend equivalents to be paid during the vesting period. We also grant performance-based awards to executive officers and other key employees. The methodology used to value these performance-based awards is based on the nature of the performance conditions within those awards. Awards that are subject to performance conditions pertaining to total shareholder return (market-based awards) are valued on the date of grant using a Monte Carlo valuation model. The key assumptions in applying this model are an expected volatility and a risk-free interest rate. Awards with certain other performance conditions (non-market-based awards) are valued based on our stock price at the date of grant. Our non‑market-based awards have performance conditions pertaining to our cost performance and adjusted EBITDA margin performance, which is measured by our adjusted earnings before interest, taxes, depreciation and amortization (“Adjusted EBITDA”) as a percentage of Conversion Revenue, which is Net sales less the Hedged Cost of Alloyed Metal. As used in this discussion, “Hedged Cost of Alloyed Metal” is the cost of aluminum at the average Midwest Transaction Price (“Midwest Price”) plus the cost of alloying elements and any realized gains and/or losses on settled hedges related to the metal sold in the referenced period. Holders of performance-based awards receive a one-time payment at the time of issuance of vested shares based on the total dividends they would have received if the vested shares had been held of record from the date of grant through the date of issuance. See Note 7 for more information on our stock-based compensation. The cost of service-based awards, including time-vested restricted stock and performance shares, is recognized as an expense over the requisite service period of the award on a straight-line basis. Adjustments to expense related to forfeitures are recorded in the period in which they occur. For performance shares with performance conditions pertaining to our cost performance and Adjusted EBITDA margin performance, the related expense is updated quarterly by adjusting the estimated number of shares expected to vest based on the most probable outcome of the performance condition (see Note 7). Adoption of New Accounting Pronouncements ASU No. 2021-10, Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance (“ASU 2021-10”) was issued in November 2021. Under ASU 2021-10, the accounting entities with transactions with a government that are accounted for by analogy to a grant or contribution accounting model are required to annually disclose certain information regarding the transaction including: (i) nature and related accounting policy used; (ii) line items on the balance sheet and income statement affected by the transactions; (iii) amounts applicable to each line item; and (iv) significant terms and conditions. We adopted ASU 2021-10 during the year ended December 31, 2022 using a prospective approach. See “Government Grants” above for additional information. In March 2020, the Financial Accounting Standards Board (“FASB”) issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”) and also issued subsequent amendments to the initial guidance (collectively, “Topic 848”). Topic 848 is effective for all entities as of March 12, 2020 through December 31, 2024 and provides optional guidance for contract modifications and certain hedging relationships associated with the transition from reference rates that are expected to be discontinued. During the quarter ended June 30, 2022, we completed the transition of our customers’ supply chain financing contracts from the London Interbank Offered Rate (“LIBOR”) to Term Secured Overnight Financing Rate (“Term SOFR”). Our adoption of Topic 848 did not have a material impact on our consolidated financial statements.

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