10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

[X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2016

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________________________ to_________________________________________

Commission File Number: 0-52105

KAISER ALUMINUM CORPORATION

(Exact name of registrant as specified in its charter)

Delaware		94-3030279
(State of incorporation)		(I.R.S. Employer Identification No.)
27422 Portola Parkway, Suite 200 Foothill Ranch, California		92610-2831
(Address of principal executive offices)		(Zip Code)
	(949) 614-1740
(Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days.                                             Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ	Accelerated filer o
Non-accelerated filer o  (Do not check if a smaller reporting company)	Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

As of April 18, 2016, there were 17,982,909 shares of common stock of the registrant outstanding.

TABLE OF CONTENTS

PART I
Item 1. Financial Statements	1
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	38
Item 3. Quantitative and Qualitative Disclosures About Market Risk	49
Item 4. Controls and Procedures	50
PART II
Item 1. Legal Proceedings	51
Item 1A. Risk Factors	51
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 3. Defaults Upon Senior Securities	51
Item 4. Mine Safety Disclosures	51
Item 5. Other Information	52
Item 6. Exhibits	53
SIGNATURES	54
INDEX OF EXHIBITS	55

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

PART I – FINANCIAL INFORMATION

Item 1.Financial Statements

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

	March 31, 2016			December 31, 2015
	(In millions of dollars, except share and per share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	70.7		$	72.5
Short-term investments	10.0			30.0
Receivables:
Trade receivables – net	138.8			116.7
Other	8.6			6.1
Inventories	210.6			219.6
Prepaid expenses and other current assets1	9.1			56.7
Total current assets	447.8			501.6
Property, plant and equipment – net	504.5			495.4
Deferred tax assets – net1, 2	197.5			163.3
Intangible assets – net	30.1			30.5
Goodwill	37.2			37.2
Other assets1	19.5			19.6
Total	$	1,236.6		$	1,247.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	70.2		$	76.7
Accrued salaries, wages and related expenses	33.9			39.8
Other accrued liabilities	56.5			52.7
Short-term capital leases	0.1			0.1
Total current liabilities	160.7			169.3
Net liabilities of Salaried VEBA	18.7			19.0
Deferred tax liabilities	2.1			2.1
Long-term liabilities	72.5			87.5
Long-term debt1	194.8			194.6
Total liabilities	448.8			472.5
Commitments and contingencies – Note 7
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both March 31, 2016 and December 31, 2015; no shares were issued and outstanding at March 31, 2016 and December 31, 2015	—			—
Common stock, par value $0.01, 90,000,000 shares authorized at both March 31, 2016 and at December 31, 2015; 22,307,219 shares issued and 17,986,521 shares outstanding at March 31, 2016; 22,291,180 shares issued and 18,053,747 shares outstanding at December 31, 2015	0.2			0.2
Additional paid in capital2	1,037.2			1,037.3
Retained earnings2	34.1			15.8
Treasury stock, at cost, 4,320,698 shares at March 31, 2016 and 4,237,433 shares at December 31, 2015, respectively	(252.9		)	(246.5		)
Accumulated other comprehensive loss	(30.8		)	(31.7		)
Total stockholders' equity	787.8			775.1
Total	$	1,236.6		$	1,247.6

____________

¹  See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

²  See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

The accompanying notes to interim consolidated financial statements are an integral part of these statements.

1

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED INCOME (LOSS) (UNAUDITED)

	Quarter Ended
	March 31,
	2016			2015
	(In millions of dollars, except share and per share amounts)
Net sales	$	343.2		$	371.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	262.0			302.3
Lower of cost or market inventory write-down	4.9			—
Unrealized (gain) loss on derivative instruments	(4.0		)	4.5
Depreciation and amortization	8.7			8.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	26.1			22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	0.8			0.6
(Gain) loss on removal of Union VEBA net assets – Note 5	(0.1		)	492.2
Total selling, general, administrative, research and development	26.8			515.5
Total costs and expenses	298.4			830.3
Operating income (loss)	44.8			(458.6		)
Other (expense) income:
Interest expense	(3.7		)	(9.8		)
Other income, net	0.3			0.4
Income (loss) before income taxes	41.4			(468.0		)
Income tax (provision) benefit	(15.1		)	175.8
Net income (loss)	$	26.3		$	(292.2	)
Net income (loss) per common share:
Basic	$	1.47		$	(16.85	)
Diluted	$	1.44		$	(16.85	)
Weighted-average number of common shares outstanding (in thousands):
Basic	17,864			17,344
Diluted	18,200			17,344
Dividends declared per common share	$	0.45		$	0.40

The accompanying notes to interim consolidated financial statements are an integral part of these statements.

2

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED)

	Quarter Ended
	March 31,
	2016			2015
	(In millions of dollars)
Net income (loss)	$	26.3		$	(292.2	)
Other comprehensive income:
VEBAs:
Reclassification adjustments:
Amortization of net actuarial loss	0.1			0.3
Amortization of prior service cost	1.0			0.7
Removal of obligation relating to Union VEBA	—			106.6
Other comprehensive income relating to VEBAs	1.1			107.6
Available for sale securities:
Reclassification of unrealized loss upon sale of available for sale securities	—			0.1
Other comprehensive income relating to available for sale securities	—			0.1
Foreign currency translation gain on Canadian pension plan	0.1			—
Unrealized gain on foreign currency cash flow hedges	0.2			—
Foreign currency translation gain	—			0.1
Other comprehensive income, before tax	1.4			107.8
Income tax expense related to items of other comprehensive income	(0.5		)	(40.9		)
Other comprehensive income, net of tax	0.9			66.9
Comprehensive income (loss)	$	27.2		$	(225.3	)

The accompanying notes to interim consolidated financial statements are an integral part of these statements.

3

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENT OF CONSOLIDATED STOCKHOLDERS' EQUITY (UNAUDITED)

	Common Shares Outstanding		Common Stock		Additional Paid in Capital			Retained Earnings			Treasury Stock			Accumulated Other Comprehensive Loss			Total
	(In millions of dollars, except share and per share amounts)
BALANCE, December 31, 2015	18,053,747		$	0.2	$	1,036.5		$	15.9		$	(246.5	)	$	(31.7	)	$	774.4
Cumulative-effect adjustment1	—		—		0.8			(0.1		)	—			—			0.7
BALANCE, January 1, 2016	18,053,747		$	0.2	$	1,037.3		$	15.8		$	(246.5	)	$	(31.7	)	$	775.1
Net income	—		—		—			26.3			—			—			26.3
Other comprehensive income, net of tax	—		—		—			—			—			0.9			0.9
Issuance of common shares to employees upon vesting of restricted stock units and performance shares	51,373		—		—			—			—			—			—
Cancellation of employee non-vested shares	(172	)	—		—			—			—			—			—
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(35,162	)	—		(2.7		)	—			—			—			(2.7		)
Repurchase of common stock	(83,265	)	—		—			—			(6.4		)	—			(6.4		)
Cash dividends on common stock ($0.45 per share)	—		—		—			(8.2		)	—			—			(8.2		)
Amortization of unearned equity compensation	—		—		2.6			—			—			—			2.6
Dividends on unvested equity awards that were canceled	—		—		—			0.2			—			—			0.2
BALANCE, March 31, 2016	17,986,521		$	0.2	$	1,037.2		$	34.1		$	(252.9	)	$	(30.8	)	$	787.8

____________

^1.  See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

The accompanying notes to interim consolidated financial statements are an integral part of these statements.

4

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED)

	Three Months Ended
	March 31,
	2016			2015
	(In millions of dollars)
Cash flows from operating activities:
Net income (loss)	$	26.3		$	(292.2	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property, plant and equipment	8.3			7.6
Amortization of definite-lived intangible assets	0.4			0.4
Amortization of debt discount and debt issuance costs	0.3			3.2
Deferred income taxes – Note 4	15.1			(176.7		)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest1	—			(1.0		)
Non-cash equity compensation1	2.6			2.1
Lower of cost or market write-down	4.9			—
Non-cash unrealized (gain) loss on derivative instruments	(4.0		)	4.5
Non-cash defined benefit net periodic benefit cost relating to Salaried VEBA	0.8			0.6
Non-cash loss on removal of Union VEBA net assets2	—			446.7
Other non-cash changes in assets and liabilities	0.3			0.3
Changes in operating assets and liabilities:
Trade and other receivables	(24.6		)	(18.3		)
Inventories, excluding lower of cost or market write-down	4.1			(3.3		)
Prepaid expenses and other current assets	(2.2		)	(2.4		)
Accounts payable	1.9			0.4
Accrued liabilities2	21.2			19.1
Annual variable cash contributions to VEBAs2	(19.5		)	(13.7		)
Long-term assets and liabilities, net2	(14.6		)	30.1
Net cash provided by operating activities	21.3			7.4
Cash flows from investing activities3:
Capital expenditures	(25.9		)	(11.3		)
Proceeds from disposition of available for sale securities	20.0			84.0
Net cash (used in) provided by investing activities	(5.9		)	72.7
Cash flows from financing activities3:
Payment of capital lease liability	—			(0.1		)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	—			1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.7		)	(2.5		)
Repurchase of common stock	(6.3		)	(28.2		)
Cash dividends paid to stockholders	(8.2		)	(7.1		)
Net cash used in financing activities	(17.2		)	(36.9		)
Net (decrease) increase in cash and cash equivalents during the period	(1.8		)	43.2
Cash and cash equivalents at beginning of period	72.5			177.7
Cash and cash equivalents at end of period	$	70.7		$	220.9

____________

¹  See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09.

²  See Note 5 for the impact of removing the Union VEBA (defined in Note 5) net assets.

³  See Note 12 for the supplemental disclosure on non-cash transactions.

The accompanying notes to interim consolidated financial statements are an integral part of these statements.

5

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

1. 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, 2015. Unless the context otherwise requires, references in these notes to interim consolidated financial statements - unaudited to "Kaiser Aluminum Corporation," "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 products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength, automotive, general engineering and other industrial end market applications. Our business is organized into one operating segment, Fabricated Products. See Note 11 for additional information regarding our reportable segment and business unit.

Principles of Consolidation and Basis of Presentation. The accompanying unaudited 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") applicable for interim periods and, therefore, do not include all information and footnotes required by GAAP for complete financial statements. In management's opinion, all adjustments (which include normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for our interim periods are not necessarily indicative of the results of operations that may be achieved for the entire 2016 fiscal year. The financial information as of December 31, 2015 is derived from our audited consolidated financial statements and footnotes for the year ended December 31, 2015 included in our Annual Report on Form 10-K. See New Accounting Pronouncements below for a discussion of new accounting pronouncements we adopted during the quarter ended March 31, 2016 requiring cumulative-effect adjustments that impacted our consolidated financial statements and footnotes for the year ended December 31, 2015.

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.

Inventories. Inventories are stated at the lower of cost or market value. On March 31, 2016, we recorded an inventory write-down of $4.9 million to reflect the net realizable value as of that date. The net realizable value reflected commitments as of that date from customers to purchase our inventory at prices that exceeded the Midwest Transaction Price ("Midwest Price"), which reflects the primary aluminum supply/demand dynamics in North America, reduced by an approximate normal profit margin. If we encounter a further decrease in our net realizable value of inventory, we may be subject to additional inventory lower of cost or market value adjustments.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At March 31, 2016, after adjusting for the inventory write down discussed above, the stated LIFO value of the inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $17.7 million. Additionally, during the quarter ended March 31, 2016, we decremented a prior year, higher cost LIFO layer, which resulted in an insignificant charge. The excess of current cost over the stated LIFO value of inventory at December 31, 2015 was $24.1 million. 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 our inventories at March 31, 2016 and December 31, 2015 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 $0.9 million and $0.3 million during the quarters ended March 31, 2016 and March 31, 2015, respectively.

6

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

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 and other items, but is included in Depreciation and amortization on the Statements of Consolidated Income (Loss). For the quarters ended March 31, 2016 and March 31, 2015, we recorded depreciation expense of $8.2 million and $7.5 million, respectively, relating to our operating facilities in the Fabricated Products segment. An immaterial amount of depreciation expense was also recorded within All Other for all periods presented in this Report.

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.

Foreign Currency Risk Management. From time to time, we enter into foreign currency forward contracts to protect the value of anticipated foreign currency expenses associated with cash commitments for equipment purchases. These derivative instruments are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. Both realized and unrealized periodic gains and losses of derivative instruments designated as cash flow hedges are deferred in Accumulated other comprehensive income until depreciation on the underlying equipment commences. Upon commencement, realized gains and losses are recorded in Net income (loss) as an adjustment to depreciation expense in the period in which depreciation is recognized on the underlying equipment. Depending on the time to maturity and asset or liability position, the carrying values of cash flow hedges are included in Prepaid expenses and other current assets, Other assets, Other accrued liabilities or Long-term liabilities. We report the effective portion of our cash flow hedges in the same financial statement line item as changes in the fair value of the hedged item.

In order to qualify for hedge accounting treatment, derivative instruments must be effective at reducing the risk associated with the exposure being hedged and must be designated as a hedge at the inception of the instrument contract. Hedge effectiveness is assessed periodically. Any derivative instrument not designated as a hedge, or so designated but ineffective, is adjusted to market value and recognized in net income immediately. If a cash flow hedge ceases to qualify for hedge accounting treatment, the derivative instrument would continue to be carried on the balance sheet at fair value until settled and future adjustments to the derivative instrument's fair value would be recognized in Net income (loss) immediately. If a forecasted equipment purchase was no longer probable to occur, amounts previously deferred in Accumulated other comprehensive income (loss) would be recognized immediately in Net income (loss). See Note 8 for additional information.

We are exposed to counterparty credit risk on all of our derivative instruments. Accordingly, we have established and maintained strict counterparty credit guidelines and entered into hedges only with major financial institutions that are investment grade or better. We do not have significant exposure to any one counterparty and management believes the risk of loss is remote and in any event would not be material. Additionally, we do not require collateral under these agreements.

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs("ASU 2015-03"), was issued in April 2015. ASU 2015-03 requires debt issuance costs related to a recognized debt liability to be presented in an entity's balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts, instead of being presented as a deferred charge in the balance sheet. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-03. During the quarter ended March 31, 2016, we retrospectively adopted ASU 2015-03, which resulted in a reclassification of $3.2 million of debt issuance costs related to our Senior Notes (as defined in Note 3) from Other assets to Long-term debt as of December 31, 2015.

ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements ("ASU 2015-15") was issued in August 2015 to address the presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-15. Our adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) ("ASU 2015-07"), was issued in May 2015. This ASU removes the requirement to categorize within the fair value hierarchy table investments without readily determinable fair values in entities that elect to measure fair value using net asset value per share ("NAV") or its equivalent. ASU 2015-07 requires that these investments continue to be shown in the fair value disclosure in order to allow the disclosure to reconcile to the investment amount presented in the balance sheet. Our retrospective adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

7

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), was issued in August 2015. ASU 2015-14 defers the effective date of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was issued in May 2014 and requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, by one year for all entities and permits early adoption on a limited basis. We expect to adopt ASU 2014-09 for the fiscal year ending December 31, 2018 and will continue to assess the impact of the adoption on our consolidated financial statements; however, based on our assessments to date, we do not expect the adoption of this ASU to have a material impact on our consolidated financial statements.

ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes ("ASU 2015-17"), was issued in November 2015. ASU 2015-17 requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. This ASU does not, however, change the existing requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount. During the quarter ended March 31, 2016, we early adopted this ASU on a prospective basis. As such, prior periods were not retrospectively adjusted.

ASU No. 2016-02, Leases (Topic 842): Amendments to the Financial Accounting Standards Board Accounting Standards Codification ("ASU 2016-02"), was issued in February 2016. Under ASU 2016-02, lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). For income statement purposes, a dual model was retained, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). ASU 2016-02 becomes effective for us in the first quarter of 2019. We are currently evaluating whether to early adopt the standard and what impact it will have on our consolidated financial statements, which we expect will be material.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), was issued in March 2016. ASU 2016-09 eliminates additional paid in capital ("APIC") pools and requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. The accounting for an employee's use of shares to satisfy the employer's statutory income tax withholding obligation and the accounting for forfeitures is also changing. ASU 2016-09 becomes effective for us in the first quarter of 2017. We early adopted ASU 2016-09 during the quarter ended March 31, 2016. See Note 4 and Note 6 for a discussion on the impact of our adoption of ASU 2016-09.

2. Supplemental Balance Sheet Information

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	34.5		$	40.3
Commercial paper	36.2			32.2
Total	$	70.7		$	72.5
Trade Receivables – Net
Billed trade receivables	$	139.4		$	116.8
Unbilled trade receivables	0.2			0.7
Trade receivables, gross	139.6			117.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables – net	$	138.8		$	116.7
Inventories
Finished products	$	66.8		$	79.5
Work-in-process	73.4			63.6

8

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Raw materials	46.7			53.4
Operating supplies and repair and maintenance parts	23.7			23.1
Total	$	210.6		$	219.6
Prepaid Expenses and Other Current Assets
Current derivative assets – Notes 8 and 9	$	1.4		$	1.5
Current deferred tax assets1	—			49.6
Prepaid taxes	3.3			—
Prepaid insurance	1.1			1.9
Short-term restricted cash	0.3			0.3
Other	3.0			3.4
Total	$	9.1		$	56.7
Property, Plant and Equipment – Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	72.5			71.8
Machinery and equipment	559.3			549.0
Construction in progress	54.8			48.5
Property, plant and equipment – gross	709.3			692.0
Accumulated depreciation	(205.1		)	(196.9		)
Assets held for sale	0.3			0.3
Property, plant and equipment – net	$	504.5		$	495.4
Other Assets
Restricted cash	$	10.9		$	10.9
Deferred financing costs on Revolving Credit Facility	1.1			1.3
Deferred compensation plan assets	7.3			7.3
Derivative assets – Notes 8 and 9	0.2			0.1
Total	$	19.5		$	19.6
Other Accrued Liabilities
Current derivative liabilities – Notes 8 and 9	$	10.3		$	14.1
Uncleared cash disbursements	10.0			8.0
Accrued income taxes and taxes payable	8.6			3.1
Accrued annual contribution to VEBAs	—			19.6
Accrued contingent contribution to Union VEBA – Note 5	17.1			—
Short-term environmental accrual – Note 7	1.3			1.6
Accrued interest	5.5			1.5
Short-term deferred revenue	0.8			1.2
Other	2.9			3.6
Total	$	56.5		$	52.7

9

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	March 31, 2016		December 31, 2015
	(In millions of dollars)
Long-Term Liabilities
Derivative liabilities – Notes 8 and 9	$	1.7	$	2.1
Income tax liabilities	0.8		0.7
Workers' compensation accruals	24.1		21.7
Long-term environmental accrual – Note 7	16.8		17.0
Long-term asset retirement obligations	4.9		4.8
Deferred compensation liability	7.8		7.7
Long-term deferred revenue	0.3		0.3
Long-term capital leases	0.1		0.1
Long-term portion of contingent contribution to Union VEBA – Note 5	12.8		29.9
Other long-term liabilities	3.2		3.2
Total	$	72.5	$	87.5

____________

¹  See Note 4 for discussion of our adoption of ASU 2015-17.

3. Debt and Credit Facility

Senior Notes

In May 2012, we issued $225.0 million principal amount of 8.25% unsecured senior notes due June 1, 2020 ("Senior Notes") at 100% of the principal amount. During 2015, we repurchased $27.2 million aggregate principal amount of our Senior Notes for 107.5% of the face value. As of both March 31, 2016 and December 31, 2015, $197.8 million aggregate principal amount of our Senior Notes remained outstanding. Interest expense, including amortization of deferred financing costs, relating to the Senior Notes was $4.3 million and $4.8 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. A portion of the interest relating to the Senior Notes was capitalized as construction in progress. We may redeem the Senior Notes at our option in whole or part at any time on or after June 1, 2016 at a redemption price of 104.125% of the principal amount, declining to 102.0625% of the principal amount on or after June 1, 2017 and declining further to 100% of the principal amount on or after June 1, 2018, in each case plus any accrued and unpaid interest.

The fair value of the outstanding Senior Notes at March 31, 2016 and December 31, 2015 was approximately $205.7 million and $207.3 million, respectively. See Note 9 for information relating to the estimated fair value of the Senior Notes.

Revolving Credit Facility

Our credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the other financial institutions party thereto ("Revolving Credit Facility") provides us with a $300.0 million funding commitment through December 2020. We had $299.1 million of borrowing availability under the Revolving Credit Facility at March 31, 2016, based on the borrowing base determination then in effect. At March 31, 2016, there were no borrowings under the Revolving Credit Facility and $7.3 million was being used to support outstanding letters of credit, leaving $291.8 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 3.75% at March 31, 2016.

10

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

4. Income Tax Matters

The provision for (benefit from) incomes taxes for each period presented consisted of the following (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Domestic	$	14.9	$	(175.8	)
Foreign	0.2		—
Total	$	15.1	$	(175.8	)

The income tax provision (benefit) for the quarters ended March 31, 2016 and March 31, 2015 was $15.1 million and $(175.8) million, reflecting an effective tax rate of 36.5% and 37.6%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2016 was due to (i) a decrease of $0.7 million for the recognition of excess tax benefits from stock compensation, resulting in a 1.7% decrease to the blended statutory tax rate, which was partially offset by (ii) an increase of $0.3 million to the valuation allowance for certain state net operating losses, resulting in a 0.7% increase to the blended statutory tax rate. There was no material difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2015.

The $175.8 million income tax benefit for the quarter ended March 31, 2015 included a $184.4 million tax benefit that was recorded as a result of removing the Union VEBA net assets and related deferred tax liabilities from our consolidated financial statements. See Note 5 for disclosure regarding employee benefits.

Our gross unrecognized benefits relating to uncertain tax positions were $1.7 million at March 31, 2016 and December 31, 2015, respectively, of which, $0.6 million would be recorded through our income tax provision and thus impact the effective tax rate at March 31, 2016 and December 31, 2015, respectively, if the gross unrecognized tax benefits were to be recognized.

We do not expect our gross unrecognized tax benefits to significantly change within the next 12 months.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, was issued and early adopted in March 2016. ASU 2016-09 eliminates additional paid in capital ("APIC") pools and requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. In addition, modified retrospective adoption of ASC 2016-09 eliminates the requirement that excess tax benefits be realized (i.e., through a reduction in income taxes payable) before we can recognize them and therefore, we have recorded a cumulative-effect adjustment of $0.7 million through Retained earnings and Deferred tax assets – net during the quarter ended March 31, 2016 to record excess tax benefits not previously recognized.

5. Employee Benefits

Pension and Similar Benefit Plans. We provide contributions to: (i) multi-employer pension plans sponsored by the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union AFL-CIO, CLC ("USW") and the International Association of Machinists and certain other unions at certain of our production facilities; (ii) defined contribution 401(k) savings plans for hourly bargaining unit employees and salaried and certain hourly non-bargaining unit employees; (iii) a defined benefit plan for salaried employees at our London, Ontario (Canada) facility; and (iv) a non-qualified, unfunded, unsecured plan of deferred compensation for key employees who would otherwise suffer a loss of benefits under our defined contribution plan.

VEBA Postretirement Obligations. Certain eligible retirees participate in a voluntary employees' beneficiary association ("VEBA") that provides healthcare and medical cost reimbursement benefits for eligible retirees represented by certain unions and their surviving spouse and eligible dependents (the "Union VEBA") or a VEBA that provides healthcare related benefits for certain other eligible retirees and their surviving spouse and eligible dependents (the "Salaried VEBA" and, together with the Union VEBA, "VEBAs"). The Union VEBA covers certain qualifying bargaining unit retirees and future retirees. The Salaried VEBA covers certain retirees who retired prior to the 2004 termination of the prior plan and employees who were hired prior to February 2002 and have subsequently retired or will retire with the requisite age and service.

Our primary financial obligation to the VEBAs is to make an annual variable cash contribution based on the contribution formula discussed in Note 6 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for

11

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

the year ended December 31, 2015. The variable cash contribution obligation to the Union VEBA expires in September 2017, while the obligation to the Salaried VEBA has no express termination date. The variable contribution for 2015 was $19.5 million (comprised of $16.7 million to the Union VEBA and $2.8 million to the Salaried VEBA). These amounts were paid during the first quarter of 2016. We treat the Salaried VEBA as a defined benefit plan in our financial statements.

In the quarter ended March 31, 2015, after determining that our obligation to make annual variable contributions to the Union VEBA would expire as of September 2017, we terminated defined benefit plan accounting for the Union VEBA. This resulted in a non-cash loss of $307.8 million, net of a $184.4 million tax benefit, as we removed the Union VEBA net assets and related deferred tax liabilities from our Consolidated Balance Sheet. We have recorded the estimated liability for the remaining variable cash contributions in Other accrued liabilities and Long-term liabilities (see Note 2). Our aggregate estimate of $29.9 million for the amounts due for the 2016 variable cash contribution (to be paid in 2017) and the variable contribution for the first nine months of 2017 (to be paid in 2018) is subject to change based on our actual cash flow for each respective calendar year. We review the estimated liability quarterly and reflect any changes in our Operating income (loss).

Components of Net Periodic Benefit Cost. Our results of operations included the following impacts associated with the Canadian defined benefit plan and the Salaried VEBA: (a) charges for service rendered by employees; (b) a charge for accretion of interest; (c) a benefit for the return on plan assets; and (d) amortization of net gains or losses on assets, prior service costs associated with plan amendments and actuarial differences. Net periodic benefit cost related to the Canadian defined benefit plan was not material for the quarters ended March 31, 2016 and March 31, 2015. The following table presents the components of net periodic benefit cost for the Salaried VEBA and charges relating to all other employee benefit plans for the periods presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Salaried VEBA:
Service cost1	$	—		$	—
Interest cost	0.7			0.7
Expected return on plan assets	(1.0		)	(1.1		)
Amortization of prior service cost	1.0			0.7
Amortization of net actuarial loss	0.1			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	0.8			0.6
(Gain) loss on removal of Union VEBA net assets	(0.1		)	492.2
Other employee benefit plans:
Deferred compensation plan	0.1			0.4
Defined contribution plans	4.0			4.0
Multiemployer pension plans	1.1			0.9
Total other employee benefit plans	$	5.2		$	5.3
Total	$	5.9		$	498.1

____________

¹  The service cost was insignificant for all periods presented.

The following table presents the allocation of the charges (income) detailed above, by reportable segment and business unit (in millions of dollars – see Note 11):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	4.7	$	4.6
All Other	1.2		493.5
Total	$	5.9	$	498.1

12

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

For all periods presented, Net periodic postretirement benefit cost relating to the Salaried VEBA and the (Gain) loss on removal of Union VEBA net assets were included within All Other. Further, substantially all of the Fabricated Products segment's employee benefits related charges are in Cost of products sold, excluding depreciation and amortization and other items with the remaining balance in Selling, general, administrative, research and development ("SG&A and R&D").

6. Employee Incentive Plans

Short-Term Incentive Plans ("STI Plans")

We have annual short-term incentive compensation plans for senior management and certain other employees payable at our election in cash, shares of common stock, or a combination of cash and shares of common stock. Amounts earned under STI Plans are based on our adjusted earnings before interest, taxes, depreciation and amortization ("Adjusted EBITDA"), modified for certain safety, quality, delivery, cost and individual performance factors. The Adjusted EBITDA targets are determined based on the economic value added ("EVA") of our Fabricated Products business. Most of our production facilities have similar programs for both hourly and salaried employees. As of March 31, 2016, we had a liability of $4.9 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the first quarter performance period of our 2016 STI Plans.

Long-Term Incentive Programs ("LTI Programs")

General. Executive officers and other key employees of the Company, as well as non-employee directors of the Company, are eligible to participate in the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan (as amended, "Equity Incentive Plan"). Subject to certain adjustments that may be required from time to time to prevent dilution or enlargement of the rights of participants under the Equity Incentive Plan, a total of 2,722,222 common shares have been authorized for issuance under the Equity Incentive Plan. At March 31, 2016, 603,810 common shares were available for additional awards under the Equity Incentive Plan.

Non-vested Common Shares and Restricted Stock Units. We grant non-vested common shares and restricted stock units to our non-employee directors, executive officers and other key employees. The restricted stock units have rights similar to the rights of non-vested common shares and each restricted stock unit that becomes vested entitles the recipient to receive one common share. For both non-vested common shares and restricted stock units, the service period is generally one year for non-employee directors and three years for executive officers and other key employees.

In addition to non-vested common shares and restricted stock units, we grant performance shares to executive officers and other key employees. Each performance share that becomes vested entitles the recipient to receive one common share. Performance shares granted in 2014 and 2015 ("TSR-Based Performance Shares") are subject to performance conditions pertaining to our total shareholder return ("TSR") over a three-year performance period compared to the TSR of a specified group of peer companies. The number of TSR-Based Performance Shares that will ultimately vest under both the 2014-2016 and 2015-2017 LTI Plans and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares (constituting approximately one-half of the maximum payout) and depends on the percentile ranking of our TSR compared to the group of peer companies. Performance shares granted in 2016 consist of TSR-Based Performance Shares and performance shares subject to performance requirements ("CP-Based Performance Shares") pertaining to our cost performance as set forth in the 2016 LTI Program. The number of CP-Based Performance Shares that will ultimately vest and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares (constituting approximately one-half of the maximum payout) and depends on the average annual cost performance achieved for the specified three-year performance period.

During the first quarter of 2016, performance shares granted in 2013 ("EVA-Based Performance Shares") under the 2013-2015 LTI Program became fully vested (see "Summary of Activity" below). The EVA-Based Performance Shares were subject to performance conditions pertaining to our EVA performance, measured over the three-year performance period. The number of EVA-Based Performance Shares that vested and resulted in the issuance of common shares was dependent on the average annual EVA achieved for the specified three-year performance period.

The vesting of performance shares resulting in the issuance and delivery of common shares, if any, under the 2014-2016 and 2015-2017 LTI Programs will occur in 2017 and 2018, respectively.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, was issued and early adopted in March 2016. ASU 2016-09 eliminates the requirement to estimate and apply a forfeiture rate to reduce stock compensation expense during the vesting period and, instead, account for forfeitures as they

13

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

occur. ASU 2016-09 requires that this change be adopted using the modified retrospective approach. As such, we recorded a cumulative-effect adjustment of $0.8 million during the quarter ended March 31, 2016 to reduce our December 31, 2015 Retained earnings and increase our December 31, 2015 Additional paid in capital balances. Additionally, ASU 2016-09 addresses the presentation of excess tax benefits and employee taxes paid on the statement of cash flows. We are now required to present excess tax benefits as an operating activity (combined with other income tax cash flows) on the statement of cash flows rather than as a financing activity, and we have adopted this change prospectively. ASU 2016-09 also requires the presentation of employee taxes as a financing activity on the statement of cash flows, which is where we had previously classified these items. This change, therefore, did not impact our financial statements.

Non-Cash Compensation Expense. Compensation expense relating to all awards under the Equity Incentive Plan is included in SG&A and R&D. Non-cash compensation expense by type of award under LTI Programs was as follows for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares and restricted stock units	$	1.1	$	1.1
EVA-Based Performance Shares	0.3		0.4
TSR-Based Performance Shares	1.1		0.6
CP-Based Performance Shares	$	0.1	$	—
Total non-cash compensation expense	$	2.6	$	2.1

The following table presents the allocation of the charges detailed above, by segment (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	0.8	$	0.7
All Other	1.8		1.4
Total non-cash compensation expense	$	2.6	$	2.1

Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of March 31, 2016:

	Unrecognized gross compensation costs (in millions of dollars)		Expected period (in years) over which the remaining gross compensation costs will be recognized
Non-vested common shares and restricted stock units	$	8.3	2.3
CP-Based Performance Shares	$	4.7	2.9
TSR-Based Performance Shares	$	10.5	2.2

Summary of Activity. A summary of the activity with respect to non-vested common shares, restricted stock units, EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares for the quarter ended March 31, 2016 is as follows:

14

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	Non-Vested Common Shares				Restricted Stock Units				EVA-Based Performance Shares				CP-Based Performance Shares				TSR-Based Performance Shares
	Shares		Weighted-Average Grant-Date Fair Value per Share		Units		Weighted-Average Grant-Date Fair Value per Unit		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2015	156,553		$	67.20	5,521		$	66.64	155,105		$	57.76	—		$	—	299,877		$	89.43
Granted1	—		—		52,705		74.49		—		—		63,983		80.46		95,974		93.02
Vested	(38,812	)	60.75		(1,762	)	63.18		(49,611	)	57.76		—		—		—		—
Forfeited1	(172	)	68.99		(165	)	74.49		—		—		(164	)	80.46		(1,115	)	90.06
Canceled1	—		—		—		—		(105,494	)	57.76		—		—		—		—
Outstanding at March 31, 2016	117,569		$	69.33	56,299		$	74.07	—		$	—	63,819		$	80.46	394,736		$	90.30

____________

¹  For EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares, the number of shares granted and forfeited are presented at their maximum payout; and the number of shares canceled includes the number of shares that did not vest due to EVA performance results falling below those required for maximum payout.

The weighted-average grant-date fair value per share for shares granted by type of award was as follows for each period presented:

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares	$	—	$	69.83
Restricted stock units	$	74.49	$	69.83
CP-Based Performance Shares	$	80.46	$	—
TSR-Based Performance Shares	$	93.02	$	95.68

Stock Options. We had 16,645 fully-vested stock options outstanding as of March 31, 2016 and December 31, 2015, in each case exercisable to purchase common shares at $80.01 per share and having a remaining contractual life of 1.00 and 1.25 years, respectively. During the quarter ended March 31, 2016, no options were granted, exercised or forfeited.

Vested Stock. From time to time, we issue common shares to non-employee directors electing to receive common shares in lieu of all or a portion of their annual retainer fees. The fair value of these common shares is based on the fair value of the shares at the date of issuance and is immediately recognized in Net income (loss) as a period expense. Such shares are generally issued during the second quarter of each fiscal year.

Under the Equity Incentive Plan, participants may elect to have us withhold common shares to satisfy minimum statutory tax withholding obligations arising in connection with the exercise of stock options and vesting of non-vested shares, restricted stock units and performance shares. We cancel any such shares withheld on the applicable vesting dates or earlier dates when service requirements are satisfied, which correspond to the times at which income to the employee is recognized. When we withhold these common shares, we are required to remit to the appropriate taxing authorities the fair value of the shares withheld as of the vesting date. During the quarters ended March 31, 2016 and March 31, 2015, 35,162 and 33,628 common shares, respectively, were withheld and canceled for this purpose. The withholding of common shares by us could be deemed a purchase of the common shares.

15

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

7. Commitments and Contingencies

Commitments. We have a variety of financial commitments, including purchase agreements, forward foreign exchange and forward sales contracts, indebtedness and letters of credit (see Note 3 and Note 8).

There were no material changes to our scheduled minimum rental commitments and purchase obligations during the quarter ended March 31, 2016.

Environmental Contingencies. We are subject to a number of environmental laws and regulations, to potential fines or penalties assessed for alleged breaches of such laws and regulations and to potential claims based upon such laws and regulations.

We have established procedures for regularly evaluating environmental loss contingencies. Our environmental accruals represent our undiscounted estimate of costs reasonably expected to be incurred based on presently enacted laws and regulations, existing requirements, currently available facts, existing technology and our assessment of the likely remediation actions to be taken.

In 2012, we submitted a final feasibility study to the Washington State Department of Ecology ("Washington State Ecology") that included recommendations for remediation alternatives primarily to address the historical use of oils containing polychlorinated biphenyls ("PCBs") at our Spokane, Washington (“Trentwood”) facility. We also signed an amended work order in 2012 with Washington State Ecology allowing certain remediation activities to begin, including the initiation of a treatability study in regards to proposed PCB remediation methods. We began implementation of certain approved sections of the work plan in 2013 and throughout 2014, completing a number of these sections in 2014 and receiving approval from Washington State Ecology. Also in cooperation with Washington State Ecology, we began construction of a pilot test facility to implement the treatability study and evaluate the feasibility of removing PCBs from ground water under the Trentwood facility. As pilot testing has only begun and the success of the new methodology cannot be reasonably determined at this time, it is possible that we may need to make upward adjustments to our related accruals as facts and cost estimates regarding the groundwater treatment method become available. 

During 2013, at the request of the Ohio Environmental Protection Agency ("OEPA"), we initiated an investigational study of the Newark, Ohio (“Newark”) facility related to historical on-site waste disposal. Since 2014, we completed a number of preliminary steps in the preparation of completing the final risk assessment and feasibility study, both of which are subject to review and approval by the OEPA. As work continues and progresses to a final risk assessment and feasibility study, we will establish and update estimates for probable and estimable remediation, if any. The actual and final cost for remediation will not be fully determinable until a final feasibility study is submitted and accepted by the OEPA and work plans are prepared, which is expected to occur in the next nine to 15 months.

At March 31, 2016, our environmental accrual of $18.1 million represented our estimate of the incremental remediation cost based on: (i) proposed alternatives in the final feasibility study related to the Trentwood facility; (ii) currently available facts with respect to our Newark facility; and (iii) facts related to certain other locations owned or formerly owned by us. In accordance with approved and proposed remediation action plans, we expect that the implementation and ongoing monitoring could occur over a period of 30 or more years.

As additional facts are developed, feasibility studies are completed, draft remediation plans are modified, necessary regulatory approvals for the implementation of remediation are obtained, alternative technologies are developed, and/or other factors change, there may be revisions to management's estimates and actual costs may exceed the current environmental accruals. We believe at this time that it is reasonably possible that undiscounted costs associated with these environmental matters may exceed current accruals by amounts that could be, in the aggregate, up to an estimated $24.7 million over the remediation period. It is reasonably possible that our recorded estimate will change in the next 12 months.

Other Contingencies. We are party to various lawsuits, claims, investigations and administrative proceedings that arise in connection with past and current operations. We evaluate such matters on a case-by-case basis, and our policy is to vigorously contest any such claims we believe are without merit. We accrue for a legal liability when it is both probable that a liability has been incurred and the amount of the loss is material and reasonably estimable. Quarterly, in addition to when changes in facts and circumstances require it, we review and adjust these accruals to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular case. While uncertainties are inherent in the final outcome of such matters and it is presently impossible to determine the actual cost that may ultimately be incurred, we believe that we have sufficiently accrued for such matters and that the ultimate resolution of pending matters will not have a material impact on our consolidated financial position, operating results, or liquidity.

16

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

8. Derivative Financial Instruments and Related Hedging Programs

Overview. In conducting our business, we enter into derivative transactions, including forward contracts and options, to limit our economic (i.e. cash) exposure resulting from: (i) metal price risk related to our sale of fabricated aluminum products and the purchase of metal used as raw material for our fabrication operations; (ii) energy price risk relating to fluctuating prices of natural gas and electricity used in our production processes; and (iii) foreign currency requirements with respect to our foreign subsidiaries and cash commitments for equipment purchases denominated in foreign currency.

Our derivative activities are overseen by a hedging committee ("Hedging Committee"), which is composed of our chief executive officer, chief operating officer, chief financial officer, chief accounting officer, treasurer and vice president of commodity risk management and other officers and employees selected by the chief executive officer.The Hedging Committee meets regularly to review derivative positions and strategy and reports to our Board of Directors on the scope of its activities.

Hedges of Operational Risks

Designated Foreign Currency Cash Flow Hedges. We are exposed to foreign currency exchange risk related to firm-price agreements for equipment purchases from foreign manufacturers. Such agreements require that we make payments in foreign currency to the vendor over time based on milestone achievements. We use foreign currency forward contracts in order to mitigate the exposure to currency exchange rate fluctuations related to these purchases. The timing and amounts of the forward contract settlements are designed to line up with the timing and amounts of scheduled payments to the foreign equipment manufacturers and are therefore expected to be highly effective hedges. As of March 31, 2016, we had open forward contracts designated as cash flow hedges to purchase euros with maturity dates between two months and 17 months. The notional amounts of these foreign currency forward contracts totaled 4.0 million euros and 4.7 million euros at March 31, 2016 and December 31, 2015, respectively, with an average contract exchange rate of 1.14 euro to US dollar for both periods. The effective portion of the fair value on these instruments is recorded within Other comprehensive income (loss) and is reclassified into the Statements of Consolidated Income (Loss) on the same line item and the same period in which the underlying equipment is depreciated. We had no such reclassifications into Net income (loss) during the quarter ended March 31, 2016 and anticipate no material such reclassifications for the next 12 months. For the quarter ended March 31, 2016, we recorded an unrealized gain of $0.2 million on the effective portions of our designated foreign currency cash flow hedges, resulting in an ending loss in Accumulated other comprehensive loss related to the cash flow hedges of $0.1 million at March 31, 2016. We incurred no ineffectiveness on these hedges during the quarter ended March 31, 2016. There were no forward contracts designated as cash flow hedges during the quarter ended March 31, 2015.

Non-Designated Hedges of Operational Risks. Our pricing of fabricated aluminum products is generally intended to lock in a conversion margin (representing the value added from the fabrication process(es)) and to pass through metal price fluctuations to our customers. For some of our higher value added products sold on a spot basis, the pass through of metal price movements can sometimes lag by as much as several months, with a favorable impact to us when metal prices decline and an adverse impact to us when metal prices increase. Additionally, in certain instances, we enter into firm-price arrangements with our customers for stipulated volumes to be delivered in the future. Because we generally purchase primary and secondary aluminum on a floating price basis, the lag in passing through metal price movements to customers on some of our higher value added products sold on a spot basis and the volume that we have committed to sell to our customers under a firm-price arrangement create metal price risk for us. We use third-party hedging instruments to limit exposure to metal price risk related to the metal pass through lag on some of our products and firm-price customer sales contracts. See Note 9 for additional information regarding our material derivative positions relating to hedges of operational risk, and their respective fair values.

A majority of our derivative contracts relating to hedges of operational risks contain liquidity based thresholds that could require us to provide additional collateral in the event our liquidity were to fall below specified levels. To minimize the exposure to additional collateral requirements related to our liability hedge positions, we allocate hedging transactions among our counterparties, use options as part of our hedging activities, or both. The aggregate fair value of our derivative instruments that were in a net liability position was $10.4 million and $14.6 million at March 31, 2016 and December 31, 2015, respectively, and we had no collateral posted as of those dates.

We regularly review the creditworthiness of our derivative counterparties and do not expect to incur significant loss from the failure of any counterparties to perform under any agreements.

17

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Realized and Unrealized Gains and Losses. Realized and unrealized (losses) gains associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Included in Other Comprehensive Income (Loss):
Unrealized gain:
Foreign Currency	$	0.2		$	—
Included in Statements of Consolidated Income (Loss):
Realized loss1:
Aluminum	(2.7		)	(2.7		)
Natural Gas	(1.7		)	(1.3		)
Electricity	—			(0.7		)
Total realized loss	$	(4.4	)	$	(4.7	)
Unrealized gain (loss)2:
Non-designated hedges of operational risk:
Aluminum	$	3.2		$	(4.2	)
Natural Gas	0.8			(0.7		)
Electricity	—			0.4
Total non-designated hedges of operational risk	4.0			(4.5		)
Option Assets relating to the Convertible Notes3	—			10.2
Bifurcated Conversion Feature of the Convertible Notes3	—			(10.2		)
Total unrealized gain (loss)	$	4.0		$	(4.5	)

______________________

¹  Realized loss on hedges of operational risk are recorded within Cost of products sold, excluding depreciation, amortization and other items.

²  Unrealized gain (loss) on hedges of operational risk are recorded within Unrealized (gain) loss on derivative instruments.

³  Unrealized gain (loss) on financial derivatives related to our 4.5% unsecured cash convertible senior notes ("Convertible Notes"), which settled in April 2015.

The following table summarizes our material derivative positions at March 31, 2016:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Call option purchase contracts	4/16 through 6/16	2.0
Fixed price purchase contracts	4/16 through 12/17	128.4
Fixed price sales contracts	4/16 through 12/17	2.2
Midwest premium swap contracts1	4/16 through 12/17	92.0

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	4/16 through 12/18	7,070,000

18

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	5/16 through 8/17	3,950,374

______________________

¹  Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on our purchases of primary aluminum.

²  As of March 31, 2016, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 79%, 73% and 72% of the expected natural gas purchases for the remainder of 2016, 2017 and 2018 respectively.

We have physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for the remainder of 2016 and 2017, and 27% for 2018.

We enter into derivative contracts with counterparties, some of which are subject to enforceable master netting arrangements and some of which are not. We reflect the fair value of our derivative contracts on a gross basis on the Consolidated Balance Sheets (see Note 2).

The following tables present offsetting information regarding our derivatives by type of counterparty as of March 31, 2016 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.0	$	—	$	1.0	$	1.0	$	—	$	—
Counterparty (with partial netting agreements)	0.6		—		0.6		0.6		$	—	$	—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(6.3	)	$	—	$	(6.3	)	$	(1.0	)	$	—	$	(5.3	)
Counterparty (with partial netting agreements)	(5.7		)	—		(5.7		)	(0.6		)	—		(5.1		)
Total	$	(12.0	)	$	—	$	(12.0	)	$	(1.6	)	$	—	$	(10.4	)

19

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following tables present offsetting information regarding our derivatives by type of counterparty as of December 31, 2015 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.3	$	—	$	1.3	$	1.3	$	—	$	—
Counterparty (with partial netting agreements)	0.3		—		0.3		0.3		—		—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(8.5	)	$	—	$	(8.5	)	$	(1.3	)	$	—	$	(7.2	)
Counterparty (with partial netting agreements)	(7.7		)	—		(7.7		)	(0.3		)	—		(7.4		)
Total	$	(16.2	)	$	—	$	(16.2	)	$	(1.6	)	$	—	$	(14.6	)

9. Fair Value Measurements

Overview

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.

The fair values of financial assets and liabilities are evaluated and measured on a recurring basis. As part of that evaluation process, we 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. We historically have not had significant transfers into or out of each hierarchy level.

Financial assets and liabilities that we measure at fair value as required by GAAP include: (i) our derivative instruments; (ii) the plan assets of the Salaried VEBA and our Canadian defined benefit pension plan measured annually at December 31; and (iii) available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 5). We record certain other financial assets and liabilities at carrying value (see the tables below for the fair value disclosure of those assets and liabilities).

The majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur (or at least annually for goodwill), an evaluation of the affected non-financial asset or liability is required, potentially resulting in an adjustment to the carrying amount of such asset or liability.

20

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Fair Values of Financial Assets and Liabilities

Derivative Assets and Liabilities. Our derivative contracts are valued at fair value using significant observable and unobservable inputs.

Commodity, Energy and Foreign Currency Derivatives - The fair values of a majority of these derivative contracts are based upon trades in liquid markets. Valuation model inputs can generally be verified, and valuation techniques do not involve significant judgment. The fair values of such financial instruments are generally classified within Level 2 of the fair value hierarchy. We, however, have some derivative contracts that do not have observable market quotes. For these financial instruments, management uses significant unobservable inputs (e.g., information concerning regional premiums for swaps). Where appropriate, valuations are adjusted for various factors, such as bid/offer spreads. The fair values of these financial instruments are classified as Level 3 in the fair value hierarchy.

Salaried VEBA and Canadian Pension Plan Assets. The plan assets of the Salaried VEBA and our Canadian pension plan are measured annually on December 31 and reflected in our Consolidated Balance Sheets at fair value. 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.

Available for Sale Securities. We hold debt investment securities that are accounted for as available for sale securities. The fair value of the debt investment securities, which consist of commercial paper and corporate bonds, is determined based on valuation models that use observable market data. At March 31, 2016, all of our short-term investments had maturity dates within two months. We review our debt investment portfolio for other-than-temporary impairment at least quarterly or when there are changes in credit risk or other potential valuation concerns. At March 31, 2016 and March 31, 2015, the total unrealized loss, net of tax, included in accumulated other comprehensive loss was immaterial and was not other-than-temporarily impaired. We believe that it is probable that the principal and interest will be collected in accordance with the contractual terms, and that the unrealized loss on these securities were due to changes in normal market fluctuations, and were not due to increased credit risk or other valuation concerns. In addition to debt investment securities, we also hold assets in various investment funds at certain registered investment companies in connection with our deferred compensation program (see Note 5). Such assets are accounted for as available for sale securities and are measured and recorded at fair value based on the NAV of the investment funds on a recurring basis. The fair value input of the available for sale securities is considered either a Level 1 or Level 2 input depending on whether the debt security or investment fund is traded on a public exchange. The amortized cost for available for sale securities approximates their fair value.

All Other Financial Assets and Liabilities. We believe that the fair value of our cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their respective carrying values due to their short maturities and nominal credit risk.

The fair value of the Senior Notes at March 31, 2016 and December 31, 2015 was based on the Senior Notes' trading price and is considered a Level 1 input in the fair value hierarchy (see Note 3 for the carrying values).

21

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	March 31, 2016
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.8			—			0.8
Midwest premium swap contracts	—			—			0.5			0.5
Natural Gas -
Fixed priced purchase contracts	—			0.1			—			0.1
All Other Financial Assets:
Cash and cash equivalents	34.5			36.2			—			70.7
Short-term investments	—			10.0			—			10.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	34.5		$	54.6		$	0.5		$	89.6
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(5.6	)	$	—		$	(5.6	)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas –Fixed price purchase contracts	—			(6.1		)	—			(6.1		)
All Other Financial Liabilities:
Senior Notes	(205.7		)	—			—			(205.7		)
Total liabilities	$	(205.7	)	$	(11.7	)	$	(0.3	)	$	(217.7	)

22

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	December 31, 2015
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.3			—			0.3
Fixed price sales contracts	—			0.2			—			0.2
Midwest premium swap contracts	—			—			0.9			0.9
All Other Financial Assets:
Cash and cash equivalents	40.3			32.2			—			72.5
Short-term investments	—			30.0			—			30.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	40.3		$	70.2		$	0.9		$	111.4
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(8.9	)	$	—		$	(8.9	)
Fixed price sales contracts	—			(0.1		)	—			(0.1		)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas – Fixed price purchase contracts	—			(6.7		)	—			(6.7		)
Derivative Instruments (Designated Hedges):
Foreign Currency – Euro forward purchase contracts	—			(0.2		)	—			(0.2		)
All Other Financial Liabilities:
Senior Notes	(207.3		)	—			—			(207.3		)
Total liabilities	$	(207.3	)	$	(15.9	)	$	(0.3	)	$	(223.5	)

Financial instruments classified as Level 3 in the fair value hierarchy represent Midwest premium swap contracts for which at least one significant unobservable input in the valuation model is a management estimate. This is necessary due to the lack of an exchange traded product with observable market pricing data. Fair value was determined using a forward curve based on the average pricing quotes from our trading counterparties and applying a discount factor based on the risk-free interest rate.

23

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following table presents quantitative information for Level 3 Midwest premium derivative contracts:

	Fair Value at March 31, 2016 (in millions of dollars)			Valuation technique	Unobservable input	Settlement Period	Range ($ in unit price)
Assets:
Midwest premium contracts	$	0.5		Discounted fair value	Forward price curve	Apr-16 through Dec-17	$0.083 per metric ton to $0.084 per metric ton
Liabilities:
Midwest premium contracts	$	(0.3	)	Discounted fair value	Forward price curve	Apr-16 through Jun-17	$0.083 per metric ton to $0.084 per metric ton

The following table presents a reconciliation of activity for the Midwest premium derivative contracts on a net basis (in millions of dollars):

	Level 3
Fair value measurement at December 31, 2015	$	0.6
Total realized/unrealized (loss) included in:
Cost of goods sold excluding depreciation and amortization and other items and Unrealized loss on derivative instruments	—
Transactions involving Level 3 derivative contracts:
Purchases	(0.1		)
Sales	—
Issuances	—
Settlements	(0.3		)
Transactions involving Level 3 derivatives – net	(0.4		)
Transfers in and/or out of Level 3 valuation hierarchy	—
Fair value measurement at March 31, 2016	$	0.2
Total gain included in Unrealized (gain) loss on derivative instruments, attributable to the change in unrealized gain/loss relating to derivative contracts held at March 31, 2016:	$	(0.1	)

Fair Values of Non-Financial Assets and Liabilities

We concluded that none of our non-financial assets and liabilities subject to fair value assessments on a non-recurring basis required a material adjustment to the carrying amount of such assets and liabilities for the quarters ended March 31, 2016 and March 31, 2015.

10. Net Income (Loss) Per Share

Basic and diluted net income (loss) per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):

24

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	Quarter Ended
	March 31,
	2016		2015
Numerator:
Net income (loss)	$	26.3	$	(292.2	)
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	17,864		17,344
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	336		—
Diluted2	18,200		17,344
Net income (loss) per common share, Basic:	$	1.47	$	(16.85	)
Net income (loss) per common share, Diluted:	$	1.44	$	(16.85	)

______________________

¹  The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.

²  The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.

The following securities were excluded from the weighted-average diluted shares computation for the quarters ended March 31, 2016 and March 31, 2015 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended
	March 31,
	2016	2015
Options to purchase common shares	17	17
Non-vested common shares, restricted stock units and performance shares	33	187
Warrants1	—	636
Total excluded	50	840

______________________

¹  Net-share-settled warrants ("Warrants") relating to approximately 3.7 million notional common shares of our common stock were outstanding at March 31, 2015 at an exercise price of approximately $60.57 per share, and were settled during a period from July 1, 2015 through December 18, 2015.

During the quarter ended March 31, 2016 and March 31, 2015, we paid a total of approximately $8.2 million ($0.45 per common share) and $7.1 million ($0.40 per common share), respectively, in cash dividends to stockholders, including the holders of restricted stock, and dividend equivalents to the holders of certain restricted stock units and to the holders of performance shares granted prior to 2014 with respect to the target number of underlying common shares (constituting approximately one-half of the maximum payout).

From time to time, we repurchase shares pursuant to a stock repurchase program authorized by our Board of Directors. Repurchase transactions will occur at such times and prices as management deems appropriate and will be funded with our excess liquidity after giving consideration to, among other things, internal and external growth opportunities and future cash flows. Repurchases may be in open-market transactions or in privately negotiated transactions and the program may be modified or terminated by our Board of Directors at any time.

During the quarters ended March 31, 2016 and March 31, 2015, we repurchased 83,265 shares of common stock (at a weighted-average price of $76.85 per share) and 405,259 shares of common stock at a weighted-average price of $74.05 per share, respectively, pursuant to the stock repurchase program. The total cost of $6.4 million and $30.0 million was recorded as Treasury stock during the quarters ended March 31, 2016 and March 31, 2015, respectively. At March 31, 2016, $116.9 million were available to repurchase our common shares pursuant to the stock repurchase program.

25

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

11. Segment and Geographical Area Information

Our primary line of business is the production of semi-fabricated specialty aluminum products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength ("Aero/HS products"), automotive ("Automotive Extrusions"), general engineering ("GE products") and other industrial end market applications ("Other products"). We operate 11 focused production facilities in the United States and one in Canada. Consistent with the manner in which our chief operating decision maker reviews and evaluates our business, the Fabricated Products business is treated as a single operating segment. At March 31, 2016, approximately 63% of our employees were covered by collective bargaining agreements and approximately 6% of our employees were covered by collective bargaining agreements with expiration dates occurring within one year from March 31, 2016.

In addition to the Fabricated Products segment, we have a business unit, All Other, which provides general and administrative support for our operations. For purposes of segment reporting under GAAP, we treat the Fabricated Products segment as a reportable segment. All Other is not considered a reportable segment.

The accounting policies of the Fabricated Products segment are the same as those described in Note 1. Segment results are evaluated internally by management before any allocation of corporate overhead and without any charge for income taxes, interest expense, or other net operating charges.

The following tables provide financial information by reporting segment and business unit for each period or as of each period-end, as applicable (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Net sales:
Fabricated Products	$	343.2		$	371.7
Segment operating income (loss):
Fabricated Products1	$	57.9		$	44.9
All Other2	(13.1		)	(503.5		)
Total operating income (loss)	$	44.8		$	(458.6	)
Interest expense	(3.7		)	(9.8		)
Other income, net	0.3			0.4
Income (loss) before income taxes	$	41.4		$	(468.0	)
Depreciation and amortization:
Fabricated Products	$	8.6		$	7.9
All Other	0.1			0.1
Total depreciation and amortization	$	8.7		$	8.0
Capital expenditures:
Fabricated Products	$	25.8		$	11.2
All Other	0.1			0.1
Total capital expenditures	$	25.9		$	11.3

_____________________

¹  Fabricated Products segment operating income included non-cash mark-to-market gain (loss) on primary aluminum, natural gas, electricity and foreign currency hedging activities, which totaled $4.0 million and $(4.5) million for the quarters ended March 31, 2016 and March 31, 2015, respectively. For further discussion regarding mark-to-market matters, see Note 8.

²  Operating loss in All Other included Net periodic postretirement benefit cost of $0.8 million and $0.6 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. Additionally, operating loss in All Other included (gain) loss on removal of Union VEBA net assets of $(0.1) million and $492.2 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. See Note 5 for further details.

26

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	March 31, 2016		December 31, 2015
Assets:
Fabricated Products	$	932.5	$	904.7
All Other1	304.1		342.9
Total assets	$	1,236.6	$	1,247.6

_____________________

¹  Assets in All Other represent primarily all of our cash and cash equivalents, short-term investments, financial derivative assets (see Note 9) and net deferred income tax assets.

Net sales by product categories based on end market applications for the Fabricated Products segment were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Net sales:
Aero/HS products	$	176.9	$	180.3
Automotive Extrusions	48.4		50.1
GE products	105.4		119.1
Other products	12.5		22.2
Total net sales	$	343.2	$	371.7

Geographic information for income taxes paid were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Income taxes paid:
Fabricated Products –
United States	$	0.1	$	0.1
Canada	0.2		0.9
Total income taxes paid	$	0.3	$	1.0

The aggregate foreign currency transaction gain (loss) included in determining net income were immaterial for the quarters ended March 31, 2016 and March 31, 2015.

For the quarter ended March 31, 2016, one customer represented 25% and another represented 10% of Fabricated Products Net sales. For the quarter ended March 31, 2015, one customer represented 23% and another represented 10% of Fabricated Products Net Sales.

At March 31, 2016, one customer represented 19% and one other individual customer represented 12% of the trade receivables balance. Two individual customers accounted for 17% of the trade receivables balance at December 31, 2015. 

27

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Information for delivery of our primary aluminum supply from our major suppliers were as follows:

	Quarter Ended
	March 31,
	2016		2015
Percentage of total primary aluminum supply (lbs):
Supply from the Company's top five major suppliers	83	%	75	%
Supply from the Company's largest supplier	30	%	29	%
Supply from the Company's second and third largest suppliers	35	%	29	%

12. Supplemental Cash Flow Information

	Three Months Ended
	March 31,
	2016		2015
	(In millions of dollars)
Interest paid	$	0.3	$	0.1
Non-cash investing and financing activities:
Stock repurchases not yet settled (accrued in accounts payable)	$	0.1	$	1.8
Unpaid purchases of property and equipment	$	2.0	$	1.3

13. Other Income, Net

Other income, net consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Interest income	$	0.1	$	0.2
Realized gain on investments	—		0.3
All other income (expense), net	0.2		(0.1		)
Other income, net	$	0.3	$	0.4

28

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

14. Other Comprehensive Income

The following table presents the tax effect allocated to each component of other comprehensive income for each period presented (in millions of dollars):

	Before-Tax		Income Tax			Net-of-Tax
	Amount		(Expense) Benefit3			Amount
Quarter Ended March 31, 2016
Salaried VEBA:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.1	$	—		$	0.1
Amortization of prior service cost1	1.0		(0.4		)	0.6
Other comprehensive income relating to Salaried VEBA	1.1		(0.4		)	0.7
Foreign currency translation gain on Canadian pension plan	0.1		—			0.1
Unrealized gain on foreign currency cash flow hedges	0.2		(0.1		)	0.1
Other comprehensive income	$	1.4	$	(0.5	)	$	0.9
Quarter Ended March 31, 2015
VEBAs:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.3	$	(0.1	)	$	0.2
Amortization of prior service cost1	0.7		(0.3		)	0.4
Removal of obligation relating to Union VEBA	106.6		(40.4		)	66.2
Other comprehensive income relating to VEBAs	107.6		(40.8		)	66.8
Available for sale securities:
Reclassification of unrealized loss upon sale of available for sale securities2	0.1		(0.1		)	—
Other comprehensive income relating to available for sale securities	0.1		(0.1		)	—
Foreign currency translation gain	0.1		—			0.1
Other comprehensive income	$	107.8	$	(40.9	)	$	66.9

________________

¹  Amounts reclassified out of Accumulated other comprehensive loss relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to the Salaried VEBA.

²  Amounts reclassified out of Accumulated other comprehensive loss relating to sales of available for sale securities were included as a component of Other (expense) income, net. We use the specific identification method to determine the amount reclassified out of Accumulated other comprehensive loss.

³  Income tax amounts reclassified out of Accumulated other comprehensive loss were included as a component of Income tax (provision) benefit.

29

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

15. Condensed Guarantor and Non-Guarantor Financial Information

Our Senior Notes were issued pursuant to an indenture dated May 23, 2012 ("Indenture"), among Kaiser Aluminum Corporation ("Parent"), the subsidiary guarantors party thereto ("Guarantor Subsidiaries") and Wells Fargo Bank, National Association, as trustee ("Trustee"). The Guarantor Subsidiaries currently include Kaiser Aluminum Investments Company, Kaiser Aluminum Fabricated Products, LLC, Kaiser Aluminum Mill Products, Inc., Kaiser Aluminum Washington, LLC and Kaiser Aluminum Alexco, LLC, all of which are 100% owned by the Parent. The guarantees are full and unconditional and joint and several but have customary releases in the following situations: (i) the sale of the Guarantor Subsidiary or all of its assets; (ii) the declaration of a Guarantor Subsidiary as an unrestricted subsidiary under the Indenture; (iii) the termination or release of the Guarantor Subsidiary's guarantee of certain other indebtedness; or (iv) our exercise of legal defeasance or covenant defeasance or the discharge of our obligations under the Indenture.

The following condensed consolidating financial information as of March 31, 2016 and December 31, 2015, and for the quarters ended March 31, 2016 and March 31, 2015present: (i) the financial position, results of operation and cash flows for each of (a) Parent, (b) the Guarantor Subsidiaries on a combined basis and (c) the Non-Guarantor Subsidiaries (as defined below) on a combined basis; (ii) the adjustments necessary to eliminate investments in subsidiaries and intercompany balances and transactions among Parent, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries; and (iii) the resulting totals, reflecting information for us on a consolidated basis, as reported. In the following tables, "Non-Guarantor Subsidiaries" refers to Kaiser Aluminum Canada Limited, Trochus Insurance Company, DCO Management, LLC, Kaiser Aluminum France, S.A.S. and Kaiser Aluminum Beijing Trading Company; and "Consolidating Adjustments" represent the adjustments necessary to eliminate the investments in our subsidiaries and other intercompany sales and cost of sales transactions. The condensed consolidating financial information should be read in conjunction with the consolidated financial statements herein.

30

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

March 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	69.1	$	1.6	$	—		$	70.7
Short-term investments	—		10.0		—		—			10.0
Receivables:
Trade receivables – net	—		134.0		4.8		—			138.8
Intercompany receivables	93.6		23.1		1.3		(118.0		)	—
Other	—		5.9		2.7		—			8.6
Inventories	—		208.3		5.8		(3.5		)	210.6
Prepaid expenses and other current assets	0.1		8.5		0.8		(0.3		)	9.1
Total current assets	93.7		458.9		17.0		(121.8		)	447.8
Investments in and advances to subsidiaries	912.8		32.0		—		(944.8		)	—
Property, plant and equipment – net	—		473.1		31.4		—			504.5
Long-term intercompany receivables	—		—		3.9		(3.9		)	—
Deferred tax assets – net	—		190.5		—		7.0			197.5
Intangible assets – net	—		30.1		—		—			30.1
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.4		0.1		—			19.5
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.6	$	64.6	$	5.0	$	—		$	70.2
Intercompany payable	17.9		99.3		4.5		(121.7		)	—
Accrued salaries, wages and related expenses	—		32.4		1.5		—			33.9
Other accrued liabilities	5.4		51.3		0.2		(0.4		)	56.5
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	23.9		247.7		11.2		(122.1		)	160.7
Net liabilities of Salaried VEBA	—		18.7		—		—			18.7
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.9		—		(3.9		)	—
Long-term liabilities	—		66.2		6.3		—			72.5
Long-term debt	194.8		—		—		—			194.8
Total liabilities	218.7		336.5		19.6		(126.0		)	448.8
Total stockholders' equity	787.8		904.7		32.8		(937.5		)	787.8
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6

31

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2015

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	72.2	$	0.3	$	—		$	72.5
Short-term investments	—		30.0		—		—			30.0
Receivables:
Trade receivables – net	—		114.0		2.7		—			116.7
Intercompany receivables	—		111.2		1.1		(112.3		)	—
Other	—		3.8		2.3		—			6.1
Inventories	—		216.3		6.6		(3.3		)	219.6
Prepaid expenses and other current assets	0.2		56.2		1.7		(1.4		)	56.7
Total current assets	0.2		603.7		14.7		(117.0		)	501.6
Investments in and advances to subsidiaries	1,077.2		31.4		—		(1,108.6		)	—
Property, plant and equipment – net	—		464.3		31.1		—			495.4
Long-term intercompany receivables	—		—		3.1		(3.1		)	—
Deferred tax assets – net	—		156.3		—		7.0			163.3
Intangible assets – net	—		30.5		—		—			30.5
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.5		0.1		—			19.6
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.5	$	73.6	$	2.6	$	—		$	76.7
Intercompany payable	106.5		14.8		4.0		(125.3		)	—
Accrued salaries, wages and related expenses	—		38.3		1.5		—			39.8
Other accrued liabilities	1.4		52.3		0.4		(1.4		)	52.7
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	108.4		179.1		8.5		(126.7		)	169.3
Net liabilities of Salaried VEBA	—		19.0		—		—			19.0
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.1		—		(3.1		)	—
Long-term liabilities	—		81.3		6.2		—			87.5
Long-term debt	194.6		—		—		—			194.6
Total liabilities	303.0		282.5		16.8		(129.8		)	472.5
Total stockholders' equity	774.4		1,060.4		32.2		(1,091.9		)	775.1
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6

32

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)

(In millions of dollars)

Quarter Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	335.7		$	26.4		$	(18.9	)	$	343.2
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			257.1			23.1			(18.2		)	262.0
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(4.0		)	—			—			(4.0		)
Depreciation and amortization	—			8.2			0.5			—			8.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.8			23.6			2.2			(0.5		)	26.1
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	0.8			24.3			2.2			(0.5		)	26.8
Total costs and expenses	0.8			290.5			25.8			(18.7		)	298.4
Operating (loss) income	(0.8		)	45.2			0.6			(0.2		)	44.8
Other (expense) income:
Interest expense	(4.3		)	0.6			—			—			(3.7		)
Other (expense) income, net	—			0.3			—			—			0.3
Income (loss) before income taxes	(5.1		)	46.1			0.6			(0.2		)	41.4
Income tax (provision) benefit	—			(16.9		)	(0.2		)	2.0			(15.1		)
Earnings (loss) in equity of subsidiaries	31.4			0.3			—			(31.7		)	—
Net income (loss)	$	26.3		$	29.5		$	0.4		$	(29.9	)	$	26.3
Comprehensive income	$	27.2		$	30.3		$	0.5		$	(30.8	)	$	27.2

33

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE (LOSS) INCOME

(In millions of dollars)

Quarter Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
Net sales	$	—		$	363.4		$	34.7	$	(26.4	)	$	371.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			296.4			31.6		(25.7		)	302.3
Unrealized loss on derivative instruments	—			4.5			—		—			4.5
Depreciation and amortization	—			7.7			0.3		—			8.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			20.7			1.6		(0.6		)	22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.6			—		—			0.6
Loss on removal of Union VEBA net assets	—			492.2			—		—			492.2
Total selling, general, administrative, research and development	1.0			513.5			1.6		(0.6		)	515.5
Total costs and expenses	1.0			822.1			33.5		(26.3		)	830.3
Operating (loss) income	(1.0		)	(458.7		)	1.2		(0.1		)	(458.6		)
Other (expense) income:
Interest expense	(9.5		)	(0.5		)	—		0.2			(9.8		)
Other (expense) income, net	—			0.5			0.1		(0.2		)	0.4
(Loss) income before income taxes	(10.5		)	(458.7		)	1.3		(0.1		)	(468.0		)
Income tax benefit	—			171.9			—		3.9			175.8
(Loss) earnings in equity of subsidiaries	(281.7		)	1.1			—		280.6			—
Net (loss) income	$	(292.2	)	$	(285.7	)	$	1.3	$	284.4		$	(292.2	)
Comprehensive (loss) income	$	(225.3	)	$	(218.9	)	$	1.4	$	217.5		$	(225.3	)

34

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash provided by operating activities1	$	17.2		$	201.4		$	2.7		$	(200.0	)	$	21.3
Cash flows from investing activities:
Capital expenditures	—			(25.3		)	(0.6		)	—			(25.9		)
Proceeds from disposition of available for sale securities	—			20.0			—			—			20.0
Net cash used in investing activities	—			(5.3		)	(0.6		)	—			(5.9		)
Cash flows from financing activities:
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.7		)	—			—			—			(2.7		)
Repurchase of common stock	(6.3		)	—			—			—			(6.3		)
Cash dividends paid to stockholders	(8.2		)	—			—			—			(8.2		)
Cash dividends paid to Parent	—			(200.0		)	—			200.0			—
Intercompany loan	—			0.8			(0.8		)	—			—
Net cash (used in) provided by financing activities	(17.2		)	(199.2		)	(0.8		)	200.0			(17.2		)
Net (decrease) increase in cash and cash equivalents during the period	—			(3.1		)	1.3			—			(1.8		)
Cash and cash equivalents at beginning of period	—			72.2			0.3			—			72.5
Cash and cash equivalents at end of period	$	—		$	69.1		$	1.6		$	—		$	70.7

________________

¹  The Guarantor Subsidiaries’ Net cash provided by operating activities reflects a decrease in current Intercompany receivables from the Parent and an increase in current Intercompany payable to the Parent related to the $200.0 million dividend made by the Guarantor Subsidiaries to the Parent.  The dividend to the Parent and intercompany activity is eliminated within the consolidating adjustments.

35

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$	37.8		$	(32.7	)	$	2.3		$	—	$	7.4
Cash flows from investing activities:
Capital expenditures	—			(6.7		)	(4.6		)	—		(11.3		)
Proceeds from disposition of available for sale securities	—			84.0			—			—		84.0
Net cash provided by (used in) investing activities	—			77.3			(4.6		)	—		72.7
Cash flows from financing activities:
Payment of capital lease liability	—			(0.1		)	—			—		(0.1		)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	—			1.0			—			—		1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.5		)	—			—			—		(2.5		)
Repurchase of common stock	(28.2		)	—			—			—		(28.2		)
Cash dividend paid to stockholders	(7.1		)	—			—			—		(7.1		)
Intercompany loan	—			(1.9		)	1.9			—		—
Net cash (used in) provided by financing activities	(37.8		)	(1.0		)	1.9			—		(36.9		)
Net increase (decrease) in cash and cash equivalents during the period	—			43.6			(0.4		)	—		43.2
Cash and cash equivalents at beginning of period	—			175.3			2.4			—		177.7
Cash and cash equivalents at end of period	$	—		$	218.9		$	2.0		$	—	$	220.9

16. Subsequent Events

Tax Asset Protection Rights Agreement. On April 7, 2016 our Board of Directors adopted a Tax Asset Protection Rights Plan ("Rights Plan") designed to preserve our ability to utilize without limitation our net operating loss carryforwards and other significant tax attributes to offset future taxable income. The Rights Plan was adopted because certain stock transfer restrictions designed to preserve our tax benefits currently contained in our certificate of incorporation are scheduled to expire on July 6, 2016. At our 2016 Annual Meeting of Stockholders, we intend to seek stockholder approval of the Rights Plan, as well as stockholder approval of an amendment to our certificate of incorporation that would implement stock transfer restrictions to replace those that are expiring.

Preferred Stock. In connection with the Rights Plan, our Board of Directors declared a dividend, payable April 22, 2016, of a right (a "Right") to purchase one Series A Junior Participating Preferred Stock (the "Series A Preferred") for each outstanding share of our common stock, par value $0.01 per share. The number of shares constituting Series A Preferred, par value $0.01 per share, is 900,000. If the Rights become exercisable, each Right would allow its holder to purchase one one-hundredth of a share of our Series A Preferred for a purchase price of $400.00. Each fractional share of Series A Preferred Stock would give the stockholder approximately the same dividend, voting and liquidation rights as does one share of common stock. Prior to exercise, however, a Right does not give its holder any dividend, voting or liquidation rights.

The Rights will not be exercisable until the earlier of: (i) 10 days after a public announcement by us that a person or group has become an acquiring person and (ii) 10 business days (or a later date determined by our board of directors) after a person or group begins a tender or exchange offer that, if completed, would result in that person or group becoming an acquiring Person.

36

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Until the date that the Rights become exercisable (the "Distribution Date"), common stock certificates will also evidence the Rights and will contain a notation to that effect. Any transfer of shares of common stock prior to the Distribution Date will constitute a transfer of the associated Rights. After the Distribution Date, the Rights will separate from the common stock and be evidenced by Right certificates, which we will mail to all holders of Rights that have not become void. After the Distribution Date, if a person or group already is or becomes an acquiring person, all holders of Rights, except the acquiring person, may exercise their Rights upon payment of the purchase price to purchase shares of common stock (or other securities or assets as determined by the Board of Directors) with a market value of two times the purchase price (a "Flip-in Event"). After the Distribution Date, if a Flip-in Event has already occurred and we are acquired in a merger or similar transaction, all holders of Rights except the acquiring person may exercise their Rights upon payment of the purchase price, to purchase shares of the acquiring or other appropriate entity with a market value of two times the purchase price of the Rights. Rights may be exercised to purchase Series A Preferred only after the Distribution Date occurs and prior to the occurrence of a Flip-in Event as described above. A Distribution Date resulting from the commencement of a tender offer or exchange offer as described in (ii) above could precede the occurrence of a Flip-in Event, in which case the Rights could be exercised to purchase Series A Preferred. A Distribution Date resulting from any occurrence described in (i) above would necessarily follow the occurrence of a Flip-in Event, in which case the Rights could be exercised to purchase shares of our common stock (or other securities or assets) as described above. Additional information regarding the Rights Plan is contained in the Current Report on Form 8-K and in the Registration Statement on Form 8-A, both filed by the Company with the SEC on April 8, 2016.

Dividend Declaration. On April 15, 2016, we announced that our Board of Directors declared a cash dividend of $0.45 per common share or approximately $8.1 million (including dividend equivalents), which will be paid on or about May 13, 2016 to stockholders of record at the close of business on April 25, 2016.

37

Item 2.Management's Discussion and Analysis of Financial Condition and Results of Operations

This Item should be read in conjunction with Part I, Item 1. "Financial Statements" of this Quarterly Report on Form 10-Q (this "Report").

This Report contains statements which constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These statements appear throughout this Report and can be identified by the use of forward-looking terminology such as "believes,""expects,""may,""estimates,""will,""should,""plans" or "anticipates" or the negative of the foregoing or other variations of comparable terminology, or by discussions of strategy. Readers are cautioned that any such forward-looking statements are not guarantees of future performance and involve significant risks and uncertainties and that actual results may vary from those in the forward-looking statements as a result of various factors. These factors include: the effectiveness of management's strategies and decisions; general economic and business conditions, including cyclicality and other conditions in the aerospace, automotive and other end market applications we serve; developments in technology; new or modified statutory or regulatory requirements; and changing prices and market conditions. This Item and Part I, Item 1A. "Risk Factors" included in our Annual Report on Form 10-K for the year ended December 31, 2015 each identify other factors that could cause actual results to vary. No assurance can be given that these are all of the factors that could cause actual results to vary materially from the forward-looking statements.

Management's discussion and analysis of financial condition and results of operations ("MD&A") is designed to provide a reader of our financial statements with a narrative from the perspective of our management on our financial condition, results of operations, liquidity and certain other factors that may affect our future results. Our MD&A is presented in the following sections:

• Overview;

• Highlights of the Quarter Ended March 31, 2016;

• Results of Operations;

• Liquidity and Capital Resources;

• Contractual Obligations, Commercial Commitments and Off-Balance-Sheet and Other Arrangements;

• Critical Accounting Estimates and Policies;

• New Accounting Pronouncements; and

• Available Information.

Our MD&A should be read in conjunction with the consolidated financial statements and related notes thereto included under Part I, Item 1. "Financial Statements" included in this Report and the consolidated financial statements and related notes included in Part II, Item 8. "Financial Statements and Supplementary Data" of our Annual Report on Form 10-K for the year ended December 31, 2015.

In the discussion of operating results below, we refer to certain items as non-run-rate items. For purposes of such discussion, non-run-rate items are items that, while they may recur from period-to-period: (i) are particularly material to results; (ii) affect costs primarily as a result of external market factors; and (iii) may not recur in future periods if the same level of underlying performance were to occur. Non-run-rate items are part of our business and operating environment but are worthy of being highlighted for the benefit of readers of our financial statements. Our intent is to allow users of the financial statements to consider our results both in light of and separately from items such as unrealized-mark-to-market gain or loss on derivatives related to fluctuations in underlying metal prices and energy prices and currency exchange rates, lower of cost or market inventory write-downs and gain or loss related to the voluntary employee beneficiary associations ("VEBAs"). For a reconciliation of operating income (loss) excluding non-run-rate items to operating income (loss), see "Results of Operations - Segment and Business Unit Information" below.

A fundamental part of our business model is to mitigate the impact of aluminum price volatility. We purchase primary and scrap aluminum, our main raw material, at prices that fluctuate on a monthly basis, and we use pricing policies that generally allow us to pass metal cost fluctuations through to our customers. For some of our higher value added products sold on a spot basis, however, the pass through of metal price movements can sometimes lag by as much as several months, with a favorable impact to us when metal prices decline and an adverse impact to us when metal prices increase. Additionally, we often enter into firm-price customer sales agreements that specify the underlying metal price plus a conversion price. Spot sales with lagged metal price pass through and firm-price sales agreements create metal price exposure for us which we mitigate through a hedging program. Our pricing policies and hedging program are designed to largely mitigate the impact on our profitability as a result of fluctuations in underlying metal price. As such, we provide information regarding value added revenue, which represents Net sales less the Hedged Cost of Alloyed Metal. Hedged Cost of Alloyed Metal is our Midwest Transaction Price of aluminum ("Midwest Price"), which reflects the primary aluminum supply/demand dynamics in North America, plus the cost of

38

alloying elements plus any realized gains and/or losses on settled hedges related to the metal sold in the referenced period. Value added revenue (including average realized value added revenue and value added revenue of the product categories of our Fabricated Products segment) is worthy of being highlighted for the benefit of readers of our financial statements. Our intent is to allow users of the financial statements to consider our net sales information both with and without the metal cost component thereof. For a reconciliation of value added revenue to net sales, see "Results of Operations - Segment and Business Unit Information" below.

Overview

We are a leading North American manufacturer of semi-fabricated specialty aluminum products for the following end market applications: aerospace and high strength products ("Aero/HS products"); extrusions for automotive applications ("Automotive Extrusions"); general engineering products ("GE products"); and other industrial products ("Other products").

At March 31, 2016, we operated 11 focused production facilities in the United States and one facility in Canada that produce rolled, extruded and drawn aluminum products used principally for aerospace and defense, automotive, consumer durables, electronics, electrical and machinery and equipment end market applications. Through these facilities, we recorded Net sales of approximately $343.2 million on shipments of approximately 159.3 million pounds of semi-fabricated aluminum products during the quarter ended March 31, 2016.

We have long-standing relationships with our customers, which consist primarily of blue-chip companies including leading aerospace companies, automotive suppliers and metal service centers. We have a culture of continuous improvement that is facilitated by the Kaiser Production System ("KPS"), an integrated application of tools such as Lean Manufacturing, Six Sigma and Total Productive Manufacturing. We believe KPS enables us to continuously reduce our own manufacturing costs, eliminate waste throughout the value chain. We strive to tightly integrate the management of the operations within our Fabricated Products segment across multiple production facilities, product lines and target markets in order to maximize the efficiency of product flow to our customers.

Our highly engineered products are manufactured to meet demanding requirements of aerospace/high strength, automotive, general engineering and other industrial end market applications. We have focused our business on select end market applications where we believe we have sustainable competitive advantages and opportunities for long-term profitable growth. We believe that we differentiate ourselves with "Best in Class" customer satisfaction driven by quality, availability, service and delivery performance. We believe that we further differentiate ourselves by offering a broad product portfolio, including our KaiserSelect^® products, which are engineered and manufactured to deliver enhanced product characteristics with improved consistency, which results in such benefits as better performance, lower waste and, in many cases, lower production cost for our customers.

In the commercial aerospace sector, we believe that global economic growth and development will continue to drive growth in airline passenger miles. In addition, trends such as longer routes, larger payloads and focus on fuel efficiency have increased the demand for new and larger aircraft. We believe the strength of commercial aerospace demand is demonstrated by the existing nine-year backlog for the two primary manufacturers of commercial aircraft. Further, we believe that the long-term demand drivers, including growing build rates, larger airframes and continued conversion of parts to monolithic design (where aluminum plate is heavily machined to form the desired part from a single piece of metal as opposed to using aluminum sheet, extrusions or forgings that are affixed to one another using rivets, bolts or welds) throughout the industry will continue to increase demand for our high strength aerospace plate. We expect aerospace plate demand to grow at a pace higher than our other Aero/HS products (including sheet, extruded shapes, cold finish rod and bar and tube) as some of the applications using these other Aero/HS products continue to be converted to monolithic design (using plate in lieu of these other products). Additionally, our Aero/HS products other than plate tend to be used to a greater degree in applications that have a lower growth rate than commercial aerospace.

Our Aero/HS and GE products are also sold for use in defense end market applications. Requirements of military engagements and sequestration of spending by the United States government will determine near-term demand for our Aero/HS and GE products for use in such applications. We expect the production of the F-35, or Joint Strike Fighter to continue to be a demand driver for our Aero/HS products.

Commercial aerospace and defense end market applications have demanding customer requirements for quality and consistency. As a result, there are a limited number of suppliers worldwide who are qualified to serve these market segments. We believe barriers to entry include significant capital requirements, technological expertise and a rigorous qualification process for safety-critical applications.

In recent years, automotive original equipment manufacturers ("OEMs") and their suppliers have at an increasing pace been converting many automotive components that historically were made of steel to aluminum to decrease weight without

39

sacrificing structural integrity and safety performance and thereby achieve greater fuel efficiency standards mandated by stringent United States' Corporate Average Fuel Economy ("CAFE") regulations. We believe fuel efficiency standards along with consumer preference for larger vehicles will continue to drive growth in demand for aluminum extruded components in passenger vehicles as a replacement for the heavier weight of steel components. Our Automotive Extrusions are designed and produced to provide specific mechanical properties and performance attributes required in automotive applications across a broad mix of North American OEMs and automotive platforms. We believe that these attributes are not easily replicated by our competitors and are important to our customers, who are typically first tier automotive suppliers.

Our GE products serve the North American industrial market segments, and demand for these products generally tracks the broader manufacturing economic environment.

Highlights of the quarter ended March 31, 2016 include:

• Continued strength in underlying demand for aerospace applications with improved aerospace plate shipments and recovery in sales of our long products following destocking that occurred during the fourth quarter of 2015;

• Strong sales price and margins due to rich product mix, continued benefits of selective spot price increases we put in place in 2015, and lower contained metal costs;

• Higher sales for Automotive Extrusions driven by shipments of chassis and structural applications on programs that launched during 2015;

• Continued improvement in underlying cost and manufacturing efficiency;

• Lower of cost or market inventory write-down of $4.9 million due primarily to a reduction of sales price on firm-priced contracts and a decrease in conversion costs;

• Combined cash and cash equivalents, short-term investments and net borrowing availability under our Revolving Credit Facility of approximately $372.5 million, with no borrowings under the revolving credit facility, as of March 31, 2016;

• Declaration and payment of a regular dividend of $0.45 per common share, or $8.2 million; and

• Repurchase of 83,265 shares of our common stock at the weighted average price per share of $76.85.

Results of Operations

Consolidated Results of Operations

Net Sales. Net sales totaled $343.2 million and $371.7 million for the quarters ended March 31, 2016 and March 31, 2015, respectively, reflecting a 9% decrease in average realized sales price per pound, partially offset by a slight increase in Fabricated Products segment shipment volume. The decrease in average realized sales price per pound reflected a 25% decrease in average Hedged Cost of Alloyed Metal prices per pound, partially offset by a 6% increase in average value added revenue per pound. The increase in average value added revenue per pound reflected continued benefits of pricing improvements on some Aero/HS products, the benefit from lower contained metal prices on some high value added products and a more favorable shipment mix of Aero/HS products sold. The slight increase in Fabricated Products segment shipment volume was due primarily to: (i) a 2.4 million pound, or 11%, increase in Automotive Extrusions shipments, which reflected ongoing shipments on new programs that launched during the latter part of 2015, including significant volumes shipped with respect to programs supporting Ford’s aluminum-intensive F-150 platform; (ii) a 2.7 million pound, or 5% increase in GE products and (iii) a 1.8 million pound, or 3% increase in Aero/HS products, due to throughput enhancements from our investments at Trentwood and a recovery in long products following destocking in the fourth quarter of 2015, partially offset by a 5.5 million pound, or 41% decrease in Other products as a result of positioning our capacity for growth in strategic applications.

The price for the aluminum we purchase is typically based on the Average Midwest Transaction Price ("Midwest Price"). The Midwest Price represents the London Metal Exchange price ("LME") plus a Midwest premium which fluctuates in response to the aluminum supply/demand dynamics in North America. Fluctuation in the Midwest Price for primary aluminum does not necessarily directly impact profitability because: (i) a substantial portion of the business conducted by the Fabricated Products segment passes aluminum price changes directly onto customers and (ii) our hedging activities in support of the Fabricated Products segment's firm-price sales agreements limit our losses, as well as gains, from primary metal price changes. The average LME plus Midwest premium transaction price per pound of primary aluminum for the quarters ended March 31, 2016 and March 31, 2015 was $0.69 + $0.09 and $0.82 + $0.22, respectively. At April 18, 2016, the LME plus Midwest premium transaction price per pound was $0.70 + $0.08.

40

Cost of Products Sold, Excluding Depreciation and Amortization and Other Items. Cost of products sold, excluding depreciation and amortization and other items for the quarter endedMarch 31, 2016 totaled $262.0 million, or 76% of Net sales, compared to $302.3 million, or 81% of Net sales, for the quarter endedMarch 31, 2015. The decrease of $40.3 million was comprised of: (i) a $42.0 million decrease in Hedged Cost of Alloyed Metal and (ii) higher specific costs in the quarter ended March 31, 2015 related to signing bonuses paid upon labor agreement ratifications and excess freight costs of $1.1 million and $0.9 million, respectively, partially offset by $2.0 million of higher net manufacturing conversion and other costs and $1.8 million of higher planned major maintenance expense. Of the $42.0 million decrease in Hedged Cost of Alloyed Metal, $43.6 million was due to lower hedged metal prices, partially offset by $1.5 million of higher shipment volume, as discussed in "Net Sales" above. The increase in net manufacturing conversion and other costs primarily reflected $1.9 million of higher conversion costs due to the impact of higher shipment volume. See "Segment and Business Unit Information" below for a further discussion of the comparative results of operations for the quarters ended March 31, 2016 and March 31, 2015.

Lower of Cost or Market Inventory Write-Down. We recorded a lower of cost or market inventory write-down of $4.9 million in the quarter ended March 31, 2016, predominantly as a result of a decrease in our net realizable value of inventory (less a normal profit margin).

Selling, General, Administrative, Research and Development ("SG&A and R&D"). SG&A and R&D expense totaled $26.1 million and $22.7 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. The increase was due primarily to: (i) a $2.1 million increase in our short-term incentive compensation based on improved performance factor modifiers; (ii) a $0.5 million increase in our long-term incentive compensation; (iii) a $0.4 million increase in salaries and benefits and (iv) a $0.2 million increase in workers' compensation costs.

Net Periodic Postretirement Benefit Cost Relating to Salaried VEBA. Net periodic postretirement benefit cost relating to Salaried VEBA totaled $0.8 million and $0.6 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. See Note 5 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding the Salaried VEBA.

(Gain) Loss on Removal of Union VEBA Net Assets. (Gain) loss on removal of Union VEBA net assets was ($0.1) million and $492.2 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. Loss on removal of Union VEBA net assets for the quarter ended March 31, 2015 was due to the removal of the Union VEBA's plan assets, related deferred tax liabilities and accumulated other comprehensive loss from our consolidated financial statements during the quarter ended March 31, 2015 as a result of the definitive expiration of our obligation to make annual variable contributions to the Union VEBA for any period after September 2017. The loss on the removal of Union VEBA net assets included a $45.4 million accrual for the estimated variable contributions to be paid with respect to 2015, 2016 and 2017. Because the amount of each annual variable cash contribution is subject to change based on our actual cash flow for each respective calendar year, we review the estimated liability for the remaining variable cash contributions quarterly and reflect changes in our Operating (loss) income. See Note 5 of Notes to Interim Consolidated Financial Statements included in this Report for further details.

Interest Expense. Interest expense represents cash and non-cash interest expense incurred on our 8.25% senior notes due 2020 ("Senior Notes") and our revolving credit facility, net of capitalized interest. Interest expense was $3.7 million and $9.8 million for the quarters ended March 31, 2016 and March 31, 2015, respectively, net of $0.9 million and $0.3 million of interest expense capitalized as part of construction in progress, respectively. The decrease in interest expense was due primarily to the settlement of our Convertible Notes on April 1, 2015. Non-cash amortization of the discount on our Convertible Notes accounted for $2.4 million of the total interest expense for the quarter ended March 31, 2015.

Income Tax Provision. See Note 4 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding our income tax provision.

Derivatives

See Note 8 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding our derivatives.

Fair Value Measurements

See Note 9 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding our fair value measurements.

41

Deferred Tax Assets

Our non-current net deferred tax assets were $197.5 million and $163.3 million at March 31, 2016 and December 31, 2015, respectively. The increase in the non-current net deferred tax assets was primarily related to the early adoption of ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, which requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as non-current on the balance sheet. This was partially offset by a decrease of $14.8 million for the utilization of our net operating losses.

Segment and Business Unit Information

Consistent with the manner in which our chief operating decision maker reviews and evaluates our business, we have one operating segment, which we refer to as Fabricated Products, that produces semi-fabricated specialty aluminum products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength, automotive, general engineering and other industrial end market applications. We categorize our products by the following end market applications: Aero/HS products, Automotive Extrusions, GE products and Other products. We also have a business unit, All Other, which provides general and administrative support for our operations. For purposes of segment reporting under United States generally accepted accounting principles ("GAAP"), we treat the Fabricated Products segment as a reportable segment. All Other is not considered a reportable segment.

The following data should be read in conjunction with our consolidated financial statements and the notes thereto included in Part I, Item 1. "Financial Statements" of this Report. See Note 11 of Notes to Interim Consolidated Financial Statements included in this Report for further information regarding segments. Interim results are not necessarily indicative of those for a full year.

Fabricated Products

The table below provides selected operational and financial information for our Fabricated Products segment for each period presented (in millions of dollars):

	Quarter Ended March 31,
	2016			2015
Segment operating income	$	57.9		$	44.9
Impact to segment operating income of non-run-rate items:
Adjustments to plant-level LIFO1	(0.2		)	1.3
Mark-to-market gain (loss) on derivative instruments	4.0			(4.5		)
Non-cash lower of cost or market inventory write-down2	(4.9		)	—
Workers' compensation cost due to discounting	—			(0.1		)
Environmental expenses3	—			(0.4		)
Total non-run-rate items	(1.1		)	(3.7		)
Segment operating income excluding non-run-rate items	$	59.0		$	48.6

_____________________

¹  We manage our Fabricated Products segment business on a monthly last-in, first-out ("LIFO") basis at each plant, but report inventory externally on an annual LIFO basis in accordance with GAAP on a consolidated basis. This amount represents the conversion from GAAP LIFO applied on a consolidated basis for the Fabricated Products segment to monthly LIFO applied on a plant-by-plant basis.

²  The $4.9 million lower of cost or market inventory write-down during the quarter ended March 31, 2016 was due primarily to a decrease in our net realizable value of inventory (less a normal profit margin).

³  See Note 7 of Notes to Interim Consolidated Financial Statements included in this Report for additional information relating to the environmental expenses.

As noted above, operating income excluding non-run-rate items for the quarter endedMarch 31, 2016 was $10.4 millionhigher than operating income excluding such items for the quarter endedMarch 31, 2015. Higher operating income excluding non-run-rate items primarily reflected a positive sales impact of $13.1 million, partially offset by $1.8 million of higher planned major maintenance expense and an increase of $0.7 million in depreciation expense. The positive sales impact was due primarily to: (i) improved sales margin on certain Aero/HS and GE products reflecting improved spot pricing and lower contained metal costs and (ii) increased shipments of Automotive Extrusions, GE products and Aero/HS products. In addition,

42

an increase of $3.4 million in overhead cost during the quarter endedMarch 31, 2016 compared to the quarter endedMarch 31, 2015 was almost entirely offset by a $3.3 million decrease in manufacturing conversion and other costs. Overhead cost increased due to additional resources to support sizable growth in strategic served markets and increased wages. Manufacturing conversion and other costs decreased due primarily to improved manufacturing cost efficiencies in our operations, including benefits derived from recent investments at our Trentwood facility.

The table below provides shipment and value added revenue information (in millions of dollars except shipments and value added revenue per pound) for each of the product categories (which are based on end market applications) of our Fabricated Products segment for each period presented:

	Quarter Ended March 31,
	2016						2015
Aero/HS Products:
Shipments (mmlbs)	63.7						61.9
	$			$ / lb			$			$ / lb
Net sales	$	176.9		$	2.78		$	180.3		$	2.91
Less: Hedged Cost of Alloyed Metal	(54.3		)	(0.86		)	(69.1		)	(1.11		)
Value added revenue	$	122.6		$	1.92		$	111.2		$	1.80
Automotive Extrusions:
Shipments (mmlbs)	24.5						22.1
	$			$ / lb			$			$ / lb
Net sales	$	48.4		$	1.98		$	50.1		$	2.27
Less: Hedged Cost of Alloyed Metal	(19.7		)	(0.81		)	(24.4		)	(1.11		)
Value added revenue	$	28.6		$	1.17		$	25.7		$	1.16
GE Products:
Shipments (mmlbs)	63.1						60.4
	$			$ / lb			$			$ / lb
Net sales	$	105.4		$	1.67		$	119.1		$	1.97
Less: Hedged Cost of Alloyed Metal	(52.0		)	(0.83		)	(67.5		)	(1.12		)
Value added revenue	$	53.3		$	0.84		$	51.6		$	0.85
Other Products:
Shipments (mmlbs)	8.0						13.5
	$			$ / lb			$			$ / lb
Net sales	$	12.5		$	1.56		$	22.2		$	1.64
Less: Hedged Cost of Alloyed Metal	(6.4		)	(0.80		)	(13.5		)	(1.00		)
Value added revenue	$	6.1		$	0.76		$	8.7		$	0.64
Total:
Shipments (mmlbs)	159.3						157.9
	$			$ / lb			$			$ / lb
Net sales	$	343.2		$	2.15		$	371.7		$	2.35
Less: Hedged Cost of Alloyed Metal	(132.5		)	(0.83		)	(174.5		)	(1.10		)
Value added revenue	$	210.7		$	1.32		$	197.2		$	1.25

For the quarter ended March 31, 2016, Net sales of Fabricated Products decreased by 8% to $343.2 million, as compared to the quarter ended March 31, 2015, reflecting a 9% decrease in average realized sales price per pound, partially offset by a slight

43

increase in Fabricated Products segment shipment volume as discussed in further detail above in "Consolidated Results of Operations."

Outlook

Our full year 2016 outlook remains unchanged as we anticipate a 3% to 5% year-over-year increase in our total value added revenue driven primarily by sales growth in our aerospace and automotive applications. We also reiterate our outlook for approximately 5% growth in value added revenue for our aerospace and high strength applications, approximately 10% growth in value added revenue for automotive extrusions and relatively flat demand for our general engineering and industrial applications. Year-over-year improvement in operating income (excluding non-run-rate items) is expected to be driven by higher sales volume, increased operating leverage, solid sales margins and continued improvement in manufacturing efficiencies. Import pressure on general engineering plate is expected to continue to negatively impact sales prices and margins through 2016.

All Other

All Other provides support for our operations and incurs general and administrative expenses that are not allocated to the Fabricated Products segment. All Other is not considered a reportable segment. The table below presents the impact of non-run-rate items to operating loss within the All Other business unit for each period presented (in millions of dollars):

	Quarter Ended March 31,
	2016			2015
Operating loss	$	(13.1	)	$	(503.5	)
Impact to operating loss of non-run-rate items:
Net periodic post retirement benefit cost relating to Salaried VEBA	(0.8		)	(0.6		)
Gain (loss) on removal of Union VEBA net assets1	0.1			(492.2		)
Total non-run-rate items	(0.7		)	(492.8		)
Operating loss excluding non-run-rate items	$	(12.4	)	$	(10.7	)

_____________________

¹  See Note 5 of Notes to Interim Consolidated Financial Statements included in this Report for additional information relating to the VEBAs.

All Other operating loss excluding non-run-rate items for the quarter ended March 31, 2016 was $1.7 million highercompared to the same period in 2015. The increase was due primarily to an increase of $1.4 million in employee incentive compensation expense and a $0.2 million increase in salaries and benefits.

Liquidity and Capital Resources

Summary

The following table summarizes our liquidity at the dates presented (in millions of dollars):

	March 31, 2016		December 31, 2015
Available cash and cash equivalents	$	70.7	$	72.5
Short-term investments	10.0		30.0
Net borrowing availability under Revolving Credit Facility after borrowings and letters of credit	291.8		280.8
Total liquidity	$	372.5	$	383.3

Cash equivalents consist primarily of money market accounts and investments with an original maturity of 90 days or less when purchased. We place our cash in bank deposits and money market funds with high credit quality financial institutions, which invest primarily in commercial paper and time deposits of prime quality, short-term repurchase agreements and U.S. government agency notes. Short-term investments represent holdings in investment-grade commercial paper and corporate bonds with a maturity of greater than 90 days.

44

In addition to our unrestricted cash and cash equivalents described above, we have restricted cash that is pledged or held as collateral in connection with workers' compensation requirements and certain other agreements. From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash (see Note 2 of Notes to Interim Consolidated Financial Statements included in this Report).

We and certain of our subsidiaries have a credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the other financial institutions party thereto ("Revolving Credit Facility") (see Note 3 of Notes to Interim Consolidated Financial Statements included in this Report). There were no borrowings under our Revolving Credit Facility as of March 31, 2016, or as of December 31, 2015.

Cash Flows

The following table summarizes our cash flows from operating, investing and financing activities for each period presented (in millions of dollars):

	Three Months Ended March 31,
	2016			2015
Total cash provided by (used in):
Operating activities:
Fabricated Products	$	52.0		$	34.1
All Other	(30.7		)	(26.7		)
Total cash provided by operating activities	$	21.3		$	7.4
Investing activities:
Fabricated Products	$	(25.8	)	$	(11.2	)
All Other	19.9			83.9
Total cash (used in) provided by investing activities	$	(5.9	)	$	72.7
Financing activities:
Fabricated Products	$	—		$	(0.1	)
All Other	(17.2		)	(36.8		)
Total cash used in financing activities	$	(17.2	)	$	(36.9	)

Operating Activities

Fabricated Products – For the quarter ended March 31, 2016, Fabricated Products segment operating activities provided $52.0 million of cash. Cash provided in the quarter ended March 31, 2016 was primarily related to: (i) $57.9 million ofoperating income; (ii) adjustments for non-cash items and depreciation and amortization of $4.7 million; (iii) a decrease in inventory of $9.0 million due to a reduction in inventory, as well as a $4.9 million lower of cost or market charge; (iv) an increase in accounts payable and other accrued liabilities of $4.1 million due to an increase in general business activities and the timing of payments, partially offset by an increase in accounts receivable of $24.4 million due primarily to sales made later in the quarter.

Fabricated Products segment operating activities provided $34.1 million of cash during the quarter ended March 31, 2015. Cash provided in the quarter ended March 31, 2015 was primarily related to: (i) $44.9 million of operating income; (ii) adjustments for non-cash items and depreciation and amortization of $13.2 million; (iii) an increase in accounts payable and other accrued liabilities of $1.8 million due to an increase in general business activities and the timing of payments, partially offset by (iv) an increase in accounts receivable of $19.1 million due primarily to sales made later in the quarter; and (v) an increase in inventory of $3.3 million due primarily to increased shipment volume.

For additional information regarding Fabricated Products operating income excluding non-run-rate items, see "Results of Operations – Segment and Business Unit Information" above.

All Other – Cash used in operating activities of $30.7 million during the quarter ended March 31, 2016 consisted primarily of payments relating to: (i) general and administrative costs of $7.2 million; (ii) an annual variable cash contribution to the VEBAs of $19.5 million with respect to the 2015 year; (iii) our short-term incentive program in the amount of $3.6 million; and (iv) interest on the Revolving Credit Facility of $0.3 million.

45

Cash used in operating activities of $26.7 million during the quarter ended March 31, 2015 consisted primarily of payments relating to: (i) general and administrative costs of $8.6 million; (ii) an annual variable cash contribution to the VEBAs of $13.7 million with respect to the 2014 year; and (iii) our short-term incentive program in the amount of $3.4 million.

Investing Activities

Fabricated Products – Cash used in investing activities for the Fabricated Products segment during the quarter ended March 31, 2016 was $25.8 million, compared to $11.2 million of cash used during the quarter ended March 31, 2015. Cash used during the quarters ended March 31, 2016 and March 31, 2015 was substantially related to capital expenditures.

All Other – Cash provided by investing activities for All Other was $19.9 million during the quarter ended March 31, 2016 and primarily consisted of proceeds from the disposition of available for sale securities. Cash provided by investing activities for All Other during the quarter ended March 31, 2015 was $83.9 million and primarily consisted of proceeds from the disposition of available for sale securities. A portion of the proceeds was used to settle the Convertible Notes on April 1, 2015.

Financing Activities

Fabricated Products – There was no cash flow activity in financing activities for the quarter ended March 31, 2016. Cash used in financing activities for the quarter ended March 31, 2015 was $0.1 million, relating to the repayment of a capital lease liability.

All Other – Cash used in financing activities during the quarter ended March 31, 2016 was $17.2 million, representing: (i) $6.3 million of cash used to repurchase our common stock under our stock repurchase program; (ii) $8.2 million of cash dividends paid to our stockholders, including holders of restricted stock, and dividend equivalents paid to holders of certain restricted stock units and to holders of performance shares granted prior to 2014, with respect to the target number of underlying shares of common stock (constituting approximately one-half of the maximum payout); and (iii) $2.7 million of cash used to repurchase our common stock to satisfy withholding taxes resulting from the vesting of employee restricted stock, restricted stock units and performance shares.

Cash used in financing activities during the quarter ended March 31, 2015 was $36.8 million, representing: (i) $28.2 million of cash used to repurchase our common stock under our stock repurchase program; (ii) $7.1 million of cash dividends paid to our stockholders, including holders of restricted stock, and dividend equivalents paid to holders of certain restricted stock units and to holders of performance shares granted prior to 2014, with respect to the target number of underlying shares of common stock (constituting approximately one-half of the maximum payout); and (iii) $2.5 million of cash used to repurchase our common stock to satisfy withholding taxes resulting from the vesting of employee restricted stock, restricted stock units and performance shares. Cash used in financing activities during the quarter ended March 31, 2015 was partially offset by $1.0 million of additional tax benefit in connection with the vesting of employee non-vested shares, restricted stock units and performance shares.

Sources of Liquidity

We believe our available cash and cash equivalents, short-term investments, borrowing availability under the Revolving Credit Facility and funds generated from operations are our most significant sources of liquidity. We believe these sources will be sufficient to finance our cash requirements and our planned capital expenditures and investments for at least the next 12 months. Nevertheless, our ability to fund our working capital requirements, debt service obligations, the full amount of any variable cash contribution to the VEBAs and planned capital expenditures and investments will depend upon our future operating performance (which will be affected by prevailing economic conditions) and financial, business and other factors, some of which are beyond our control.

The Revolving Credit Facility matures in December 2020 and provides for borrowings up to $300.0 million (subject to borrowing base limitations).

46

The table below summarizes recent availability and usage of our Revolving Credit Facility (in millions of dollars except for borrowing rate):

	April 18, 2016			March 31, 2016
Revolving Credit Facility borrowing commitment	$	300.0		$	300.0
Borrowing base availability	290.9			299.1
Less: Outstanding borrowings under Revolving Credit Facility	—			—
Less: Outstanding letters of credit under Revolving Credit Facility	(7.3		)	(7.3		)
Net remaining borrowing availability	$	283.6		$	291.8
Borrowing rate (if applicable)1	3.75		%	3.75		%

_______________________

¹  Such borrowing rate, if applicable, represents the interest rate for any overnight borrowings under the Revolving Credit Facility.

We do not believe that covenants contained in the Revolving Credit Facility are reasonably likely to limit our ability to raise additional debt or equity should we choose to do so during the next 12 months, nor do we believe it is likely that during the next 12 months we will trigger the availability threshold that would require measuring and maintaining a fixed charge coverage ratio.

See Note 3 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2015 for information regarding our Revolving Credit Facility.

Debt

See "Contractual Obligations, Commercial Commitments and Off-Balance Sheet and Other Arrangements - Contractual Obligations and Commercial Commitments" included in Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report on Form 10-K for the year ended December 31, 2015 for mandatory principal and cash interest payments on the outstanding borrowings.

We do not believe that covenants in the indenture governing the Senior Notes are reasonably likely to limit our ability to obtain additional debt or equity financing should we choose to do so during the next 12 months.

Capital Expenditures and Investments

A component of our long-term strategy is our capital expenditure program. We recently commenced a multi-year, $150.0 million capital investment project at our Trentwood facility focused on: (i) equipment upgrades throughout the process flow to reduce conversion costs and increase efficiency; (ii) modernizing our legacy equipment and process flow for thin gauge plate to achieve KaiserSelect^® quality enhancements for these aerospace and general engineering products; and (iii) the further expansion of Trentwood's manufacturing capacity. Total capital expenditures were $25.9 million and $11.3 million for the quarter ended March 31, 2016 and March 31, 2015, respectively.

Capital spending during the quarter ended March 31, 2016 was due primarily to capital upgrades at several of our extrusion facilities to support new automotive programs that will launch over the next few years and continued spending on the $150.0 million modernization project at our Trentwood facility. The rest of our capital spending was spread among our manufacturing locations on projects expected to continue to reduce operating costs, improve quality, increase capacity or enhance operational security. In 2016, we anticipate capital spending will be in the $60.0 million to $80.0 million range for purposes of: (i) continuing our capacity expansions for Automotive Extrusions; (ii) continued spending on the $150.0 million modernization project at our Trentwood facility; (iii) other manufacturing cost efficiency and quality initiatives; and (iv) sustaining capital spending. Capital investment will be funded using cash generated from operations, available cash and cash equivalents, short-term investments, borrowings under the Revolving Credit Facility and/or other third-party financing arrangements. The level of anticipated capital expenditures may be adjusted from time to time depending on our business plans, our price outlook for fabricated aluminum products, our ability to maintain adequate liquidity and other factors. No assurance can be provided as to the timing of any such expenditures or the operational benefits expected therefrom.

47

Dividends

See Note 10 and Note 16 of Notes to Interim Consolidated Financial Statements included in this Report for information regarding dividends paid during the quarters ended March 31, 2016 and March 31, 2015, and declared subsequent to March 31, 2016.

The future declaration and payment of dividends, if any, will be at the discretion of our Board of Directors and will depend on a number of factors, including our financial and operating results, financial condition and anticipated cash requirements and covenants contained in the Revolving Credit Facility, the indenture for our 8.25% Senior Notes due 2020, or other indebtedness we may incur in the future. We can give no assurance that dividends will be declared and paid in the future. See Note 3 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2015 for additional information about restrictions on dividend payments.

Repurchases of Common Stock

See Note 10 of Notes to Interim Consolidated Financial Statements included in this Report for information regarding repurchases of common stock made during the quarters ended March 31, 2016 and March 31, 2015 and the amounts authorized and available for future repurchases of common stock under our stock repurchase program.

See Note 6 of Notes to Interim Consolidated Financial Statements included in this Report for information regarding minimum statutory tax withholding obligations arising during the quarters ended March 31, 2016 and March 31, 2015 in connection with the vesting of non-vested shares, restricted stock units and performance shares.

Restrictions Related to Equity Capital

Our certificate of incorporation places restrictions on the transfer of our common shares to reduce the risk that an ownership change within the criteria under Section 382 of the Internal Revenue Code of 1986 would jeopardize our ability to fully use our federal income tax attributes. These transfer restrictions will expire in accordance with their terms on July 6, 2016. At our 2016 Annual Meeting of Stockholders, we intend to seek stockholder approval of: (i) an amendment to our certificate of incorporation that would implement stock transfer restrictions to replace those that are expiring and (ii) a Tax Asset Protective Rights Plan (“Rights Plan”) that our Board of Directors adopted on April 7, 2016. Both the amendment to our certificate of incorporation and the Rights Plan are designed to preserve our ability to use our federal income tax attributes without limitations.

Environmental Commitments and Contingencies

See Note 7 of Notes to Interim Consolidated Financial Statements included in this Report for information regarding our environmental commitments and contingencies.

Contractual Obligations, Commercial Commitments and Off-Balance Sheet and Other Arrangements

During the quarter ended March 31, 2016, we granted additional stock-based awards to certain members of management and our non-employee directors under our equity and performance incentive plan (see Note 6 of Notes to Interim Consolidated Financial Statements included in this Report). Additional awards are expected to be made in future years.

In accordance with our funding obligation to the VEBAs (see Note 5 of Notes to Interim Consolidated Financial Statements included in this Report), we paid $19.5 million to the VEBAs during the first quarter of 2016 with respect to 2015.

See Note 7 of Notes to Interim Consolidated Financial Statements included in this Report for more information on purchase obligations we incurred during the quarter ended March 31, 2016.

With the exception of the above-mentioned transactions and as otherwise disclosed herein, there has been no material change in our contractual obligations, commercial commitments, off-balance sheet or other arrangements other than in the ordinary course of business since December 31, 2015.

48

Critical Accounting Estimates and Policies

Our consolidated financial statements are prepared in accordance with GAAP. In connection with the preparation of our financial statements, we are required to make assumptions and estimates about future events, and apply judgments that affect the reported amounts of assets, liabilities, revenue and expenses and the related disclosures. We base our assumptions, estimates and judgments on historical experience, current trends and other factors that management believes to be relevant at the time our consolidated financial statements are prepared. On a regular basis, management reviews the accounting policies, assumptions, estimates and judgments to ensure that our financial statements are presented fairly and in accordance with GAAP. However, because future events and their effects cannot be determined with certainty, actual results could differ from our assumptions and estimates and such differences could be material.

Our significant accounting policies are discussed in Note 1 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2015 and Note 1 of Notes to Interim Consolidated Financial Statements included in this Report. We discuss our critical accounting estimates in Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Annual Report on Form 10-K for the year ended December 31, 2015. There has been no material change in our critical accounting estimates and policies since December 31, 2015.

New Accounting Pronouncements

For a discussion of all recently adopted and recently issued but not yet adopted accounting pronouncements, see "New Accounting Pronouncements" in Note 1 of Notes to Interim Consolidated Financial Statements included in this Report.

Available Information

Our website is located at www.kaiseraluminum.com. The website includes a section for investor relations under which we provide notifications of news or announcements regarding our financial performance, including Securities and Exchange Commission ("SEC") filings, investor events and press and earnings releases. In addition, all Kaiser Aluminum Corporation filings submitted to the SEC, including our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and Proxy Statements for our annual meeting of stockholders, as well as other Kaiser Aluminum Corporation reports and statements, are available on the SEC's web site at www.sec.gov. Such filings are also available for download free of charge on our website. In addition, we provide and archive on our website webcasts of our quarterly earnings calls and certain events in which management participates or hosts with members of the investment community, and related investor presentations. The contents of the website are not intended to be incorporated by reference into this Report or any other report or document filed by us, and any reference to the websites are intended to be inactive textual references only.

Item 3.Quantitative and Qualitative Disclosures About Market Risk

Our operating results are sensitive to changes in the prices of primary aluminum and fabricated aluminum products and also depend to a significant degree upon the volume and mix of all products sold. As discussed more fully in Note 8 of Notes to Interim Consolidated Financial Statements included in this Report, we have historically utilized hedging transactions to lock in a specified price or range of prices for certain products which we sell or consume in our production process and to mitigate our exposure to changes in energy prices and foreign currency exchange rates.

Aluminum

See Note 8 of Notes to Interim Consolidated Financial Statements included in this Report, under "Hedges of Operational Risk" for a discussion of our pricing of fabricated aluminum, firm-price arrangements and third-party hedging instruments.

During the quarters ended March 31, 2016 and March 31, 2015, settlements of derivative contracts covering, in millions of pounds, 52.0 and 41.1, respectively, hedged Fabricated Products shipments sold on pricing terms that created metal price risk for us. At March 31, 2016, we had derivative contracts with respect to approximately, in millions of pounds, 118.6 and 9.6 to hedge sales to be made in 2016 and 2017, respectively, on pricing terms that create metal price risk for us.

Based on the aluminum derivative positions held by us to hedge firm-price customer sales agreements, we estimate that a $0.10 per pound decrease in the London Metal Exchange market price of aluminum, with all other variables held constant, would have resulted in an unrealized mark-to-market loss of $12.6 million and $12.9 million on March 31, 2016 and December 31, 2015, respectively, with corresponding changes to the net fair value of our aluminum derivative positions. Additionally, we estimate that a $0.01 per pound decrease in the Midwest premium for aluminum, with all other variables held constant, would have resulted in an unrealized mark-to-market loss of $0.9 million and $0.8 million on March 31, 2016 and

49

December 31, 2015, respectively. The balances of such financial instruments may change in future periods, and therefore the amounts discussed above may not be indicative of future results.

If we encounter reductions in the price of aluminum and/or if we further encounter a decrease in our net realizable value of inventory, we may be subject to additional inventory lower of cost or market value adjustments.

Energy

We are exposed to energy price risk from fluctuating prices for natural gas and electricity. We estimate that, before consideration of any hedging activities and the potential to pass through higher natural gas and electricity prices to customers, each $1.00 change in natural gas prices (per mmbtu) and electricity prices (per mwh) would impact our 2016 annual operating costs by approximately $3.1 million and $0.4 million, respectively. We, from time to time, in the ordinary course of business, enter into hedging transactions and/or physical delivery commitments with firm prices with third parties to mitigate our risk from fluctuations in natural gas and electricity prices.

As of March 31, 2016, we had derivative and/or physical delivery commitments with energy companies in place to cover our exposure to fluctuations in natural gas prices for approximately 79%, 73% and 72% of the expected natural gas purchases for the remainder of 2016, 2017 and 2018, respectively. We estimate that a $1.00 per mmbtu decrease in natural gas prices would have resulted in an unrealized mark-to-market loss of $6.7 million and $7.0 million on March 31, 2016 and December 31, 2015, respectively, with corresponding changes to the net fair value of our natural gas derivative positions.

Additionally, as of March 31, 2016, we had physical delivery commitments with firm prices covering approximately 54% of the expected electricity purchases for the remainder of 2016 and 2017, and 27% for 2018.

The balances of such financial instruments for hedging of natural gas and electricity may change in future periods, and therefore the amounts discussed above may not be indicative of future results.

Foreign Currency

As of March 31, 2016, we had cash commitments outstanding for equipment purchases denominated in euros, of which we have hedged our exposure to currency exchange rate fluctuations by entering into foreign currency forward contracts with settlement dates designed to line up with the timing of scheduled payments to the foreign equipment manufacturers. These derivative instruments are designated and qualify as cash flow hedges, therefore periodic gain and loss related to market value adjustments are deferred in Accumulated other comprehensive loss until depreciation on the underlying equipment commences. See Note 8 of Notes to Interim Consolidated Financial Statements included in this Report for additional information relating to these foreign currency forward contracts. As of March 31, 2016, we hedged our equipment purchase transactions denominated in euros using forward contracts with settlement dates through August 2017. We estimate that a 10% decrease in the March 31, 2016 exchange rate of euros to US dollars would have resulted in an unrealized mark-to-market loss of $0.5 million as of March 31, 2016.

Other than the cash flow hedges discussed above, there have been no other changes or developments that would materially affect the foreign currency risk assessment performed as of March 31, 2016.

Item 4.Controls and Procedures

Evaluation of Disclosure Controls and Procedures. We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our reports under the Securities Exchange Act of 1934 is processed, recorded, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms and that such information is accumulated and communicated to management, including the principal executive officer and principal financial officer, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures. An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures was performed as of the end of the period covered by this Report under the supervision of and with the participation of our management, including the principal executive officer and principal financial officer. Based on that evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of March 31, 2016 at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting. We had no changes in our internal control over financial reporting during the quarter ended March 31, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

50

PART II – OTHER INFORMATION

Item 1.Legal Proceedings

Reference is made to Part I, Item 3. "Legal Proceedings" included in our Annual Report on Form 10-K for the year ended December 31, 2015 for information concerning material legal proceedings with respect to the Company. There have been no material developments since December 31, 2015.

Item 1A.Risk Factors

Reference is made to Part I, Item 1A. "Risk Factors" included in our Annual Report on Form 10-K for the year ended December 31, 2015 for information concerning risk factors. There have been no material changes in risk factors since December 31, 2015.

Item 2.Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information regarding our repurchases of our common shares during the quarter ended March 31, 2016:

	Amended and Restated 2006 Equity and Performance Incentive Plan			Stock Repurchase Plan
	Total Number of Shares Purchased1	Average Price per Share		Total Number of Shares Purchased2	Average Price per Share		Maximum Dollar Value of Shares that May Yet Be Purchased Under the Programs (millions)2
January 1, 2016 - January 31, 2016	—	$	—	34,812	$	76.67	$	120.6
February 1, 2016 - February 29, 2016	2,811	76.25		37,484	75.74		$	117.8
March 1, 2016 - March 31, 2016	32,351	80.46		10,969	81.17		$	116.9
Total	35,162	$	80.12	83,265	$	76.85	N/A

__________________________

¹  Under our equity and performance incentive plan, participants may elect to have us withhold common shares to satisfy minimum statutory tax withholding obligations arising from the recognition of income and the vesting of restricted stock, restricted stock units and performance shares. When we withhold these shares, we are required to remit to the appropriate taxing authorities the market price of the shares withheld by us on the date of withholding. The withholding of common shares by us could be deemed a purchase of such common shares. During the quarter ended March 31, 2016, we withheld 35,162 shares of common stock to satisfy employee tax withholding obligations. All such shares were withheld and canceled by us on the applicable vesting dates or dates on which income to the employees was recognized, and the number of shares withheld was determined based on the closing price per common share as reported on the Nasdaq Global Select Market on such dates.

²  Of the $116.9 million that as of March 31, 2016 may yet be used to purchase our shares pursuant to the stock repurchase plan, $16.9 million is part of the $75.0 million that was authorized in December 2013 and $100.0 million was authorized in April 2015. Repurchase transactions will occur at such times and prices as management deems appropriate and will be funded with our excess liquidity after giving consideration to internal and external growth opportunities and future cash flows. Repurchases may be in open-market transactions or in privately negotiated transactions, and the program may be modified or terminated by our Board of Directors at any time.

Item 3.Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

51

Item 5.Other Information

As discussed in Note 1 of Notes to Interim Consolidated Financial Statements included in this Report, we retrospectively adopted Accounting Standards Update 2015-03, which resulted in the following reclassification adjustments for the period presented related to deferred financing costs (in millions of dollars):

	December 31, 2014 (As Reported)		Adjustments for Retrospective Adoption			December 31, 2014 (As Adjusted)
ASSETS
Current assets:
Prepaid expenses and other current assets	$	178.6	$	(0.3	)	$	178.3
Total current assets	825.2		(0.3		)	824.9
Other assets	23.3		(4.4		)	18.9
Total	$	1,743.7	$	(4.7	)	$	1,739.0
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of long-term debt	$	172.5	$	(0.3	)	$	172.2
Total current liabilities	426.4		(0.3		)	426.1
Long-term debt	225.0		(4.4		)	220.6
Total liabilities	727.8		(4.7		)	723.1
Total stockholders' equity	1,015.9		—			1,015.9
Total	$	1,743.7	$	(4.7	)	$	1,739.0

52

Item 6.Exhibits

Exhibit Number	Description
10.1	2016 Short-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
10.2	2016 Form of Executive Officer Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
10.3	Kaiser Aluminum Corporation 2016 - 2018 Long-Term Incentive Plan Management Objectives and Formula for Determining Performance Shares Earned Summary (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
*10.4	Description of 2016 Short-Term Incentive Umbrella Plan under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan.
*10.5	Description of 2016-2018 Long-Term Incentive Umbrella Plan under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan.
*31.1	Certification of Jack A. Hockema pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*31.2	Certification of Daniel J. Rinkenberger pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*32.1	Certification of Jack A. Hockema pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*32.2	Certification of Daniel J. Rinkenberger pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
* 101.INS	XBRL Instance
* 101.SCH	XBRL Taxonomy Extension Schema
*101.CAL	XBRL Taxonomy Extension Calculation
* 101.DEF	XBRL Taxonomy Extension Definition
* 101.LAB	XBRL Taxonomy Extension Label
* 101.PRE	XBRL Taxonomy Extension Presentation

* Filed herewith.

53

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

KAISER ALUMINUM CORPORATION

/s/ Daniel J. Rinkenberger

Daniel J. Rinkenberger 

Executive Vice President and Chief Financial Officer

(Principal Financial Officer) 

/s/ Neal West  

Neal West 

Vice President and Chief Accounting Officer

(Principal Accounting Officer) 

Date: April 22, 2016

54

INDEX TO EXHIBITS

Exhibit Number	Description
10.1	2016 Short-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
10.2	2016 Form of Executive Officer Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
10.3	Kaiser Aluminum Corporation 2016 - 2018 Long-Term Incentive Plan Management Objectives and Formula for Determining Performance Shares Earned Summary (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K, filed by the Company on March 10, 2016, File No. 000-52105).
*10.4	Description of 2016 Short-Term Incentive Umbrella Plan under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan.
*10.5	Description of 2016-2018 Long-Term Incentive Umbrella Plan under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan.
*31.1	Certification of Jack A. Hockema pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*31.2	Certification of Daniel J. Rinkenberger pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*32.1	Certification of Jack A. Hockema pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*32.2	Certification of Daniel J. Rinkenberger pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
* 101.INS	XBRL Instance
* 101.SCH	XBRL Taxonomy Extension Schema
*101.CAL	XBRL Taxonomy Extension Calculation
* 101.DEF	XBRL Taxonomy Extension Definition
* 101.LAB	XBRL Taxonomy Extension Label
* 101.PRE	XBRL Taxonomy Extension Presentation

* Filed herewith.

55

EX-10.4

Exhibit 10.4

2016 STI Umbrella Plan

2016 Performance Goal and Bonus Pool

The performance goal for the STI Performance Period shall be $5.0 million in Net cash provided by operating activities, as reported in the Company’s Statements of Consolidated Cash Flows (“Cash Flow”). The bonus pool, representing the amount available for payment of bonuses, shall equal 15% of Cash Flow.

Allocation of Bonus Pool to Executives

Executive Name	Executive Title	Percent of Pool Allocated to Executive1
Jack A. Hockema	Chief Executive Officer	37.9755%
Keith A. Harvey	President and Chief Operating Officer	26.2006%
John M. Donnan	EVP - Legal, Compliance and Human Resources	17.1753%
John Barneson	SVP - Corporate Development	10.3076%
[Other Designated Participant]	[Designated Participant Title]	8.3410%

¹ Subject to an aggregate maximum bonus opportunity per executive of $5.0 million per calendar year, pursuant to the Equity Incentive Plan.

Administrative Provisions

The 2016 STI Umbrella Plan only applies to the calculation and award of incentive awards, if any. There will be no duplication of benefits created by the 2016 STI Umbrella Plan.

The 2016 STI Umbrella Plan will not increase any benefits that may be payable under any severance and/or change in control agreements.

EX-10.5

Exhibit 10.5

2016-2018 LTI Umbrella Plan

2016-2018 Performance Goal and Award Pool

The performance goal for the LTI Performance Period shall be an average of $5.0 million per year over the LTI Performance Period in Net cash provided by operating activities, as reported in the Company’s Statements of Consolidated Cash Flows (“Cash Flow”). The maximum value of shares of common stock issuable upon reaching performance goal shall equal 15% of the aggregate Cash Flow over the LTI Performance Period.

Allocation of Award Pool to Executives

Executive Name	Executive Title	Percent of Pool Allocated to Executive1
Jack A. Hockema	Chief Executive Officer	49.2523%
Keith A. Harvey	President and Chief Operating Officer	26.5257%
John M. Donnan	EVP - Legal, Compliance and Human Resources	10.5066%
John Barneson	SVP - Corporate Development	8.6157%
[Other Designated Participant]	[Designated Participant Title]	5.0997%

¹ Subject to an aggregate maximum value per executive of $5.0 million and an aggregate maximum of 500,000 shares of common stock per executive per calendar year, pursuant to the Equity Incentive Plan.

Administrative Provisions

The 2016-2018 LTI Umbrella Plan only applies to the calculation and award of incentive awards, if any. There will be no duplication of benefits created by the 2016-2018 LTI Umbrella Plan.

The 2016-2018 LTI Umbrella Plan will not increase any benefits that may be payable under any severance and/or change in control agreements

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Jack A. Hockema, certify that:

1.I have reviewed this report on Form 10-Q of Kaiser Aluminum Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

		/s/ Jack A. Hockema
		Jack A. Hockema
		President and Chief Executive Officer
Date:	April 22, 2016

A signed original of this written statement required by Section 302 has been provided to Kaiser Aluminum Corporation and will be retained by Kaiser Aluminum Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Daniel J. Rinkenberger, certify that:

1.I have reviewed this report on Form 10-Q of Kaiser Aluminum Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

		/s/ Daniel J. Rinkenberger
		Daniel J. Rinkenberger
		Executive Vice President and Chief Financial Officer
Date:	April 22, 2016

A signed original of this written statement required by Section 302 has been provided to Kaiser Aluminum Corporation and will be retained by Kaiser Aluminum Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

April 22, 2016

In connection with the Quarterly Report on Form 10-Q by Kaiser Aluminum Corporation, a Delaware corporation (the “Company”), for the quarter ended March 31, 2016 (the “Report”), as filed on the date hereof with the Securities and Exchange Commission, the undersigned, Jack A. Hockema, President and Chief Executive Officer of the Company, does hereby certify, pursuant to 18 U.S.C. 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to such officer’s knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

IN WITNESS WHEREOF, the undersigned has executed this certification as of the date first above written.

/s/ Jack A. Hockema

Jack A. Hockema

President and Chief Executive Officer

A signed original of this written statement required by Section 906 has been provided to Kaiser Aluminum Corporation and will be retained by Kaiser Aluminum Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

April 22, 2016

In connection with the Quarterly Report on Form 10-Q by Kaiser Aluminum Corporation, a Delaware corporation (the “Company”), for the quarter ended March 31, 2016 (the “Report”), as filed on the date hereof with the Securities and Exchange Commission, the undersigned, Daniel J. Rinkenberger, Executive Vice President and Chief Financial Officer of the Company, does hereby certify, pursuant to 18 U.S.C. 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to such officer’s knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

IN WITNESS WHEREOF, the undersigned has executed this certification as of the date first above written.

/s/ Daniel J. Rinkenberger

Daniel J. Rinkenberger

Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to Kaiser Aluminum Corporation and will be retained by Kaiser Aluminum Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 18, 2016
Document Information [Line Items]
Entity Registrant Name	Kaiser Aluminum Corp
Entity Central Index Key	0000811596
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		17,982,909

XML

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 70.7	$ 72.5
Short-term investments		10.0	30.0
Receivables:
Trade receivables – net		138.8	116.7
Other		8.6	6.1
Inventories		210.6	219.6
Prepaid expenses and other current assets1	[1]	9.1	56.7
Total current assets		447.8	501.6
Property, plant and equipment – net		504.5	495.4
Deferred tax assets – net1, 2	[1],[2]	197.5	163.3
Intangible assets – net		30.1	30.5
Goodwill		37.2	37.2
Other assets1	[1]	19.5	19.6
Total		1,236.6	1,247.6
Current liabilities:
Accounts payable		70.2	76.7
Accrued salaries, wages and related expenses		33.9	39.8
Other accrued liabilities		56.5	52.7
Short-term capital leases		0.1	0.1
Total current liabilities		160.7	169.3
Net liabilities of Salaried VEBA		18.7	19.0
Deferred tax liabilities		2.1	2.1
Long-term liabilities		72.5	87.5
Long-term debt1	[1]	194.8	194.6
Total liabilities		$ 448.8	$ 472.5
Commitments and contingencies – Note 7
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both March 31, 2016 and December 31, 2015; no shares were issued and outstanding at March 31, 2016 and December 31, 2015		$ 0.0	$ 0.0
Common stock, par value $0.01, 90,000,000 shares authorized at both March 31, 2016 and at December 31, 2015; 22,307,219 shares issued and 17,986,521 shares outstanding at March 31, 2016; 22,291,180 shares issued and 18,053,747 shares outstanding at December 31, 2015		0.2	0.2
Additional paid in capital2	[2]	1,037.2	1,037.3
Retained earnings2	[2]	34.1	15.8
Treasury stock, at cost, 4,320,698 shares at March 31, 2016 and 4,237,433 shares at December 31, 2015, respectively		(252.9)	(246.5)
Accumulated other comprehensive loss		(30.8)	(31.7)
Total stockholders' equity		787.8	775.1
Total		$ 1,236.6	$ 1,247.6

[1] See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

[2] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Stockholders' equity:
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	90,000,000	90,000,000
Common Stock, shares issued	23,307,219	22,291,180
Common stock, shares outstanding	17,986,521	18,053,747
Treasury stock, shares	4,320,698	4,237,433

XML

Statements of Consolidated Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net sales	$ 343.2	$ 371.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	262.0	302.3
Inventory Write-down	4.9	0.0
Unrealized (gain) loss on derivative instruments	(4.0)	4.5
Depreciation and amortization	8.7	8.0
Selling, general, administrative, research and development	26.1	22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	(0.1)	492.2
Total selling, general, administrative, research and development	26.8	515.5
Total costs and expenses	298.4	830.3
Operating income (loss)	44.8	(458.6)
Other (expense) income:
Interest expense	(3.7)	(9.8)
Other income, net	0.3	0.4
Income (loss) before income taxes	41.4	(468.0)
Income tax (provision) benefit	(15.1)	175.8
Net income (loss)	$ 26.3	$ (292.2)
Net income (loss) per common share:
Basic	$ 1.47	$ (16.85)
Diluted	$ 1.44	$ (16.85)
Weighted-average number of common shares outstanding (in thousands):
Basic	17,864	17,344
Diluted	18,200	17,344
Common Stock, Dividends, Per Share, Declared	$ 0.45	$ 0.40

XML

Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 26.3	$ (292.2)
Reclassification adjustments:
Amortization of net actuarial loss	0.1	0.3
Amortization of prior service cost	1.0	0.7
Removal of obligation relating to Union VEBA	0.0	106.6
Other comprehensive income relating to VEBAs	(1.1)	(107.6)
Available for sale securities:
Reclassification of unrealized loss upon sale of available for sale securities	0.0	(0.1)
Other comprehensive income relating to available for sale securities	0.0	0.1
Foreign currency translation gain on Canadian pension plan	0.1	0.0
Unrealized gain on foreign currency cash flow hedges	0.2	0.0
Foreign currency translation gain	0.0	0.1
Other comprehensive income, before tax	1.4	107.8
Income tax expense related to items of other comprehensive income	(0.5)	(40.9)
Other comprehensive income, net of tax	0.9	66.9
Comprehensive income (loss)	$ 27.2	$ (225.3)

XML

Statement of Consolidated Stockholders' Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment	[1]	$ 0.7		$ 0.8	$ (0.1)
Stockholders' equity, adjusted balance		$ 775.1	$ 0.2	1,037.3	15.8	$ (246.5)	$ (31.7)
Beginning balance, shares (Scenario, Previously Reported) at Dec. 31, 2015			18,053,747
Beginning balance, shares at Dec. 31, 2015		18,053,747	18,053,747
Beginning balance (Scenario, Previously Reported) at Dec. 31, 2015		$ 774.4	$ 0.2	1,036.5	15.9	(246.5)	(31.7)
Beginning balance at Dec. 31, 2015		775.1
Stockholders' Equity [Roll Forward]
Net income		26.3			26.3
Other comprehensive income, net of tax		0.9					0.9
Issuance of common shares to employees upon vesting of restricted stock units and performance shares			51,373
Cancellation of employee non-vested shares			(172)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares			(35,162)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		$ (2.7)		(2.7)
Repurchase of common stock		(83,265)	(83,265)
Repurchase of common stock		$ (6.4)				(6.4)
Cash dividends on common stock ($0.45 per share)		(8.2)			(8.2)
Amortization of unearned equity compensation		2.6		2.6
Dividends on unvested equity awards that were canceled		$ 0.2			0.2
Ending balance, shares at Mar. 31, 2016		17,986,521	17,986,521
Ending balance at Mar. 31, 2016		$ 787.8	$ 0.2	$ 1,037.2	$ 34.1	$ (252.9)	$ (30.8)

[1] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

XML

Statement of Consolidated Stockholders' Equity Statement of Consolidated Stockholders' Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2016 $ / shares
Common Stock, Dividends, Per Share, Declared	$ 0.45
Retained Earnings
Common Stock, Dividends, Per Share, Declared	$ 0.45

XML

Statement of Consolidated Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income		$ 26.3	$ (292.2)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property, plant and equipment		8.3	7.6
Amortization of definite-lived intangible assets		0.4	0.4
Amortization of debt discount and debt issuance costs		0.3	3.2
Deferred income taxes – Note 4		15.1	(176.7)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest1	[1]	0.0	(1.0)
Non-cash equity compensation1	[2]	2.6	2.1
Inventory Write-down		4.9	0.0
Non-cash unrealized (gain) loss on derivative instruments		(4.0)	4.5
Non-cash defined benefit net periodic benefit cost relating to Salaried VEBA		0.8	0.6
Non-cash loss on removal of Union VEBA net assets2	[3]	0.0	446.7
Other non-cash changes in assets and liabilities		0.3	0.3
Changes in operating assets and liabilities:
Trade and other receivables		(24.6)	(18.3)
Inventories, excluding lower of cost or market write-down		4.1	(3.3)
Prepaid expenses and other current assets		(2.2)	(2.4)
Accounts payable		1.9	0.4
Accrued liabilities2		21.2	19.1
Annual variable cash contributions to VEBAs2	[3]	(19.5)	(13.7)
Long-term assets and liabilities, net2	[3]	(14.6)	30.1
Net cash provided by operating activities		21.3	7.4
Cash flows from investing activities3:
Capital expenditures		(25.9)	(11.3)
Proceeds from disposition of available for sale securities		20.0	84.0
Net cash (used in) provided by investing activities	[4]	(5.9)	72.7
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations		0.0	0.1
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest		0.0	1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(2.7)	(2.5)
Repurchase of common stock		(6.3)	(28.2)
Cash dividends paid to stockholders		(8.2)	(7.1)
Net cash used in financing activities	[4]	(17.2)	(36.9)
Net (decrease) increase in cash and cash equivalents during the period		(1.8)	43.2
Cash and cash equivalents at beginning of period		72.5	177.7
Cash and cash equivalents at end of period		$ 70.7	$ 220.9

[1] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09.

[2] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

[3] See Note 5 for the impact of removing the Union VEBA (defined in Note 5) net assets.

[4] See Note 12 for the supplemental disclosure on non-cash transactions.

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2016

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, 2015. Unless the context otherwise requires, references in these notes to interim consolidated financial statements - unaudited to "Kaiser Aluminum Corporation," "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 products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength, automotive, general engineering and other industrial end market applications. Our business is organized into one operating segment, Fabricated Products. See Note 11 for additional information regarding our reportable segment and business unit.

Principles of Consolidation and Basis of Presentation. The accompanying unaudited 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") applicable for interim periods and, therefore, do not include all information and footnotes required by GAAP for complete financial statements. In management's opinion, all adjustments (which include normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for our interim periods are not necessarily indicative of the results of operations that may be achieved for the entire 2016 fiscal year. The financial information as of December 31, 2015 is derived from our audited consolidated financial statements and footnotes for the year ended December 31, 2015 included in our Annual Report on Form 10-K. See New Accounting Pronouncements below for a discussion of new accounting pronouncements we adopted during the quarter ended March 31, 2016 requiring cumulative-effect adjustments that impacted our consolidated financial statements and footnotes for the year ended December 31, 2015.

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.

Inventories. Inventories are stated at the lower of cost or market value. On March 31, 2016, we recorded an inventory write-down of $4.9 million to reflect the net realizable value as of that date. The net realizable value reflected commitments as of that date from customers to purchase our inventory at prices that exceeded the Midwest Transaction Price ("Midwest Price"), which reflects the primary aluminum supply/demand dynamics in North America, reduced by an approximate normal profit margin. If we encounter a further decrease in our net realizable value of inventory, we may be subject to additional inventory lower of cost or market value adjustments.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At March 31, 2016, after adjusting for the inventory write down discussed above, the stated LIFO value of the inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $17.7 million. Additionally, during the quarter ended March 31, 2016, we decremented a prior year, higher cost LIFO layer, which resulted in an insignificant charge. The excess of current cost over the stated LIFO value of inventory at December 31, 2015 was $24.1 million. 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 our inventories at March 31, 2016 and December 31, 2015 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 $0.9 million and $0.3 million during the quarters ended March 31, 2016 and March 31, 2015, 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 and other items, but is included in Depreciation and amortization on the Statements of Consolidated Income (Loss). For the quarters ended March 31, 2016 and March 31, 2015, we recorded depreciation expense of $8.2 million and $7.5 million, respectively, relating to our operating facilities in the Fabricated Products segment. An immaterial amount of depreciation expense was also recorded within All Other for all periods presented in this Report.

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.

Foreign Currency Risk Management. From time to time, we enter into foreign currency forward contracts to protect the value of anticipated foreign currency expenses associated with cash commitments for equipment purchases. These derivative instruments are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. Both realized and unrealized periodic gains and losses of derivative instruments designated as cash flow hedges are deferred in Accumulated other comprehensive income until depreciation on the underlying equipment commences. Upon commencement, realized gains and losses are recorded in Net income (loss) as an adjustment to depreciation expense in the period in which depreciation is recognized on the underlying equipment. Depending on the time to maturity and asset or liability position, the carrying values of cash flow hedges are included in Prepaid expenses and other current assets, Other assets, Other accrued liabilities or Long-term liabilities. We report the effective portion of our cash flow hedges in the same financial statement line item as changes in the fair value of the hedged item.

In order to qualify for hedge accounting treatment, derivative instruments must be effective at reducing the risk associated with the exposure being hedged and must be designated as a hedge at the inception of the instrument contract. Hedge effectiveness is assessed periodically. Any derivative instrument not designated as a hedge, or so designated but ineffective, is adjusted to market value and recognized in net income immediately. If a cash flow hedge ceases to qualify for hedge accounting treatment, the derivative instrument would continue to be carried on the balance sheet at fair value until settled and future adjustments to the derivative instrument's fair value would be recognized in Net income (loss) immediately. If a forecasted equipment purchase was no longer probable to occur, amounts previously deferred in Accumulated other comprehensive income (loss) would be recognized immediately in Net income (loss). See Note 8 for additional information.

We are exposed to counterparty credit risk on all of our derivative instruments. Accordingly, we have established and maintained strict counterparty credit guidelines and entered into hedges only with major financial institutions that are investment grade or better. We do not have significant exposure to any one counterparty and management believes the risk of loss is remote and in any event would not be material. Additionally, we do not require collateral under these agreements.

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs("ASU 2015-03"), was issued in April 2015. ASU 2015-03 requires debt issuance costs related to a recognized debt liability to be presented in an entity's balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts, instead of being presented as a deferred charge in the balance sheet. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-03. During the quarter ended March 31, 2016, we retrospectively adopted ASU 2015-03, which resulted in a reclassification of $3.2 million of debt issuance costs related to our Senior Notes (as defined in Note 3) from Other assets to Long-term debt as of December 31, 2015.

ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements ("ASU 2015-15") was issued in August 2015 to address the presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-15. Our adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) ("ASU 2015-07"), was issued in May 2015. This ASU removes the requirement to categorize within the fair value hierarchy table investments without readily determinable fair values in entities that elect to measure fair value using net asset value per share ("NAV") or its equivalent. ASU 2015-07 requires that these investments continue to be shown in the fair value disclosure in order to allow the disclosure to reconcile to the investment amount presented in the balance sheet. Our retrospective adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), was issued in August 2015. ASU 2015-14 defers the effective date of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was issued in May 2014 and requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, by one year for all entities and permits early adoption on a limited basis. We expect to adopt ASU 2014-09 for the fiscal year ending December 31, 2018 and will continue to assess the impact of the adoption on our consolidated financial statements; however, based on our assessments to date, we do not expect the adoption of this ASU to have a material impact on our consolidated financial statements.

ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes ("ASU 2015-17"), was issued in November 2015. ASU 2015-17 requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. This ASU does not, however, change the existing requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount. During the quarter ended March 31, 2016, we early adopted this ASU on a prospective basis. As such, prior periods were not retrospectively adjusted.

ASU No. 2016-02, Leases (Topic 842): Amendments to the Financial Accounting Standards Board Accounting Standards Codification ("ASU 2016-02"), was issued in February 2016. Under ASU 2016-02, lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). For income statement purposes, a dual model was retained, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). ASU 2016-02 becomes effective for us in the first quarter of 2019. We are currently evaluating whether to early adopt the standard and what impact it will have on our consolidated financial statements, which we expect will be material.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), was issued in March 2016. ASU 2016-09 eliminates additional paid in capital ("APIC") pools and requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. The accounting for an employee's use of shares to satisfy the employer's statutory income tax withholding obligation and the accounting for forfeitures is also changing. ASU 2016-09 becomes effective for us in the first quarter of 2017. We early adopted ASU 2016-09 during the quarter ended March 31, 2016. See Note 4 and Note 6 for a discussion on the impact of our adoption of ASU 2016-09.

XML

Supplemental Balance Sheet Information

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Information

Supplemental Balance Sheet Information

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	34.5		$	40.3
Commercial paper	36.2			32.2
Total	$	70.7		$	72.5
Trade Receivables – Net
Billed trade receivables	$	139.4		$	116.8
Unbilled trade receivables	0.2			0.7
Trade receivables, gross	139.6			117.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables – net	$	138.8		$	116.7
Inventories
Finished products	$	66.8		$	79.5
Work-in-process	73.4			63.6

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Raw materials	46.7			53.4
Operating supplies and repair and maintenance parts	23.7			23.1
Total	$	210.6		$	219.6
Prepaid Expenses and Other Current Assets
Current derivative assets – Notes 8 and 9	$	1.4		$	1.5
Current deferred tax assets1	—			49.6
Prepaid taxes	3.3			—
Prepaid insurance	1.1			1.9
Short-term restricted cash	0.3			0.3
Other	3.0			3.4
Total	$	9.1		$	56.7
Property, Plant and Equipment – Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	72.5			71.8
Machinery and equipment	559.3			549.0
Construction in progress	54.8			48.5
Property, plant and equipment – gross	709.3			692.0
Accumulated depreciation	(205.1		)	(196.9		)
Assets held for sale	0.3			0.3
Property, plant and equipment – net	$	504.5		$	495.4
Other Assets
Restricted cash	$	10.9		$	10.9
Deferred financing costs on Revolving Credit Facility	1.1			1.3
Deferred compensation plan assets	7.3			7.3
Derivative assets – Notes 8 and 9	0.2			0.1
Total	$	19.5		$	19.6
Other Accrued Liabilities
Current derivative liabilities – Notes 8 and 9	$	10.3		$	14.1
Uncleared cash disbursements	10.0			8.0
Accrued income taxes and taxes payable	8.6			3.1
Accrued annual contribution to VEBAs	—			19.6
Accrued contingent contribution to Union VEBA – Note 5	17.1			—
Short-term environmental accrual – Note 7	1.3			1.6
Accrued interest	5.5			1.5
Short-term deferred revenue	0.8			1.2
Other	2.9			3.6
Total	$	56.5		$	52.7

	March 31, 2016		December 31, 2015
	(In millions of dollars)
Long-Term Liabilities
Derivative liabilities – Notes 8 and 9	$	1.7	$	2.1
Income tax liabilities	0.8		0.7
Workers' compensation accruals	24.1		21.7
Long-term environmental accrual – Note 7	16.8		17.0
Long-term asset retirement obligations	4.9		4.8
Deferred compensation liability	7.8		7.7
Long-term deferred revenue	0.3		0.3
Long-term capital leases	0.1		0.1
Long-term portion of contingent contribution to Union VEBA – Note 5	12.8		29.9
Other long-term liabilities	3.2		3.2
Total	$	72.5	$	87.5

____________

¹  See Note 4 for discussion of our adoption of ASU 2015-17.

XML

Debt and Credit Facility

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Debt and Credit Facility

Debt and Credit Facility

Senior Notes

In May 2012, we issued $225.0 million principal amount of 8.25% unsecured senior notes due June 1, 2020 ("Senior Notes") at 100% of the principal amount. During 2015, we repurchased $27.2 million aggregate principal amount of our Senior Notes for 107.5% of the face value. As of both March 31, 2016 and December 31, 2015, $197.8 million aggregate principal amount of our Senior Notes remained outstanding. Interest expense, including amortization of deferred financing costs, relating to the Senior Notes was $4.3 million and $4.8 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. A portion of the interest relating to the Senior Notes was capitalized as construction in progress. We may redeem the Senior Notes at our option in whole or part at any time on or after June 1, 2016 at a redemption price of 104.125% of the principal amount, declining to 102.0625% of the principal amount on or after June 1, 2017 and declining further to 100% of the principal amount on or after June 1, 2018, in each case plus any accrued and unpaid interest.

The fair value of the outstanding Senior Notes at March 31, 2016 and December 31, 2015 was approximately $205.7 million and $207.3 million, respectively. See Note 9 for information relating to the estimated fair value of the Senior Notes.

Revolving Credit Facility

Our credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the other financial institutions party thereto ("Revolving Credit Facility") provides us with a $300.0 million funding commitment through December 2020. We had $299.1 million of borrowing availability under the Revolving Credit Facility at March 31, 2016, based on the borrowing base determination then in effect. At March 31, 2016, there were no borrowings under the Revolving Credit Facility and $7.3 million was being used to support outstanding letters of credit, leaving $291.8 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 3.75% at March 31, 2016.

XML

Income Tax Matters

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Income Tax Matters

Income Tax Matters

The provision for (benefit from) incomes taxes for each period presented consisted of the following (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Domestic	$	14.9	$	(175.8	)
Foreign	0.2		—
Total	$	15.1	$	(175.8	)

The income tax provision (benefit) for the quarters ended March 31, 2016 and March 31, 2015 was $15.1 million and $(175.8) million, reflecting an effective tax rate of 36.5% and 37.6%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2016 was due to (i) a decrease of $0.7 million for the recognition of excess tax benefits from stock compensation, resulting in a 1.7% decrease to the blended statutory tax rate, which was partially offset by (ii) an increase of $0.3 million to the valuation allowance for certain state net operating losses, resulting in a 0.7% increase to the blended statutory tax rate. There was no material difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2015.

The $175.8 million income tax benefit for the quarter ended March 31, 2015 included a $184.4 million tax benefit that was recorded as a result of removing the Union VEBA net assets and related deferred tax liabilities from our consolidated financial statements. See Note 5 for disclosure regarding employee benefits.

Our gross unrecognized benefits relating to uncertain tax positions were $1.7 million at March 31, 2016 and December 31, 2015, respectively, of which, $0.6 million would be recorded through our income tax provision and thus impact the effective tax rate at March 31, 2016 and December 31, 2015, respectively, if the gross unrecognized tax benefits were to be recognized.

We do not expect our gross unrecognized tax benefits to significantly change within the next 12 months.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, was issued and early adopted in March 2016. ASU 2016-09 eliminates additional paid in capital ("APIC") pools and requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. In addition, modified retrospective adoption of ASC 2016-09 eliminates the requirement that excess tax benefits be realized (i.e., through a reduction in income taxes payable) before we can recognize them and therefore, we have recorded a cumulative-effect adjustment of $0.7 million through Retained earnings and Deferred tax assets – net during the quarter ended March 31, 2016 to record excess tax benefits not previously recognized.

XML

Employee Benefits

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

Employee Benefits

Pension and Similar Benefit Plans. We provide contributions to: (i) multi-employer pension plans sponsored by the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union AFL-CIO, CLC ("USW") and the International Association of Machinists and certain other unions at certain of our production facilities; (ii) defined contribution 401(k) savings plans for hourly bargaining unit employees and salaried and certain hourly non-bargaining unit employees; (iii) a defined benefit plan for salaried employees at our London, Ontario (Canada) facility; and (iv) a non-qualified, unfunded, unsecured plan of deferred compensation for key employees who would otherwise suffer a loss of benefits under our defined contribution plan.

VEBA Postretirement Obligations. Certain eligible retirees participate in a voluntary employees' beneficiary association ("VEBA") that provides healthcare and medical cost reimbursement benefits for eligible retirees represented by certain unions and their surviving spouse and eligible dependents (the "Union VEBA") or a VEBA that provides healthcare related benefits for certain other eligible retirees and their surviving spouse and eligible dependents (the "Salaried VEBA" and, together with the Union VEBA, "VEBAs"). The Union VEBA covers certain qualifying bargaining unit retirees and future retirees. The Salaried VEBA covers certain retirees who retired prior to the 2004 termination of the prior plan and employees who were hired prior to February 2002 and have subsequently retired or will retire with the requisite age and service.

Our primary financial obligation to the VEBAs is to make an annual variable cash contribution based on the contribution formula discussed in Note 6 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2015. The variable cash contribution obligation to the Union VEBA expires in September 2017, while the obligation to the Salaried VEBA has no express termination date. The variable contribution for 2015 was $19.5 million (comprised of $16.7 million to the Union VEBA and $2.8 million to the Salaried VEBA). These amounts were paid during the first quarter of 2016. We treat the Salaried VEBA as a defined benefit plan in our financial statements.

In the quarter ended March 31, 2015, after determining that our obligation to make annual variable contributions to the Union VEBA would expire as of September 2017, we terminated defined benefit plan accounting for the Union VEBA. This resulted in a non-cash loss of $307.8 million, net of a $184.4 million tax benefit, as we removed the Union VEBA net assets and related deferred tax liabilities from our Consolidated Balance Sheet. We have recorded the estimated liability for the remaining variable cash contributions in Other accrued liabilities and Long-term liabilities (see Note 2). Our aggregate estimate of $29.9 million for the amounts due for the 2016 variable cash contribution (to be paid in 2017) and the variable contribution for the first nine months of 2017 (to be paid in 2018) is subject to change based on our actual cash flow for each respective calendar year. We review the estimated liability quarterly and reflect any changes in our Operating income (loss).

Components of Net Periodic Benefit Cost. Our results of operations included the following impacts associated with the Canadian defined benefit plan and the Salaried VEBA: (a) charges for service rendered by employees; (b) a charge for accretion of interest; (c) a benefit for the return on plan assets; and (d) amortization of net gains or losses on assets, prior service costs associated with plan amendments and actuarial differences. Net periodic benefit cost related to the Canadian defined benefit plan was not material for the quarters ended March 31, 2016 and March 31, 2015. The following table presents the components of net periodic benefit cost for the Salaried VEBA and charges relating to all other employee benefit plans for the periods presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Salaried VEBA:
Service cost1	$	—		$	—
Interest cost	0.7			0.7
Expected return on plan assets	(1.0		)	(1.1		)
Amortization of prior service cost	1.0			0.7
Amortization of net actuarial loss	0.1			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	0.8			0.6
(Gain) loss on removal of Union VEBA net assets	(0.1		)	492.2
Other employee benefit plans:
Deferred compensation plan	0.1			0.4
Defined contribution plans	4.0			4.0
Multiemployer pension plans	1.1			0.9
Total other employee benefit plans	$	5.2		$	5.3
Total	$	5.9		$	498.1

____________

¹  The service cost was insignificant for all periods presented.

The following table presents the allocation of the charges (income) detailed above, by reportable segment and business unit (in millions of dollars – see Note 11):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	4.7	$	4.6
All Other	1.2		493.5
Total	$	5.9	$	498.1

For all periods presented, Net periodic postretirement benefit cost relating to the Salaried VEBA and the (Gain) loss on removal of Union VEBA net assets were included within All Other. Further, substantially all of the Fabricated Products segment's employee benefits related charges are in Cost of products sold, excluding depreciation and amortization and other items with the remaining balance in Selling, general, administrative, research and development ("SG&A and R&D").

XML

Employee Incentive Plans

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee Incentive Plans

Employee Incentive Plans

Short-Term Incentive Plans ("STI Plans")

We have annual short-term incentive compensation plans for senior management and certain other employees payable at our election in cash, shares of common stock, or a combination of cash and shares of common stock. Amounts earned under STI Plans are based on our adjusted earnings before interest, taxes, depreciation and amortization ("Adjusted EBITDA"), modified for certain safety, quality, delivery, cost and individual performance factors. The Adjusted EBITDA targets are determined based on the economic value added ("EVA") of our Fabricated Products business. Most of our production facilities have similar programs for both hourly and salaried employees. As of March 31, 2016, we had a liability of $4.9 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the first quarter performance period of our 2016 STI Plans.

Long-Term Incentive Programs ("LTI Programs")

General. Executive officers and other key employees of the Company, as well as non-employee directors of the Company, are eligible to participate in the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan (as amended, "Equity Incentive Plan"). Subject to certain adjustments that may be required from time to time to prevent dilution or enlargement of the rights of participants under the Equity Incentive Plan, a total of 2,722,222 common shares have been authorized for issuance under the Equity Incentive Plan. At March 31, 2016, 603,810 common shares were available for additional awards under the Equity Incentive Plan.

Non-vested Common Shares and Restricted Stock Units. We grant non-vested common shares and restricted stock units to our non-employee directors, executive officers and other key employees. The restricted stock units have rights similar to the rights of non-vested common shares and each restricted stock unit that becomes vested entitles the recipient to receive one common share. For both non-vested common shares and restricted stock units, the service period is generally one year for non-employee directors and three years for executive officers and other key employees.

In addition to non-vested common shares and restricted stock units, we grant performance shares to executive officers and other key employees. Each performance share that becomes vested entitles the recipient to receive one common share. Performance shares granted in 2014 and 2015 ("TSR-Based Performance Shares") are subject to performance conditions pertaining to our total shareholder return ("TSR") over a three-year performance period compared to the TSR of a specified group of peer companies. The number of TSR-Based Performance Shares that will ultimately vest under both the 2014-2016 and 2015-2017 LTI Plans and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares (constituting approximately one-half of the maximum payout) and depends on the percentile ranking of our TSR compared to the group of peer companies. Performance shares granted in 2016 consist of TSR-Based Performance Shares and performance shares subject to performance requirements ("CP-Based Performance Shares") pertaining to our cost performance as set forth in the 2016 LTI Program. The number of CP-Based Performance Shares that will ultimately vest and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares (constituting approximately one-half of the maximum payout) and depends on the average annual cost performance achieved for the specified three-year performance period.

During the first quarter of 2016, performance shares granted in 2013 ("EVA-Based Performance Shares") under the 2013-2015 LTI Program became fully vested (see "Summary of Activity" below). The EVA-Based Performance Shares were subject to performance conditions pertaining to our EVA performance, measured over the three-year performance period. The number of EVA-Based Performance Shares that vested and resulted in the issuance of common shares was dependent on the average annual EVA achieved for the specified three-year performance period.

The vesting of performance shares resulting in the issuance and delivery of common shares, if any, under the 2014-2016 and 2015-2017 LTI Programs will occur in 2017 and 2018, respectively.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, was issued and early adopted in March 2016. ASU 2016-09 eliminates the requirement to estimate and apply a forfeiture rate to reduce stock compensation expense during the vesting period and, instead, account for forfeitures as they occur. ASU 2016-09 requires that this change be adopted using the modified retrospective approach. As such, we recorded a cumulative-effect adjustment of $0.8 million during the quarter ended March 31, 2016 to reduce our December 31, 2015 Retained earnings and increase our December 31, 2015 Additional paid in capital balances. Additionally, ASU 2016-09 addresses the presentation of excess tax benefits and employee taxes paid on the statement of cash flows. We are now required to present excess tax benefits as an operating activity (combined with other income tax cash flows) on the statement of cash flows rather than as a financing activity, and we have adopted this change prospectively. ASU 2016-09 also requires the presentation of employee taxes as a financing activity on the statement of cash flows, which is where we had previously classified these items. This change, therefore, did not impact our financial statements.

Non-Cash Compensation Expense. Compensation expense relating to all awards under the Equity Incentive Plan is included in SG&A and R&D. Non-cash compensation expense by type of award under LTI Programs was as follows for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares and restricted stock units	$	1.1	$	1.1
EVA-Based Performance Shares	0.3		0.4
TSR-Based Performance Shares	1.1		0.6
CP-Based Performance Shares	$	0.1	$	—
Total non-cash compensation expense	$	2.6	$	2.1

The following table presents the allocation of the charges detailed above, by segment (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	0.8	$	0.7
All Other	1.8		1.4
Total non-cash compensation expense	$	2.6	$	2.1

Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of March 31, 2016:

	Unrecognized gross compensation costs (in millions of dollars)		Expected period (in years) over which the remaining gross compensation costs will be recognized
Non-vested common shares and restricted stock units	$	8.3	2.3
CP-Based Performance Shares	$	4.7	2.9
TSR-Based Performance Shares	$	10.5	2.2

Summary of Activity. A summary of the activity with respect to non-vested common shares, restricted stock units, EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares for the quarter ended March 31, 2016 is as follows:

	Non-Vested Common Shares				Restricted Stock Units				EVA-Based Performance Shares				CP-Based Performance Shares				TSR-Based Performance Shares
	Shares		Weighted-Average Grant-Date Fair Value per Share		Units		Weighted-Average Grant-Date Fair Value per Unit		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2015	156,553		$	67.20	5,521		$	66.64	155,105		$	57.76	—		$	—	299,877		$	89.43
Granted1	—		—		52,705		74.49		—		—		63,983		80.46		95,974		93.02
Vested	(38,812	)	60.75		(1,762	)	63.18		(49,611	)	57.76		—		—		—		—
Forfeited1	(172	)	68.99		(165	)	74.49		—		—		(164	)	80.46		(1,115	)	90.06
Canceled1	—		—		—		—		(105,494	)	57.76		—		—		—		—
Outstanding at March 31, 2016	117,569		$	69.33	56,299		$	74.07	—		$	—	63,819		$	80.46	394,736		$	90.30

____________

¹  For EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares, the number of shares granted and forfeited are presented at their maximum payout; and the number of shares canceled includes the number of shares that did not vest due to EVA performance results falling below those required for maximum payout.

The weighted-average grant-date fair value per share for shares granted by type of award was as follows for each period presented:

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares	$	—	$	69.83
Restricted stock units	$	74.49	$	69.83
CP-Based Performance Shares	$	80.46	$	—
TSR-Based Performance Shares	$	93.02	$	95.68

Stock Options. We had 16,645 fully-vested stock options outstanding as of March 31, 2016 and December 31, 2015, in each case exercisable to purchase common shares at $80.01 per share and having a remaining contractual life of 1.00 and 1.25 years, respectively. During the quarter ended March 31, 2016, no options were granted, exercised or forfeited.

Vested Stock. From time to time, we issue common shares to non-employee directors electing to receive common shares in lieu of all or a portion of their annual retainer fees. The fair value of these common shares is based on the fair value of the shares at the date of issuance and is immediately recognized in Net income (loss) as a period expense. Such shares are generally issued during the second quarter of each fiscal year.

Under the Equity Incentive Plan, participants may elect to have us withhold common shares to satisfy minimum statutory tax withholding obligations arising in connection with the exercise of stock options and vesting of non-vested shares, restricted stock units and performance shares. We cancel any such shares withheld on the applicable vesting dates or earlier dates when service requirements are satisfied, which correspond to the times at which income to the employee is recognized. When we withhold these common shares, we are required to remit to the appropriate taxing authorities the fair value of the shares withheld as of the vesting date. During the quarters ended March 31, 2016 and March 31, 2015, 35,162 and 33,628 common shares, respectively, were withheld and canceled for this purpose. The withholding of common shares by us could be deemed a purchase of the common shares.

XML

Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Commitments. We have a variety of financial commitments, including purchase agreements, forward foreign exchange and forward sales contracts, indebtedness and letters of credit (see Note 3 and Note 8).

There were no material changes to our scheduled minimum rental commitments and purchase obligations during the quarter ended March 31, 2016.

Environmental Contingencies. We are subject to a number of environmental laws and regulations, to potential fines or penalties assessed for alleged breaches of such laws and regulations and to potential claims based upon such laws and regulations.

We have established procedures for regularly evaluating environmental loss contingencies. Our environmental accruals represent our undiscounted estimate of costs reasonably expected to be incurred based on presently enacted laws and regulations, existing requirements, currently available facts, existing technology and our assessment of the likely remediation actions to be taken.

In 2012, we submitted a final feasibility study to the Washington State Department of Ecology ("Washington State Ecology") that included recommendations for remediation alternatives primarily to address the historical use of oils containing polychlorinated biphenyls ("PCBs") at our Spokane, Washington (“Trentwood”) facility. We also signed an amended work order in 2012 with Washington State Ecology allowing certain remediation activities to begin, including the initiation of a treatability study in regards to proposed PCB remediation methods. We began implementation of certain approved sections of the work plan in 2013 and throughout 2014, completing a number of these sections in 2014 and receiving approval from Washington State Ecology. Also in cooperation with Washington State Ecology, we began construction of a pilot test facility to implement the treatability study and evaluate the feasibility of removing PCBs from ground water under the Trentwood facility. As pilot testing has only begun and the success of the new methodology cannot be reasonably determined at this time, it is possible that we may need to make upward adjustments to our related accruals as facts and cost estimates regarding the groundwater treatment method become available. 

During 2013, at the request of the Ohio Environmental Protection Agency ("OEPA"), we initiated an investigational study of the Newark, Ohio (“Newark”) facility related to historical on-site waste disposal. Since 2014, we completed a number of preliminary steps in the preparation of completing the final risk assessment and feasibility study, both of which are subject to review and approval by the OEPA. As work continues and progresses to a final risk assessment and feasibility study, we will establish and update estimates for probable and estimable remediation, if any. The actual and final cost for remediation will not be fully determinable until a final feasibility study is submitted and accepted by the OEPA and work plans are prepared, which is expected to occur in the next nine to 15 months.

At March 31, 2016, our environmental accrual of $18.1 million represented our estimate of the incremental remediation cost based on: (i) proposed alternatives in the final feasibility study related to the Trentwood facility; (ii) currently available facts with respect to our Newark facility; and (iii) facts related to certain other locations owned or formerly owned by us. In accordance with approved and proposed remediation action plans, we expect that the implementation and ongoing monitoring could occur over a period of 30 or more years.

As additional facts are developed, feasibility studies are completed, draft remediation plans are modified, necessary regulatory approvals for the implementation of remediation are obtained, alternative technologies are developed, and/or other factors change, there may be revisions to management's estimates and actual costs may exceed the current environmental accruals. We believe at this time that it is reasonably possible that undiscounted costs associated with these environmental matters may exceed current accruals by amounts that could be, in the aggregate, up to an estimated $24.7 million over the remediation period. It is reasonably possible that our recorded estimate will change in the next 12 months.

Other Contingencies. We are party to various lawsuits, claims, investigations and administrative proceedings that arise in connection with past and current operations. We evaluate such matters on a case-by-case basis, and our policy is to vigorously contest any such claims we believe are without merit. We accrue for a legal liability when it is both probable that a liability has been incurred and the amount of the loss is material and reasonably estimable. Quarterly, in addition to when changes in facts and circumstances require it, we review and adjust these accruals to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular case. While uncertainties are inherent in the final outcome of such matters and it is presently impossible to determine the actual cost that may ultimately be incurred, we believe that we have sufficiently accrued for such matters and that the ultimate resolution of pending matters will not have a material impact on our consolidated financial position, operating results, or liquidity.

XML

Derivative Financial Instruments and Related Hedging Programs

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Related Hedging Programs

Derivative Financial Instruments and Related Hedging Programs

Overview. In conducting our business, we enter into derivative transactions, including forward contracts and options, to limit our economic (i.e. cash) exposure resulting from: (i) metal price risk related to our sale of fabricated aluminum products and the purchase of metal used as raw material for our fabrication operations; (ii) energy price risk relating to fluctuating prices of natural gas and electricity used in our production processes; and (iii) foreign currency requirements with respect to our foreign subsidiaries and cash commitments for equipment purchases denominated in foreign currency.

Our derivative activities are overseen by a hedging committee ("Hedging Committee"), which is composed of our chief executive officer, chief operating officer, chief financial officer, chief accounting officer, treasurer and vice president of commodity risk management and other officers and employees selected by the chief executive officer.The Hedging Committee meets regularly to review derivative positions and strategy and reports to our Board of Directors on the scope of its activities.

Hedges of Operational Risks

Designated Foreign Currency Cash Flow Hedges. We are exposed to foreign currency exchange risk related to firm-price agreements for equipment purchases from foreign manufacturers. Such agreements require that we make payments in foreign currency to the vendor over time based on milestone achievements. We use foreign currency forward contracts in order to mitigate the exposure to currency exchange rate fluctuations related to these purchases. The timing and amounts of the forward contract settlements are designed to line up with the timing and amounts of scheduled payments to the foreign equipment manufacturers and are therefore expected to be highly effective hedges. As of March 31, 2016, we had open forward contracts designated as cash flow hedges to purchase euros with maturity dates between two months and 17 months. The notional amounts of these foreign currency forward contracts totaled 4.0 million euros and 4.7 million euros at March 31, 2016 and December 31, 2015, respectively, with an average contract exchange rate of 1.14 euro to US dollar for both periods. The effective portion of the fair value on these instruments is recorded within Other comprehensive income (loss) and is reclassified into the Statements of Consolidated Income (Loss) on the same line item and the same period in which the underlying equipment is depreciated. We had no such reclassifications into Net income (loss) during the quarter ended March 31, 2016 and anticipate no material such reclassifications for the next 12 months. For the quarter ended March 31, 2016, we recorded an unrealized gain of $0.2 million on the effective portions of our designated foreign currency cash flow hedges, resulting in an ending loss in Accumulated other comprehensive loss related to the cash flow hedges of $0.1 million at March 31, 2016. We incurred no ineffectiveness on these hedges during the quarter ended March 31, 2016. There were no forward contracts designated as cash flow hedges during the quarter ended March 31, 2015.

Non-Designated Hedges of Operational Risks. Our pricing of fabricated aluminum products is generally intended to lock in a conversion margin (representing the value added from the fabrication process(es)) and to pass through metal price fluctuations to our customers. For some of our higher value added products sold on a spot basis, the pass through of metal price movements can sometimes lag by as much as several months, with a favorable impact to us when metal prices decline and an adverse impact to us when metal prices increase. Additionally, in certain instances, we enter into firm-price arrangements with our customers for stipulated volumes to be delivered in the future. Because we generally purchase primary and secondary aluminum on a floating price basis, the lag in passing through metal price movements to customers on some of our higher value added products sold on a spot basis and the volume that we have committed to sell to our customers under a firm-price arrangement create metal price risk for us. We use third-party hedging instruments to limit exposure to metal price risk related to the metal pass through lag on some of our products and firm-price customer sales contracts. See Note 9 for additional information regarding our material derivative positions relating to hedges of operational risk, and their respective fair values.

A majority of our derivative contracts relating to hedges of operational risks contain liquidity based thresholds that could require us to provide additional collateral in the event our liquidity were to fall below specified levels. To minimize the exposure to additional collateral requirements related to our liability hedge positions, we allocate hedging transactions among our counterparties, use options as part of our hedging activities, or both. The aggregate fair value of our derivative instruments that were in a net liability position was $10.4 million and $14.6 million at March 31, 2016 and December 31, 2015, respectively, and we had no collateral posted as of those dates.

We regularly review the creditworthiness of our derivative counterparties and do not expect to incur significant loss from the failure of any counterparties to perform under any agreements.

Realized and Unrealized Gains and Losses. Realized and unrealized (losses) gains associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Included in Other Comprehensive Income (Loss):
Unrealized gain:
Foreign Currency	$	0.2		$	—
Included in Statements of Consolidated Income (Loss):
Realized loss1:
Aluminum	(2.7		)	(2.7		)
Natural Gas	(1.7		)	(1.3		)
Electricity	—			(0.7		)
Total realized loss	$	(4.4	)	$	(4.7	)
Unrealized gain (loss)2:
Non-designated hedges of operational risk:
Aluminum	$	3.2		$	(4.2	)
Natural Gas	0.8			(0.7		)
Electricity	—			0.4
Total non-designated hedges of operational risk	4.0			(4.5		)
Option Assets relating to the Convertible Notes3	—			10.2
Bifurcated Conversion Feature of the Convertible Notes3	—			(10.2		)
Total unrealized gain (loss)	$	4.0		$	(4.5	)

______________________

¹  Realized loss on hedges of operational risk are recorded within Cost of products sold, excluding depreciation, amortization and other items.

²  Unrealized gain (loss) on hedges of operational risk are recorded within Unrealized (gain) loss on derivative instruments.

³  Unrealized gain (loss) on financial derivatives related to our 4.5% unsecured cash convertible senior notes ("Convertible Notes"), which settled in April 2015.

The following table summarizes our material derivative positions at March 31, 2016:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Call option purchase contracts	4/16 through 6/16	2.0
Fixed price purchase contracts	4/16 through 12/17	128.4
Fixed price sales contracts	4/16 through 12/17	2.2
Midwest premium swap contracts1	4/16 through 12/17	92.0

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	4/16 through 12/18	7,070,000

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	5/16 through 8/17	3,950,374

______________________

¹  Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on our purchases of primary aluminum.

²  As of March 31, 2016, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 79%, 73% and 72% of the expected natural gas purchases for the remainder of 2016, 2017 and 2018 respectively.

We have physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for the remainder of 2016 and 2017, and 27% for 2018.

We enter into derivative contracts with counterparties, some of which are subject to enforceable master netting arrangements and some of which are not. We reflect the fair value of our derivative contracts on a gross basis on the Consolidated Balance Sheets (see Note 2).

The following tables present offsetting information regarding our derivatives by type of counterparty as of March 31, 2016 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.0	$	—	$	1.0	$	1.0	$	—	$	—
Counterparty (with partial netting agreements)	0.6		—		0.6		0.6		$	—	$	—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(6.3	)	$	—	$	(6.3	)	$	(1.0	)	$	—	$	(5.3	)
Counterparty (with partial netting agreements)	(5.7		)	—		(5.7		)	(0.6		)	—		(5.1		)
Total	$	(12.0	)	$	—	$	(12.0	)	$	(1.6	)	$	—	$	(10.4	)

The following tables present offsetting information regarding our derivatives by type of counterparty as of December 31, 2015 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.3	$	—	$	1.3	$	1.3	$	—	$	—
Counterparty (with partial netting agreements)	0.3		—		0.3		0.3		—		—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(8.5	)	$	—	$	(8.5	)	$	(1.3	)	$	—	$	(7.2	)
Counterparty (with partial netting agreements)	(7.7		)	—		(7.7		)	(0.3		)	—		(7.4		)
Total	$	(16.2	)	$	—	$	(16.2	)	$	(1.6	)	$	—	$	(14.6	)

XML

Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurement

Fair Value Measurements

Overview

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.

The fair values of financial assets and liabilities are evaluated and measured on a recurring basis. As part of that evaluation process, we 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. We historically have not had significant transfers into or out of each hierarchy level.

Financial assets and liabilities that we measure at fair value as required by GAAP include: (i) our derivative instruments; (ii) the plan assets of the Salaried VEBA and our Canadian defined benefit pension plan measured annually at December 31; and (iii) available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 5). We record certain other financial assets and liabilities at carrying value (see the tables below for the fair value disclosure of those assets and liabilities).

The majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur (or at least annually for goodwill), an evaluation of the affected non-financial asset or liability is required, potentially resulting in an adjustment to the carrying amount of such asset or liability.

Fair Values of Financial Assets and Liabilities

Derivative Assets and Liabilities. Our derivative contracts are valued at fair value using significant observable and unobservable inputs.

Commodity, Energy and Foreign Currency Derivatives - The fair values of a majority of these derivative contracts are based upon trades in liquid markets. Valuation model inputs can generally be verified, and valuation techniques do not involve significant judgment. The fair values of such financial instruments are generally classified within Level 2 of the fair value hierarchy. We, however, have some derivative contracts that do not have observable market quotes. For these financial instruments, management uses significant unobservable inputs (e.g., information concerning regional premiums for swaps). Where appropriate, valuations are adjusted for various factors, such as bid/offer spreads. The fair values of these financial instruments are classified as Level 3 in the fair value hierarchy.

Salaried VEBA and Canadian Pension Plan Assets. The plan assets of the Salaried VEBA and our Canadian pension plan are measured annually on December 31 and reflected in our Consolidated Balance Sheets at fair value. 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.

Available for Sale Securities. We hold debt investment securities that are accounted for as available for sale securities. The fair value of the debt investment securities, which consist of commercial paper and corporate bonds, is determined based on valuation models that use observable market data. At March 31, 2016, all of our short-term investments had maturity dates within two months. We review our debt investment portfolio for other-than-temporary impairment at least quarterly or when there are changes in credit risk or other potential valuation concerns. At March 31, 2016 and March 31, 2015, the total unrealized loss, net of tax, included in accumulated other comprehensive loss was immaterial and was not other-than-temporarily impaired. We believe that it is probable that the principal and interest will be collected in accordance with the contractual terms, and that the unrealized loss on these securities were due to changes in normal market fluctuations, and were not due to increased credit risk or other valuation concerns. In addition to debt investment securities, we also hold assets in various investment funds at certain registered investment companies in connection with our deferred compensation program (see Note 5). Such assets are accounted for as available for sale securities and are measured and recorded at fair value based on the NAV of the investment funds on a recurring basis. The fair value input of the available for sale securities is considered either a Level 1 or Level 2 input depending on whether the debt security or investment fund is traded on a public exchange. The amortized cost for available for sale securities approximates their fair value.

All Other Financial Assets and Liabilities. We believe that the fair value of our cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their respective carrying values due to their short maturities and nominal credit risk.

The fair value of the Senior Notes at March 31, 2016 and December 31, 2015 was based on the Senior Notes' trading price and is considered a Level 1 input in the fair value hierarchy (see Note 3 for the carrying values).

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	March 31, 2016
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.8			—			0.8
Midwest premium swap contracts	—			—			0.5			0.5
Natural Gas -
Fixed priced purchase contracts	—			0.1			—			0.1
All Other Financial Assets:
Cash and cash equivalents	34.5			36.2			—			70.7
Short-term investments	—			10.0			—			10.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	34.5		$	54.6		$	0.5		$	89.6
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(5.6	)	$	—		$	(5.6	)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas –Fixed price purchase contracts	—			(6.1		)	—			(6.1		)
All Other Financial Liabilities:
Senior Notes	(205.7		)	—			—			(205.7		)
Total liabilities	$	(205.7	)	$	(11.7	)	$	(0.3	)	$	(217.7	)

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	December 31, 2015
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.3			—			0.3
Fixed price sales contracts	—			0.2			—			0.2
Midwest premium swap contracts	—			—			0.9			0.9
All Other Financial Assets:
Cash and cash equivalents	40.3			32.2			—			72.5
Short-term investments	—			30.0			—			30.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	40.3		$	70.2		$	0.9		$	111.4
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(8.9	)	$	—		$	(8.9	)
Fixed price sales contracts	—			(0.1		)	—			(0.1		)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas – Fixed price purchase contracts	—			(6.7		)	—			(6.7		)
Derivative Instruments (Designated Hedges):
Foreign Currency – Euro forward purchase contracts	—			(0.2		)	—			(0.2		)
All Other Financial Liabilities:
Senior Notes	(207.3		)	—			—			(207.3		)
Total liabilities	$	(207.3	)	$	(15.9	)	$	(0.3	)	$	(223.5	)

Financial instruments classified as Level 3 in the fair value hierarchy represent Midwest premium swap contracts for which at least one significant unobservable input in the valuation model is a management estimate. This is necessary due to the lack of an exchange traded product with observable market pricing data. Fair value was determined using a forward curve based on the average pricing quotes from our trading counterparties and applying a discount factor based on the risk-free interest rate.

The following table presents quantitative information for Level 3 Midwest premium derivative contracts:

	Fair Value at March 31, 2016 (in millions of dollars)			Valuation technique	Unobservable input	Settlement Period	Range ($ in unit price)
Assets:
Midwest premium contracts	$	0.5		Discounted fair value	Forward price curve	Apr-16 through Dec-17	$0.083 per metric ton to $0.084 per metric ton
Liabilities:
Midwest premium contracts	$	(0.3	)	Discounted fair value	Forward price curve	Apr-16 through Jun-17	$0.083 per metric ton to $0.084 per metric ton

The following table presents a reconciliation of activity for the Midwest premium derivative contracts on a net basis (in millions of dollars):

	Level 3
Fair value measurement at December 31, 2015	$	0.6
Total realized/unrealized (loss) included in:
Cost of goods sold excluding depreciation and amortization and other items and Unrealized loss on derivative instruments	—
Transactions involving Level 3 derivative contracts:
Purchases	(0.1		)
Sales	—
Issuances	—
Settlements	(0.3		)
Transactions involving Level 3 derivatives – net	(0.4		)
Transfers in and/or out of Level 3 valuation hierarchy	—
Fair value measurement at March 31, 2016	$	0.2
Total gain included in Unrealized (gain) loss on derivative instruments, attributable to the change in unrealized gain/loss relating to derivative contracts held at March 31, 2016:	$	(0.1	)

Fair Values of Non-Financial Assets and Liabilities

We concluded that none of our non-financial assets and liabilities subject to fair value assessments on a non-recurring basis required a material adjustment to the carrying amount of such assets and liabilities for the quarters ended March 31, 2016 and March 31, 2015.

XML

Earnings Per Share

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings Per Share

Net Income (Loss) Per Share

Basic and diluted net income (loss) per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):

	Quarter Ended
	March 31,
	2016		2015
Numerator:
Net income (loss)	$	26.3	$	(292.2	)
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	17,864		17,344
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	336		—
Diluted2	18,200		17,344
Net income (loss) per common share, Basic:	$	1.47	$	(16.85	)
Net income (loss) per common share, Diluted:	$	1.44	$	(16.85	)

______________________

¹  The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.

²  The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.

The following securities were excluded from the weighted-average diluted shares computation for the quarters ended March 31, 2016 and March 31, 2015 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended
	March 31,
	2016	2015
Options to purchase common shares	17	17
Non-vested common shares, restricted stock units and performance shares	33	187
Warrants1	—	636
Total excluded	50	840

______________________

¹  Net-share-settled warrants ("Warrants") relating to approximately 3.7 million notional common shares of our common stock were outstanding at March 31, 2015 at an exercise price of approximately $60.57 per share, and were settled during a period from July 1, 2015 through December 18, 2015.

During the quarter ended March 31, 2016 and March 31, 2015, we paid a total of approximately $8.2 million ($0.45 per common share) and $7.1 million ($0.40 per common share), respectively, in cash dividends to stockholders, including the holders of restricted stock, and dividend equivalents to the holders of certain restricted stock units and to the holders of performance shares granted prior to 2014 with respect to the target number of underlying common shares (constituting approximately one-half of the maximum payout).

From time to time, we repurchase shares pursuant to a stock repurchase program authorized by our Board of Directors. Repurchase transactions will occur at such times and prices as management deems appropriate and will be funded with our excess liquidity after giving consideration to, among other things, internal and external growth opportunities and future cash flows. Repurchases may be in open-market transactions or in privately negotiated transactions and the program may be modified or terminated by our Board of Directors at any time.

During the quarters ended March 31, 2016 and March 31, 2015, we repurchased 83,265 shares of common stock (at a weighted-average price of $76.85 per share) and 405,259 shares of common stock at a weighted-average price of $74.05 per share, respectively, pursuant to the stock repurchase program. The total cost of $6.4 million and $30.0 million was recorded as Treasury stock during the quarters ended March 31, 2016 and March 31, 2015, respectively. At March 31, 2016, $116.9 million were available to repurchase our common shares pursuant to the stock repurchase program.

XML

Segment Information

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment and Geographical Area Information

Segment and Geographical Area Information

Our primary line of business is the production of semi-fabricated specialty aluminum products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength ("Aero/HS products"), automotive ("Automotive Extrusions"), general engineering ("GE products") and other industrial end market applications ("Other products"). We operate 11 focused production facilities in the United States and one in Canada. Consistent with the manner in which our chief operating decision maker reviews and evaluates our business, the Fabricated Products business is treated as a single operating segment. At March 31, 2016, approximately 63% of our employees were covered by collective bargaining agreements and approximately 6% of our employees were covered by collective bargaining agreements with expiration dates occurring within one year from March 31, 2016.

In addition to the Fabricated Products segment, we have a business unit, All Other, which provides general and administrative support for our operations. For purposes of segment reporting under GAAP, we treat the Fabricated Products segment as a reportable segment. All Other is not considered a reportable segment.

The accounting policies of the Fabricated Products segment are the same as those described in Note 1. Segment results are evaluated internally by management before any allocation of corporate overhead and without any charge for income taxes, interest expense, or other net operating charges.

The following tables provide financial information by reporting segment and business unit for each period or as of each period-end, as applicable (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Net sales:
Fabricated Products	$	343.2		$	371.7
Segment operating income (loss):
Fabricated Products1	$	57.9		$	44.9
All Other2	(13.1		)	(503.5		)
Total operating income (loss)	$	44.8		$	(458.6	)
Interest expense	(3.7		)	(9.8		)
Other income, net	0.3			0.4
Income (loss) before income taxes	$	41.4		$	(468.0	)
Depreciation and amortization:
Fabricated Products	$	8.6		$	7.9
All Other	0.1			0.1
Total depreciation and amortization	$	8.7		$	8.0
Capital expenditures:
Fabricated Products	$	25.8		$	11.2
All Other	0.1			0.1
Total capital expenditures	$	25.9		$	11.3

_____________________

¹  Fabricated Products segment operating income included non-cash mark-to-market gain (loss) on primary aluminum, natural gas, electricity and foreign currency hedging activities, which totaled $4.0 million and $(4.5) million for the quarters ended March 31, 2016 and March 31, 2015, respectively. For further discussion regarding mark-to-market matters, see Note 8.

²  Operating loss in All Other included Net periodic postretirement benefit cost of $0.8 million and $0.6 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. Additionally, operating loss in All Other included (gain) loss on removal of Union VEBA net assets of $(0.1) million and $492.2 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. See Note 5 for further details.

	March 31, 2016		December 31, 2015
Assets:
Fabricated Products	$	932.5	$	904.7
All Other1	304.1		342.9
Total assets	$	1,236.6	$	1,247.6

_____________________

¹  Assets in All Other represent primarily all of our cash and cash equivalents, short-term investments, financial derivative assets (see Note 9) and net deferred income tax assets.

Net sales by product categories based on end market applications for the Fabricated Products segment were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Net sales:
Aero/HS products	$	176.9	$	180.3
Automotive Extrusions	48.4		50.1
GE products	105.4		119.1
Other products	12.5		22.2
Total net sales	$	343.2	$	371.7

Geographic information for income taxes paid were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Income taxes paid:
Fabricated Products –
United States	$	0.1	$	0.1
Canada	0.2		0.9
Total income taxes paid	$	0.3	$	1.0

The aggregate foreign currency transaction gain (loss) included in determining net income were immaterial for the quarters ended March 31, 2016 and March 31, 2015.

For the quarter ended March 31, 2016, one customer represented 25% and another represented 10% of Fabricated Products Net sales. For the quarter ended March 31, 2015, one customer represented 23% and another represented 10% of Fabricated Products Net Sales.

At March 31, 2016, one customer represented 19% and one other individual customer represented 12% of the trade receivables balance. Two individual customers accounted for 17% of the trade receivables balance at December 31, 2015. 

Information for delivery of our primary aluminum supply from our major suppliers were as follows:

	Quarter Ended
	March 31,
	2016		2015
Percentage of total primary aluminum supply (lbs):
Supply from the Company's top five major suppliers	83	%	75	%
Supply from the Company's largest supplier	30	%	29	%
Supply from the Company's second and third largest suppliers	35	%	29	%

XML

Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Three Months Ended
	March 31,
	2016		2015
	(In millions of dollars)
Interest paid	$	0.3	$	0.1
Non-cash investing and financing activities:
Stock repurchases not yet settled (accrued in accounts payable)	$	0.1	$	1.8
Unpaid purchases of property and equipment	$	2.0	$	1.3

XML

Other Income (Expense), Net

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Other Income (Expense), Net

Other Income, Net

Other income, net consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Interest income	$	0.1	$	0.2
Realized gain on investments	—		0.3
All other income (expense), net	0.2		(0.1		)
Other income, net	$	0.3	$	0.4

XML

Other Comprehensive Income

3 Months Ended

Mar. 31, 2016

Statement of Comprehensive Income [Abstract]

Other Comprehensive Income Disclosure

Other Comprehensive Income

The following table presents the tax effect allocated to each component of other comprehensive income for each period presented (in millions of dollars):

	Before-Tax		Income Tax			Net-of-Tax
	Amount		(Expense) Benefit3			Amount
Quarter Ended March 31, 2016
Salaried VEBA:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.1	$	—		$	0.1
Amortization of prior service cost1	1.0		(0.4		)	0.6
Other comprehensive income relating to Salaried VEBA	1.1		(0.4		)	0.7
Foreign currency translation gain on Canadian pension plan	0.1		—			0.1
Unrealized gain on foreign currency cash flow hedges	0.2		(0.1		)	0.1
Other comprehensive income	$	1.4	$	(0.5	)	$	0.9
Quarter Ended March 31, 2015
VEBAs:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.3	$	(0.1	)	$	0.2
Amortization of prior service cost1	0.7		(0.3		)	0.4
Removal of obligation relating to Union VEBA	106.6		(40.4		)	66.2
Other comprehensive income relating to VEBAs	107.6		(40.8		)	66.8
Available for sale securities:
Reclassification of unrealized loss upon sale of available for sale securities2	0.1		(0.1		)	—
Other comprehensive income relating to available for sale securities	0.1		(0.1		)	—
Foreign currency translation gain	0.1		—			0.1
Other comprehensive income	$	107.8	$	(40.9	)	$	66.9

________________

¹  Amounts reclassified out of Accumulated other comprehensive loss relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to the Salaried VEBA.

²  Amounts reclassified out of Accumulated other comprehensive loss relating to sales of available for sale securities were included as a component of Other (expense) income, net. We use the specific identification method to determine the amount reclassified out of Accumulated other comprehensive loss.

³  Income tax amounts reclassified out of Accumulated other comprehensive loss were included as a component of Income tax (provision) benefit.

XML

Guarantor and Non-Guarantor Financial Statements (Notes)

3 Months Ended

Mar. 31, 2016

Guarantor and Non-Guarantor Financial Statement [Abstract]

Guarantor and Non-Guarantor Financial Statements

Condensed Guarantor and Non-Guarantor Financial Information

Our Senior Notes were issued pursuant to an indenture dated May 23, 2012 ("Indenture"), among Kaiser Aluminum Corporation ("Parent"), the subsidiary guarantors party thereto ("Guarantor Subsidiaries") and Wells Fargo Bank, National Association, as trustee ("Trustee"). The Guarantor Subsidiaries currently include Kaiser Aluminum Investments Company, Kaiser Aluminum Fabricated Products, LLC, Kaiser Aluminum Mill Products, Inc., Kaiser Aluminum Washington, LLC and Kaiser Aluminum Alexco, LLC, all of which are 100% owned by the Parent. The guarantees are full and unconditional and joint and several but have customary releases in the following situations: (i) the sale of the Guarantor Subsidiary or all of its assets; (ii) the declaration of a Guarantor Subsidiary as an unrestricted subsidiary under the Indenture; (iii) the termination or release of the Guarantor Subsidiary's guarantee of certain other indebtedness; or (iv) our exercise of legal defeasance or covenant defeasance or the discharge of our obligations under the Indenture.

The following condensed consolidating financial information as of March 31, 2016 and December 31, 2015, and for the quarters ended March 31, 2016 and March 31, 2015present: (i) the financial position, results of operation and cash flows for each of (a) Parent, (b) the Guarantor Subsidiaries on a combined basis and (c) the Non-Guarantor Subsidiaries (as defined below) on a combined basis; (ii) the adjustments necessary to eliminate investments in subsidiaries and intercompany balances and transactions among Parent, the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries; and (iii) the resulting totals, reflecting information for us on a consolidated basis, as reported. In the following tables, "Non-Guarantor Subsidiaries" refers to Kaiser Aluminum Canada Limited, Trochus Insurance Company, DCO Management, LLC, Kaiser Aluminum France, S.A.S. and Kaiser Aluminum Beijing Trading Company; and "Consolidating Adjustments" represent the adjustments necessary to eliminate the investments in our subsidiaries and other intercompany sales and cost of sales transactions. The condensed consolidating financial information should be read in conjunction with the consolidated financial statements herein.

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

March 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	69.1	$	1.6	$	—		$	70.7
Short-term investments	—		10.0		—		—			10.0
Receivables:
Trade receivables – net	—		134.0		4.8		—			138.8
Intercompany receivables	93.6		23.1		1.3		(118.0		)	—
Other	—		5.9		2.7		—			8.6
Inventories	—		208.3		5.8		(3.5		)	210.6
Prepaid expenses and other current assets	0.1		8.5		0.8		(0.3		)	9.1
Total current assets	93.7		458.9		17.0		(121.8		)	447.8
Investments in and advances to subsidiaries	912.8		32.0		—		(944.8		)	—
Property, plant and equipment – net	—		473.1		31.4		—			504.5
Long-term intercompany receivables	—		—		3.9		(3.9		)	—
Deferred tax assets – net	—		190.5		—		7.0			197.5
Intangible assets – net	—		30.1		—		—			30.1
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.4		0.1		—			19.5
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.6	$	64.6	$	5.0	$	—		$	70.2
Intercompany payable	17.9		99.3		4.5		(121.7		)	—
Accrued salaries, wages and related expenses	—		32.4		1.5		—			33.9
Other accrued liabilities	5.4		51.3		0.2		(0.4		)	56.5
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	23.9		247.7		11.2		(122.1		)	160.7
Net liabilities of Salaried VEBA	—		18.7		—		—			18.7
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.9		—		(3.9		)	—
Long-term liabilities	—		66.2		6.3		—			72.5
Long-term debt	194.8		—		—		—			194.8
Total liabilities	218.7		336.5		19.6		(126.0		)	448.8
Total stockholders' equity	787.8		904.7		32.8		(937.5		)	787.8
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2015

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	72.2	$	0.3	$	—		$	72.5
Short-term investments	—		30.0		—		—			30.0
Receivables:
Trade receivables – net	—		114.0		2.7		—			116.7
Intercompany receivables	—		111.2		1.1		(112.3		)	—
Other	—		3.8		2.3		—			6.1
Inventories	—		216.3		6.6		(3.3		)	219.6
Prepaid expenses and other current assets	0.2		56.2		1.7		(1.4		)	56.7
Total current assets	0.2		603.7		14.7		(117.0		)	501.6
Investments in and advances to subsidiaries	1,077.2		31.4		—		(1,108.6		)	—
Property, plant and equipment – net	—		464.3		31.1		—			495.4
Long-term intercompany receivables	—		—		3.1		(3.1		)	—
Deferred tax assets – net	—		156.3		—		7.0			163.3
Intangible assets – net	—		30.5		—		—			30.5
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.5		0.1		—			19.6
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.5	$	73.6	$	2.6	$	—		$	76.7
Intercompany payable	106.5		14.8		4.0		(125.3		)	—
Accrued salaries, wages and related expenses	—		38.3		1.5		—			39.8
Other accrued liabilities	1.4		52.3		0.4		(1.4		)	52.7
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	108.4		179.1		8.5		(126.7		)	169.3
Net liabilities of Salaried VEBA	—		19.0		—		—			19.0
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.1		—		(3.1		)	—
Long-term liabilities	—		81.3		6.2		—			87.5
Long-term debt	194.6		—		—		—			194.6
Total liabilities	303.0		282.5		16.8		(129.8		)	472.5
Total stockholders' equity	774.4		1,060.4		32.2		(1,091.9		)	775.1
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)

(In millions of dollars)

Quarter Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	335.7		$	26.4		$	(18.9	)	$	343.2
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			257.1			23.1			(18.2		)	262.0
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(4.0		)	—			—			(4.0		)
Depreciation and amortization	—			8.2			0.5			—			8.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.8			23.6			2.2			(0.5		)	26.1
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	0.8			24.3			2.2			(0.5		)	26.8
Total costs and expenses	0.8			290.5			25.8			(18.7		)	298.4
Operating (loss) income	(0.8		)	45.2			0.6			(0.2		)	44.8
Other (expense) income:
Interest expense	(4.3		)	0.6			—			—			(3.7		)
Other (expense) income, net	—			0.3			—			—			0.3
Income (loss) before income taxes	(5.1		)	46.1			0.6			(0.2		)	41.4
Income tax (provision) benefit	—			(16.9		)	(0.2		)	2.0			(15.1		)
Earnings (loss) in equity of subsidiaries	31.4			0.3			—			(31.7		)	—
Net income (loss)	$	26.3		$	29.5		$	0.4		$	(29.9	)	$	26.3
Comprehensive income	$	27.2		$	30.3		$	0.5		$	(30.8	)	$	27.2

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE (LOSS) INCOME

(In millions of dollars)

Quarter Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
Net sales	$	—		$	363.4		$	34.7	$	(26.4	)	$	371.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			296.4			31.6		(25.7		)	302.3
Unrealized loss on derivative instruments	—			4.5			—		—			4.5
Depreciation and amortization	—			7.7			0.3		—			8.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			20.7			1.6		(0.6		)	22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.6			—		—			0.6
Loss on removal of Union VEBA net assets	—			492.2			—		—			492.2
Total selling, general, administrative, research and development	1.0			513.5			1.6		(0.6		)	515.5
Total costs and expenses	1.0			822.1			33.5		(26.3		)	830.3
Operating (loss) income	(1.0		)	(458.7		)	1.2		(0.1		)	(458.6		)
Other (expense) income:
Interest expense	(9.5		)	(0.5		)	—		0.2			(9.8		)
Other (expense) income, net	—			0.5			0.1		(0.2		)	0.4
(Loss) income before income taxes	(10.5		)	(458.7		)	1.3		(0.1		)	(468.0		)
Income tax benefit	—			171.9			—		3.9			175.8
(Loss) earnings in equity of subsidiaries	(281.7		)	1.1			—		280.6			—
Net (loss) income	$	(292.2	)	$	(285.7	)	$	1.3	$	284.4		$	(292.2	)
Comprehensive (loss) income	$	(225.3	)	$	(218.9	)	$	1.4	$	217.5		$	(225.3	)

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash provided by operating activities1	$	17.2		$	201.4		$	2.7		$	(200.0	)	$	21.3
Cash flows from investing activities:
Capital expenditures	—			(25.3		)	(0.6		)	—			(25.9		)
Proceeds from disposition of available for sale securities	—			20.0			—			—			20.0
Net cash used in investing activities	—			(5.3		)	(0.6		)	—			(5.9		)
Cash flows from financing activities:
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.7		)	—			—			—			(2.7		)
Repurchase of common stock	(6.3		)	—			—			—			(6.3		)
Cash dividends paid to stockholders	(8.2		)	—			—			—			(8.2		)
Cash dividends paid to Parent	—			(200.0		)	—			200.0			—
Intercompany loan	—			0.8			(0.8		)	—			—
Net cash (used in) provided by financing activities	(17.2		)	(199.2		)	(0.8		)	200.0			(17.2		)
Net (decrease) increase in cash and cash equivalents during the period	—			(3.1		)	1.3			—			(1.8		)
Cash and cash equivalents at beginning of period	—			72.2			0.3			—			72.5
Cash and cash equivalents at end of period	$	—		$	69.1		$	1.6		$	—		$	70.7

________________

¹  The Guarantor Subsidiaries’ Net cash provided by operating activities reflects a decrease in current Intercompany receivables from the Parent and an increase in current Intercompany payable to the Parent related to the $200.0 million dividend made by the Guarantor Subsidiaries to the Parent.  The dividend to the Parent and intercompany activity is eliminated within the consolidating adjustments.

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$	37.8		$	(32.7	)	$	2.3		$	—	$	7.4
Cash flows from investing activities:
Capital expenditures	—			(6.7		)	(4.6		)	—		(11.3		)
Proceeds from disposition of available for sale securities	—			84.0			—			—		84.0
Net cash provided by (used in) investing activities	—			77.3			(4.6		)	—		72.7
Cash flows from financing activities:
Payment of capital lease liability	—			(0.1		)	—			—		(0.1		)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	—			1.0			—			—		1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.5		)	—			—			—		(2.5		)
Repurchase of common stock	(28.2		)	—			—			—		(28.2		)
Cash dividend paid to stockholders	(7.1		)	—			—			—		(7.1		)
Intercompany loan	—			(1.9		)	1.9			—		—
Net cash (used in) provided by financing activities	(37.8		)	(1.0		)	1.9			—		(36.9		)
Net increase (decrease) in cash and cash equivalents during the period	—			43.6			(0.4		)	—		43.2
Cash and cash equivalents at beginning of period	—			175.3			2.4			—		177.7
Cash and cash equivalents at end of period	$	—		$	218.9		$	2.0		$	—	$	220.9

XML

Subsequent Events

3 Months Ended

Mar. 31, 2016

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Tax Asset Protection Rights Agreement. On April 7, 2016 our Board of Directors adopted a Tax Asset Protection Rights Plan ("Rights Plan") designed to preserve our ability to utilize without limitation our net operating loss carryforwards and other significant tax attributes to offset future taxable income. The Rights Plan was adopted because certain stock transfer restrictions designed to preserve our tax benefits currently contained in our certificate of incorporation are scheduled to expire on July 6, 2016. At our 2016 Annual Meeting of Stockholders, we intend to seek stockholder approval of the Rights Plan, as well as stockholder approval of an amendment to our certificate of incorporation that would implement stock transfer restrictions to replace those that are expiring.

Preferred Stock. In connection with the Rights Plan, our Board of Directors declared a dividend, payable April 22, 2016, of a right (a "Right") to purchase one Series A Junior Participating Preferred Stock (the "Series A Preferred") for each outstanding share of our common stock, par value $0.01 per share. The number of shares constituting Series A Preferred, par value $0.01 per share, is 900,000. If the Rights become exercisable, each Right would allow its holder to purchase one one-hundredth of a share of our Series A Preferred for a purchase price of $400.00. Each fractional share of Series A Preferred Stock would give the stockholder approximately the same dividend, voting and liquidation rights as does one share of common stock. Prior to exercise, however, a Right does not give its holder any dividend, voting or liquidation rights.

The Rights will not be exercisable until the earlier of: (i) 10 days after a public announcement by us that a person or group has become an acquiring person and (ii) 10 business days (or a later date determined by our board of directors) after a person or group begins a tender or exchange offer that, if completed, would result in that person or group becoming an acquiring Person.

Until the date that the Rights become exercisable (the "Distribution Date"), common stock certificates will also evidence the Rights and will contain a notation to that effect. Any transfer of shares of common stock prior to the Distribution Date will constitute a transfer of the associated Rights. After the Distribution Date, the Rights will separate from the common stock and be evidenced by Right certificates, which we will mail to all holders of Rights that have not become void. After the Distribution Date, if a person or group already is or becomes an acquiring person, all holders of Rights, except the acquiring person, may exercise their Rights upon payment of the purchase price to purchase shares of common stock (or other securities or assets as determined by the Board of Directors) with a market value of two times the purchase price (a "Flip-in Event"). After the Distribution Date, if a Flip-in Event has already occurred and we are acquired in a merger or similar transaction, all holders of Rights except the acquiring person may exercise their Rights upon payment of the purchase price, to purchase shares of the acquiring or other appropriate entity with a market value of two times the purchase price of the Rights. Rights may be exercised to purchase Series A Preferred only after the Distribution Date occurs and prior to the occurrence of a Flip-in Event as described above. A Distribution Date resulting from the commencement of a tender offer or exchange offer as described in (ii) above could precede the occurrence of a Flip-in Event, in which case the Rights could be exercised to purchase Series A Preferred. A Distribution Date resulting from any occurrence described in (i) above would necessarily follow the occurrence of a Flip-in Event, in which case the Rights could be exercised to purchase shares of our common stock (or other securities or assets) as described above. Additional information regarding the Rights Plan is contained in the Current Report on Form 8-K and in the Registration Statement on Form 8-A, both filed by the Company with the SEC on April 8, 2016.

Dividend Declaration. On April 15, 2016, we announced that our Board of Directors declared a cash dividend of $0.45 per common share or approximately $8.1 million (including dividend equivalents), which will be paid on or about May 13, 2016 to stockholders of record at the close of business on April 25, 2016.

XML

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Organization and Nature of Operations

Organization and Nature of Operations. Kaiser Aluminum Corporation specializes in the production of semi-fabricated specialty aluminum products, such as aluminum plate and sheet and extruded and drawn products, primarily used in aerospace/high strength, automotive, general engineering and other industrial end market applications. Our business is organized into one operating segment, Fabricated Products. See Note 11 for additional information regarding our reportable segment and business unit.

Principles of Consolidation and Basis of Presentation

Principles of Consolidation and Basis of Presentation. The accompanying unaudited 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") applicable for interim periods and, therefore, do not include all information and footnotes required by GAAP for complete financial statements. In management's opinion, all adjustments (which include normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for our interim periods are not necessarily indicative of the results of operations that may be achieved for the entire 2016 fiscal year. The financial information as of December 31, 2015 is derived from our audited consolidated financial statements and footnotes for the year ended December 31, 2015 included in our Annual Report on Form 10-K. See New Accounting Pronouncements below for a discussion of new accounting pronouncements we adopted during the quarter ended March 31, 2016 requiring cumulative-effect adjustments that impacted our consolidated financial statements and footnotes for the year ended December 31, 2015.

Use of Estimates in the Preparation of Financial Statements

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.

Inventories

Inventories. Inventories are stated at the lower of cost or market value. On March 31, 2016, we recorded an inventory write-down of $4.9 million to reflect the net realizable value as of that date. The net realizable value reflected commitments as of that date from customers to purchase our inventory at prices that exceeded the Midwest Transaction Price ("Midwest Price"), which reflects the primary aluminum supply/demand dynamics in North America, reduced by an approximate normal profit margin. If we encounter a further decrease in our net realizable value of inventory, we may be subject to additional inventory lower of cost or market value adjustments.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At March 31, 2016, after adjusting for the inventory write down discussed above, the stated LIFO value of the inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $17.7 million. Additionally, during the quarter ended March 31, 2016, we decremented a prior year, higher cost LIFO layer, which resulted in an insignificant charge. The excess of current cost over the stated LIFO value of inventory at December 31, 2015 was $24.1 million. 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 our inventories at March 31, 2016 and December 31, 2015 were included in the Fabricated Products segment (see Note 2 for the components of inventories).

Property, Plant and Equipment - Net

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 $0.9 million and $0.3 million during the quarters ended March 31, 2016 and March 31, 2015, 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 and other items, but is included in Depreciation and amortization on the Statements of Consolidated Income (Loss). For the quarters ended March 31, 2016 and March 31, 2015, we recorded depreciation expense of $8.2 million and $7.5 million, respectively, relating to our operating facilities in the Fabricated Products segment. An immaterial amount of depreciation expense was also recorded within All Other for all periods presented in this Report.

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.

Derivatives, Policy [Policy Text Block]

Foreign Currency Risk Management. From time to time, we enter into foreign currency forward contracts to protect the value of anticipated foreign currency expenses associated with cash commitments for equipment purchases. These derivative instruments are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. Both realized and unrealized periodic gains and losses of derivative instruments designated as cash flow hedges are deferred in Accumulated other comprehensive income until depreciation on the underlying equipment commences. Upon commencement, realized gains and losses are recorded in Net income (loss) as an adjustment to depreciation expense in the period in which depreciation is recognized on the underlying equipment. Depending on the time to maturity and asset or liability position, the carrying values of cash flow hedges are included in Prepaid expenses and other current assets, Other assets, Other accrued liabilities or Long-term liabilities. We report the effective portion of our cash flow hedges in the same financial statement line item as changes in the fair value of the hedged item.

In order to qualify for hedge accounting treatment, derivative instruments must be effective at reducing the risk associated with the exposure being hedged and must be designated as a hedge at the inception of the instrument contract. Hedge effectiveness is assessed periodically. Any derivative instrument not designated as a hedge, or so designated but ineffective, is adjusted to market value and recognized in net income immediately. If a cash flow hedge ceases to qualify for hedge accounting treatment, the derivative instrument would continue to be carried on the balance sheet at fair value until settled and future adjustments to the derivative instrument's fair value would be recognized in Net income (loss) immediately. If a forecasted equipment purchase was no longer probable to occur, amounts previously deferred in Accumulated other comprehensive income (loss) would be recognized immediately in Net income (loss). See Note 8 for additional information.

We are exposed to counterparty credit risk on all of our derivative instruments. Accordingly, we have established and maintained strict counterparty credit guidelines and entered into hedges only with major financial institutions that are investment grade or better. We do not have significant exposure to any one counterparty and management believes the risk of loss is remote and in any event would not be material. Additionally, we do not require collateral under these agreements.

New Accounting Pronouncements

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs("ASU 2015-03"), was issued in April 2015. ASU 2015-03 requires debt issuance costs related to a recognized debt liability to be presented in an entity's balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts, instead of being presented as a deferred charge in the balance sheet. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-03. During the quarter ended March 31, 2016, we retrospectively adopted ASU 2015-03, which resulted in a reclassification of $3.2 million of debt issuance costs related to our Senior Notes (as defined in Note 3) from Other assets to Long-term debt as of December 31, 2015.

ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30) - Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements ("ASU 2015-15") was issued in August 2015 to address the presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements. The recognition and measurement guidance for debt issuance costs is not affected by ASU 2015-15. Our adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

ASU No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) ("ASU 2015-07"), was issued in May 2015. This ASU removes the requirement to categorize within the fair value hierarchy table investments without readily determinable fair values in entities that elect to measure fair value using net asset value per share ("NAV") or its equivalent. ASU 2015-07 requires that these investments continue to be shown in the fair value disclosure in order to allow the disclosure to reconcile to the investment amount presented in the balance sheet. Our retrospective adoption of this ASU in the first quarter of 2016 did not have a material impact on our consolidated financial statements.

ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), was issued in August 2015. ASU 2015-14 defers the effective date of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was issued in May 2014 and requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, by one year for all entities and permits early adoption on a limited basis. We expect to adopt ASU 2014-09 for the fiscal year ending December 31, 2018 and will continue to assess the impact of the adoption on our consolidated financial statements; however, based on our assessments to date, we do not expect the adoption of this ASU to have a material impact on our consolidated financial statements.

ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes ("ASU 2015-17"), was issued in November 2015. ASU 2015-17 requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. This ASU does not, however, change the existing requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount. During the quarter ended March 31, 2016, we early adopted this ASU on a prospective basis. As such, prior periods were not retrospectively adjusted.

ASU No. 2016-02, Leases (Topic 842): Amendments to the Financial Accounting Standards Board Accounting Standards Codification ("ASU 2016-02"), was issued in February 2016. Under ASU 2016-02, lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). For income statement purposes, a dual model was retained, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). ASU 2016-02 becomes effective for us in the first quarter of 2019. We are currently evaluating whether to early adopt the standard and what impact it will have on our consolidated financial statements, which we expect will be material.

ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), was issued in March 2016. ASU 2016-09 eliminates additional paid in capital ("APIC") pools and requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled. The accounting for an employee's use of shares to satisfy the employer's statutory income tax withholding obligation and the accounting for forfeitures is also changing. ASU 2016-09 becomes effective for us in the first quarter of 2017. We early adopted ASU 2016-09 during the quarter ended March 31, 2016. See Note 4 and Note 6 for a discussion on the impact of our adoption of ASU 2016-09.

XML

Supplemental Balance Sheet Information Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Disclosures

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	34.5		$	40.3
Commercial paper	36.2			32.2
Total	$	70.7		$	72.5
Trade Receivables – Net
Billed trade receivables	$	139.4		$	116.8
Unbilled trade receivables	0.2			0.7
Trade receivables, gross	139.6			117.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables – net	$	138.8		$	116.7
Inventories
Finished products	$	66.8		$	79.5
Work-in-process	73.4			63.6

	March 31, 2016			December 31, 2015
	(In millions of dollars)
Raw materials	46.7			53.4
Operating supplies and repair and maintenance parts	23.7			23.1
Total	$	210.6		$	219.6
Prepaid Expenses and Other Current Assets
Current derivative assets – Notes 8 and 9	$	1.4		$	1.5
Current deferred tax assets1	—			49.6
Prepaid taxes	3.3			—
Prepaid insurance	1.1			1.9
Short-term restricted cash	0.3			0.3
Other	3.0			3.4
Total	$	9.1		$	56.7
Property, Plant and Equipment – Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	72.5			71.8
Machinery and equipment	559.3			549.0
Construction in progress	54.8			48.5
Property, plant and equipment – gross	709.3			692.0
Accumulated depreciation	(205.1		)	(196.9		)
Assets held for sale	0.3			0.3
Property, plant and equipment – net	$	504.5		$	495.4
Other Assets
Restricted cash	$	10.9		$	10.9
Deferred financing costs on Revolving Credit Facility	1.1			1.3
Deferred compensation plan assets	7.3			7.3
Derivative assets – Notes 8 and 9	0.2			0.1
Total	$	19.5		$	19.6
Other Accrued Liabilities
Current derivative liabilities – Notes 8 and 9	$	10.3		$	14.1
Uncleared cash disbursements	10.0			8.0
Accrued income taxes and taxes payable	8.6			3.1
Accrued annual contribution to VEBAs	—			19.6
Accrued contingent contribution to Union VEBA – Note 5	17.1			—
Short-term environmental accrual – Note 7	1.3			1.6
Accrued interest	5.5			1.5
Short-term deferred revenue	0.8			1.2
Other	2.9			3.6
Total	$	56.5		$	52.7

	March 31, 2016		December 31, 2015
	(In millions of dollars)
Long-Term Liabilities
Derivative liabilities – Notes 8 and 9	$	1.7	$	2.1
Income tax liabilities	0.8		0.7
Workers' compensation accruals	24.1		21.7
Long-term environmental accrual – Note 7	16.8		17.0
Long-term asset retirement obligations	4.9		4.8
Deferred compensation liability	7.8		7.7
Long-term deferred revenue	0.3		0.3
Long-term capital leases	0.1		0.1
Long-term portion of contingent contribution to Union VEBA – Note 5	12.8		29.9
Other long-term liabilities	3.2		3.2
Total	$	72.5	$	87.5

XML

Income Tax Matters (Tables)

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Tax Provision

The provision for (benefit from) incomes taxes for each period presented consisted of the following (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Domestic	$	14.9	$	(175.8	)
Foreign	0.2		—
Total	$	15.1	$	(175.8	)

XML

Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of (Income) Charges Related to Benefit Plans

The following table presents the components of net periodic benefit cost for the Salaried VEBA and charges relating to all other employee benefit plans for the periods presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Salaried VEBA:
Service cost1	$	—		$	—
Interest cost	0.7			0.7
Expected return on plan assets	(1.0		)	(1.1		)
Amortization of prior service cost	1.0			0.7
Amortization of net actuarial loss	0.1			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	0.8			0.6
(Gain) loss on removal of Union VEBA net assets	(0.1		)	492.2
Other employee benefit plans:
Deferred compensation plan	0.1			0.4
Defined contribution plans	4.0			4.0
Multiemployer pension plans	1.1			0.9
Total other employee benefit plans	$	5.2		$	5.3
Total	$	5.9		$	498.1

____________

¹  The service cost was insignificant for all periods presented.

The following table presents the allocation of the charges (income) detailed above, by reportable segment and business unit (in millions of dollars – see Note 11):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	4.7	$	4.6
All Other	1.2		493.5
Total	$	5.9	$	498.1

XML

Employee Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Compensation expense relating to short term incentive plans

recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the first quarter performance period of our 2016 STI Plans.

Non-cash compensation expense

Non-cash compensation expense by type of award under LTI Programs was as follows for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares and restricted stock units	$	1.1	$	1.1
EVA-Based Performance Shares	0.3		0.4
TSR-Based Performance Shares	1.1		0.6
CP-Based Performance Shares	$	0.1	$	—
Total non-cash compensation expense	$	2.6	$	2.1

The following table presents the allocation of the charges detailed above, by segment (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Fabricated Products	$	0.8	$	0.7
All Other	1.8		1.4
Total non-cash compensation expense	$	2.6	$	2.1

Unrecognized gross compensation cost data

The following table presents unrecognized gross compensation cost data by type of award as of March 31, 2016:

	Unrecognized gross compensation costs (in millions of dollars)		Expected period (in years) over which the remaining gross compensation costs will be recognized
Non-vested common shares and restricted stock units	$	8.3	2.3
CP-Based Performance Shares	$	4.7	2.9
TSR-Based Performance Shares	$	10.5	2.2

Summary of activity of non-vested common shares, restricted stock units, and performance shares

A summary of the activity with respect to non-vested common shares, restricted stock units, EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares for the quarter ended March 31, 2016 is as follows:

	Non-Vested Common Shares				Restricted Stock Units				EVA-Based Performance Shares				CP-Based Performance Shares				TSR-Based Performance Shares
	Shares		Weighted-Average Grant-Date Fair Value per Share		Units		Weighted-Average Grant-Date Fair Value per Unit		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share		Shares		Weighted-Average Grant-Date Fair Value per Share
Outstanding at December 31, 2015	156,553		$	67.20	5,521		$	66.64	155,105		$	57.76	—		$	—	299,877		$	89.43
Granted1	—		—		52,705		74.49		—		—		63,983		80.46		95,974		93.02
Vested	(38,812	)	60.75		(1,762	)	63.18		(49,611	)	57.76		—		—		—		—
Forfeited1	(172	)	68.99		(165	)	74.49		—		—		(164	)	80.46		(1,115	)	90.06
Canceled1	—		—		—		—		(105,494	)	57.76		—		—		—		—
Outstanding at March 31, 2016	117,569		$	69.33	56,299		$	74.07	—		$	—	63,819		$	80.46	394,736		$	90.30

____________

¹  For EVA-Based Performance Shares, CP-Based Performance Shares and TSR-Based Performance Shares, the number of shares granted and forfeited are presented at their maximum payout; and the number of shares canceled includes the number of shares that did not vest due to EVA performance results falling below those required for maximum payout.

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted-average grant-date fair value per share for shares granted by type of award was as follows for each period presented:

	Quarter Ended
	March 31,
	2016		2015
Non-vested common shares	$	—	$	69.83
Restricted stock units	$	74.49	$	69.83
CP-Based Performance Shares	$	80.46	$	—
TSR-Based Performance Shares	$	93.02	$	95.68

XML

Derivative Financial Instruments and Related Hedging Programs (Tables)

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of realized and unrealized gains and losses

Realized and unrealized (losses) gains associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016			2015
Included in Other Comprehensive Income (Loss):
Unrealized gain:
Foreign Currency	$	0.2		$	—
Included in Statements of Consolidated Income (Loss):
Realized loss1:
Aluminum	(2.7		)	(2.7		)
Natural Gas	(1.7		)	(1.3		)
Electricity	—			(0.7		)
Total realized loss	$	(4.4	)	$	(4.7	)
Unrealized gain (loss)2:
Non-designated hedges of operational risk:
Aluminum	$	3.2		$	(4.2	)
Natural Gas	0.8			(0.7		)
Electricity	—			0.4
Total non-designated hedges of operational risk	4.0			(4.5		)
Option Assets relating to the Convertible Notes3	—			10.2
Bifurcated Conversion Feature of the Convertible Notes3	—			(10.2		)
Total unrealized gain (loss)	$	4.0		$	(4.5	)

______________________

¹  Realized loss on hedges of operational risk are recorded within Cost of products sold, excluding depreciation, amortization and other items.

²  Unrealized gain (loss) on hedges of operational risk are recorded within Unrealized (gain) loss on derivative instruments.

³  Unrealized gain (loss) on financial derivatives related to our 4.5% unsecured cash convertible senior notes ("Convertible Notes"), which settled in April 2015.

Summary of material derivative positions

The following table summarizes our material derivative positions at March 31, 2016:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Call option purchase contracts	4/16 through 6/16	2.0
Fixed price purchase contracts	4/16 through 12/17	128.4
Fixed price sales contracts	4/16 through 12/17	2.2
Midwest premium swap contracts1	4/16 through 12/17	92.0

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	4/16 through 12/18	7,070,000

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	5/16 through 8/17	3,950,374

______________________

¹  Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on our purchases of primary aluminum.

²  As of March 31, 2016, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 79%, 73% and 72% of the expected natural gas purchases for the remainder of 2016, 2017 and 2018 respectively.

Summary of offsetting derivative assets by counterparty

The following tables present offsetting information regarding our derivatives by type of counterparty as of December 31, 2015 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.3	$	—	$	1.3	$	1.3	$	—	$	—
Counterparty (with partial netting agreements)	0.3		—		0.3		0.3		—		—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

The following tables present offsetting information regarding our derivatives by type of counterparty as of March 31, 2016 (in millions of dollars):

Derivative Assets and Collateral Held by Counterparty
							Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Financial Instruments		Cash Collateral Received		Net Amount
Counterparty (with netting agreements)	$	1.0	$	—	$	1.0	$	1.0	$	—	$	—
Counterparty (with partial netting agreements)	0.6		—		0.6		0.6		$	—	$	—
Total	$	1.6	$	—	$	1.6	$	1.6	$	—	$	—

Summary of offsetting derivative liabilities by counterparty

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(8.5	)	$	—	$	(8.5	)	$	(1.3	)	$	—	$	(7.2	)
Counterparty (with partial netting agreements)	(7.7		)	—		(7.7		)	(0.3		)	—		(7.4		)
Total	$	(16.2	)	$	—	$	(16.2	)	$	(1.6	)	$	—	$	(14.6	)

Derivative Liabilities and Collateral Held by Counterparty
									Gross Amounts Not Offset in the Consolidated Balance Sheets
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Financial Instruments			Cash Collateral Pledged		Net Amount
Counterparty (with netting agreements)	$	(6.3	)	$	—	$	(6.3	)	$	(1.0	)	$	—	$	(5.3	)
Counterparty (with partial netting agreements)	(5.7		)	—		(5.7		)	(0.6		)	—		(5.1		)
Total	$	(12.0	)	$	—	$	(12.0	)	$	(1.6	)	$	—	$	(10.4	)

XML

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Summary of assets and liabilities measured and recognized at fair value on a recurring basis

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	March 31, 2016
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.8			—			0.8
Midwest premium swap contracts	—			—			0.5			0.5
Natural Gas -
Fixed priced purchase contracts	—			0.1			—			0.1
All Other Financial Assets:
Cash and cash equivalents	34.5			36.2			—			70.7
Short-term investments	—			10.0			—			10.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	34.5		$	54.6		$	0.5		$	89.6
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(5.6	)	$	—		$	(5.6	)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas –Fixed price purchase contracts	—			(6.1		)	—			(6.1		)
All Other Financial Liabilities:
Senior Notes	(205.7		)	—			—			(205.7		)
Total liabilities	$	(205.7	)	$	(11.7	)	$	(0.3	)	$	(217.7	)

The following table presents our financial instruments, classified under the appropriate level of the fair value hierarchy, as of the period presented (in millions of dollars):

	December 31, 2015
	Level 1			Level 2			Level 3			Total
FINANCIAL ASSETS:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Call option purchase contracts	$	—		$	0.2		$	—		$	0.2
Fixed price purchase contracts	—			0.3			—			0.3
Fixed price sales contracts	—			0.2			—			0.2
Midwest premium swap contracts	—			—			0.9			0.9
All Other Financial Assets:
Cash and cash equivalents	40.3			32.2			—			72.5
Short-term investments	—			30.0			—			30.0
Deferred compensation plan assets	—			7.3			—			7.3
Total assets	$	40.3		$	70.2		$	0.9		$	111.4
FINANCIAL LIABILITIES:
Derivative Instruments (Non-Designated Hedges):
Aluminum –
Fixed price purchase contracts	$	—		$	(8.9	)	$	—		$	(8.9	)
Fixed price sales contracts	—			(0.1		)	—			(0.1		)
Midwest premium swap contracts	—			—			(0.3		)	(0.3		)
Natural Gas – Fixed price purchase contracts	—			(6.7		)	—			(6.7		)
Derivative Instruments (Designated Hedges):
Foreign Currency – Euro forward purchase contracts	—			(0.2		)	—			(0.2		)
All Other Financial Liabilities:
Senior Notes	(207.3		)	—			—			(207.3		)
Total liabilities	$	(207.3	)	$	(15.9	)	$	(0.3	)	$	(223.5	)

Schedule of quantitative information for Level 3 Midwest premiums derivative contracts

quantitative information for Level 3 Midwest premium derivative contracts:

	Fair Value at March 31, 2016 (in millions of dollars)			Valuation technique	Unobservable input	Settlement Period	Range ($ in unit price)
Assets:
Midwest premium contracts	$	0.5		Discounted fair value	Forward price curve	Apr-16 through Dec-17	$0.083 per metric ton to $0.084 per metric ton
Liabilities:
Midwest premium contracts	$	(0.3	)	Discounted fair value	Forward price curve	Apr-16 through Jun-17	$0.083 per metric ton to $0.084 per metric ton

Reconciliation of activity for financial instruments classified as Level 3

The following table presents a reconciliation of activity for the Midwest premium derivative contracts on a net basis (in millions of dollars):

	Level 3
Fair value measurement at December 31, 2015	$	0.6
Total realized/unrealized (loss) included in:
Cost of goods sold excluding depreciation and amortization and other items and Unrealized loss on derivative instruments	—
Transactions involving Level 3 derivative contracts:
Purchases	(0.1		)
Sales	—
Issuances	—
Settlements	(0.3		)
Transactions involving Level 3 derivatives – net	(0.4		)
Transfers in and/or out of Level 3 valuation hierarchy	—
Fair value measurement at March 31, 2016	$	0.2
Total gain included in Unrealized (gain) loss on derivative instruments, attributable to the change in unrealized gain/loss relating to derivative contracts held at March 31, 2016:	$	(0.1	)

XML

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Calculation of basic and diluted earnings per share

Basic and diluted net income (loss) per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):

	Quarter Ended
	March 31,
	2016		2015
Numerator:
Net income (loss)	$	26.3	$	(292.2	)
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	17,864		17,344
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	336		—
Diluted2	18,200		17,344
Net income (loss) per common share, Basic:	$	1.47	$	(16.85	)
Net income (loss) per common share, Diluted:	$	1.44	$	(16.85	)

______________________

¹  The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.

²  The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following securities were excluded from the weighted-average diluted shares computation for the quarters ended March 31, 2016 and March 31, 2015 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended
	March 31,
	2016	2015
Options to purchase common shares	17	17
Non-vested common shares, restricted stock units and performance shares	33	187
Warrants1	—	636
Total excluded	50	840

______________________

¹  Net-share-settled warrants ("Warrants") relating to approximately 3.7 million notional common shares of our common stock were outstanding at March 31, 2015 at an exercise price of approximately $60.57 per share, and were settled during a period from July 1, 2015 through December 18, 2015.

XML

Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Summary of financial information by operating segment

	Quarter Ended
	March 31,
	2016			2015
Net sales:
Fabricated Products	$	343.2		$	371.7
Segment operating income (loss):
Fabricated Products1	$	57.9		$	44.9
All Other2	(13.1		)	(503.5		)
Total operating income (loss)	$	44.8		$	(458.6	)
Interest expense	(3.7		)	(9.8		)
Other income, net	0.3			0.4
Income (loss) before income taxes	$	41.4		$	(468.0	)
Depreciation and amortization:
Fabricated Products	$	8.6		$	7.9
All Other	0.1			0.1
Total depreciation and amortization	$	8.7		$	8.0
Capital expenditures:
Fabricated Products	$	25.8		$	11.2
All Other	0.1			0.1
Total capital expenditures	$	25.9		$	11.3

_____________________

¹  Fabricated Products segment operating income included non-cash mark-to-market gain (loss) on primary aluminum, natural gas, electricity and foreign currency hedging activities, which totaled $4.0 million and $(4.5) million for the quarters ended March 31, 2016 and March 31, 2015, respectively. For further discussion regarding mark-to-market matters, see Note 8.

²  Operating loss in All Other included Net periodic postretirement benefit cost of $0.8 million and $0.6 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. Additionally, operating loss in All Other included (gain) loss on removal of Union VEBA net assets of $(0.1) million and $492.2 million for the quarters ended March 31, 2016 and March 31, 2015, respectively. See Note 5 for further details.

	March 31, 2016		December 31, 2015
Assets:
Fabricated Products	$	932.5	$	904.7
All Other1	304.1		342.9
Total assets	$	1,236.6	$	1,247.6

_____________________

¹  Assets in All Other represent primarily all of our cash and cash equivalents, short-term investments, financial derivative assets (see Note 9) and net deferred income tax assets.

Schedule of net sales by end market segment applications

Net sales by product categories based on end market applications for the Fabricated Products segment were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Net sales:
Aero/HS products	$	176.9	$	180.3
Automotive Extrusions	48.4		50.1
GE products	105.4		119.1
Other products	12.5		22.2
Total net sales	$	343.2	$	371.7

Schedule of income taxes paid by geographical area

Geographic information for income taxes paid were as follows (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Income taxes paid:
Fabricated Products –
United States	$	0.1	$	0.1
Canada	0.2		0.9
Total income taxes paid	$	0.3	$	1.0

Schedule of information for contractual delivery of primary aluminum supply from major suppliers

Information for delivery of our primary aluminum supply from our major suppliers were as follows:

	Quarter Ended
	March 31,
	2016		2015
Percentage of total primary aluminum supply (lbs):
Supply from the Company's top five major suppliers	83	%	75	%
Supply from the Company's largest supplier	30	%	29	%
Supply from the Company's second and third largest suppliers	35	%	29	%

XML

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three Months Ended
	March 31,
	2016		2015
	(In millions of dollars)
Interest paid	$	0.3	$	0.1
Non-cash investing and financing activities:
Stock repurchases not yet settled (accrued in accounts payable)	$	0.1	$	1.8
Unpaid purchases of property and equipment	$	2.0	$	1.3

XML

Other Income (Expense), Net (Tables)

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Other Income (Expense), Net

Other income, net consisted of the following for each period presented (in millions of dollars):

	Quarter Ended
	March 31,
	2016		2015
Interest income	$	0.1	$	0.2
Realized gain on investments	—		0.3
All other income (expense), net	0.2		(0.1		)
Other income, net	$	0.3	$	0.4

XML

Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2016

Statement of Comprehensive Income [Abstract]

Other Comprehensive Income

The following table presents the tax effect allocated to each component of other comprehensive income for each period presented (in millions of dollars):

	Before-Tax		Income Tax			Net-of-Tax
	Amount		(Expense) Benefit3			Amount
Quarter Ended March 31, 2016
Salaried VEBA:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.1	$	—		$	0.1
Amortization of prior service cost1	1.0		(0.4		)	0.6
Other comprehensive income relating to Salaried VEBA	1.1		(0.4		)	0.7
Foreign currency translation gain on Canadian pension plan	0.1		—			0.1
Unrealized gain on foreign currency cash flow hedges	0.2		(0.1		)	0.1
Other comprehensive income	$	1.4	$	(0.5	)	$	0.9
Quarter Ended March 31, 2015
VEBAs:
Reclassification adjustments:
Amortization of net actuarial loss1	$	0.3	$	(0.1	)	$	0.2
Amortization of prior service cost1	0.7		(0.3		)	0.4
Removal of obligation relating to Union VEBA	106.6		(40.4		)	66.2
Other comprehensive income relating to VEBAs	107.6		(40.8		)	66.8
Available for sale securities:
Reclassification of unrealized loss upon sale of available for sale securities2	0.1		(0.1		)	—
Other comprehensive income relating to available for sale securities	0.1		(0.1		)	—
Foreign currency translation gain	0.1		—			0.1
Other comprehensive income	$	107.8	$	(40.9	)	$	66.9

________________

¹  Amounts reclassified out of Accumulated other comprehensive loss relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to the Salaried VEBA.

²  Amounts reclassified out of Accumulated other comprehensive loss relating to sales of available for sale securities were included as a component of Other (expense) income, net. We use the specific identification method to determine the amount reclassified out of Accumulated other comprehensive loss.

³  Income tax amounts reclassified out of Accumulated other comprehensive loss were included as a component of Income tax (provision) benefit.

XML

Guarantor and Non-Guarantor Financial Statements (Tables)

3 Months Ended

Mar. 31, 2016

Guarantor and Non-Guarantor Financial Statement [Abstract]

Schedule of Condensed Financial Statements

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

March 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	69.1	$	1.6	$	—		$	70.7
Short-term investments	—		10.0		—		—			10.0
Receivables:
Trade receivables – net	—		134.0		4.8		—			138.8
Intercompany receivables	93.6		23.1		1.3		(118.0		)	—
Other	—		5.9		2.7		—			8.6
Inventories	—		208.3		5.8		(3.5		)	210.6
Prepaid expenses and other current assets	0.1		8.5		0.8		(0.3		)	9.1
Total current assets	93.7		458.9		17.0		(121.8		)	447.8
Investments in and advances to subsidiaries	912.8		32.0		—		(944.8		)	—
Property, plant and equipment – net	—		473.1		31.4		—			504.5
Long-term intercompany receivables	—		—		3.9		(3.9		)	—
Deferred tax assets – net	—		190.5		—		7.0			197.5
Intangible assets – net	—		30.1		—		—			30.1
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.4		0.1		—			19.5
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.6	$	64.6	$	5.0	$	—		$	70.2
Intercompany payable	17.9		99.3		4.5		(121.7		)	—
Accrued salaries, wages and related expenses	—		32.4		1.5		—			33.9
Other accrued liabilities	5.4		51.3		0.2		(0.4		)	56.5
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	23.9		247.7		11.2		(122.1		)	160.7
Net liabilities of Salaried VEBA	—		18.7		—		—			18.7
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.9		—		(3.9		)	—
Long-term liabilities	—		66.2		6.3		—			72.5
Long-term debt	194.8		—		—		—			194.8
Total liabilities	218.7		336.5		19.6		(126.0		)	448.8
Total stockholders' equity	787.8		904.7		32.8		(937.5		)	787.8
Total	$	1,006.5	$	1,241.2	$	52.4	$	(1,063.5	)	$	1,236.6

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2015

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	72.2	$	0.3	$	—		$	72.5
Short-term investments	—		30.0		—		—			30.0
Receivables:
Trade receivables – net	—		114.0		2.7		—			116.7
Intercompany receivables	—		111.2		1.1		(112.3		)	—
Other	—		3.8		2.3		—			6.1
Inventories	—		216.3		6.6		(3.3		)	219.6
Prepaid expenses and other current assets	0.2		56.2		1.7		(1.4		)	56.7
Total current assets	0.2		603.7		14.7		(117.0		)	501.6
Investments in and advances to subsidiaries	1,077.2		31.4		—		(1,108.6		)	—
Property, plant and equipment – net	—		464.3		31.1		—			495.4
Long-term intercompany receivables	—		—		3.1		(3.1		)	—
Deferred tax assets – net	—		156.3		—		7.0			163.3
Intangible assets – net	—		30.5		—		—			30.5
Goodwill	—		37.2		—		—			37.2
Other assets	—		19.5		0.1		—			19.6
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	0.5	$	73.6	$	2.6	$	—		$	76.7
Intercompany payable	106.5		14.8		4.0		(125.3		)	—
Accrued salaries, wages and related expenses	—		38.3		1.5		—			39.8
Other accrued liabilities	1.4		52.3		0.4		(1.4		)	52.7
Short-term capital leases	—		0.1		—		—			0.1
Total current liabilities	108.4		179.1		8.5		(126.7		)	169.3
Net liabilities of Salaried VEBA	—		19.0		—		—			19.0
Deferred tax liabilities	—		—		2.1		—			2.1
Long-term intercompany payable	—		3.1		—		(3.1		)	—
Long-term liabilities	—		81.3		6.2		—			87.5
Long-term debt	194.6		—		—		—			194.6
Total liabilities	303.0		282.5		16.8		(129.8		)	472.5
Total stockholders' equity	774.4		1,060.4		32.2		(1,091.9		)	775.1
Total	$	1,077.4	$	1,342.9	$	49.0	$	(1,221.7	)	$	1,247.6

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)

(In millions of dollars)

Quarter Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	335.7		$	26.4		$	(18.9	)	$	343.2
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			257.1			23.1			(18.2		)	262.0
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(4.0		)	—			—			(4.0		)
Depreciation and amortization	—			8.2			0.5			—			8.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.8			23.6			2.2			(0.5		)	26.1
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	0.8			24.3			2.2			(0.5		)	26.8
Total costs and expenses	0.8			290.5			25.8			(18.7		)	298.4
Operating (loss) income	(0.8		)	45.2			0.6			(0.2		)	44.8
Other (expense) income:
Interest expense	(4.3		)	0.6			—			—			(3.7		)
Other (expense) income, net	—			0.3			—			—			0.3
Income (loss) before income taxes	(5.1		)	46.1			0.6			(0.2		)	41.4
Income tax (provision) benefit	—			(16.9		)	(0.2		)	2.0			(15.1		)
Earnings (loss) in equity of subsidiaries	31.4			0.3			—			(31.7		)	—
Net income (loss)	$	26.3		$	29.5		$	0.4		$	(29.9	)	$	26.3
Comprehensive income	$	27.2		$	30.3		$	0.5		$	(30.8	)	$	27.2

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE (LOSS) INCOME

(In millions of dollars)

Quarter Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
Net sales	$	—		$	363.4		$	34.7	$	(26.4	)	$	371.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			296.4			31.6		(25.7		)	302.3
Unrealized loss on derivative instruments	—			4.5			—		—			4.5
Depreciation and amortization	—			7.7			0.3		—			8.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			20.7			1.6		(0.6		)	22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.6			—		—			0.6
Loss on removal of Union VEBA net assets	—			492.2			—		—			492.2
Total selling, general, administrative, research and development	1.0			513.5			1.6		(0.6		)	515.5
Total costs and expenses	1.0			822.1			33.5		(26.3		)	830.3
Operating (loss) income	(1.0		)	(458.7		)	1.2		(0.1		)	(458.6		)
Other (expense) income:
Interest expense	(9.5		)	(0.5		)	—		0.2			(9.8		)
Other (expense) income, net	—			0.5			0.1		(0.2		)	0.4
(Loss) income before income taxes	(10.5		)	(458.7		)	1.3		(0.1		)	(468.0		)
Income tax benefit	—			171.9			—		3.9			175.8
(Loss) earnings in equity of subsidiaries	(281.7		)	1.1			—		280.6			—
Net (loss) income	$	(292.2	)	$	(285.7	)	$	1.3	$	284.4		$	(292.2	)
Comprehensive (loss) income	$	(225.3	)	$	(218.9	)	$	1.4	$	217.5		$	(225.3	)

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash provided by operating activities1	$	17.2		$	201.4		$	2.7		$	(200.0	)	$	21.3
Cash flows from investing activities:
Capital expenditures	—			(25.3		)	(0.6		)	—			(25.9		)
Proceeds from disposition of available for sale securities	—			20.0			—			—			20.0
Net cash used in investing activities	—			(5.3		)	(0.6		)	—			(5.9		)
Cash flows from financing activities:
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.7		)	—			—			—			(2.7		)
Repurchase of common stock	(6.3		)	—			—			—			(6.3		)
Cash dividends paid to stockholders	(8.2		)	—			—			—			(8.2		)
Cash dividends paid to Parent	—			(200.0		)	—			200.0			—
Intercompany loan	—			0.8			(0.8		)	—			—
Net cash (used in) provided by financing activities	(17.2		)	(199.2		)	(0.8		)	200.0			(17.2		)
Net (decrease) increase in cash and cash equivalents during the period	—			(3.1		)	1.3			—			(1.8		)
Cash and cash equivalents at beginning of period	—			72.2			0.3			—			72.5
Cash and cash equivalents at end of period	$	—		$	69.1		$	1.6		$	—		$	70.7

________________

¹  The Guarantor Subsidiaries’ Net cash provided by operating activities reflects a decrease in current Intercompany receivables from the Parent and an increase in current Intercompany payable to the Parent related to the $200.0 million dividend made by the Guarantor Subsidiaries to the Parent.  The dividend to the Parent and intercompany activity is eliminated within the consolidating adjustments.

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Three Months Ended March 31, 2015

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$	37.8		$	(32.7	)	$	2.3		$	—	$	7.4
Cash flows from investing activities:
Capital expenditures	—			(6.7		)	(4.6		)	—		(11.3		)
Proceeds from disposition of available for sale securities	—			84.0			—			—		84.0
Net cash provided by (used in) investing activities	—			77.3			(4.6		)	—		72.7
Cash flows from financing activities:
Payment of capital lease liability	—			(0.1		)	—			—		(0.1		)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	—			1.0			—			—		1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.5		)	—			—			—		(2.5		)
Repurchase of common stock	(28.2		)	—			—			—		(28.2		)
Cash dividend paid to stockholders	(7.1		)	—			—			—		(7.1		)
Intercompany loan	—			(1.9		)	1.9			—		—
Net cash (used in) provided by financing activities	(37.8		)	(1.0		)	1.9			—		(36.9		)
Net increase (decrease) in cash and cash equivalents during the period	—			43.6			(0.4		)	—		43.2
Cash and cash equivalents at beginning of period	—			175.3			2.4			—		177.7
Cash and cash equivalents at end of period	$	—		$	218.9		$	2.0		$	—	$	220.9

XML

Summary of Significant Accounting Policies, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Significant accounting policies
Reclassification of deferred financing costs upon adoption of ASU 2015-03	$ 3.2
Inventory Write-down	4.9	$ 0.0
Fabricated Products
Significant accounting policies
(Shortfalls) excess of current cost over the stated LIFO value of inventory	$ 17.7		$ 24.1

XML

Summary of Significant Accounting Policies, Narrative, Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment
Interest expense capitalized as construction in progress	$ 0.9	$ 0.3
Depreciation expense	8.3	7.6
Fabricated Products
Property, Plant and Equipment
Depreciation expense	$ 8.2	$ 7.5

XML

Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents
Cash and money market funds		$ 34.5	$ 40.3
Commercial paper		36.2	32.2
Total		70.7	72.5
Trade Receivables – Net
Trade receivables, gross		139.6	117.5
Allowance for doubtful receivables		(0.8)	(0.8)
Trade receivables – net		138.8	116.7
Inventories
Finished products		66.8	79.5
Work-in-process		73.4	63.6
Raw materials		46.7	53.4
Operating supplies and repair and maintenance parts		23.7	23.1
Total		210.6	219.6
Prepaid Expenses and Other Current Assets
Current derivative assets – Notes 8 and 9		1.4	1.5
Current deferred tax assets		0.0	49.6
Short-term restricted cash		0.3	0.3
Prepaid taxes		3.3	0.0
Prepaid Insurance		1.1	1.9
Other		3.0	3.4
Total	[1]	9.1	56.7
Property, Plant and Equipment – Net
Land and improvements		22.7	22.7
Buildings and leasehold improvements		72.5	71.8
Machinery and equipment		559.3	549.0
Construction in progress		54.8	48.5
Property, plant and equipment – gross		709.3	692.0
Accumulated depreciation		(205.1)	(196.9)
Assets held for sale		0.3	0.3
Property, plant and equipment – net		504.5	495.4
Other Assets
Restricted cash		10.9	10.9
Deferred financing costs		1.1	1.3
Deferred compensation plan assets		7.3	7.3
Derivative Asset, Noncurrent		0.2	0.1
Total	[1]	19.5	19.6
Other Accrued Liabilities
Current derivative liabilities – Notes 8 and 9		10.3	14.1
Uncleared cash disbursements		10.0	8.0
Accrued income taxes and taxes payable		8.6	3.1
Accrued annual contribution to VEBAs		0.0	19.6
Accrued contingent contribution to Union VEBA – Note 5		17.1	0.0
Short-term environmental accrual – Note 7		1.3	1.6
Accrued interest		5.5	1.5
Short-term deferred revenue		0.8	1.2
Other		2.9	3.6
Total		56.5	52.7
Long-Term Liabilities
Derivative liabilities – Notes 8 and 9		1.7	2.1
Income tax liabilities		0.8	0.7
Workers’ compensation accruals		24.1	21.7
Long-term environmental accruals – Note 7		16.8	17.0
Long-term asset retirement obligations		4.9	4.8
Deferred compensation liabilities		7.8	7.7
Long-term deferred revenue		0.3	0.3
Long-term capital leases		0.1	0.1
Long-term portion of contingent contribution to Union VEBA – Note 5		12.8	29.9
Other long-term liabilities		3.2	3.2
Total		72.5	87.5
Billed
Trade Receivables – Net
Trade receivables, gross		139.4	116.8
Unbilled
Trade Receivables – Net
Trade receivables, gross		$ 0.2	$ 0.7

[1] See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

XML

Debt and Credit Facility Debt and Credit Facility, Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	May. 23, 2012
Debt Instrument [Line Items]
Long-term debt1	[1]	$ 194,800,000		$ 194,600,000
Senior Notes Due 2020 [Member] | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 225,000,000
Debt Instrument, Interest Rate, Stated Percentage					8.25%
Debt issuance, percentage of principal amount					100.00%
Debt Instrument, Periodic Payment, Principal				$ 27,200,000
Percentage of principal amount repurchased				107.50%
Long-term debt1		197,800,000		$ 197,800,000
Interest Expense, Long-term Debt		4,300,000	$ 4,800,000
Debt Instrument, Fair Value Disclosure		205,700,000		$ 207,300,000
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000
Line of Credit Facility, Current Borrowing Capacity		299,100,000
Long-term Line of Credit		0
Line of Credit Facility, Remaining Borrowing Capacity		$ 291,800,000
Line of Credit Facility, Interest Rate at Period End		3.75%
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Long-term Line of Credit		$ 7,300,000
On or after June 1, 2016 [Member] | Senior Notes Due 2020 [Member] | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		104.125%
On or after June 1, 2017 [Member] | Senior Notes Due 2020 [Member] | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.0625%
On or after June 1, 2018 [Member] | Senior Notes Due 2020 [Member] | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%

[1] See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

XML

Income Tax Matters, Provision Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Tax Provision
Domestic	$ 14.9	$ (175.8)
Foreign	0.2	0.0
Total	$ 15.1	$ (175.8)

XML

Income Tax Matters, Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Contingency
Income tax provision (benefit)		$ 15.1	$ (175.8)
Effective tax rate		36.50%	37.60%
Effective income tax rate reconciliation, share-based compensation cost, amount		$ 0.7
Effective income tax rate reconciliation, share-based compensation cost, percent		(1.70%)
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount		$ 0.3
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent		0.70%
Gross unrecognized tax benefits		$ 1.7		$ 1.7
Gross unrecognized tax benefits that would impact effective tax rate		0.6		0.6
Cumulative-effect adjustment	[1]			0.7
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
Income Tax Contingency
Cumulative-effect adjustment	[1]			$ 0.7
Union VEBA
Income Tax Contingency
Income tax benefit on removal of Union VEBA net assets		$ 184.4	$ 184.4

[1] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

XML

Employee Benefits, Net Periodic Benefit Costs and Charges Relating To All Other Employee Benefit Plans(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Salaried VEBA:
Total net periodic postretirement benefit cost relating to Salaried VEBA	$ 0.8	$ 0.6
(Gain) loss on removal of Union VEBA net assets	(0.1)	492.2
Deferred Compensation Arrangement with Individual, Compensation Expense	0.1	0.4
Defined contribution plans	4.0	4.0
Multiemployer pension plans	1.1	0.9
Charges Relating To Other Benefit Plans	5.2	5.3
Total other employee benefit plans	5.9	498.1
Fabricated Products
Salaried VEBA:
Total other employee benefit plans	4.7	4.6
All Other
Salaried VEBA:
Total other employee benefit plans	1.2	493.5
VEBAs
Salaried VEBA:
Service cost1	0.0	0.0
Interest cost	0.7	0.7
Expected return on plan assets	(1.0)	(1.1)
Amortization of prior service cost	1.0	0.7
Amortization of net actuarial loss	0.1	0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	$ (0.1)	$ 492.2

XML

Employee Benefits, Defined Benefit Plans Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	$ 0.0		$ 19.6
VEBAs
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs			19.5
Union VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs			16.7
Accrued Veba contingent contribution - total	29.9
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments		$ 307.8
Income Tax Expense (Benefit)	$ 184.4	$ 184.4
Salaried VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs			$ 2.8

XML

Employee Incentive Plans, Short Term Incentive Plans (Details) $ in Millions	Mar. 31, 2016 USD ($)
Short Term Incentive Plans [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Accrued Bonuses	$ 4.9

XML

Employee Incentive Plans Employee Incentive Plans, Compensation expense under LTI programs (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative-effect adjustment	[1]			$ 0.7
Allocated Share-based Compensation Expense		$ 2.6	$ 2.1
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		1.1	1.1
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		0.3	0.4
Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		1.1	0.6
Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		0.1	0.0
Fabricated Products
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		0.8	0.7
All Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		$ 1.8	$ 1.4
Minimum | Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		0.00%
Minimum | Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		0.00%
Maximum | Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		200.00%
Maximum | Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		200.00%
Additional Paid in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative-effect adjustment	[1]			0.8
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative-effect adjustment	[1]			0.7
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect | Additional Paid in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative-effect adjustment	[1]			$ 0.8

[1] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

XML

Employee Incentive Plans Employee Incentive Plans, Unrecognized Compensation Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 8.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 4 months
Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 4.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 11 months
Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 10.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months

XML

Employee Incentive Plans Employee Incentive Plans, Summary of activity of non-vested common shares, restricted stock units, and performance shares (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	0
Share Based Compensation Arrangement By Share Based Payments Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	38,812
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 60.75
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.00	$ 69.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 69.33		$ 67.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	117,569		156,553
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	172
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 68.99
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	0
Share Based Compensation Arrangement By Share Based Payments Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	1,762
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 63.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 74.49	69.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	52,705
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 74.07		$ 66.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	56,299		5,521
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	165
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 74
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	105,494
Share Based Compensation Arrangement By Share Based Payments Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value	$ 57.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	49,611
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 57.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 0.00		$ 57.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0		155,105
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0.00
Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	0
Share Based Compensation Arrangement By Share Based Payments Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 80.46	0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	63,983
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 80.46		$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	63,819		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	164
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 80.46
Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	0
Share Based Compensation Arrangement By Share Based Payments Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 93.02	$ 95.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	95,974
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 90.30		$ 89.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	394,736		299,877
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	1,115
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 90.06

XML

Employee Incentive Plans Employee Incentive Plans, Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.00	$ 69.83
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	74.49	69.83
Cost Performance-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	80.46	0.00
Market-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 93.02	$ 95.68

XML

Employee Incentive Plans Employee Incentive Plans, Narrative (Details) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	16,645		16,645
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,722,222
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	603,810
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 80.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year		1 year 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Shares Paid for Tax Withholding for Share Based Compensation	35,162	33,628
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Common Share Received By Employee On Vesting Of Restricted Stock Unit	1
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Market-based shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Market-based shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%

XML

Commitments and Contingencies, Environmental (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Environmental Contingency
Environmental accrual	$ 18.1
Expected period related to remediation expenditures for environmental contingencies period	30 years
Potential increase in environmental costs	$ 24.7
Time period within which Companys recorded estimate of its obligation may change	12 months
Minimum
Environmental Contingency
Period for final feasibility study	9 months
Maximum
Environmental Contingency
Period for final feasibility study	15 months

XML

Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	$ 4.0	$ (4.5)
Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	4.0	(4.5)
Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	(4.4)	(4.7)
Unrealized gains (losses)	4.0	(4.5)
Foreign Currency Member | Operational Risk Hedges | Designated as Hedging Instrument [Member]
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	0.2	0.0
Aluminum | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	(2.7)	(2.7)
Unrealized gains (losses)	3.2	(4.2)
Natural Gas | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	(1.7)	(1.3)
Unrealized gains (losses)	0.8	(0.7)
Electricity | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	0.0	(0.7)
Unrealized gains (losses)	0.0	0.4
Hedges Relating To Notes Member | Call Options | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	0.0	10.2
Hedges Relating To Notes Member | Bifurcated Conversion Feature | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	$ 0.0	$ (10.2)

XML

Derivative Financial Instruments and Related Hedging Programs, Material Derivative Positions (Details)	Mar. 31, 2016 EUR (€) MMBTU mmlbs	Dec. 31, 2015 EUR (€)
Remainder of 2016
Derivative [Line Items]
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced	79.00%
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced	54.00%
2017
Derivative [Line Items]
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced	73.00%
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced	54.00%
2018
Derivative [Line Items]
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced	72.00%
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced	27.00%
Not Designated as Hedging Instrument | Aluminum | Option on Securities [Member] | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	2.0
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	128.4
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Sales
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	2.2
Not Designated as Hedging Instrument | Aluminum | Midwest premium swap contracts | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	92.0
Not Designated as Hedging Instrument | Natural Gas | Fixed priced contracts | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU	7,070,000
Designated as Hedging Instrument [Member] | Foreign Currency Member | Fixed priced contracts | Purchase
Derivative [Line Items]
Notional amount of contracts | €	€ 3,950,374	€ 4,699,750

XML

Derivative Financial Instruments and Related Hedging Programs, Offsetting of Derivative Instruments by Counterparty (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets and Collateral Held by Counterparty
Gross Amounts of Recognized Assets	$ 1.6	$ 1.6
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	1.6	1.6
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.6	1.6
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received	0.0	0.0
Net Amount	0.0	0.0
Derivative Liabilities and Collateral Held by Counterparty
Gross Amounts of Recognized Liabilities	(12.0)	(16.2)
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(12.0)	(16.2)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.6)	(1.6)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged	0.0	0.0
Net Amount	(10.4)	(14.6)
Counterparty (with Netting Agreements)
Derivative Assets and Collateral Held by Counterparty
Gross Amounts of Recognized Assets	1.0	1.3
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	1.0	1.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.0	1.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received	0.0	0.0
Net Amount	0.0	0.0
Derivative Liabilities and Collateral Held by Counterparty
Gross Amounts of Recognized Liabilities	(6.3)	(8.5)
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(6.3)	(8.5)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.0)	(1.3)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged	0.0	0.0
Net Amount	(5.3)	(7.2)
Counterparty (with partial Netting Agreements)
Derivative Assets and Collateral Held by Counterparty
Gross Amounts of Recognized Assets	0.6	0.3
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	0.6	0.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	0.6	0.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received	0.0	0.0
Net Amount	0.0	0.0
Derivative Liabilities and Collateral Held by Counterparty
Gross Amounts of Recognized Liabilities	(5.7)	(7.7)
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(5.7)	(7.7)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(0.6)	(0.3)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged	0.0	0.0
Net Amount	$ (5.1)	$ (7.4)

XML

Derivative Financial Instruments and Related Hedging Programs, Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2016 EUR (€)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 0.0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	0.0
Unrealized gain on foreign currency cash flow hedges	0.2	$ 0.0
Accumulated other comprehensive loss related to cash flow hedges				$ (0.1)
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness	$ 0.0
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract]
Aggregate fair value of derivative instruments that contain credit-risk-related contingency features that were in a net liability position				$ 10.4		$ 14.6
2017
Derivative [Line Items]
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced			54.00%	54.00%
Remainder of 2016
Derivative [Line Items]
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced			54.00%	54.00%
2018
Derivative [Line Items]
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced			27.00%	27.00%
Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase
Derivative [Line Items]
Derivative Liability, Notional Amount | €			€ 3,950,374		€ 4,699,750
Derivative, Average Forward Exchange Rate			1.14	1.14	1.14	1.14
Minimum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase
Derivative [Line Items]
Derivative, Remaining Maturity	2 months
Maximum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase
Derivative [Line Items]
Derivative, Remaining Maturity	17 months

XML

Fair Value Measurements, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Financial Assets:
Derivative Asset	$ 1.6	$ 1.6
Deferred compensation plan assets	7.3	7.3
Financial Liabilities:
Derivative Liability	(12.0)	(16.2)
Fair Value, Measurements, Recurring
Financial Assets:
Cash and cash equivalents	70.7	72.5
Deferred compensation plan assets	7.3	7.3
Total Assets	89.6	111.4
Financial Liabilities:
Total Liabilities	(217.7)	(223.5)
Fair Value, Measurements, Recurring | Senior Notes
Financial Liabilities:
Senior Notes	(205.7)	(207.3)
Fair Value, Measurements, Recurring | Debt securities
Financial Assets:
Short-term investments	10.0	30.0
Fair Value, Measurements, Recurring | Aluminum | Option on Securities [Member] | Purchase
Financial Assets:
Derivative Asset	0.2	0.2
Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.8	0.3
Financial Liabilities:
Derivative Liability		(8.9)
Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Sales
Financial Assets:
Derivative Asset		0.2
Financial Liabilities:
Derivative Liability		(0.1)
Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts
Financial Assets:
Derivative Asset	0.5	0.9
Fair Value, Measurements, Recurring | Natural Gas | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.1
Financial Liabilities:
Derivative Liability		(6.7)
Fair Value, Measurements, Recurring | Level 1
Financial Assets:
Cash and cash equivalents	34.5	40.3
Deferred compensation plan assets	0.0	0.0
Total Assets	34.5	40.3
Financial Liabilities:
Total Liabilities	(205.7)	(207.3)
Fair Value, Measurements, Recurring | Level 1 | Senior Notes
Financial Liabilities:
Senior Notes	(205.7)	(207.3)
Fair Value, Measurements, Recurring | Level 1 | Debt securities
Financial Assets:
Short-term investments	0.0	0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Option on Securities [Member] | Purchase
Financial Assets:
Derivative Asset	0.0	0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.0	0.0
Financial Liabilities:
Derivative Liability		0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Sales
Financial Assets:
Derivative Asset		0.0
Financial Liabilities:
Derivative Liability		0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts
Financial Assets:
Derivative Asset	0.0	0.0
Fair Value, Measurements, Recurring | Level 1 | Natural Gas | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.0
Financial Liabilities:
Derivative Liability		0.0
Fair Value, Measurements, Recurring | Level 2
Financial Assets:
Cash and cash equivalents	36.2	32.2
Short-term investments		30.0
Deferred compensation plan assets	7.3	7.3
Total Assets	54.6	70.2
Financial Liabilities:
Total Liabilities	(11.7)	(15.9)
Fair Value, Measurements, Recurring | Level 2 | Senior Notes
Financial Liabilities:
Senior Notes	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Debt securities
Financial Assets:
Short-term investments	10.0
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Option on Securities [Member] | Purchase
Financial Assets:
Derivative Asset	0.2	0.2
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.8	0.3
Financial Liabilities:
Derivative Liability		(8.9)
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Sales
Financial Assets:
Derivative Asset		0.2
Financial Liabilities:
Derivative Liability		(0.1)
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts
Financial Assets:
Derivative Asset	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.1
Financial Liabilities:
Derivative Liability		(6.7)
Fair Value, Measurements, Recurring | Level 3
Financial Assets:
Cash and cash equivalents	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Total Assets	0.5	0.9
Financial Liabilities:
Total Liabilities	(0.3)	(0.3)
Fair Value, Measurements, Recurring | Level 3 | Senior Notes
Financial Liabilities:
Senior Notes	0.0	0.0
Fair Value, Measurements, Recurring | Level 3 | Debt securities
Financial Assets:
Short-term investments	0.0	0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Option on Securities [Member] | Purchase
Financial Assets:
Derivative Asset	0.0	0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.0	0.0
Financial Liabilities:
Derivative Liability		0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Sales
Financial Assets:
Derivative Asset		0.0
Financial Liabilities:
Derivative Liability		0.0
Fair Value, Measurements, Recurring | Level 3 | Natural Gas | Fixed priced contracts | Purchase
Financial Assets:
Derivative Asset	0.0
Financial Liabilities:
Derivative Liability		0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	(5.6)
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability	(0.3)
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Natural Gas | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	(6.1)
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability	0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Natural Gas | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	(5.6)
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability	0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	(6.1)
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 3 | Natural Gas | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability	0.0
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Foreign Currency Member | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability		(0.2)
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Member | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability		0.0
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Member | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability		(0.2)
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Member | Fixed priced contracts | Purchase
Financial Liabilities:
Derivative Liability		0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability		(0.3)
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability		0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts
Financial Liabilities:
Derivative Liability		0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 3 | Aluminum | Midwest premium swap contracts
Financial Assets:
Derivative Asset	0.5	0.9
Financial Liabilities:
Derivative Liability	$ (0.3)	$ (0.3)

XML

Fair Value Measurements Fair Value Measurements, Schedule of Quantitative Information for Level 3 Derivative Contracts (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Midwest Premium Swap Asset Beginning Curve Value	$ 0.083
Midwest Premium Swap Asset Ending Curve Value	0.084
Midwest Premium Swap Liability Ending Curve Value	0.084
Midwest Premium Swap Liability Beginning Curve Value	$ 0.083

XML

Fair Value Measurements, Level 3 Fair Value Input Reconciliation Table (Details) - Derivative - Midwest premium swap contracts $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Reconciliation of activity for financial instruments classified as Level 3:
Fair value measurement at December 31, 2015	$ 0.6
Total realized/unrealized (loss) included in:
Cost of goods sold excluding depreciation and amortization and other items and Unrealized loss on derivative instruments	0.0
Transactions involving Level 3 derivative contracts:
Purchases	(0.1)
Sales	0.0
Issuances	0.0
Settlements	(0.3)
Transactions involving Level 3 derivatives – net	(0.4)
Transfers in and/or out of Level 3 valuation hierarchy	0.0
Fair value measurement at March 31, 2016	0.2
Total gain included in Unrealized (gain) loss on derivative instruments, attributable to the change in unrealized gain/loss relating to derivative contracts held at March 31, 2016:	$ (0.1)

XML

Fair Value Measurements Fair Value Measurements, Narrative (Details)	3 Months Ended
	Mar. 31, 2016
Maximum
Schedule of Available-for-sale Securities [Line Items]
Short-term investment maturity period	2 months

XML

Earnings Per Share, Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income	$ 26.3	$ (292.2)
Denominator — Weighted-average common shares outstanding (in thousands):
Basic	17,864	17,344
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	336	0
Diluted	18,200	17,344
Net income (loss) per common share:
Basic	$ 1.47	$ (16.85)
Earnings per common share, Diluted:
Diluted	$ 1.44	$ (16.85)

XML

Earnings Per Share, Anti Dilution Table (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	50	840
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 60.57
Options to purchase common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17	17
Non-vested common shares, restricted stock units and performance shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	33	187
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	636
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		3,700

XML

Earnings Per Share Earnings Per Share, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Payments of Ordinary Dividends, Common Stock	$ 8.2	$ 7.1
Common Stock, Dividends, Per Share, Cash Paid	$ 0.45	$ 0.40
Treasury Stock, Shares, Acquired	83,265	405,259
Treasury Stock Acquired, Average Cost Per Share	$ 76.85	$ 74.05
Treasury Stock, Value, Acquired, Cost Method	$ 6.4	$ 30.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 116.9

XML

Segment Information, Financial Information by Operating Segment Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Net sales:
Net Sales	$ 343.2	$ 371.7
Segment operating income (loss):
Operating income (loss)	44.8	(458.6)
Interest expense	(3.7)	(9.8)
Other (expense) income, net	0.3	0.4
Income (loss) before income taxes	41.4	(468.0)
Depreciation and amortization:
Depreciation and amortization	8.7	8.0
Capital expenditures:
Capital expenditures	25.9	11.3
Assets:
Assets	1,236.6		$ 1,247.6
Unrealized Gain (Loss) on Derivatives	4.0	(4.5)
Non-cash defined benefit net periodic benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	(0.1)	492.2
Fabricated Products
Net sales:
Net Sales	343.2	371.7
Segment operating income (loss):
Operating income (loss)	57.9	44.9
Depreciation and amortization:
Depreciation and amortization	8.6	7.9
Capital expenditures:
Capital expenditures	25.8	11.2
Assets:
Assets	932.5		904.7
Unrealized Gain (Loss) on Derivatives	4.0	(4.5)
All Other
Segment operating income (loss):
Operating income (loss)	(13.1)	(503.5)
Depreciation and amortization:
Depreciation and amortization	0.1	0.1
Capital expenditures:
Capital expenditures	0.1	0.1
Assets:
Assets	304.1		$ 342.9
VEBAs
Assets:
Non-cash defined benefit net periodic benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	$ (0.1)	$ 492.2

XML

Segment Information, Net Sales by End Market Segment Applications (Details) - Fabricated Products - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Sales:
Net sales	$ 343.2	$ 371.7
Aero/HS products
Net Sales:
Net sales	176.9	180.3
Automotive Extrusions
Net Sales:
Net sales	48.4	50.1
GE products
Net Sales:
Net sales	105.4	119.1
Other products
Net Sales:
Net sales	$ 12.5	$ 22.2

XML

Segment Information Segment Information, Income Taxes Paid by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information
Income Taxes Paid	$ 0.3	$ 1.0
UNITED STATES
Segment Reporting Information
Income Taxes Paid	0.1	0.1
Canada
Segment Reporting Information
Income Taxes Paid	$ 0.2	$ 0.9

XML

Segment Information, Supply Information (Details) - Supplier Concentration Risk - Aluminum	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Top five major suppliers
Concentration Risk
Concentration Risk, Percentage	83.00%	75.00%
Largest supplier
Concentration Risk
Concentration Risk, Percentage	30.00%	29.00%
Second and third largest suppliers
Concentration Risk
Concentration Risk, Percentage	35.00%	29.00%

XML

Segment Information, Narrative (Details) - productionfacilities	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information
Percentage of Employees Covered by Collective Bargaining Agreements	63.00%
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year	6.00%
United States
Segment Reporting Information
Number of production facilities	11
Canada
Segment Reporting Information
Number of production facilities	1
Customer Concentration Risk | Largest Customer | Sales Revenue, Net | Fabricated Products
Segment Reporting Information
Concentration Risk, Percentage	25.00%	23.00%
Customer Concentration Risk | Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage	19.00%
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | Fabricated Products
Segment Reporting Information
Concentration Risk, Percentage	10.00%	10.00%
Customer Concentration Risk | Second Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage	12.00%		17.00%

XML

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental disclosure of cash flow information:
Interest paid	$ 0.3	$ 0.1
Non-cash investing and financing activities:
Stock repurchases not yet settled (accrued in accounts payable)	0.1	1.8
Unpaid purchases of property and equipment	$ 2.0	$ 1.3

XML

Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Income and Expenses [Abstract]
Interest income	$ 0.1	$ 0.2
Realized gain on investments	0.0	0.3
All other income (expense), net	0.2	(0.1)
Other income, net	$ 0.3	$ 0.4

XML

Other Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Comprehensive Income (Loss), before Tax
Other Comprehensive Income (Loss), before Tax	$ 1.4	$ 107.8
Unrealized gain on foreign currency cash flow hedges	0.2	0.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Tax	(0.5)	(40.9)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Net of Tax	0.9	66.9
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Other Comprehensive Income (Loss), before Tax
Other Comprehensive Income (Loss), before Tax	1.1	107.6
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Tax	(0.4)	(40.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Net of Tax	0.7	66.8
Amortization of net actuarial loss1
Other Comprehensive Income (Loss), before Tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.1	0.3
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Reclassification from AOCI, Current Period, Tax	0.0	(0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.1	0.2
Amortization of prior service cost1
Other Comprehensive Income (Loss), before Tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1.0	0.7
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Reclassification from AOCI, Current Period, Tax	(0.4)	(0.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.6	0.4
Removal of obligation relating to Union VEBA
Other Comprehensive Income (Loss), before Tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		106.6
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Reclassification from AOCI, Current Period, Tax		(40.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		66.2
Reclassification of unrealized loss upon sale of available for sale securities2
Other Comprehensive Income (Loss), before Tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0.1
Other Comprehensive Income (Loss), before Tax		0.1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Reclassification from AOCI, Current Period, Tax		(0.1)
Other Comprehensive Income (Loss), Tax		(0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0.0
Other Comprehensive Income (Loss), Net of Tax		0.0
Foreign currency translation gain
Other Comprehensive Income (Loss), before Tax
Other Comprehensive Income (Loss), before Tax		0.1
Unrealized gain on foreign currency cash flow hedges	0.2
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Tax		0.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Net of Tax		$ 0.1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0.1
Foreign currency translation gain | Canadian Pension Plan
Other Comprehensive Income (Loss), before Tax
Canadian Pension foreign currency translation changes (before tax)	0.1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Canadian Pension foreign currency translation changes (tax)	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Canadian Pension foreign currency translation changes (net of tax)	$ 0.1

XML

Guarantor and Non-Guarantor Financial Statements, Balance Sheets (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents		$ 70.7	$ 72.5	$ 220.9	$ 177.7
Short-term investments		10.0	30.0
Receivables:
Trade receivables – net		138.8	116.7
Intercompany receivables		0.0	0.0
Other		8.6	6.1
Inventories		210.6	219.6
Prepaid expenses and other current assets1	[1]	9.1	56.7
Total current assets		447.8	501.6
Investments in and advances to subsidiaries		0.0	0.0
Property, plant and equipment – net		504.5	495.4
Long-term intercompany receivables		0.0	0.0
Deferred tax assets – net	[1],[2]	197.5	163.3
Intangible assets – net		30.1	30.5
Goodwill		37.2	37.2
Other assets1	[1]	19.5	19.6
Total		1,236.6	1,247.6
Current liabilities:
Accounts payable		70.2	76.7
Intercompany payable		0.0	0.0
Accrued salaries, wages and related expenses		33.9	39.8
Other accrued liabilities		56.5	52.7
Short-term capital leases		0.1	0.1
Total current liabilities		160.7	169.3
Net liabilities of Salaried VEBA		18.7	19.0
Deferred tax liabilities		2.1	2.1
Long-term intercompany payable		0.0	0.0
Long-term liabilities		72.5	87.5
Long-term debt1	[1]	194.8	194.6
Total liabilities		448.8	472.5
Total stockholders' equity		787.8	775.1
Total		1,236.6	1,247.6
Parent
Current assets:
Cash and cash equivalents		0.0	0.0	0.0	0.0
Short-term investments		0.0	0.0
Receivables:
Trade receivables – net		0.0	0.0
Intercompany receivables		93.6	0.0
Other		0.0	0.0
Inventories		0.0	0.0
Prepaid expenses and other current assets1		0.1	0.2
Total current assets		93.7	0.2
Investments in and advances to subsidiaries		912.8	1,077.2
Property, plant and equipment – net		0.0	0.0
Long-term intercompany receivables		0.0	0.0
Deferred tax assets – net		0.0	0.0
Intangible assets – net		0.0	0.0
Goodwill		0.0	0.0
Other assets1		0.0	0.0
Total		1,006.5	1,077.4
Current liabilities:
Accounts payable		0.6	0.5
Intercompany payable		17.9	106.5
Accrued salaries, wages and related expenses		0.0	0.0
Other accrued liabilities		5.4	1.4
Short-term capital leases		0.0	0.0
Total current liabilities		23.9	108.4
Net liabilities of Salaried VEBA		0.0	0.0
Deferred tax liabilities		0.0	0.0
Long-term intercompany payable		0.0	0.0
Long-term liabilities		0.0	0.0
Long-term debt1		194.8	194.6
Total liabilities		218.7	303.0
Total stockholders' equity		787.8	774.4
Total		1,006.5	1,077.4
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents		69.1	72.2	218.9	175.3
Short-term investments		10.0	30.0
Receivables:
Trade receivables – net		134.0	114.0
Intercompany receivables		23.1	111.2
Other		5.9	3.8
Inventories		208.3	216.3
Prepaid expenses and other current assets1		8.5	56.2
Total current assets		458.9	603.7
Investments in and advances to subsidiaries		32.0	31.4
Property, plant and equipment – net		473.1	464.3
Long-term intercompany receivables		0.0	0.0
Deferred tax assets – net		190.5	156.3
Intangible assets – net		30.1	30.5
Goodwill		37.2	37.2
Other assets1		19.4	19.5
Total		1,241.2	1,342.9
Current liabilities:
Accounts payable		64.6	73.6
Intercompany payable		99.3	14.8
Accrued salaries, wages and related expenses		32.4	38.3
Other accrued liabilities		51.3	52.3
Short-term capital leases		0.1	0.1
Total current liabilities		247.7	179.1
Net liabilities of Salaried VEBA		18.7	19.0
Deferred tax liabilities		0.0	0.0
Long-term intercompany payable		3.9	3.1
Long-term liabilities		66.2	81.3
Long-term debt1		0.0	0.0
Total liabilities		336.5	282.5
Total stockholders' equity		904.7	1,060.4
Total		1,241.2	1,342.9
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents		1.6	0.3	2.0	2.4
Short-term investments		0.0	0.0
Receivables:
Trade receivables – net		4.8	2.7
Intercompany receivables		1.3	1.1
Other		2.7	2.3
Inventories		5.8	6.6
Prepaid expenses and other current assets1		0.8	1.7
Total current assets		17.0	14.7
Investments in and advances to subsidiaries		0.0	0.0
Property, plant and equipment – net		31.4	31.1
Long-term intercompany receivables		3.9	3.1
Deferred tax assets – net		0.0	0.0
Intangible assets – net		0.0	0.0
Goodwill		0.0	0.0
Other assets1		0.1	0.1
Total		52.4	49.0
Current liabilities:
Accounts payable		5.0	2.6
Intercompany payable		4.5	4.0
Accrued salaries, wages and related expenses		1.5	1.5
Other accrued liabilities		0.2	0.4
Short-term capital leases		0.0	0.0
Total current liabilities		11.2	8.5
Net liabilities of Salaried VEBA		0.0	0.0
Deferred tax liabilities		2.1	2.1
Long-term intercompany payable		0.0	0.0
Long-term liabilities		6.3	6.2
Long-term debt1		0.0	0.0
Total liabilities		19.6	16.8
Total stockholders' equity		32.8	32.2
Total		52.4	49.0
Consolidating Adjustments
Current assets:
Cash and cash equivalents		0.0	0.0	$ 0.0	$ 0.0
Short-term investments		0.0	0.0
Receivables:
Trade receivables – net		0.0	0.0
Intercompany receivables		(118.0)	(112.3)
Other		0.0	0.0
Inventories		(3.5)	(3.3)
Prepaid expenses and other current assets1		(0.3)	(1.4)
Total current assets		(121.8)	(117.0)
Investments in and advances to subsidiaries		(944.8)	(1,108.6)
Property, plant and equipment – net		0.0	0.0
Long-term intercompany receivables		(3.9)	(3.1)
Deferred tax assets – net		7.0	7.0
Intangible assets – net		0.0	0.0
Goodwill		0.0	0.0
Other assets1		0.0	0.0
Total		(1,063.5)	(1,221.7)
Current liabilities:
Accounts payable		0.0	0.0
Intercompany payable		(121.7)	(125.3)
Accrued salaries, wages and related expenses		0.0	0.0
Other accrued liabilities		(0.4)	(1.4)
Short-term capital leases		0.0	0.0
Total current liabilities		(122.1)	(126.7)
Net liabilities of Salaried VEBA		0.0	0.0
Deferred tax liabilities		0.0	0.0
Long-term intercompany payable		(3.9)	(3.1)
Long-term liabilities		0.0	0.0
Long-term debt1		0.0	0.0
Total liabilities		(126.0)	(129.8)
Total stockholders' equity		(937.5)	(1,091.9)
Total		$ (1,063.5)	$ (1,221.7)

[1] See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

[2] See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

XML

Guarantor and Non-Guarantor Financial Statements, Comprehensive Income Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 343.2	$ 371.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	262.0	302.3
Inventory Write-down	4.9	0.0
Unrealized (gain) loss on derivative instruments	(4.0)	4.5
Depreciation and amortization	8.7	8.0
Selling, general, administrative, research and development	26.1	22.7
Net periodic postretirement benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	(0.1)	492.2
Total selling, general, administrative, research and development	26.8	515.5
Total costs and expenses	298.4	830.3
Operating (loss) income	44.8	(458.6)
Other (expense) income:
Interest expense	(3.7)	(9.8)
Other (expense) income, net	0.3	0.4
(Loss) income before income taxes	41.4	(468.0)
Income tax benefit	(15.1)	175.8
(Loss) earnings in equity of subsidiaries	0.0	0.0
Net (loss) income	26.3	(292.2)
Comprehensive (loss) income	27.2	(225.3)
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0.0	0.0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	0.0	0.0
Inventory Write-down	0.0
Unrealized (gain) loss on derivative instruments	0.0	0.0
Depreciation and amortization	0.0	0.0
Selling, general, administrative, research and development	0.8	1.0
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0
(Gain) loss on removal of Union VEBA net assets	0.0	0.0
Total selling, general, administrative, research and development	0.8	1.0
Total costs and expenses	0.8	1.0
Operating (loss) income	(0.8)	(1.0)
Other (expense) income:
Interest expense	(4.3)	(9.5)
Other (expense) income, net	0.0	0.0
(Loss) income before income taxes	(5.1)	(10.5)
Income tax benefit	0.0	0.0
(Loss) earnings in equity of subsidiaries	31.4	(281.7)
Net (loss) income	26.3	(292.2)
Comprehensive (loss) income	27.2	(225.3)
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	335.7	363.4
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	257.1	296.4
Inventory Write-down	4.9
Unrealized (gain) loss on derivative instruments	(4.0)	4.5
Depreciation and amortization	8.2	7.7
Selling, general, administrative, research and development	23.6	20.7
Net periodic postretirement benefit cost relating to Salaried VEBA	0.8	0.6
(Gain) loss on removal of Union VEBA net assets	(0.1)	492.2
Total selling, general, administrative, research and development	24.3	513.5
Total costs and expenses	290.5	822.1
Operating (loss) income	45.2	(458.7)
Other (expense) income:
Interest expense	0.6	(0.5)
Other (expense) income, net	0.3	0.5
(Loss) income before income taxes	46.1	(458.7)
Income tax benefit	(16.9)	171.9
(Loss) earnings in equity of subsidiaries	0.3	1.1
Net (loss) income	29.5	(285.7)
Comprehensive (loss) income	30.3	(218.9)
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	26.4	34.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	23.1	31.6
Inventory Write-down	0.0
Unrealized (gain) loss on derivative instruments	0.0	0.0
Depreciation and amortization	0.5	0.3
Selling, general, administrative, research and development	2.2	1.6
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0
(Gain) loss on removal of Union VEBA net assets	0.0	0.0
Total selling, general, administrative, research and development	2.2	1.6
Total costs and expenses	25.8	33.5
Operating (loss) income	0.6	1.2
Other (expense) income:
Interest expense	0.0	0.0
Other (expense) income, net	0.0	0.1
(Loss) income before income taxes	0.6	1.3
Income tax benefit	(0.2)	0.0
(Loss) earnings in equity of subsidiaries	0.0	0.0
Net (loss) income	0.4	1.3
Comprehensive (loss) income	0.5	1.4
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(18.9)	(26.4)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(18.2)	(25.7)
Inventory Write-down	0.0
Unrealized (gain) loss on derivative instruments	0.0	0.0
Depreciation and amortization	0.0	0.0
Selling, general, administrative, research and development	(0.5)	(0.6)
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0
(Gain) loss on removal of Union VEBA net assets	0.0	0.0
Total selling, general, administrative, research and development	(0.5)	(0.6)
Total costs and expenses	(18.7)	(26.3)
Operating (loss) income	(0.2)	(0.1)
Other (expense) income:
Interest expense	0.0	0.2
Other (expense) income, net	0.0	(0.2)
(Loss) income before income taxes	(0.2)	(0.1)
Income tax benefit	2.0	3.9
(Loss) earnings in equity of subsidiaries	(31.7)	280.6
Net (loss) income	(29.9)	284.4
Comprehensive (loss) income	$ (30.8)	$ 217.5

XML

Guarantor and Non-Guarantor Financial Statements, Cash Flow Statements (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net cash provided by operating activities1		$ 21.3	$ 7.4
Cash flows from investing activities3:
Capital expenditures		(25.9)	(11.3)
Proceeds from disposition of available for sale securities		20.0	84.0
Net cash used in investing activities	[1]	(5.9)	72.7
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations		0.0	(0.1)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest		0.0	1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(2.7)	(2.5)
Repurchase of common stock		(6.3)	(28.2)
Cash dividends paid to stockholders		(8.2)	(7.1)
Receipts of cash dividends from distribution of third party trust		0.0
Intercompany loan		0.0	0.0
Net cash used in financing activities	[1]	(17.2)	(36.9)
Net (decrease) increase in cash and cash equivalents during the period		(1.8)	43.2
Cash and cash equivalents at beginning of period		72.5	177.7
Cash and cash equivalents at end of period		70.7	220.9
Parent
Cash flows from operating activities:
Net cash provided by operating activities1		17.2	37.8
Cash flows from investing activities3:
Capital expenditures		0.0	0.0
Proceeds from disposition of available for sale securities		0.0	0.0
Net cash used in investing activities		0.0	0.0
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations			0.0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest			0.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(2.7)	(2.5)
Repurchase of common stock		(6.3)	(28.2)
Cash dividends paid to stockholders		(8.2)	(7.1)
Receipts of cash dividends from distribution of third party trust		0.0
Intercompany loan		0.0	0.0
Net cash used in financing activities		(17.2)	(37.8)
Net (decrease) increase in cash and cash equivalents during the period		0.0	0.0
Cash and cash equivalents at beginning of period		0.0	0.0
Cash and cash equivalents at end of period		0.0	0.0
Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by operating activities1		201.4	(32.7)
Cash flows from investing activities3:
Capital expenditures		(25.3)	(6.7)
Proceeds from disposition of available for sale securities		20.0	84.0
Net cash used in investing activities		(5.3)	77.3
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations			(0.1)
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest			1.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0.0	0.0
Repurchase of common stock		0.0	0.0
Cash dividends paid to stockholders		0.0	0.0
Receipts of cash dividends from distribution of third party trust		(200.0)
Intercompany loan		0.8	(1.9)
Net cash used in financing activities		(199.2)	(1.0)
Net (decrease) increase in cash and cash equivalents during the period		(3.1)	43.6
Cash and cash equivalents at beginning of period		72.2	175.3
Cash and cash equivalents at end of period		69.1	218.9
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by operating activities1		2.7	2.3
Cash flows from investing activities3:
Capital expenditures		(0.6)	(4.6)
Proceeds from disposition of available for sale securities		0.0	0.0
Net cash used in investing activities		(0.6)	(4.6)
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations			0.0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest			0.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0.0	0.0
Repurchase of common stock		0.0	0.0
Cash dividends paid to stockholders		0.0	0.0
Receipts of cash dividends from distribution of third party trust		0.0
Intercompany loan		(0.8)	1.9
Net cash used in financing activities		(0.8)	1.9
Net (decrease) increase in cash and cash equivalents during the period		1.3	(0.4)
Cash and cash equivalents at beginning of period		0.3	2.4
Cash and cash equivalents at end of period		1.6	2.0
Consolidating Adjustments
Cash flows from operating activities:
Net cash provided by operating activities1		(200.0)	0.0
Cash flows from investing activities3:
Capital expenditures		0.0	0.0
Proceeds from disposition of available for sale securities		0.0	0.0
Net cash used in investing activities		0.0	0.0
Cash flows from financing activities3:
Repayments of Long-term Capital Lease Obligations			0.0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest			0.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0.0	0.0
Repurchase of common stock		0.0	0.0
Cash dividends paid to stockholders		0.0	0.0
Receipts of cash dividends from distribution of third party trust		200.0
Intercompany loan		0.0	0.0
Net cash used in financing activities		200.0	0.0
Net (decrease) increase in cash and cash equivalents during the period		0.0	0.0
Cash and cash equivalents at beginning of period		0.0	0.0
Cash and cash equivalents at end of period		$ 0.0	$ 0.0

[1] See Note 12 for the supplemental disclosure on non-cash transactions.

XML

Guarantor and Non-Guarantor Financial Statements, Narrative (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions
Long-term debt1	[1]	$ 194.8	$ 194.6
Ownership interest by parent		100.00%

[1] See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

XML

Subsequent Events (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Apr. 22, 2016 $ / shares shares	Apr. 15, 2016 USD ($) $ / shares	Mar. 31, 2016 $ / shares shares	Mar. 31, 2015 $ / shares	Dec. 31, 2015 $ / shares shares
Subsequent Event [Line Items]
Common Stock, Par or Stated Value Per Share			$ 0.01		$ 0.01
Preferred Stock, Shares Authorized | shares			5,000,000		5,000,000
Common Stock, Dividends, Per Share, Declared			$ 0.45	$ 0.40
Subsequent Event
Subsequent Event [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Dividends, Per Share, Declared		$ 0.45
Cash dividends declared | $		$ 8.1
Series A Junior Participating Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred Stock, Rights Conversion Ratio into Preferred Stock	1
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized | shares	900,000
Preferred Stock, Redemption Price Per Share	$ 400.00
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Public Announcement	10 days
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Tender or Exchange Offer Results in Becoming an Acquiring Person	10 days