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 September 30, 2017

[ ] 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: 1-09447

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, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth 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
	Emerging growth company o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 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 October 16, 2017, there were 16,903,791 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	40
Item 3. Quantitative and Qualitative Disclosures About Market Risk	53
Item 4. Controls and Procedures	54
PART II
Item 1. Legal Proceedings	55
Item 1A. Risk Factors	55
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	55
Item 3. Defaults Upon Senior Securities	55
Item 4. Mine Safety Disclosures	56
Item 5. Other Information	56
Item 6. Exhibits	56
SIGNATURES	57

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

PART I – FINANCIAL INFORMATION

Item 1.Financial Statements

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

	September 30, 2017			December 31, 2016
	(In millions of dollars, except share and per share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	73.9		$	55.2
Short-term investments	191.4			231.0
Receivables:
Trade receivables, net	138.2			137.7
Other	15.4			11.9
Inventories	212.2			201.6
Prepaid expenses and other current assets	31.5			18.5
Total current assets	662.6			655.9
Property, plant and equipment, net	557.8			530.9
Deferred tax assets, net	118.7			159.7
Intangible assets, net	25.3			26.4
Goodwill	18.8			37.2
Other assets	39.5			33.4
Total	$	1,422.7		$	1,443.5
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	94.4		$	75.8
Accrued salaries, wages and related expenses	39.0			49.1
Other accrued liabilities	43.3			40.1
Total current liabilities	176.7			165.0
Net liabilities of Salaried VEBA	27.8			28.6
Deferred tax liabilities	3.3			3.3
Long-term liabilities	61.9			73.2
Long-term debt	369.4			368.7
Total liabilities	639.1			638.8
Commitments and contingencies – Note 8
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both September 30, 2017 and December 31, 2016; no shares were issued and outstanding at September 30, 2017 and December 31, 2016	—			—
Common stock, par value $0.01, 90,000,000 shares authorized at both September 30, 2017 and at December 31, 2016; 22,392,946 shares issued and 16,905,368 shares outstanding at September 30, 2017; 22,332,732 shares issued and 17,651,461 shares outstanding at December 31, 2016	0.2			0.2
Additional paid in capital	1,052.8			1,047.4
Retained earnings	109.0			75.2
Treasury stock, at cost, 5,487,578 shares at September 30, 2017 and 4,681,271 shares at December 31, 2016, respectively	(345.7		)	(281.4		)
Accumulated other comprehensive loss	(32.7		)	(36.7		)
Total stockholders' equity	783.6			804.7
Total	$	1,422.7		$	1,443.5

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

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED INCOME (UNAUDITED)

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
	(In millions of dollars, except share and per share amounts)
Net sales	$	332.8		$	320.6		$	1,044.4		$	998.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	267.2			254.7			822.7			767.1
Lower of cost or market inventory write-down	—			—			—			4.9
Unrealized gain on derivative instruments	(10.8		)	(2.0		)	(14.0		)	(16.9		)
Depreciation and amortization	10.2			9.0			29.3			26.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	24.7			25.6			74.7			79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2			0.8			3.4			2.5
Loss (gain) on removal of Union VEBA net assets – Note 6	0.5			—			(0.8		)	(0.1		)
Total selling, general, administrative, research and development	26.4			26.4			77.3			81.6
Goodwill impairment	—			—			18.4			—
Other operating charges, net	—			2.7			—			2.8
Total costs and expenses	293.0			290.8			933.7			866.2
Operating income	39.8			29.8			110.7			132.5
Other (expense) income:
Interest expense	(5.3		)	(5.5		)	(16.4		)	(14.7		)
Other income (expense), net – Note 13	1.5			—			3.1			(10.4		)
Income before income taxes	36.0			24.3			97.4			107.4
Income tax provision	(16.1		)	(9.4		)	(36.8		)	(40.2		)
Net income	$	19.9		$	14.9		$	60.6		$	67.2
Net income per common share:
Basic	$	1.18		$	0.84		$	3.55		$	3.76
Diluted	$	1.16		$	0.82		$	3.49		$	3.70
Weighted-average number of common shares outstanding (in thousands):
Basic	16,834			17,841			17,072			17,858
Diluted	17,160			18,175			17,363			18,181
Dividends declared per common share	$	0.50		$	0.45		$	1.50		$	1.35

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

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED)

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
	(In millions of dollars)
Net income	$	19.9	$	14.9	$	60.6	$	67.2
Other comprehensive income, net of tax – Note 14:
Salaried VEBA and defined benefit pension plan	0.8		0.7		2.5		2.2
Available for sale securities	0.3		0.3		0.6		0.6
Other	0.5		0.1		0.9		0.1
Other comprehensive income, net of tax	1.6		1.1		4.0		2.9
Comprehensive income	$	21.5	$	16.0	$	64.6	$	70.1

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

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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, 2016	17,651,461		$	0.2	$	1,047.4		$	75.2		$	(281.4	)	$	(36.7	)	$	804.7
Net income	—		—		—			60.6			—			—			60.6
Other comprehensive income, net of tax	—		—		—			—			—			4.0			4.0
Issuance of non-vested shares to non-employee directors	11,817		—		—			—			—			—			—
Issuance of common shares to non-employee directors	2,282		—		0.2			—			—			—			0.2
Issuance of common shares to employees upon vesting of restricted stock units and performance shares	102,737		—		—			—			—			—			—
Cancellation of employee non-vested shares	(427	)	—		—			—			—			—			—
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(56,195	)	—		(4.5		)	—			—			—			(4.5		)
Repurchase of common stock	(806,307	)	—		—			—			(64.9		)	—			(64.9		)
Cancellation of treasury stock	—		—		(0.2		)	(0.4		)	0.6			—			—
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares	—		—		—			(26.4		)	—			—			(26.4		)
Amortization of unearned equity compensation	—		—		9.9			—			—			—			9.9
BALANCE, September 30, 2017	16,905,368		$	0.2	$	1,052.8		$	109.0		$	(345.7	)	$	(32.7	)	$	783.6

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

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED)

	Nine Months Ended
	September 30,
	2017			2016
	(In millions of dollars)
Cash flows from operating activities:
Net income	$	60.6		$	67.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment	28.3			25.5
Amortization of definite-lived intangible assets	1.0			1.2
Amortization of debt discount and debt issuance costs	0.9			0.8
Deferred income taxes	38.6			40.7
Non-cash equity compensation	10.1			8.8
Lower of cost or market inventory write-down	—			4.9
Gain on sale of available for sale securities	(1.8		)	—
Non-cash unrealized gain on derivative instruments	(14.0		)	(16.9		)
Loss on extinguishment of debt	—			11.1
Non-cash intangible asset impairment charge	18.4			2.6
(Gain) loss on disposition of property, plant and equipment	(0.4		)	0.2
Non-cash net periodic postretirement benefit cost relating to Salaried VEBA	3.4			2.5
Other non-cash changes in assets and liabilities	(0.8		)	1.1
Changes in operating assets and liabilities:
Trade and other receivables	(4.0		)	(26.7		)
Inventories, excluding lower of cost or market write-down	(10.6		)	(8.9		)
Prepaid expenses and other current assets	(1.8		)	(0.9		)
Accounts payable	21.6			0.8
Accrued liabilities	0.9			27.9
Annual variable cash contributions to VEBAs	(20.0		)	(19.5		)
Long-term assets and liabilities, net	1.1			(15.0		)
Net cash provided by operating activities	131.5			107.4
Cash flows from investing activities1:
Capital expenditures	(56.1		)	(57.4		)
Purchase of available for sale securities	(196.0		)	(201.1		)
Proceeds from disposition of available for sale securities	237.2			30.0
Proceeds from disposal of property, plant and equipment	0.6			—
Net cash used in investing activities	(14.3		)	(228.5		)
Cash flows from financing activities1:
Repayment of principal and redemption premium of 8.25% Senior Notes	—			(206.0		)
Issuance of 5.875% Senior Notes	—			375.0
Cash paid for debt issuance costs	—			(6.8		)
Proceeds from stock option exercises	—			1.0
Repayment of capital lease	(0.2		)	(0.1		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(4.5		)	(2.8		)
Repurchase of common stock	(66.7		)	(13.6		)

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED)

	Nine Months Ended
	September 30,
	2017			2016
Cash dividends and dividend equivalents paid	(26.4		)	(24.4		)
Net cash (used in) provided by financing activities	(97.8		)	122.3
Net increase in cash, cash equivalents and restricted cash during the period	19.4			1.2
Cash, cash equivalents and restricted cash at beginning of period	67.7			83.7
Cash, cash equivalents and restricted cash at end of period	$	87.1		$	84.9

____________

¹  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.

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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, 2016. 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 mill products, such as aluminum plate and sheet and extruded and drawn products, for the following end market applications: aerospace and high strength ("Aero/HS products"), automotive applications ("Automotive Extrusions"), general engineering ("GE products") and other industrial ("Other products"). 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 2017 fiscal year. The financial information as of December 31, 2016 is derived from our audited consolidated financial statements and footnotes included in our Annual Report on Form 10-K for the year ended December 31, 2016.

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 a lower of cost or market inventory write-down of $4.9 million as a result of a decrease in our net realizable value of inventory. 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. There were no additional lower of cost or market inventory adjustments since the quarter ended March 31, 2016.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At September 30, 2017, the current cost of inventory exceeded its stated LIFO value by $12.5 million. At December 31, 2016, the stated LIFO value of our inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $8.5 million. Other inventories are stated on the first-in, first-out basis and consist of operating supplies, which are materials and supplies to be consumed during the production process. Inventory costs consist of material, labor and manufacturing overhead, including depreciation. Abnormal costs, such as idle facility expenses, freight, handling costs and spoilage, are accounted for as current period charges. All of our inventories at September 30, 2017 and December 31, 2016 were included in the Fabricated Products segment (see Note 2 for the components of inventories).

Replacement Parts. Replacement parts consist of preventative maintenance and capital spare parts, which are stated on the first-in, first-out basis. Replacement parts are recorded within Prepaid expenses and other current assets or Other assets depending on whether or not the expected utilization of the replacement parts is to occur within the current operating cycle.

Property, Plant and Equipment, Net. Property, plant and equipment, net is recorded at cost and includes construction in progress (see Note 2). Interest related to the construction of qualifying assets is capitalized as part of the construction costs. The amount of interest expense capitalized as construction in progress was $0.7 million and $0.6 million during the quarters ended September 30, 2017 and September 30, 2016, respectively. The amount of interest expense capitalized as construction in

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

progress was $1.9 million and $2.4 million during the nine months endedSeptember 30, 2017 and September 30, 2016, 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.

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.

Self Insurance of Workers' Compensation and Employee Healthcare Liabilities. We self-insure the majority of the costs of workers' compensation benefits and employee healthcare benefits and rely on insurance coverage to protect us from large losses on individual claims. Workers' compensation liabilities are based on a combination of estimates for: (i) incurred-but-not-reported claims and (ii) the ultimate expense of incurred claims. Such estimates are based on judgment, using our historical claims data and information and analysis provided by actuarial and claims advisors, our insurance carriers and other professionals. Our undiscounted workers' compensation liabilities were estimated at $26.6 million and $26.8 million for the periods ended September 30, 2017 and December 31, 2016, respectively. However, we account for our workers' compensation accrued liability on a discounted basis, using a discount rate of 2.00% at both September 30, 2017 and December 31, 2016. Accrued liabilities for employee healthcare benefits, which are estimates of unpaid incurred medical and prescription drug costs as provided by our healthcare administrators, were $3.3 million and $3.6 million as of September 30, 2017 and December 31, 2016, respectively.

Derivative Financial Instruments. Consistent with guidelines established by management and approved by our Board of Directors, we use derivative financial instruments to mitigate our exposure to changes in the market price of aluminum, alloying metals and energy and, to a lesser extent, foreign currency exchange rates. We do not use derivative financial instruments for trading or other speculative purposes. Hedging transactions are executed centrally on behalf of all of our operations to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors.

We reflect the fair value of all of our derivative instruments on our Consolidated Balance Sheets (see Note 9). The carrying values of hedges settling within one year are included in Prepaid expenses and other current assets or Other accrued liabilities. Carrying values for hedges settling beyond one year are included in Other assets or Long-term liabilities.

We do not meet the documentation requirements for hedge (deferral) accounting related to aluminum and energy derivatives. Accordingly, we record unrealized gain or loss associated with these hedges in the Statements of Consolidated Income within Unrealized gain on derivative instruments. As such derivatives settle, we reverse any previously recorded unrealized gain or loss associated with these hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

Forward swap contracts for zinc and copper ("Alloy Hedges") used in our fabrication operations are designated and qualify as cash flow hedges. Unrealized gain and loss associated with the Alloy Hedges are deferred in Other comprehensive income, net of tax. As Alloy Hedges settle, we reverse any unrealized gain or loss previously recorded within Other comprehensive income, net of tax associated with settling Alloy Hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

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. Some of these derivative contracts qualify for cash flow hedge accounting and are designated as cash flow hedges. The remainder are non-designated hedges. Both realized and unrealized gains and losses of foreign currency forward contracts designated as cash flow hedges are deferred in Accumulated other comprehensive loss and, over the period that the underlying equipment is depreciated, realized gains and losses are recorded as an adjustment to depreciation expense. For non-designated foreign currency forward contracts, gains and losses (both unrealized and realized) are reflected as an increase or reduction in Other income (expense), net.

Fair Value Measurements. We apply the fair value hierarchy established by GAAP for the recognition and measurement of certain financial assets and liabilities. An asset or liability's fair value classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. In determining fair value, we utilize valuation techniques

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

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 each period include our derivative instruments and available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 6). Additionally, we measure at fair value once each year at December 31 the plan assets of the Salaried VEBA (defined in Note 6) and our Canadian defined benefit pension plan. We record our remaining financial assets and liabilities at carrying value.

For a majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, we are not required to measure their 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 will be required, which could result in a reduction to the carrying amount of such asset or liability. See Note 4 for a discussion of the goodwill impairment charge recorded during the three months ended June 30, 2017 related to the operations at our Chandler, Arizona (Extrusion) facility.

We concluded that none of our other 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 quarter and nine months endedSeptember 30, 2017.

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), 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. In August 2015, ASU 2014-09 was amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 by one year for all entities and permits early adoption on a limited basis. ASU 2014-09 was subsequently amended by four additional pronouncements: (i) ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; (ii) ASU No. 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting; (iii) ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; and (iv) ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements to Topic 606.

We have evaluated the impacts on our financial reporting of adopting ASU 2014-09, including its subsequent amendments discussed above (together "ASC 606"), and have regularly reported our findings and implementation readiness to the Audit Committee and internal stakeholders. We plan to adopt ASC 606 using the modified retrospective transition approach for the fiscal year ending December 31, 2018, with the cumulative-effect adjustment recognized in beginning Retained earnings. In calculating the cumulative-effect adjustment, we will only apply the guidance to contracts not completed at the date of adoption. The primary change to our accounting policies upon adopting ASC 606 will relate to the timing of when revenue is recognized. While revenue from sales of certain contracts will continue to be recognized at a point in time, revenue from other contracts will be required to be recognized over time. Upon adoption, a majority of our Aero/HS products and a substantial portion of our Automotive Extrusions will convert to over time recognition. For these products, we will accelerate revenue recognition throughout the production process whereas previously we did not recognize revenue until the product shipped or reached its destination, based on the transfer of risks and title. We are still finalizing our assessment of the specific dollar impact that over-time recognition will have on our consolidated financial statements. After the cumulative-effect adjustment, however, we do not believe it will have a material effect on revenue recognized compared to current accounting during any given period.

We do not believe the adoption of ASC 606 will result in: (i) a change in the number of distinct performance obligations within our contractual arrangements; (ii) a change in our current capitalization and deferral policies; (iii) a change in our accounting for contract acquisition and fulfillment costs; (iv) the addition of any contract liability balances; or (v) the adjustment of the amount of promised consideration from our customers for the effects of significant financing components.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Additionally, we plan to account for shipping and handling activities that occur after the customer has obtained control of a product as fulfillment activities (i.e., an expense) rather than as a promised service (i.e., a revenue element).

As of September 30, 2017, we have: (i) finalized our review of most of our customer contracts; (ii) completed most of the system updates to track information needed to apply ASC 606; and (iii) trained internal stakeholders on the pending changes to revenue recognition policies and work procedures. We expect to complete our implementation work in time to adopt ASC 606 for periods starting after December 31, 2017.

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 assessing the impact and expect the adoption of this ASU in 2019 to have a material impact on our consolidated financial statements.

ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"), was issued in August 2017. The amendments under ASU 2017-12 refine and expand hedge accounting requirements for both financial (e.g., interest rate) and commodity risks. Its provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also makes certain targeted improvements to simplify the application of hedge accounting guidance. ASU 2017-12 becomes effective for us in the first quarter of 2019. We are currently assessing the impact the adoption of this ASU will have on our consolidated financial statements.

We do not anticipate any material impact on our consolidated financial statements upon the adoption of the following accounting pronouncements: (i) ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities;(ii) ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments; (iii) ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost; and (iv) ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.

There were no material impacts on our consolidated financial statements resulting from our early adoption in the first quarter of 2017 of the following accounting pronouncements: (i) ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; (ii) ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash;and (iii) ASU No. 2017-04, Intangibles - Goodwill and Other(Topic 350): Simplifying the Test for Goodwill Impairment.

2. Supplemental Balance Sheet Information

	September 30, 2017		December 31, 2016
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	17.3	$	37.9
Commercial paper	56.6		17.3
Total	$	73.9	$	55.2

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	September 30, 2017			December 31, 2016
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	138.8		$	138.2
Unbilled trade receivables	0.2			0.3
Trade receivables, gross	139.0			138.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	138.2		$	137.7
Inventories
Finished products	$	64.8		$	73.8
Work-in-process	86.1			71.7
Raw materials	56.9			51.1
Operating supplies	4.4			5.0
Total	$	212.2		$	201.6
Property, Plant and Equipment, Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	90.2			88.6
Machinery and equipment	675.0			615.1
Construction in progress	27.8			34.8
Property, plant and equipment, gross	815.7			761.2
Accumulated depreciation	(258.2		)	(230.6		)
Assets held for sale	0.3			0.3
Property, plant and equipment, net	$	557.8		$	530.9
Other Accrued Liabilities
Uncleared cash disbursements	$	7.1		$	5.8
Accrued income taxes and taxes payable	9.0			4.3
Accrued annual contribution to VEBAs	12.0			20.0
Accrued interest	8.4			2.9
Other	6.8			7.1
Total	$	43.3		$	40.1
Long-Term Liabilities
Workers' compensation accruals	$	25.0		$	25.0
Long-term environmental accrual – Note 8	16.1			15.8
Long-term portion of contingent contribution to Union VEBA – Note 6	—			12.8
Other long-term liabilities	20.8			19.6
Total	$	61.9		$	73.2

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

3. Debt and Credit Facility

Senior Notes

5.875% Senior Notes. In May 2016, we issued $375.0 million principal amount of 5.875% unsecured senior notes due May 15, 2024 ("5.875% Senior Notes") at 100% of the principal amount. The unamortized amount of debt issuance costs as of September 30, 2017 was $5.6 million. Interest expense, including amortization of debt issuance costs, relating to the 5.875% Senior Notes was $5.7 million and $17.1 million for the quarter and nine months endedSeptember 30, 2017, respectively, and $5.7 million and $8.8 million for the quarter and nine months endedSeptember 30, 2016. A portion of the interest relating to the 5.875% Senior Notes was capitalized as construction in progress. The effective interest rate of the 5.875% Senior Notes is approximately 6.1% per annum, taking into account the amortization of debt issuance costs. The fair value of the outstanding 5.875% Senior Notes, which are Level 1 liabilities, was calculated based on broker quotes and was approximately $402.1 million and $390.8 million at September 30, 2017 and December 31, 2016, respectively.

8.25% Senior Notes. In May 2012, we issued $225.0 million principal amount of 8.25% unsecured senior notes due June 1, 2020 ("8.25% Senior Notes"), of which $197.8 million principal amount remained outstanding at December 31, 2015. On June 1, 2016 we redeemed in full all remaining 8.25% Senior Notes at a redemption price of 104.125% of the principal amount. Interest expense, including amortization of debt issuance costs, relating to the 8.25% Senior Notes was $7.1 million for the nine months endedSeptember 30, 2016. A portion of the interest relating to the 8.25% Senior Notes was capitalized as construction in progress.

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 $294.4 million of borrowing availability under the Revolving Credit Facility at September 30, 2017, based on the borrowing base determination then in effect. At September 30, 2017, there were no borrowings under the Revolving Credit Facility and $7.8 million was being used to support outstanding letters of credit, leaving $286.6 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.50% at September 30, 2017.

4. Goodwill and Intangible Assets

Goodwill. Goodwill is related to our acquisitions of the Chandler, Arizona (Extrusion) facility and the Florence, Alabama facility and is included in the Fabricated Products segment. As of September 30, 2017, the carrying value of our goodwill was $18.8 million, reflecting an impairment in the quarter ended June 30, 2017. The carrying value was $37.2 million at both the beginning and the end of the year ended December 31, 2016.

Several factors identified in a qualitative review in the quarter ended June 30, 2017 indicated that long-term demand for hard alloy extruded shapes produced at the Chandler, Arizona (Extrusion) facility was less than previously assumed. Such factors included: (i) reduced build rates of wide body commercial aircraft; (ii) continued low build rates for business jets; and (iii) additional substitution away from hard alloy extruded shapes in favor of composites, titanium and/or aerospace aluminum plate in the manufacture of commercial aircraft. After testing for goodwill impairment applying Level 3 inputs and a combination of an income approach using the estimated discounted cash flow and a market-based valuation methodology, we impaired the carrying value of the Chandler, Arizona (Extrusion) facility by $18.4 million to its fair value as of June 30, 2017. As this goodwill is deductible for income tax purposes, the deferred tax effects were included in the impairment charge and income tax provision.

Intangible Assets. During the quarter ended September 30, 2016, we impaired one of our customer relationship intangible assets by $2.6 million. The non-cash impairment charge resulted from the loss of a customer during the quarter ended September 30, 2016.

Other than the impairments discussed above, we identified no other indicators of impairment associated with the remainder of our goodwill and intangible assets during the nine months endedSeptember 30, 2017 and September 30, 2016.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

5. Income Tax Matters

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Domestic	$	15.7	$	9.1	$	35.8	$	39.5
Foreign	0.4		0.3		1.0		0.7
Total	$	16.1	$	9.4	$	36.8	$	40.2

The income tax provision for the quarters ended September 30, 2017 and September 30, 2016 was $16.1 million and $9.4 million, respectively, reflecting an effective tax rate of 44.7% and 38.7%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended September 30, 2017 was due to an increase of $2.5 million for the recognition of a deferred tax liability associated with earnings of our Canadian subsidiary that are no longer considered indefinitely reinvested, resulting in a 7.1% increase to the blended statutory tax rate. We determined our indefinite reinvestment assertion with respect to our Canadian foreign earnings was no longer applicable based primarily on expectations that productivity improvements will obviate the need to make sizable capital investments to increase capacity.

There was no material difference between the effective tax rate and the projected blended statutory tax rate for the quarter endedSeptember 30, 2016.

The income tax provision for the nine months endedSeptember 30, 2017 and September 30, 2016 was $36.8 million and $40.2 million, respectively, reflecting an effective tax rate of 37.8% and 37.5%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the nine months endedSeptember 30, 2017 was due to: (i) a decrease of $1.7 million for the recognition of excess tax benefits from stock-based compensation, resulting in a 1.7% decrease to the blended statutory tax rate; (ii) a decrease of $0.5 million to the valuation allowance for certain state net operating losses, resulting in a 0.6% decrease to the blended statutory tax rate; (iii) a decrease of $0.2 million related to unrecognized tax benefits, including interest and penalties, resulting in a 0.2% decrease to the blended statutory tax rate; which was offset by (iv) an increase of $2.5 million for the recognition of a deferred tax liability associated with earnings of our Canadian subsidiary that are no longer indefinitely reinvested, resulting in a 2.6% 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 nine months endedSeptember 30, 2016.

Our gross unrecognized benefits relating to uncertain tax positions were $1.5 million and $1.8 million at September 30, 2017 and December 31, 2016, respectively, of which, $0.4 million and $0.7 million would be recorded through our income tax provision and thus impact the effective tax rate at September 30, 2017 and December 31, 2016, 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.

6. Employee Benefits

Pension and Similar Benefit Plans. We provide contributions to: (i) defined contribution 401(k) savings plans for salaried employees and certain hourly employees; (ii) 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; (iii) 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"), the International Association of Machinists and certain other unions at certain of our production facilities; and (iv) a defined benefit plan for salaried employees at our London, Ontario (Canada) facility.

Deferred Compensation Program. We have 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 as a result of the limitations imposed by the Internal Revenue Code of 1986. Despite the plan being an unfunded plan, we make an annual contribution to a rabbi trust to fulfill future funding obligations as contemplated by the terms of the plan. These assets are held in various

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

investment funds at certain registered investment companies and are accounted for as available for sale securities within Level 2 of the fair value hierarchy and are measured and recorded at fair value based on their quoted market prices. The fair value of these assets at September 30, 2017 and December 31, 2016 was $9.7 million and $8.2 million, respectively, and are included in Other assets. Offsetting liabilities relating to the deferred compensation plan are included in Long-term liabilities.

Union VEBA Postretirement Obligation. 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 spouses and eligible dependents ("Union VEBA"). We have an obligation to make variable cash contributions to the Union VEBA with respect to periods through September 2017. During the first quarter of 2017, we paid $17.1 million to the Union VEBA with respect to the twelve months ended December 31, 2016. Our final cash contribution to the Union VEBA with respect to the nine months ending September 30, 2017 will be paid in the first quarter of 2018. Although the final contribution amount is variable, it cannot exceed $12.8 million. As of September 30, 2017, $12.0 million was recorded within Other accrued liabilities for this final contribution.

Salaried VEBA Postretirement Obligation. Additionally, certain other retirees who retired prior to 2004 and certain employees who were hired prior to February 2002 and have subsequently retired or will retire with the requisite age and service, along with their surviving spouses and eligible dependents, are eligible to participate in a separate VEBA that provides healthcare cost, medical cost and long-term care insurance cost reimbursement benefits ("Salaried VEBA"). We have an ongoing obligation with no express termination date to make annual variable cash contributions to the Salaried VEBA 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, 2016. The contribution amount cannot exceed $2.9 million per year. Our contribution with respect to 2016 was $2.9 million, which we paid in the first quarter of 2017. We account for the Salaried VEBA as a defined benefit plan in our financial statements.

Fair Value of 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.

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: (i) a charge for service rendered by employees; (ii) a charge for accretion of interest; (iii) a benefit for the return on plan assets; and (iv) amortization of prior service costs associated with plan amendments and net gains or losses on assets. Net periodic benefit cost related to the Canadian defined benefit plan was not material for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016.

The following table presents the components of Net periodic postretirement benefit cost relating to Salaried VEBA for the periods presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA1:
Interest cost	$	0.8		$	0.7		$	2.3		$	2.2
Expected return on plan assets	(1.0		)	(1.0		)	(3.1		)	(3.0		)
Amortization of prior service cost	1.2			1.0			3.6			3.0
Amortization of net actuarial loss	0.2			0.1			0.6			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	$	1.2		$	0.8		$	3.4		$	2.5

____________

¹  The service cost was insignificant for all periods presented.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following table presents the total charges (income) related to all benefit plans for the periods presented (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017			2016
Included within Fabricated Products:
Deferred compensation plan	$	0.1	$	0.1	$	0.3		$	0.2
Defined contribution plans	1.3		1.6		6.8			6.7
Multiemployer pension plans	1.1		1.2		3.4			3.5
Total Fabricated Products	$	2.5	$	2.9	$	10.5		$	10.4
Included within All Other:
Deferred compensation plan	0.4		0.4		1.1			0.6
Defined contribution plans	0.1		0.1		0.7			0.7
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2		0.8		3.4			2.5
Loss (gain) on removal of Union VEBA net assets	0.5		—		(0.8		)	(0.1		)
Total All Other	$	2.2	$	1.3	$	4.4		$	3.7
Total	$	4.7	$	4.2	$	14.9		$	14.1

For all periods presented, 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").

7. 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 return on adjusted net assets of our Fabricated Products business. Most of our production facilities have similar programs for both hourly and salaried employees. As of September 30, 2017, we had a liability of $14.5 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the nine month performance period of our 2017 STI Plan.

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, were eligible to participate in the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan ("2016 Plan"). The 2016 Plan was approved by stockholders on May 26, 2016 and replaced and succeeded in its entirety the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan. At September 30, 2017, 735,724 shares were available for awards under the 2016 Plan.

Non-Vested Common Shares and Restricted Stock Units. We grant non-vested common shares to our non-employee directors and non-vested common shares and restricted stock units to our 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 or a cash amount equaling the value of 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.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Performance Shares. 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 and earned entitles the recipient to receive one common share or a cash amount equaling the value of one common share. During the first quarter of 2017, performance shares granted in 2014 under the 2014-2016 LTI Program vested (see "Summary of Activity" below). The number of performance shares that vested and resulted in the issuance of common shares was determined based on our total shareholder return ("TSR") compared to the TSR of a specified group of peer companies over a three-year performance period.

Performance shares granted in 2015 are subject to performance conditions pertaining to our TSR relative to the TSR of a specified group of peer companies over a three-year performance period ("TSR-Based Performance Shares").

Performance shares granted in 2016 consist of TSR-Based Performance Shares and performance shares subject to performance requirements pertaining to our total controllable cost performance over a three-year performance period ("CP-Based Performance Shares").

Performance shares granted in 2017 consist of TSR-Based Performance Shares, CP-Based Performance Shares and performance shares subject to performance conditions pertaining to our economic value added ("EVA") performance, determined based on our adjusted pre-tax operating income in excess of a capital charge, over a three-year performance period ("EVA-Based Performance Shares").

The number of performance shares under the 2015-2017, 2016-2018 and 2017-2019 LTI Programs that may be earned and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares, which is approximately one-half of the maximum payout. The performance shares granted under the 2015-2017, 2016-2018 and 2017-2019 LTI Programs will vest in 2018, 2019 and 2020, respectively.

Non-Cash Compensation Expense. Non-cash compensation expense relating to all awards 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares and restricted stock units	$	1.4	$	1.2	$	3.9	$	3.5
TSR-Based Performance Shares	1.2		1.5		3.7		4.0
CP-Based Performance Shares	0.8		0.4		2.0		0.9
EVA-Based Performance Shares	0.2		—		0.4		0.3
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Fabricated Products	$	1.3	$	1.2	$	3.8	$	3.1
All Other	2.3		1.9		6.2		5.6
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of September 30, 2017:

	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	$	9.6	2.6
TSR-Based Performance Shares	$	5.6	1.7
CP-Based Performance Shares	$	6.1	2.1
EVA-Based Performance Shares	$	1.5	2.4

Summary of Activity. A summary of the activity with respect to non-vested common shares, restricted stock units, TSR-Based Performance Shares, CP-Based Performance Shares and EVA-Based Performance Shares for the nine months endedSeptember 30, 2017 is as follows:

	Non-Vested Common Shares				Restricted Stock Units				TSR-Based Performance Shares				CP-Based Performance Shares				EVA-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, 2016	114,658		$	69.51	61,800		$	74.94	394,525		$	90.30	63,678		$	80.46	—		$	—
Granted1	11,817		86.92		92,275		76.13		65,044		97.88		65,044		79.69		32,504		79.69
Vested	(46,689	)	71.46		(8,655	)	76.94		(94,082	)	83.18		—		—		—		—
Forfeited1	(427	)	69.83		(6,412	)	77.70		(5,519	)	95.88		(3,342	)	79.92		(1,164	)	79.69
Canceled1	—		—		—		—		(55,288	)	83.18		—		—		—		—
Outstanding at September 30, 2017	79,359		$	70.96	139,008		$	75.72	304,680		$	95.31	125,380		$	80.07	31,340		$	79.69

____________

¹  For 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 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares	$	—	$	—	$	86.92	$	86.11
Restricted stock units	$	82.33	$	—	$	76.13	$	75.57
TSR-Based Performance Shares	$	—	$	—	$	97.88	$	93.02
CP-Based Performance Shares	$	—	$	—	$	79.69	$	80.46
EVA-Based Performance Shares	$	—	$	—	$	79.69	$	—

Stock Options. As of December 31, 2016, we had 1,543 fully-vested outstanding stock options exercisable to purchase common shares at $80.01 per share, all of which subsequently expired on April 2, 2017. No options were granted during the nine months endedSeptember 30, 2017, and no options were outstanding as of September 30, 2017.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

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 nine months endedSeptember 30, 2017 and September 30, 2016, 56,195 and 35,498 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.

8. 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 9).

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 are also subject to legacy environmental contingencies related to activities that occurred at operating facilities within Fabricated Products prior to July 6, 2006 while such operating facilities were being operated by a predecessor, which represent the majority of our environmental accruals. The status of these environmental contingencies are discussed below. 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.

We continue to pursue remediation activities, primarily to address the historical use of oils containing polychlorinated biphenyls ("PCBs") at our Spokane, Washington ("Trentwood") facility. Our remediation efforts are in collaboration with the Washington State Department of Ecology ("Washington State Ecology"), to which we submitted a feasibility study in 2012 of remediation alternatives and from which we received permission to begin certain remediation activities pursuant to a signed work order. As we have finished a number of sections of the work plan, we have received approval from Washington State Ecology on satisfactory completion of those sections. Additionally, in cooperation with Washington State Ecology, to determine the treatability and evaluate the feasibility of removing PCBs from ground water under the Trentwood facility, we constructed a pilot test facility and began treatment operations at the test facility in the first half of 2016. As the success of the new methodology cannot be reasonably determined at this time, it is possible we may need to make upward adjustments to our related accruals as facts and cost estimates regarding the groundwater treatment method and the operation of the treatment facility 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 have 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 12 to 15 months.

At September 30, 2017, our environmental accrual of $16.9 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 $12.2 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

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

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 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.

9. Derivatives, Hedging Programs and Other Financial Instruments

Overview. In conducting our business, we enter into derivative transactions, including forward contracts and options, to limit our exposure to: (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 other officers and employees selected by the chief executive officer.The Hedging Committee meets regularly to review commodity price exposure, derivative positions and strategy, and management reports to our Board of Directors on the scope of its activities.

We are exposed to counterparty credit risk on all of our derivative instruments, which we manage by monitoring the credit quality of our counterparties and allocating our hedging positions among multiple counterparties to limit exposure to any single entity. Our counterparties are major, investment grade financial institutions or trading companies. Hedging transactions are governed by negotiated reciprocal credit lines, which generally require collateral to be posted above specified credit thresholds. We believe the risk of loss is remote and contained due to counterparty credit quality, our diversification practice and collateral requirements.

In a majority of our hedging counterparty agreements, our counterparty offers us a credit line that adjusts up or down, depending on our liquidity. Below specified liquidity thresholds, we may have to post collateral if the fair value of our net liability with such counterparty exceeds our reduced credit line. We manage this risk by allocating hedging transactions among multiple counterparties, using 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 insignificant at both September 30, 2017 and December 31, 2016, and we had no collateral posted as of those dates.

Additionally, our firm-price customer sales commitments create incremental customer credit risk related to metal price movements. Under certain circumstances, we mitigate this risk by periodically requiring cash collateral from them, which we classify as deferred revenue and include as a component of Other accrued liabilities. At September 30, 2017, we had no cash collateral posted from any of our customers. For more information about concentration risks concerning customers and suppliers, see Note 11.

Notional Amount of Derivative Contracts. The following table summarizes our derivative positions at September 30, 2017:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Purchased put option contracts	10/17 through 12/17	13.4
Fixed price purchase contracts	10/17 through 12/21	151.9
Fixed price sales contracts	10/17 through 11/19	1.8
Midwest premium swap contracts1	10/17 through 12/21	150.1

Alloying Metals	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Fixed price purchase contracts	10/17 through 6/18	4.6

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	10/17 through 12/20	3,650,000

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	10/17 through 4/18	301,304

______________________

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 September 30, 2017, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 72% of the expected natural gas purchases for the remainder of 2017, 71% of the expected natural gas purchases for both 2018 and 2019 and 39% of the expected natural gas purchases for 2020.

We have physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for the remainder of 2017, 55% of the expected electricity purchases for both 2018 and 2019 and 18% of the expected electricity purchases for 2020.

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.

We are exposed to risk of fluctuating prices for natural gas and electricity. We, from time to time, in the ordinary course of business, enter into hedging transactions and/or physical delivery commitments with third parties to mitigate our risk from fluctuations in natural gas and electricity prices.

We are also exposed to foreign currency exchange risk related to firm-price agreements for equipment purchases from foreign manufacturers. We use foreign currency forward contracts designed to line up with the timing and amounts of scheduled payments to the foreign equipment manufacturers to mitigate our exposure to currency exchange rate fluctuations on these purchases. Realized and unrealized periodic gains and losses of non-designated foreign currency forward contracts are reflected as a reduction or increase in Other income (expense), net.

Designated Alloying Metal Hedges. We enter into agreements with suppliers to purchase alloying metals (zinc and copper) used as raw materials in our fabrication operations at fluctuating prices that we are unable to pass along to our customers. We mitigate our exposure to metal price risk by entering into Alloy Hedges with third-party financial institutions at predetermined/fixed prices at stated delivery dates. Our Alloy Hedges are expected to be highly effective because monthly settlements correspond to forecasted physical purchases of alloying metals by our manufacturing facilities. The effective portion of the fair value on these Alloy Hedges is recorded within Other comprehensive income, net of tax, and is reclassified into the Statements of Consolidated Income during the month of settlement to Cost of products sold (See Note 14). As of September 30, 2017, we estimate the net gain of $0.5 million will be reclassified from Accumulated other comprehensive income into Net income within the next 12 months. We incurred no ineffectiveness on these hedges during the quarter and nine months endedSeptember 30, 2017.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Realized and Unrealized Gain and Loss. Realized and unrealized (gain) loss included on the Statements of Consolidated Income associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Realized (gain) loss:
Aluminum	$	(4.0	)	$	0.4		$	(13.8	)	$	4.1
Natural gas	0.2			0.9			0.3			4.2
Alloy Hedges	(0.3		)	—			(0.2		)	—
Foreign exchange	(0.1		)	—			(0.1		)	—
Total realized (gain) loss1	$	(4.2	)	$	1.3		$	(13.8	)	$	8.3
Unrealized (gain) loss:
Aluminum	$	(10.6	)	$	(1.7	)	$	(15.3	)	$	(11.7	)
Natural gas	(0.2		)	(0.3		)	1.3			(5.2		)
Total unrealized gain2	$	(10.8	)	$	(2.0	)	$	(14.0	)	$	(16.9	)

______________________

¹  Recorded within Cost of products sold, excluding depreciation, amortization and other items within the Fabricated Products segment.

²  Recorded within Unrealized gain on derivative instruments within the Fabricated Products segment.

Fair Values of Derivative Contracts. The fair values of our derivative contracts are based upon trades in liquid markets. Valuation model inputs can be verified, and valuation techniques do not involve significant judgment. The fair values of such financial instruments are classified within Level 2 of the fair value hierarchy.

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):

	September 30, 2017
	Level 1		Level 2		Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	18.4	$	—	$	18.4
Midwest premium swap contracts	—		0.8		—		0.8
Natural gas – Fixed price purchase contracts	—		0.4		—		0.4
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		0.9		—		0.9
Total derivative assets1	$	—	$	20.5	$	—	$	20.5

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

	September 30, 2017
	Level 1		Level 2			Level 3		Total
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price sales contracts	$	—	$	(0.1	)	$	—	$	(0.1	)
Midwest premium swap contracts	—		(0.8		)	—		(0.8		)
Natural gas – Fixed price purchase contracts	—		(0.5		)	—		(0.5		)
Total derivative liabilities2	$	—	$	(1.4	)	$	—	$	(1.4	)

____________

¹  Of the $20.5 million in total derivative assets, $15.8 million and $4.7 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.4 million in total derivative liabilities, $0.9 million and $0.5 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

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, 2016
	Level 1		Level 2			Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	3.3		$	—	$	3.3
Midwest premium swap contracts	—		0.9			—		0.9
Natural gas – Fixed price purchase contracts	—		1.6			—		1.6
Total derivative assets1	$	—	$	5.8		$	—	$	5.8
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	(1.1	)	$	—	$	(1.1	)
Midwest premium swap contracts	—		(0.2		)	—		(0.2		)
Natural gas – Fixed price purchase contracts	—		(0.4		)	—		(0.4		)
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		(0.1		)	—		(0.1		)
Total derivative liabilities2	$	—	$	(1.8	)	$	—	$	(1.8	)

____________

¹  Of the $5.8 million in total derivative assets, $5.0 million and $0.8 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.8 million in total derivative liabilities, $0.8 million and $1.0 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The aggregate fair value of our derivatives at September 30, 2017 and December 31, 2016 was a net asset of $19.1 million and a net asset of $4.0 million, respectively. The increase in the net asset position during the nine months endedSeptember 30, 2017 was primarily due to changes in the underlying commodity and energy prices, as well as settlement of positions during the period. Changes in the fair value of our derivative contracts relating to non-designated hedges of operational activities are reflected in Operating income.

Offsetting Information. We enter into derivative contracts with counterparties subject to enforceable master netting arrangements and, from time to time, not subject to netting arrangements. We reflect the fair value of our derivative contracts on a gross basis on the Consolidated Balance Sheets. We had no cash collateral pledged or received with our counterparties as of both September 30, 2017 and December 31, 2016.

The following tables present offsetting information regarding our derivatives by type of counterparty as of September 30, 2017 (in millions of dollars):

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	20.5	$	—	$	20.5	$	1.4	$	19.1
Total	$	20.5	$	—	$	20.5	$	1.4	$	19.1

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—
Total	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—

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

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	3.3	$	—	$	3.3	$	1.0	$	2.3
Counterparty (with partial netting agreements)	2.5		—		2.5		0.7		1.8
Total	$	5.8	$	—	$	5.8	$	1.7	$	4.1

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.0	)	$	—	$	(1.0	)	$	(1.0	)	$	—
Counterparty (with partial netting agreements)	(0.8		)	—		(0.8		)	(0.7		)	(0.1		)
Total	$	(1.8	)	$	—	$	(1.8	)	$	(1.7	)	$	(0.1	)

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

Fair Value of Other Financial Instruments

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 September 30, 2017, all of our short-term investments had maturity dates within 12 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 September 30, 2017 and December 31, 2016, the total unrealized loss, net of tax, included in Accumulated other comprehensive income 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 was due to normal market fluctuations, and not due to increased credit risk or other valuation concerns. The fair value input of our available for sale securities, which are classified within Level 2 of the fair value hierarchy, is calculated based on broker quotes. 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. See Note 2 for components of cash and cash equivalents.

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of September 30, 2017 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.3	$	56.6	$	—	$	73.9
Short-term investments	—		191.4		—		191.4
Total	$	17.3	$	248.0	$	—	$	265.3

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of December 31, 2016 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	37.9	$	17.3	$	—	$	55.2
Short-term investments	—		231.0		—		231.0
Total	$	37.9	$	248.3	$	—	$	286.2

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

10. Net Income Per Share and Stockholders' Equity

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Numerator:
Net income	$	19.9	$	14.9	$	60.6	$	67.2
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	16,834		17,841		17,072		17,858
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options	326		334		291		323
Diluted2	17,160		18,175		17,363		18,181
Net income per common share, Basic:	$	1.18	$	0.84	$	3.55	$	3.76
Net income per common share, Diluted:	$	1.16	$	0.82	$	3.49	$	3.70

______________________

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 and nine months endedSeptember 30, 2017 and September 30, 2016 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Non-vested common shares, restricted stock units and performance shares	3	3	3	2
Total excluded	3	3	3	2

Dividends. During the nine months endedSeptember 30, 2017 and September 30, 2016, we paid a total of approximately $26.4 million and $24.4 million, respectively, in cash dividends to stockholders, including the holders of restricted stock, and in dividend equivalents to the holders of certain restricted stock units and performance shares.

Stock Repurchase Program. From time to time, we repurchase shares pursuant to a stock repurchase program authorized by our Board of Directors. Such repurchases of our common stock are recorded as Treasury stock. 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.

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KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

The following table summarizes repurchases recorded as treasury stock for each period presented:

	Nine Months Ended
	September 30,
	2017		2016
Number of common shares repurchased	806,307		170,304
Weighted-average repurchase price (dollars per share)	$	80.60	$	81.04
Total cost of repurchased common shares (in millions of dollars)	$	64.9	$	13.8

At September 30, 2017, $123.4 million were available to repurchase our common shares pursuant to the stock repurchase program.

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 Aero/HS products, Automotive Extrusions, GE products and 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 September 30, 2017, approximately 64% of our employees were covered by collective bargaining agreements and approximately 12% of our employees were covered by collective bargaining agreements with expiration dates occurring within one year from September 30, 2017.

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.

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

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						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Net sales:
Fabricated Products	$	332.8		$	320.6		$	1,044.4		$	998.7
Segment operating income (loss):
Fabricated Products	$	53.7		$	42.1		$	149.9		$	172.1
All Other	(13.9		)	(12.3		)	(39.2		)	(39.6		)
Total operating income	$	39.8		$	29.8		$	110.7		$	132.5
Interest expense	(5.3		)	(5.5		)	(16.4		)	(14.7		)
Other income (expense), net	1.5			—			3.1			(10.4		)
Income before income taxes	$	36.0		$	24.3		$	97.4		$	107.4
Depreciation and amortization:
Fabricated Products	$	10.1		$	8.8		$	28.9		$	26.2
All Other	0.1			0.2			0.4			0.5
Total depreciation and amortization	$	10.2		$	9.0		$	29.3		$	26.7
Capital expenditures:
Fabricated Products	$	16.3		$	15.0		$	55.7		$	57.1
All Other	0.1			0.1			0.4			0.3
Total capital expenditures	$	16.4		$	15.1		$	56.1		$	57.4

	September 30, 2017		December 31, 2016
Assets:
Fabricated Products	$	1,007.9	$	969.4
All Other1	414.8		474.1
Total assets	$	1,422.7	$	1,443.5

_____________________

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 for the Fabricated Products segment by end market applications were as follows (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Net sales:
Aero/HS products	$	150.2	$	156.1	$	483.2	$	500.7
Automotive Extrusions	52.7		46.5		161.6		143.6
GE products	115.9		105.6		361.1		318.3
Other products	14.0		12.4		38.5		36.1
Total net sales	$	332.8	$	320.6	$	1,044.4	$	998.7

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

All income taxes are paid by the Fabricated Products reporting segment. Geographic information for income taxes paid was as follows (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Income taxes paid:
Domestic	$	0.3	$	0.1	$	0.7	$	0.4
Foreign	—		—		0.1		0.5
Total income taxes paid	$	0.3	$	0.1	$	0.8	$	0.9

Concentrations. For the quarter ended September 30, 2017, one customer represented 27% and another represented 11% of Fabricated Products Net sales. For the quarter endedSeptember 30, 2016, one customer represented 25% and another represented 11% of Fabricated Products Net Sales. For the nine months endedSeptember 30, 2017, one customer represented 28% and another represented 10% of Fabricated Products Net sales. For the nine months endedSeptember 30, 2016, one customer represented 26% and another represented 10% of Fabricated Products Net Sales.

At September 30, 2017, one customer represented 17% and a second customer represented 16% of Trade receivables, net. One individual customer accounted for 18% and two individual customers each accounted for 12% of Trade receivables, net at December 31, 2016.

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Percentage of total primary aluminum supply (lbs):
Supply from our top five major suppliers	86	%	84	%	85	%	84	%
Supply from our largest supplier	35	%	28	%	36	%	32	%
Supply from our second and third largest suppliers	35	%	33	%	33	%	31	%

28

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

12. Supplemental Cash Flow Information

	Nine Months Ended
	September 30,
	2017		2016
	(In millions of dollars)
Interest paid	$	10.0	$	6.7
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	3.4	$	2.4
Stock repurchases not yet settled	$	—	$	0.2
Acquisition of property and equipment through capital leasing arrangements	$	0.3	$	—
Components of cash, cash equivalents and restricted cash:	September 30, 2017		September 30, 2016
Cash and cash equivalents	$	73.9	$	72.9
Restricted cash included in Prepaid expenses and other current assets1	0.3		0.3
Restricted cash included in Other assets1	12.9		11.7
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$	87.1	$	84.9

____________

¹  We are required to keep on deposit certain amounts that are pledged or held as collateral relating to workers' compensation and other agreements. We account for such deposits as restricted cash. From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash.

13. Other Income (Expense), Net

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

	Quarter Ended					Nine Months Ended
	September 30,					September 30,
	2017		2016			2017		2016
Interest income	$	—	$	—		$	—	$	0.1
Realized gain on investments	0.8		0.1			2.2		0.4
Loss on extinguishment of debt1	—		—			—		(11.1		)
All other income (expense), net	0.7		(0.1		)	0.9		0.2
Other income (expense), net	$	1.5	$	—		$	3.1	$	(10.4	)

____________

¹  Represents the loss on extinguishment of our 8.25% Senior Notes during the nine months ended September 30, 2016, which included an $8.2 million premium paid to redeem the notes and a $2.9 million write-off of unamortized debt issuance costs associated with the notes.

29

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

14. Accumulated Other Comprehensive (Loss) Income

The following table presents the changes in the accumulated balances for each component of Accumulated other comprehensive (loss) income ("AOCI") for each period presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA and defined benefit pension plan:
Beginning balance	$	(35.4	)	$	(29.8	)	$	(37.1	)	$	(31.3	)
Amortization of net actuarial loss1	0.2			0.1			0.6			0.3
Amortization of prior service cost1	1.2			1.0			3.6			3.0
Less: income tax expense2	(0.5		)	(0.4		)	(1.6		)	(1.2		)
Net amortization reclassified from AOCI to Net income	0.9			0.7			2.6			2.1
Translation impact on Canadian pension plan AOCI balance	(0.1		)	—			(0.1		)	0.1
Other comprehensive income, net of tax	0.8			0.7			2.5			2.2
Ending balance	$	(34.6	)	$	(29.1	)	$	(34.6	)	$	(29.1	)
Available for sale securities:
Beginning balance	$	1.1		$	0.2		$	0.8		$	(0.1	)
Unrealized gain on available for sale securities	1.0			0.9			3.1			1.3
Less: income tax expense	(0.4		)	(0.4		)	(1.2		)	(0.5		)
Net unrealized gain on available for sale securities	0.6			0.5			1.9			0.8
Reclassification of unrealized gain upon sale of available for sale securities3	(0.5		)	(0.3		)	(2.1		)	(0.3		)
Less: income tax benefit2	0.2			0.1			0.8			0.1
Net unrealized gain reclassified from AOCI to Net income	(0.3		)	(0.2		)	(1.3		)	(0.2		)
Other comprehensive income, net of tax	0.3			0.3			0.6			0.6
Ending balance	$	1.4		$	0.5		$	1.4		$	0.5
Other:
Beginning balance	$	—		$	(0.3	)	$	(0.4	)	$	(0.3	)
Unrealized gain	1.1			0.1			1.4			0.2
Less: income tax expense	(0.4		)	—			(0.5		)	(0.1		)
Net gain	0.7			0.1			0.9			0.1
Gain reclassified from AOCI to Net income	(0.3		)	—			—			—
Less: income tax benefit2	0.1			—			—			—
Net gain reclassified from AOCI to Net income	(0.2		)	—			—			—
Other comprehensive income, net of tax	0.5			0.1			0.9			0.1
Ending balance	$	0.5		$	(0.2	)	$	0.5		$	(0.2	)
Total AOCI ending balance	$	(32.7	)	$	(28.8	)	$	(32.7	)	$	(28.8	)

________________

¹  Amounts reclassified out of AOCI relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.

²  Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.

30

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NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

³  Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.

15. Condensed Guarantor and Non-Guarantor Financial Information

During the quarter ended June 30, 2016, we issued $375.0 million aggregate principal amount of our 5.875% Senior Notes and redeemed in full the remaining principal balance of our 8.25% Senior Notes. The 5.875% Senior Notes were issued by Kaiser Aluminum Corporation ("Parent") pursuant to an indenture dated May 12, 2016 ("Indenture") with Wells Fargo Bank, National Association, as trustee ("Trustee"). The obligations of the Parent under the Indenture are guaranteed by Kaiser Aluminum Investments Company, Kaiser Aluminum Fabricated Products, LLC and Kaiser Aluminum Washington, LLC, ("Guarantor Subsidiaries"). An additional Guarantor Subsidiary, Kaiser Aluminum Alexco, LLC, merged with and into Kaiser Aluminum Fabricated Products, LLC during the first quarter of 2017. All Guarantor Subsidiaries 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 September 30, 2017 and December 31, 2016, and for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016present: (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 on a combined basis; (ii) the "Consolidating Adjustments," which represent the adjustments necessary to eliminate the investments in our subsidiaries, other intercompany balances and other intercompany sales and cost of sales 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. The condensed consolidating financial information should be read in conjunction with the consolidated financial statements herein.

31

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

September 30, 2017

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	70.7	$	3.2	$	—		$	73.9
Short-term investments	—		191.4		—		—			191.4
Receivables:
Trade receivables, net	—		133.1		5.1		—			138.2
Intercompany loans receivable	55.6		0.1		0.6		(56.3		)	—
Other	—		14.6		0.8		—			15.4
Inventories	—		208.5		8.6		(4.9		)	212.2
Prepaid expenses and other current assets	0.1		31.0		0.4		—			31.5
Total current assets	55.7		649.4		18.7		(61.2		)	662.6
Investments in and advances to subsidiaries	1,107.0		41.9		—		(1,148.9		)	—
Property, plant and equipment, net	—		527.6		30.2		—			557.8
Long-term intercompany loans receivable	—		—		10.5		(10.5		)	—
Deferred tax assets, net	—		113.9		—		4.8			118.7
Intangible assets, net	—		25.3		—		—			25.3
Goodwill	—		18.8		—		—			18.8
Other assets	—		39.5		—		—			39.5
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	1.4	$	86.8	$	6.2	$	—		$	94.4
Intercompany loans payable	—		56.2		0.1		(56.3		)	—
Accrued salaries, wages and related expenses	—		37.2		1.8		—			39.0
Other accrued liabilities	8.3		41.0		1.1		(7.1		)	43.3
Total current liabilities	9.7		221.2		9.2		(63.4		)	176.7
Net liabilities of Salaried VEBA	—		27.8		—		—			27.8
Deferred tax liabilities	—		—		3.3		—			3.3
Long-term intercompany loans payable	—		10.5		—		(10.5		)	—
Long-term liabilities	—		59.3		2.6		—			61.9
Long-term debt	369.4		—		—		—			369.4
Total liabilities	379.1		318.8		15.1		(73.9		)	639.1
Total stockholders' equity	783.6		1,097.6		44.3		(1,141.9		)	783.6
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7

32

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	52.9	$	2.3		$	—		$	55.2
Short-term investments	—		231.0		—			—			231.0
Receivables:
Trade receivables, net	—		133.1		4.6			—			137.7
Intercompany receivables	85.8		0.1		0.6			(86.5		)	—
Other	—		11.4		0.5			—			11.9
Inventories	—		197.5		8.0			(3.9		)	201.6
Prepaid expenses and other current assets	0.1		18.0		0.9			(0.5		)	18.5
Total current assets	85.9		644.0		16.9			(90.9		)	655.9
Investments in and advances to subsidiaries	1,012.4		40.1		—			(1,052.5		)	—
Property, plant and equipment, net	—		499.5		31.4			—			530.9
Long-term intercompany receivables	80.2		—		4.9			(85.1		)	—
Deferred tax assets, net	—		154.9		—			4.8			159.7
Intangible assets, net	—		26.4		—			—			26.4
Goodwill	—		37.2		—			—			37.2
Other assets	—		33.4		—			—			33.4
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	2.2	$	68.9	$	4.7		$	—		$	75.8
Intercompany payable	—		86.4		0.1			(86.5		)	—
Accrued salaries, wages and related expenses	—		47.2		1.9			—			49.1
Other accrued liabilities	2.9		52.6		(0.7		)	(14.7		)	40.1
Total current liabilities	5.1		255.1		6.0			(101.2		)	165.0
Net liabilities of Salaried VEBA	—		28.6		—			—			28.6
Deferred tax liabilities	—		—		3.3			—			3.3
Long-term intercompany payable	—		85.1		—			(85.1		)	—
Long-term liabilities	—		70.5		2.7			—			73.2
Long-term debt	368.7		—		—			—			368.7
Total liabilities	373.8		439.3		12.0			(186.3		)	638.8
Total stockholders' equity	804.7		996.2		41.2			(1,037.4		)	804.7
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5

33

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	325.9		$	26.3		$	(19.4	)	$	332.8
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			261.6			24.0			(18.4		)	267.2
Unrealized gain on derivative instruments	—			(10.8		)	—			—			(10.8		)
Depreciation and amortization	—			9.7			0.5			—			10.2
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			23.5			0.8			(0.6		)	24.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			1.2			—			—			1.2
Loss on removal of Union VEBA net assets	—			0.5			—			—			0.5
Total selling, general, administrative, research and development	1.0			25.2			0.8			(0.6		)	26.4
Total costs and expenses	1.0			285.7			25.3			(19.0		)	293.0
Operating (loss) income	(1.0		)	40.2			1.0			(0.4		)	39.8
Other (expense) income:
Interest expense	(5.0		)	(0.4		)	—			0.1			(5.3		)
Other income, net	—			1.3			0.3			(0.1		)	1.5
(Loss) income before income taxes	(6.0		)	41.1			1.3			(0.4		)	36.0
Income tax provision	—			(18.0		)	(0.4		)	2.3			(16.1		)
Earnings in equity of subsidiaries	25.9			0.6			—			(26.5		)	—
Net income	$	19.9		$	23.7		$	0.9		$	(24.6	)	$	19.9
Comprehensive income	$	21.5		$	25.3		$	0.9		$	(26.2	)	$	21.5

34

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	1,019.7		$	85.4		$	(60.7	)	$	1,044.4
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			805.8			75.0			(58.1		)	822.7
Unrealized gain on derivative instruments	—			(14.0		)	—			—			(14.0		)
Depreciation and amortization	—			27.7			1.6			—			29.3
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.4			67.2			5.7			(1.6		)	74.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			3.4			—			—			3.4
Gain on removal of Union VEBA net assets	—			(0.8		)	—			—			(0.8		)
Total selling, general, administrative, research and development	3.4			69.8			5.7			(1.6		)	77.3
Goodwill impairment	—			18.4			—			—			18.4
Total costs and expenses	3.4			907.7			82.3			(59.7		)	933.7
Operating (loss) income	(3.4		)	112.0			3.1			(1.0		)	110.7
Other (expense) income:
Interest expense	(15.3		)	(1.2		)	—			0.1			(16.4		)
Other income, net	—			2.7			0.5			(0.1		)	3.1
(Loss) income before income taxes	(18.7		)	113.5			3.6			(1.0		)	97.4
Income tax provision	—			(43.0		)	(0.9		)	7.1			(36.8		)
Earnings in equity of subsidiaries	79.3			1.8			—			(81.1		)	—
Net income	$	60.6		$	72.3		$	2.7		$	(75.0	)	$	60.6
Comprehensive income	$	64.6		$	76.3		$	2.7		$	(79.0	)	$	64.6

35

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	313.9		$	26.6		$	(19.9	)	$	320.6
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			250.0			23.7			(19.0		)	254.7
Unrealized gain on derivative instruments	—			(2.0		)	—			—			(2.0		)
Depreciation and amortization	—			8.5			0.5			—			9.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.9			24.0			1.3			(0.6		)	25.6
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Total selling, general, administrative, research and development	0.9			24.8			1.3			(0.6		)	26.4
Other operating charges, net	—			2.7			—			—			2.7
Total costs and expenses	0.9			284.0			25.5			(19.6		)	290.8
Operating (loss) income	(0.9		)	29.9			1.1			(0.3		)	29.8
Other (expense) income:
Interest (expense) income	(5.7		)	0.1			—			0.1			(5.5		)
Other (expense) income, net	(0.1		)	0.1			0.1			(0.1		)	—
(Loss) income before income taxes	(6.7		)	30.1			1.2			(0.3		)	24.3
Income tax provision	—			(11.6		)	(0.3		)	2.5			(9.4		)
Earnings in equity of subsidiaries	21.6			0.7			—			(22.3		)	—
Net income	$	14.9		$	19.2		$	0.9		$	(20.1	)	$	14.9
Comprehensive income	$	16.0		$	20.3		$	0.9		$	(21.2	)	$	16.0

36

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	976.9		$	80.6		$	(58.8	)	$	998.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			753.1			70.3			(56.3		)	767.1
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(16.9		)	—			—			(16.9		)
Depreciation and amortization	—			25.2			1.5			—			26.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.3			71.4			6.5			(2.0		)	79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	—			2.5			—			—			2.5
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	3.3			73.8			6.5			(2.0		)	81.6
Other operating charges, net	—			2.8			—			—			2.8
Total costs and expenses	3.3			842.9			78.3			(58.3		)	866.2
Operating (loss) income	(3.3		)	134.0			2.3			(0.5		)	132.5
Other (expense) income:
Interest (expense) income	(15.9		)	1.1			—			0.1			(14.7		)
Other (expense) income, net	(11.1		)	0.6			0.2			(0.1		)	(10.4		)
(Loss) income before income taxes	(30.3		)	135.7			2.5			(0.5		)	107.4
Income tax provision	—			(51.1		)	(0.7		)	11.6			(40.2		)
Earnings in equity of subsidiaries	97.5			1.3			—			(98.8		)	—
Net income	$	67.2		$	85.9		$	1.8		$	(87.7	)	$	67.2
Comprehensive income	$	70.1		$	88.7		$	1.9		$	(90.6	)	$	70.1

37

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$	(12.8	)	$	137.4		$	6.9		$	—		$	131.5
Cash flows from investing activities:
Capital expenditures	—			(55.7		)	(0.4		)	—			(56.1		)
Purchase of available for sale securities	—			(196.0		)	—			—			(196.0		)
Proceeds from disposition of available for sale securities	—			237.2			—			—			237.2
Proceeds from disposal of property, plant and equipment	—			0.6			—			—			0.6
Intercompany loans receivable	110.4			—			(5.6		)	(104.8		)	—
Net cash provided by (used in) investing activities	110.4			(13.9		)	(6.0		)	(104.8		)	(14.3		)
Cash flows from financing activities:
Repayment of capital lease	—			(0.2		)	—			—			(0.2		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(4.5		)	—			—			—			(4.5		)
Repurchase of common stock	(66.7		)	—			—			—			(66.7		)
Cash dividends and dividend equivalents paid	(26.4		)	—			—			—			(26.4		)
Intercompany loans payable	—			(104.8		)	—			104.8			—
Net cash used in financing activities	(97.6		)	(105.0		)	—			104.8			(97.8		)
Net increase in cash, cash equivalents and restricted cash during the period	—			18.5			0.9			—			19.4
Cash, cash equivalents and restricted cash at beginning of period	—			65.1			2.6			—			67.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	83.6		$	3.5		$	—		$	87.1

38

KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries				Consolidating Adjustments				Consolidated
Cash flows from operating activities:
Net cash provided by operating activities	$	189.7		$	109.3		$	8.4			$	(200.0	)		$	107.4
Cash flows from investing activities:
Capital expenditures	—			(55.6		)	(1.8		)		—				(57.4		)
Purchase of available for sale securities	—			(201.1		)	—				—				(201.1		)
Proceeds from disposition of available for sale securities	—			30.0			—				—				30.0
Intercompany loans receivable1	(205.6		)	106.0			(3.7		)		103.3				—
Net cash (used in) provided by in investing activities	(205.6		)	(120.7		)	(5.5		)		103.3				(228.5		)
Cash flows from financing activities:
Repayment of principal and redemption premium of 8.25% Senior Notes	(206.0		)	—			—				—				(206.0		)
Issuance of 5.875% Senior Notes	375.0			—			—				—				375.0
Cash paid for debt issuance costs	(6.8		)	—			—				—				(6.8		)
Proceeds from stock option exercises	1.0			—			—				—				1.0
Repayment of capital lease	—			—			(0.1		)		—				(0.1		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.8		)	—			—				—				(2.8		)
Repurchase of common stock	(13.6		)	—			—				—				(13.6		)
Cash dividends and dividend equivalents paid	(24.4		)	—			—				—				(24.4		)
Cash dividends paid to Parent	—			(200.0		)	—				200.0				—
Intercompany loans payable1	(106.5		)	209.3			0.5				(103.3		)		—
Net cash provided by financing activities	15.9			9.3			0.4			—	96.7			—	122.3
Net (decrease) increase in cash, cash equivalents and restricted cash during the period	—			(2.1		)	3.3				—				1.2
Cash, cash equivalents and restricted cash at beginning of period	—			83.0			0.7				—				83.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	80.9		$	4.0			$	—			$	84.9

________________

¹  As a result of the Parent's additional liquidity associated with the 5.875% Senior Notes (see Note 3), we classify all intercompany receivables and payables as Intercompany loans receivable and Intercompany loans payable, respectively, and therefore categorize changes in these balances within the investing and financing sections, respectively, of the Condensed Consolidating Statement of Cash Flows.

16. Subsequent Events

Dividend Declaration. On October 12, 2017, we announced that our Board of Directors declared a cash dividend of $0.50 per common share. As such, we expect to pay approximately $8.5 million (including dividend equivalents) on or about November 15, 2017 to stockholders of record and the holders of certain restricted stock units at the close of business on October 25, 2017.

39

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: (i) the effectiveness of management's strategies and decisions; (ii) general economic and business conditions, including cyclicality and other conditions in the aerospace, automotive and other end market applications we serve; (iii) developments in technology; (iv) new or modified statutory or regulatory requirements; and (v) changing prices and market conditions. This Item, Part II, Item 1A. "Risk Factors" included in this Report and Part I, Item 1A. "Risk Factors" included in our Annual Report on Form 10-K for the year ended December 31, 2016 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 September 30, 2017;

• Results of Operations;

• Liquidity and Capital Resources;

• Contractual Obligations, Commercial Commitments and Off-Balance-Sheet 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 included in Part I, Item 1. "Financial Statements" of 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, 2016.

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 gains or losses on derivatives related to fluctuations in underlying metal and energy prices and currency exchange rates, lower of cost or market inventory write-downs, non-cash impairments, the impact of discount rate changes on workers' compensation liabilities, legacy environmental expenses related to predecessor operations and gains or losses 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 remain neutral to the impact from fluctuations in the market price for aluminum, thereby earning profit predominately from the conversion of aluminum into semi-fabricated mill products. We refer to this as metal price neutrality. We purchase primary and scrap, or recycled, aluminum, our main raw material, at prices that fluctuate on a monthly basis, and our pricing policies generally allow us to pass the underlying cost of metal through to our customers so that we remain neutral to metal pricing. For some of our higher value added revenue products sold on a spot basis,

40

however, the pass through of metal price movements can lag by several months, with a favorable impact to us when metal prices decline and an adverse impact to us when metal prices increase. Additionally, we sometimes enter into firm-price customer sales agreements that specify a firm underlying metal price plus a conversion price. Spot sales with lagged metal price metal price pass through and firm-price sales agreements create metal price exposure for us, which we mitigate through a hedging program with an objective to remain metal price neutral.

Our pricing policies and hedging program are intended to significantly reduce or eliminate the impact on our profitability of fluctuations in underlying metal price so that our earnings are predominantly associated with the conversion of aluminum to semi-fabricated mill products. To allow users of our financial statements to consider the impact of metal cost on our Net sales, we disclose Net sales as well as value added revenue, which is Net sales less the Hedged Cost of Alloyed Metal. The Hedged Cost of Alloyed Metal is the cost of our metal inputs at the Midwest Transaction Price of aluminum ("Midwest Price") plus the cost of alloying elements and any realized gains and/or losses on settled hedges related to the metal sold in the referenced period. The Midwest Price reflects supply and demand dynamics for primary aluminum in North America. For a reconciliation of value added revenue to Net sales, see "Results of Operations - Segment and Business Unit Information" below.

Overview

We manufacture and sell semi-fabricated specialty aluminum mill products for the following end market applications: aerospace and high strength ("Aero/HS products"); automotive ("Automotive Extrusions"); general engineering ("GE products"); and other industrial ("Other products"). Our fabricated aluminum mill products include flat-rolled (plate and sheet), extruded (rod, bar, hollows and shapes), drawn (rod, bar, pipe, tube and wire) and certain cast aluminum products. The sophistication of our products is due to the metallurgy and physical properties of the metal and the special characteristics that are required for particular end uses. We strategically choose to serve technically challenging applications for which we can deploy our core metallurgical and process technology capabilities to produce highly engineered mill products with differentiated characteristics that present opportunities for us to receive premium pricing and to create long-term profitable growth.

With respect to the global market for flat-rolled aluminum mill products, our focus is on heat treat plate and sheet for applications that require higher strength and other desired product attributes that cannot be achieved by common alloy rolled products. The primary end market applications of flat-rolled heat treat plate and sheet are Aero/HS products (which we sell globally) and GE products (which we predominantly sell within North America). Similarly, in the areas of aluminum extrusions, we focus on demanding Aero/HS products, Automotive Extrusions and GE products that require high strength, machinability or other specific properties where we can create and maintain a defensible competitive position because of our technical expertise, strong production capability and high product quality. We primarily serve North American demand for extruded mill products.

Our rolling mill in Spokane, Washington ("Trentwood") produces heat treat plate and sheet for aerospace and general engineering end market applications. Our 11 extrusion/drawing facilities, 10 of which are in the United States and one of which is in Canada, serve aerospace, automotive or general engineering applications. Our consolidated Net sales for the nine months endedSeptember 30, 2017, totaled $1,044.4 million on 472.7 million pounds shipped from these 12 focused facilities. We employed approximately 2,740 people at September 30, 2017.

We have long-standing relationships with our customers, which consist primarily of blue-chip companies including leading aerospace and automotive manufacturers, tier one aerospace and automotive suppliers and metal service centers. Approximately 50% of our shipments is sold direct to the manufacturers or tier one suppliers and approximately 50% is sold to metal service centers. In our served markets, we seek to be the supplier of choice by pursuing "Best in Class" customer satisfaction driven by quality, availability, service and delivery performance. We strive to differentiate our product portfolio through our broad product offering and our KaiserSelect^® products, which are engineered and manufactured to deliver enhanced product characteristics with improved consistency, so as to result in better performance, lower waste and, in many cases, lower production cost for our customers.

Overall, the aerospace and defense industries' consumption of fabricated aluminum products is driven by factors that include levels of airframe build rates, the mix of aircraft models being built and defense spending. Unanticipated changes in build rates and mix of aircraft models being built can trigger re-stocking or de-stocking throughout the long aerospace supply chain, temporarily impacting demand for our Aero/HS products. Growth in demand for aerospace plate has exceeded demand growth for other forms of Aero/HS products as aircraft manufacturers have migrated to monolithic component design, where a single

41

piece of aluminum, usually a plate, is heavily machined to form a desired part rather than creating the same part by assembling sub-components made of aluminum sheet, extrusions or forgings that are affixed to one another using rivets, bolts or welds. As more applications convert to monolithic design, we expect aerospace plate demand to continue to grow at a pace higher than our other Aero/HS products.

Demand for Automotive Extrusions is determined based upon automotive build rates in North America, increasing aluminum content by platform and consumer preference. In recent years, automotive original equipment manufacturers ("OEMs") and their suppliers have been converting many automotive components that historically were made of steel to aluminum to decrease weight without 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 tier one automotive suppliers.

Demand growth and cyclicality for GE products tend to mirror broad economic patterns and industrial activity in North America. Demand is also impacted by the destocking and restocking of inventory throughout the supply chain.

Highlights of the quarter ended September 30, 2017 include:

• Shipment increase compared to the quarter and nine months ended September 30, 2016 driven by strong demand for GE products and Automotive Extrusions, partially offset by the impact of continued aerospace supply chain destocking and a slower-than-anticipated ramp-up of new equipment and automated controls at Trentwood;

• Compressed sales margins due to competitive pricing pressure;

• Strong operational performance across our manufacturing platform;

• Combined cash and cash equivalents, short-term investments and net borrowing availability under our Revolving Credit Facility of approximately $551.9 million as of September 30, 2017;

• Cash dividend and dividend equivalents payment of $8.5 million; and

• Repurchase of 18,321 shares of our common stock for $1.7 million at a weighted average price of $95.13.

Results of Operations

Consolidated Results of Operations

Net Sales. Net sales totaled $332.8 million and $320.6 million for the quarters ended September 30, 2017 and September 30, 2016, respectively, reflecting a 1%increase in Fabricated Products segment shipment volume and a 3%increase in average realized sales price per pound. Fabricated Products segment shipment volume increased due primarily to: (i) a 1.9 million pound, or 8%, increase in Automotive Extrusions driven by significantly higher shipments for bumper programs and (ii) a 1.3 million pound, or 2%, increase in GE products reflecting the continued solid underlying demand for our GE applications, partially offset by a 2.1 million pound, or 4%, decrease in Aero/HS products due to aerospace supply chain destocking and a slower-than-anticipated ramp-up of newly installed equipment and controls at Trentwood. The increase in average realized sales price per pound reflected a $0.13/lb, or 15%, increase in average Hedged Cost of Alloyed Metal prices per pound, partially offset by a $0.07/lb, or 5%, decrease in average value added revenue per pound. The decrease in average value added revenue per pound reflected: (i) competitive price pressure on spot sales of Aero/HS products and (ii) a leaner value added product mix with less volume of Aero/HS products and more volume of Automotive Extrusions and GE products. See the table in "Segment and Business Unit Information" below for further details.

Net sales totaled $1,044.4 million and $998.7 million for the nine months endedSeptember 30, 2017 and September 30, 2016, respectively, reflecting a 2% increase in Fabricated Products segment shipment volume and a 2% increase in average realized sales price per pound. Fabricated Products segment shipment volume increased due primarily to: (i) a 12.6 million

42

pound, or 7%, increase in GE products reflecting the continued solid underlying demand for our GE applications and (ii) a 5.1 million pound, or 7%, increase in Automotive Extrusions primarily related to significantly higher bumper shipments, partially offset by a 6.4 million pound, or 4%, decrease in Aero/HS products due to: (i) aerospace supply chain destocking and (ii) temporary plate capacity constraints due to the installation of new equipment and controls at Trentwood in the second quarter of 2017 and the slower-than-anticipated ramp-up of newly installed Trentwood equipment and automation in the third quarter of 2017. The increase in average realized sales price per pound reflected a $0.12/lb, or 14%, increase in average Hedged Cost of Alloyed Metal prices per pound, partially offset by a $0.07/lb, or 5%, decrease in average value added revenue per pound. The decrease in average value added revenue per pound reflected competitive price pressure on spot sales of Aero/HS and GE products and, as discussed above, a leaner value added product mix. See the table in "Segment and Business Unit Information" below for further details.

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.

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 endedSeptember 30, 2017 totaled $267.2 million, or 80% of Net sales, compared to $254.7 million, or 79% of Net sales, for the quarter endedSeptember 30, 2016. The increase of $12.5 million was comprised of a $21.1 million increase in Hedged Cost of Alloyed Metal, partially offset by a $8.6 million reduction in net manufacturing conversion and other costs. The reduction in net manufacturing conversion and other costs reflected: (i) a $3.3 million improvement in raw material costs due to favorable scrap pricing and usage; (ii) $1.3 million of lower planned major maintenance expense; and (iii) a $5.1 million decrease in manufacturing, LIFO and other costs, partially offset by a $1.1 million increase in costs related to product mix. Of the $21.1 million increase in Hedged Cost of Alloyed Metal, $20.1 million was due to higher hedged metal prices and $1.0 million was due to higher shipment volume, as discussed in "Net Sales" above.

Cost of products sold, excluding depreciation and amortization and other items for the nine months endedSeptember 30, 2017 totaled $822.7 million, or 79% of Net sales, compared to $767.1 million, or 77% of Net sales, for the nine months endedSeptember 30, 2016. The increase of $55.6 million was comprised of a $65.1 million increase in Hedged Cost of Alloyed Metal, partially offset by a $9.5 million reduction in net manufacturing conversion and other costs. The reduction in net manufacturing conversion and other costs reflected: (i) a $9.3 million improvement in raw material costs due to favorable scrap pricing and usage; (ii) $1.1 million of lower planned major maintenance expense; and (iii) a $3.4 million decrease in manufacturing, LIFO and other costs, partially offset by a $4.5 million increase in costs related to higher shipment volume and product mix. Of the $65.1 million increase in Hedged Cost of Alloyed Metal, $56.7 million was due to higher hedged metal prices and $8.4 million was due to higher shipment volume, as discussed in "Net Sales" above. See "Segment and Business Unit Information" below for a further discussion of the comparative results of operations for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016.

Lower of Cost or Market Inventory Write-Down. See Note 1 of Notes to Interim Consolidated Financial Statements included in this Report for information on our inventory lower of cost or market value adjustments.

Selling, General, Administrative, Research and Development ("SG&A and R&D"). SG&A and R&D expense totaled $24.7 million and $25.6 million for the quarters ended September 30, 2017 and September 30, 2016, respectively. The decrease was due primarily to a decrease in short-term incentive compensation expense based on performance factors and modifiers.

SG&A and R&D expense totaled $74.7 million and $79.2 million for the nine months endedSeptember 30, 2017 and September 30, 2016, respectively. The decrease was due primarily to a $3.9 million decrease in short-term incentive compensation expense based on performance factors and modifiers and a decrease in professional fees and services of $0.6 million.

Net Periodic Postretirement Benefit Cost Relating to Salaried VEBA. See Note 6 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding the Salaried VEBA and net periodic postretirement benefit cost relating thereto.

Goodwill Impairment. See Note 4 of Notes to Interim Consolidated Financial Statements included in this Report for details.

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Interest Expense. Interest expense represents cash and non-cash interest expense incurred on our 5.875% unsecured senior notes due May 15, 2024 ("5.875% Senior Notes"), our 8.25% unsecured senior notes, which were redeemed on June 1, 2016, and our revolving credit facility, net of capitalized interest. Interest expense was $5.3 million and $5.5 million for the quarters ended September 30, 2017 and September 30, 2016, respectively, net of $0.7 million and $0.6 million of interest expense capitalized as part of construction in progress, respectively.

Interest expense was $16.4 million and $14.7 million for the nine months endedSeptember 30, 2017 and September 30, 2016, respectively, net of $1.9 million and $2.4 million of interest expense capitalized as part of construction in progress, respectively.

Other Income (Expense), Net. See Note 13 of Notes to Interim Consolidated Financial Statements included in this Report for details.

Income Tax Provision. See Note 5 of Notes to Interim Consolidated Financial Statements included in this Report for disclosure regarding our income tax provision.

Segment and Business Unit Information

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 September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Segment operating income	$	53.7		$	42.1		$	149.9		$	172.1
Impact to segment operating income of non-run-rate items:
Adjustments to plant-level LIFO1	(2.0		)	(4.1		)	(3.9		)	(2.2		)
Mark-to-market gain on derivative instruments	10.8			2.0			14.0			16.9
Non-cash lower of cost or market inventory write-down2	—			—			—			(4.9		)
Workers' compensation cost due to discounting	0.1			(0.1		)	(0.1		)	—
Goodwill impairment3	—			—			(18.4		)	—
Asset impairment charges3	—			(2.7		)	—			(2.8		)
Environmental expenses	(0.2		)	—			(0.2		)	—
Total non-run-rate items	8.7			(4.9		)	(8.6		)	7.0
Segment operating income excluding non-run-rate items	$	45.0		$	47.0		$	158.5		$	165.1

_____________________

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 nine months endedSeptember 30, 2016 was due primarily to a decrease in our net realizable value of inventory (less a normal profit margin).

³  See Note 4 of Notes to Interim Consolidated Financial Statements included in this Report for additional information relating to the impairment of goodwill and one of our customer relationship intangible assets.

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As noted above, segment operating income excluding non-run-rate items for the quarter endedSeptember 30, 2017 was $2.0 millionlower than segment operating income excluding such items for the quarter endedSeptember 30, 2016. Lower operating income excluding non-run-rate items reflected: (i) a $10.2 million unfavorable sales impact due primarily to a leaner product mix and lower sales margins, as discussed above and (ii) $1.3 million of higher depreciation and amortization expense, partially offset by: (i) a $3.3 million improvement from favorable price spreads for scrap raw material purchases; (ii) $1.3 million of lower planned major maintenance expense; and (iii) a $4.8 million improvement in net manufacturing conversion and other costs.

Segment operating income excluding non-run-rate items for the nine months endedSeptember 30, 2017 was $6.6 millionlower than segment operating income excluding such items for the nine months endedSeptember 30, 2016. Lower operating income excluding non-run-rate items reflected: (i) a $23.9 million unfavorable sales impact due primarily to a leaner product mix and lower sales margins, as discussed above and (ii) $2.7 million of higher depreciation and amortization expense, partially offset by: (i) a $9.3 million improvement from favorable price spreads for scrap raw material purchases; (ii) a $7.8 million improvement in net manufacturing conversion and other costs; (iii) $1.1 million of lower planned major maintenance expense; and (iv) a $1.8 million decrease in incentive compensation expense based on performance factors and modifiers.

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The table below provides our Fabricated Products segment shipment and value added revenue information (in millions of dollars, except shipments and value added revenue per pound) by end market applications for each period presented:

	Quarter Ended September 30,												Nine Months Ended September 30,
	2017						2016						2017						2016
Aero/HS Products:
Shipments (mmlbs)	53.4						55.5						172.8						179.2
	$			$ / lb			$			$ / lb			$			$ / lb			$			$ / lb
Net sales	$	150.2		$	2.81		$	156.1		$	2.81		$	483.2		$	2.80		$	500.7		$	2.79
Less: Hedged Cost of Alloyed Metal	(51.8		)	(0.97		)	(47.5		)	(0.85		)	(162.7		)	(0.95		)	(152.7		)	(0.85		)
Value added revenue	$	98.4		$	1.84		$	108.6		$	1.96		$	320.5		$	1.85		$	348.0		$	1.94
Automotive Extrusions:
Shipments (mmlbs)	24.5						22.6						75.9						70.8
	$			$ / lb			$			$ / lb			$			$ / lb			$			$ / lb
Net sales	$	52.7		$	2.15		$	46.5		$	2.06		$	161.6		$	2.13		$	143.6		$	2.03
Less: Hedged Cost of Alloyed Metal	(23.8		)	(0.97		)	(18.9		)	(0.84		)	(72.9		)	(0.96		)	(58.0		)	(0.82		)
Value added revenue	$	28.9		$	1.18		$	27.6		$	1.22		$	88.7		$	1.17		$	85.6		$	1.21
GE Products:
Shipments (mmlbs)	64.1						62.8						203.1						190.5
	$			$ / lb			$			$ / lb			$			$ / lb			$			$ / lb
Net sales	$	115.9		$	1.81		$	105.6		$	1.68		$	361.1		$	1.78		$	318.3		$	1.67
Less: Hedged Cost of Alloyed Metal	(63.3		)	(0.99		)	(52.6		)	(0.84		)	(195.9		)	(0.97		)	(157.9		)	(0.83		)
Value added revenue	$	52.6		$	0.82		$	53.0		$	0.84		$	165.2		$	0.81		$	160.4		$	0.84
Other Products:
Shipments (mmlbs)	7.6						7.4						20.9						22.1
	$			$ / lb			$			$ / lb			$			$ / lb			$			$ / lb
Net sales	$	14.0		$	1.84		$	12.4		$	1.68		$	38.5		$	1.84		$	36.1		$	1.63
Less: Hedged Cost of Alloyed Metal	(7.4		)	(0.97		)	(6.2		)	(0.84		)	(20.3		)	(0.97		)	(18.1		)	(0.82		)
Value added revenue	$	6.6		$	0.87		$	6.2		$	0.84		$	18.2		$	0.87		$	18.0		$	0.81
Total:
Shipments (mmlbs)	149.6						148.3						472.7						462.6
	$			$ / lb			$			$ / lb			$			$ / lb			$			$ / lb
Net sales	$	332.8		$	2.22		$	320.6		$	2.16		$	1,044.4		$	2.21		$	998.7		$	2.16
Less: Hedged Cost of Alloyed Metal	(146.3		)	(0.97		)	(125.2		)	(0.84		)	(451.8		)	(0.96		)	(386.7		)	(0.84		)
Value added revenue	$	186.5		$	1.25		$	195.4		$	1.32		$	592.6		$	1.25		$	612.0		$	1.32

For the quarter ended September 30, 2017, Net sales of Fabricated Products increased by 4% to $332.8 million, as compared to the quarter ended September 30, 2016, reflecting a 1%increase in Fabricated Products segment shipment volume and a 3%increase in average realized sales price per pound, as discussed in further detail above in "Consolidated Results of Operations."

For the nine months endedSeptember 30, 2017, Net sales of Fabricated Products increased by 5% to $1,044.4 million, as compared to the nine months endedSeptember 30, 2016, reflecting a 2%increase in Fabricated Products segment shipment

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volume and a 2%increase in average realized sales price per pound, as discussed in further detail above in "Consolidated Results of Operations."

Outlook

While our 2017 outlook for Automotive Extrusions and GE products remains unchanged, we have lowered the outlook for our Aero/HS products due to constraints on throughput during installation and ramp-up of new equipment and automated controls at Trentwood. For Automotive Extrusions, we continue to expect double-digit year-over-year growth in shipments and mid-single-digit growth in value added revenue as new product growth is predominantly in lower value added parts. As we have previously noted for our Aero/HS products, we anticipate headwinds from lower sales margins and commercial aerospace supply chain destocking will continue through the remainder of the year. While we had previously anticipated our Aero/HS products shipments would be comparable to 2016, we now expect our 2017 Aero/HS shipments will be lower than the prior year due to the slower-than-anticipated Trentwood ramp-up.

Longer term, we continue to anticipate solid Aero/HS products demand growth driven by military and commercial aircraft applications in both 2018 and 2019, with isolated instances of the supply chain inventory overhang lingering into 2018 to create a modest drag on overall industry demand growth. As demand strengthens and we implement the improved manufacturing practices and capacity expansion at Trentwood, we expect increasing benefits from the new equipment and automated controls at Trentwood. Overall, we expect to enter 2018 well positioned to serve industry-wide demand growth across our served markets.

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 September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Operating loss	$	(13.9	)	$	(12.3	)	$	(39.2	)	$	(39.6	)
Impact to operating loss of non-run-rate items:
Net periodic post retirement benefit cost relating to Salaried VEBA	(1.2		)	(0.8		)	(3.4		)	(2.5		)
(Loss) gain on removal of Union VEBA net assets	(0.5		)	—			0.8			0.1
Total non-run-rate items	(1.7		)	(0.8		)	(2.6		)	(2.4		)
Operating loss excluding non-run-rate items	$	(12.2	)	$	(11.5	)	$	(36.6	)	$	(37.2	)

All Other operating loss excluding non-run-rate items for the quarter ended September 30, 2017 was $0.7 millionhigher for the same period in 2016. The increase was due primarily to an increase in workers' compensation expense and other general and administrative expenses.

All Other operating loss excluding non-run-rate items for the nine months endedSeptember 30, 2017, was $0.6 millionlower than the comparable prior period in 2016 due primarily to a decrease in employee incentive compensation expense.

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Liquidity and Capital Resources

Summary

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

	September 30, 2017		December 31, 2016
Available cash and cash equivalents	$	73.9	$	55.2
Short-term investments	191.4		231.0
Net borrowing availability under Revolving Credit Facility after letters of credit	286.6		275.3
Total liquidity	$	551.9	$	561.5

Cash equivalents consist primarily of money market accounts and investments which, when purchased, have a maturity of 90 days or less. 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 with a maturity at the time of purchase of greater than 90 days.

In addition to our unrestricted cash and cash equivalents described above, we had restricted cash of $13.2 million at September 30, 2017 that was pledged or held as collateral in connection with workers' compensation requirements and certain other agreements. Of this amount, $0.3 million and $12.9 million were included in Prepaid expenses and other current assets and Other assets, respectively. From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash.

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 September 30, 2017, or as of December 31, 2016.

Cash Flows

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

	Nine Months Ended September 30,
	2017			2016
Total cash provided by (used in):
Operating activities:
Fabricated Products	$	194.3		$	158.8
All Other	(62.8		)	(51.4		)
Total cash provided by operating activities	$	131.5		$	107.4
Investing activities:
Fabricated Products	$	(55.4	)	$	(57.2	)
All Other	41.1			(171.3		)
Total cash used in investing activities	$	(14.3	)	$	(228.5	)
Financing activities:
Fabricated Products	$	(0.2	)	$	(0.1	)
All Other	(97.6		)	122.4
Total cash (used in) provided by financing activities	$	(97.8	)	$	122.3

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Operating Activities

Fabricated Products – For the nine months endedSeptember 30, 2017, Fabricated Products segment operating activities provided $194.3 million of cash. Cash provided in the nine months endedSeptember 30, 2017 was primarily related to: (i) $149.9 million of operating income; (ii) depreciation and amortization of $28.9 million; (iii) goodwill impairment of $18.4 million; and (iv) an increase in accounts payable of $21.7 million driven predominantly by the timing of metal purchases. Cash provided by operating activities was partially offset by: (i) adjustments for other non-cash items of $11.3 million; (ii) an increase in inventory of $10.6 million; and (iii) an increase in trade and other receivables of $0.9 million.

Fabricated Products segment operating activities provided $158.8 million of cash during the nine months endedSeptember 30, 2016. Cash provided in the nine months endedSeptember 30, 2016 was primarily related to: (i) $172.1 million of operating income; (ii) depreciation and amortization of $26.2 million; (iii) a lower of cost or market inventory write-down of $4.9 million; and (iv) a net decrease in other operating assets and liabilities of $2.0 million. Cash provided by operating activities was partially offset by: (i) an increase in accounts receivable of $26.6 million due primarily to the timing of sales and increase in metal price; (ii) adjustments for other non-cash items of $13.4 million; and (iii) an increase in inventory of $8.9 million.

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 $62.8 million during the nine months endedSeptember 30, 2017 consisted primarily of payments relating to: (i) general and administrative costs of $24.2 million; (ii) an annual variable cash contribution to the VEBAs of $20.0 million with respect to the 2016 year; (iii) our short-term incentive program in the amount of $6.7 million; and (iv) interest on the 8.25% Senior Notes and Revolving Credit Facility of $11.9 million.

Cash used in operating activities of $51.4 million during the nine months endedSeptember 30, 2016 consisted primarily of payments relating to: (i) general and administrative costs of $19.2 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 5.875% and 8.25% Senior Notes and Revolving Credit Facility of $9.1 million.

Investing Activities

Fabricated Products – Cash used in investing activities for the Fabricated Products segment during the nine months endedSeptember 30, 2017 was $55.4 million, compared to $57.2 million of cash used during the nine months endedSeptember 30, 2016. Cash used during the nine months endedSeptember 30, 2017 primarily consisted of capital expenditures of $55.9 million, partially offset by net proceeds from the disposal of property, plant and equipment of $0.6 million. Cash used during the nine months endedSeptember 30, 2016 was primarily related to capital expenditures.

All Other – Cash provided by investing activities for All Other was $41.1 million during the nine months endedSeptember 30, 2017 and primarily consisted of proceeds from the disposition of available for sale securities of $237.2 million, partially offset by purchases of available for sale securities of $195.9 million and capital expenditures of $0.2 million. Cash used in investing activities for All Other during the nine months endedSeptember 30, 2016 was $171.3 million and primarily consisted of purchases of available for sale securities of $200.9 million and capital expenditures of $0.4 million, partially offset by proceeds from the disposition of available for sale securities of $30.0 million.

Financing Activities

Fabricated Products – Cash used in financing activities was insignificant during the nine months endedSeptember 30, 2017 and September 30, 2016.

All Other – Cash used in financing activities during the nine months endedSeptember 30, 2017 was $97.6 million, representing: (i) $66.7 million of cash used to repurchase our common stock under our stock repurchase program; (ii) $26.4 million of cash dividends paid to stockholders, including the holders of restricted stock, and in dividend equivalents to the holders of certain restricted stock units and performance shares; and (iii) $4.5 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.

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Cash provided by financing activities during the nine months endedSeptember 30, 2016 was $122.4 million, representing $375.0 million in proceeds from the issuance of our 5.875% Senior Notes and $1.0 million in proceeds from the exercise of stock options, partially offset by: (i) $206.0 million for the repayment of the 8.25% Senior Notes; (ii) $24.4 million of cash dividends paid to stockholders, including the holders of restricted stock, and in dividend equivalents to the holders of certain restricted stock units and performance shares; (iii) $13.6 million of cash used to repurchase our common stock under our stock repurchase program; (iv) $6.8 million of debt issuance costs; and (v) $2.8 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.

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. While we believe these sources will be sufficient to finance our working capital requirements, planned capital expenditures and investments, debt service obligations and other cash requirements for at least the next twelve months, our ability to fund such cash requirements 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), of which up to a maximum of $20.0 million may be utilized for letters of credit. The Revolving Credit Facility may, subject to certain conditions and the agreement of lenders thereunder, be increased to $400.0 million.

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

	October 16, 2017			September 30, 2017
Revolving Credit Facility borrowing commitment	$	300.0		$	300.0
Borrowing base availability	$	290.9		$	294.4
Less: Outstanding borrowings under Revolving Credit Facility	—			—
Less: Outstanding letters of credit under Revolving Credit Facility	(7.8		)	(7.8		)
Net remaining borrowing availability	$	283.1		$	286.6
Borrowing rate (if applicable)1	4.50		%	4.50		%

_______________________

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, 2016 for information regarding our Revolving Credit Facility.

Debt

See "Contractual Obligations, Commercial Commitments and Off-Balance Sheet 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, 2016 for mandatory principal and cash interest payments on the outstanding borrowings.

We do not believe that covenants in the indenture governing the 5.875% 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.

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Capital Expenditures and Investments

In anticipation of an increasingly competitive market environment, we strategically allocate our capital spending on projects to maintain and improve our competitive position. Objectives are to target significant improvement in our manufacturing cost efficiency and product quality. Capacity expansion typically is an additional benefit of most projects focused on cost and quality.

The most significant strategic capital project in 2017 is our Trentwood efficiency and modernization initiative, a multi-year, $150.0 million capital investment initiative that upgrades equipment throughout the Trentwood process flow to increase efficiency and further improve our competitive cost position on all of Trentwood's products. A significant portion of this investment will focus on modernizing our legacy equipment and process flow for thin gauge plate to achieve KaiserSelect® quality enhancements for both Aero/HS and GE products. Besides efficiency and quality improvements, upgrades completed during 2017 will also position Trentwood with additional manufacturing capacity to address anticipated sales growth in 2018 and beyond. The Trentwood efficiency and modernization initiative was announced in December 2015 and as of September 30, 2017 approximately half of the $150.0 million had been spent.

Total capital expenditures were $56.1 million and $57.4 million for the nine months endedSeptember 30, 2017 and September 30, 2016, respectively. For the full year of 2017, we anticipate capital spending will be approximately $80.0 million. 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.

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 nine months endedSeptember 30, 2017 and September 30, 2016, and declared subsequent to September 30, 2017.

We have consistently paid a quarterly cash dividend since the second quarter of 2007 to holders of our common stock, including holders of restricted stock, and have increased the dividend in each year since 2011. Nevertheless, as in the past, 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 position and anticipated cash requirements and contractual restrictions under our revolving credit facility, the indenture for our 5.875% Senior Notes, 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, 2016 for additional information about restrictions on dividend payments contained in the Revolving Credit Facility and in the indenture for our 5.875% Senior Notes.

We also pay quarterly dividend equivalents to the holders of certain restricted stock units and performance shares. Holders of performance shares granted beginning in 2014 are not paid a quarterly dividend equivalent, but instead are entitled to receive, in connection with the issuance of underlying shares of common stock for performance shares that ultimately vest, a one-time payment equal to the dividends such holder would have received if the number of such shares of common stock so issued had been held of record by such holder from the date of grant of such performance shares through the date of such issuance.

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 nine months endedSeptember 30, 2017 and September 30, 2016 and the amounts authorized and available for future repurchases of common stock under our stock repurchase program.

See Note 7 of Notes to Interim Consolidated Financial Statements included in this Report for information regarding minimum statutory tax withholding obligations arising during the nine months endedSeptember 30, 2017 and September 30, 2016 in connection with the vesting of non-vested shares, restricted stock units and performance shares.

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Restrictions Related to Equity Capital

We have significant federal income tax attributes, including sizable net operating loss carryforwards. Under Section 382(l)(5) ("Section 382") of the Internal Revenue Code of 1986 ("Code"), our ability to use our federal income tax attributes following a more than 50% change in ownership during any period of 36 consecutive months, all as determined under the Code (an "ownership change") would be limited annually to an amount equal to the product of: (i) the aggregate value of our outstanding common shares immediately prior to the ownership change and (ii) the applicable federal long-term tax exempt rate in effect on the date of the ownership change.

To preserve our ability to fully use our net operating loss carryforwards and other significant tax attributes: (i) our amended certificate of incorporation maintains restrictions on transfers of our stock by any person who owns, or would become an owner of, 4.99% or more of our stock as determined under Section 382 and (ii) we have adopted a tax asset protection rights plan ("Tax Asset Rights Plan") designed to deter transfers of our common stock that could result in an ownership change pursuant to Section 382.

Environmental Commitments and Contingencies

See Note 8 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 Arrangements

During the nine months endedSeptember 30, 2017, we granted additional stock-based awards to certain members of management and our non-employee directors under our equity incentive plans (see Note 7 of Notes to Interim Consolidated Financial Statements included in this Report). Additional awards are expected to be made in future years.

Except as otherwise disclosed herein, there has been no material change in our contractual obligations, commercial commitments or off-balance sheet arrangements other than in the ordinary course of business since December 31, 2016.

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, 2016 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, 2016.

In January 2017, we prospectively adopted Accounting Standards Update ("ASU") No. 2017-04, Intangibles - Goodwill and Other(Topic 350): Simplifying the Test for Goodwill Impairment, which eliminates the second step of the two-step goodwill impairment test that required companies to determine the fair value of individual assets and liabilities of a reporting unit to measure a goodwill impairment. Furthermore, see Note 1 and Note 4 of Notes to Interim Consolidated Financial Statements included in this Report for a discussion of the carrying values of the goodwill and intangible asset related to our Chandler, Arizona (Extrusion) and Florence, Alabama (Drawing) facilities. There have been no other material changes in our critical accounting estimates and policies since December 31, 2016.

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New Accounting Pronouncements

For a discussion of 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, certain alloying metals, natural gas and electricity, and also depend to a significant degree upon the volume and mix of all products sold. As discussed more fully in Note 9 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.

Aluminum

See Note 9 of Notes to Interim Consolidated Financial Statements included in this Report for a discussion of our pricing of fabricated aluminum, firm-price arrangements and third-party hedging instruments. During the nine months endedSeptember 30, 2017 and September 30, 2016, settlements of derivative contracts covering 136.7 million pounds and 163.6 million pounds, respectively, hedged Fabricated Products shipments sold on pricing terms that created metal price risk for us. At September 30, 2017, we had derivative contracts with respect to approximately 47.1 million pounds, 76.4 million pounds, 24.7 million pounds and 1.0 million pounds to hedge sales to be made in the remainder of 2017, 2018, 2019, and each of 2020 and 2021, 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 LME market price of aluminum as of September 30, 2017 and December 31, 2016, with all other variables held constant, would have resulted in an unrealized mark-to-market loss of $15.0 million and $14.8 million, 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 would have resulted in an unrealized mark-to-market loss of $1.5 million as of both September 30, 2017 and December 31, 2016.

Alloying Metals

We are exposed to the risk of fluctuating prices of certain alloying metals, especially copper and zinc, to the extent that changes in their prices do not highly correlate with price changes for aluminum. Copper, zinc and certain other metals are used in our remelt operations to cast rolling ingot and extrusion billet with the proper chemistry for our products. From time to time, we enter into forward contract swaps with third parties to mitigate our risk from fluctuations in the prices of alloying metals, including copper and zinc. As of September 30, 2017, we had forward swap contracts with settlement dates designed to align with the timing of scheduled purchases of zinc and copper ("Alloy Hedges") by our manufacturing facilities. Our Alloy Hedges are designated and qualify as cash flow hedges. See Note 9 of Notes to Interim Consolidated Financial Statements included in this Report for additional information relating to these Alloy Hedges. We estimate that a $0.10 per pound decrease in the LME market price of zinc as of September 30, 2017 and December 31, 2016, with all other variables held constant, would have resulted in an unrealized mark-to market loss of $0.3 million and $0.4 million, respectively. We estimate that a $0.10 per pound decrease in the Commodity Exchange ("COMEX") market price of copper as of September 30, 2017, with all other variables

53

held constant, would have resulted in an unrealized mark-to market loss of $0.2 million, with corresponding changes to the net fair value of our Alloy Hedges.

Energy

We are exposed to risk of fluctuating prices for natural gas and electricity. 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 September 30, 2017, 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 72% of the expected natural gas purchases for the remainder of 2017, 71% of the expected natural gas purchases for both 2018 and 2019 and 39% of the expected natural gas purchases for 2020. We estimate that a $1.00 per mmbtu decrease in natural gas prices would have resulted in an unrealized mark-to-market loss of $3.7 million and $5.0 million on September 30, 2017 and December 31, 2016, respectively, with corresponding changes to the net fair value of our natural gas derivative positions.

Additionally, as of September 30, 2017, we had physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for the remainder of 2017, 55% of the expected electricity purchases for both 2018 and 2019 and 18% of the expected electricity purchases for 2020.

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 SEC'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 September 30, 2017 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 nine months endedSeptember 30, 2017 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

54

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, 2016 for information concerning material legal proceedings with respect to the Company. There have been no material developments since December 31, 2016.

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, 2016 for information concerning risk factors. There have been no material changes in risk factors since December 31, 2016.

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 September 30, 2017:

	Amended and Restated 2016 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
July 1, 2017 - July 31, 2017	—	$	—	7,571	$	91.57	$	124.5
August 1, 2017 - August 31, 2017	—	—		5,750	96.12		$	123.9
September 1, 2017 - September 30, 2017	—	—		5,000	99.40		$	123.4
Total	—	$	—	18,321	$	95.13	N/A

__________________________

¹  Under our equity incentive plans, 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. All such shares withheld by us were canceled 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 $123.4 million available for further share repurchases as of September 30, 2017, $23.4 million is part of the $100.0 million authorized in April 2015 and $100.0 million was authorized in April 2017. 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.

See Note 3 of Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2016 for information about restrictions on dividend payments contained in the Revolving Credit Facility and in the indenture for our 5.875% Senior Notes.

Item 3.Defaults Upon Senior Securities

None.

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Item 4. Mine Safety Disclosures

Not applicable.

Item 5.Other Information

None.

Item 6.Exhibits

Exhibit Number	Description
10.1	CEO Employment Agreement (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed by the Company on July 17, 2017, File No. 001-09447).
*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.

56

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: October 27, 2017

57

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
		Chief Executive Officer and Chairman
Date:	October 27, 2017

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:	October 27, 2017

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

October 27, 2017

In connection with the Quarterly Report on Form 10-Q by Kaiser Aluminum Corporation, a Delaware corporation (the “Company”), for the quarter ended September 30, 2017 (the “Report”), as filed on the date hereof with the Securities and Exchange Commission, the undersigned, Jack A. Hockema, Chief Executive Officer and Chairman 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

Chief Executive Officer and Chairman

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

October 27, 2017

In connection with the Quarterly Report on Form 10-Q by Kaiser Aluminum Corporation, a Delaware corporation (the “Company”), for the quarter ended September 30, 2017 (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	9 Months Ended
	Sep. 30, 2017	Oct. 16, 2017
Document Information [Line Items]
Entity Registrant Name	Kaiser Aluminum Corp
Entity Central Index Key	0000811596
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		16,903,791

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 73.9	$ 55.2
Short-term investments	191.4	231.0
Receivables:
Trade receivables, net	138.2	137.7
Other	15.4	11.9
Inventories	212.2	201.6
Prepaid expenses and other current assets	31.5	18.5
Total current assets	662.6	655.9
Property, plant and equipment, net	557.8	530.9
Deferred tax assets, net	118.7	159.7
Intangible assets, net	25.3	26.4
Goodwill	18.8	37.2
Other assets	39.5	33.4
Total	1,422.7	1,443.5
Current liabilities:
Accounts payable	94.4	75.8
Accrued salaries, wages and related expenses	39.0	49.1
Other accrued liabilities	43.3	40.1
Total current liabilities	176.7	165.0
Net liabilities of Salaried VEBA	27.8	28.6
Deferred tax liabilities	3.3	3.3
Long-term liabilities	61.9	73.2
Long-term debt	369.4	368.7
Total liabilities	639.1	638.8
Commitments and contingencies
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both September 30, 2017 and December 31, 2016; no shares were issued and outstanding at September 30, 2017 and December 31, 2016	0.0	0.0
Common stock, par value $0.01, 90,000,000 shares authorized at both September 30, 2017 and at December 31, 2016; 22,392,946 shares issued and 16,905,368 shares outstanding at September 30, 2017; 22,332,732 shares issued and 17,651,461 shares outstanding at December 31, 2016	0.2	0.2
Additional paid in capital	1,052.8	1,047.4
Retained earnings	109.0	75.2
Treasury stock, at cost, 5,487,578 shares at September 30, 2017 and 4,681,271 shares at December 31, 2016, respectively	(345.7)	(281.4)
Accumulated other comprehensive loss	(32.7)	(36.7)
Total stockholders' equity	783.6	804.7
Total	$ 1,422.7	$ 1,443.5

XML

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
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	22,392,946	22,332,732
Common stock, shares outstanding	16,905,368	17,651,461
Treasury stock, shares	5,487,578	4,681,271

XML

Statements of Consolidated Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 332.8	$ 320.6		$ 1,044.4	$ 998.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	267.2	254.7		822.7	767.1
Lower of cost or market inventory write-down	0.0	0.0	$ 4.9	0.0	4.9
Unrealized gain on derivative instruments	(10.8)	(2.0)		(14.0)	(16.9)
Depreciation and amortization	10.2	9.0		29.3	26.7
Selling, general, administrative, research and development	24.7	25.6		74.7	79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2	0.8		3.4	2.5
Loss (gain) on removal of Union VEBA net assets	0.5	0.0		(0.8)	(0.1)
Total selling, general, administrative, research and development	26.4	26.4		77.3	81.6
Goodwill impairment	0.0	0.0		18.4	0.0
Other operating charges, net	0.0	2.7		0.0	2.8
Total costs and expenses	293.0	290.8		933.7	866.2
Operating income	39.8	29.8		110.7	132.5
Other (expense) income:
Interest expense	(5.3)	(5.5)		(16.4)	(14.7)
Other (expense) income, net	1.5	0.0		3.1	(10.4)
Income before income taxes	36.0	24.3		97.4	107.4
Income tax provision	(16.1)	(9.4)		(36.8)	(40.2)
Net income	$ 19.9	$ 14.9		$ 60.6	$ 67.2
Net income per common share:
Basic (in dollars per share)	$ 1.18	$ 0.84		$ 3.55	$ 3.76
Diluted (in dollars per share)	$ 1.16	$ 0.82		$ 3.49	$ 3.70
Weighted-average number of common shares outstanding (in thousands):
Basic (shares)	16,834	17,841		17,072	17,858
Diluted (shares)	17,160	18,175		17,363	18,181
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.45		$ 1.50	$ 1.35

XML

Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 19.9	$ 14.9	$ 60.6	$ 67.2
Other Comprehensive Income (Loss), Net of Tax - Note 13:
Salaried VEBA and defined benefit pension plan	0.8	0.7	2.5	2.2
Available for sale securities	0.3	0.3	0.6	0.6
Other	0.5	0.1	0.9	0.1
Other comprehensive income, net of tax	1.6	1.1	4.0	2.9
Comprehensive income	$ 21.5	$ 16.0	$ 64.6	$ 70.1

XML

Statement of Consolidated Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Stockholders' Equity [Roll Forward]
Net income	$ 67.2
Repurchase of common stock (shares)	(170,304)
Repurchase of common stock	$ (13.8)
Ending balance at Sep. 30, 2016						$ (28.8)
Stockholders' Equity [Roll Forward]
Net income	$ 14.9
Ending balance at Sep. 30, 2016						(28.8)
Beginning balance, shares at Dec. 31, 2016	17,651,461	17,651,461
Beginning balance at Dec. 31, 2016	$ 804.7	$ 0.2	$ 1,047.4	$ 75.2	$ (281.4)	(36.7)
Stockholders' Equity [Roll Forward]
Net income	60.6			60.6
Other comprehensive income, net of tax	4.0					4.0
Issuance of non-vested shares to non-employee directors (shares)		11,817
Issuance of common shares to non-employee directors (shares)		2,282
Issuance of common shares to non-employee directors	0.2		0.2
Issuance of common shares to employees upon option exercises and vesting of restricted stock units and performance shares (shares)		102,737
Cancellation of employee non-vested shares (shares)		(427)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)		(56,195)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	$ (4.5)		(4.5)
Repurchase of common stock (shares)	(806,307)	(806,307)
Repurchase of common stock	$ (64.9)				(64.9)
Cancellation of treasury stock			(0.2)	(0.4)	0.6
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares	(26.4)			(26.4)
Amortization of unearned equity compensation	$ 9.9		9.9
Ending balance, shares at Sep. 30, 2017	16,905,368	16,905,368
Ending balance at Sep. 30, 2017	$ 783.6	$ 0.2	1,052.8	109.0	(345.7)	(32.7)
Stockholders' Equity [Roll Forward]
Net income	$ 19.9
Ending balance, shares at Sep. 30, 2017	16,905,368	16,905,368
Ending balance at Sep. 30, 2017	$ 783.6	$ 0.2	$ 1,052.8	$ 109.0	$ (345.7)	$ (32.7)

XML

Statement of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income		$ 60.6	$ 67.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment		28.3	25.5
Amortization of definite-lived intangible assets		1.0	1.2
Amortization of debt discount and debt issuance costs		0.9	0.8
Deferred income taxes		38.6	40.7
Non-cash equity compensation		10.1	8.8
Lower of cost or market inventory write-down		0.0	4.9
Gain on sale of available for sale securities		(1.8)	0.0
Non-cash unrealized gain on derivative instruments		(14.0)	(16.9)
Loss on extinguishment of debt		0.0	11.1
Non-cash intangible asset impairment charge		18.4	2.6
(Gain) loss on disposition of property, plant and equipment		(0.4)	0.2
Non-cash net periodic postretirement benefit cost relating to Salaried VEBA		3.4	2.5
Other non-cash changes in assets and liabilities		(0.8)	1.1
Changes in operating assets and liabilities:
Trade and other receivables		(4.0)	(26.7)
Inventories, excluding lower of cost or market write-down		(10.6)	(8.9)
Prepaid expenses and other current assets		(1.8)	(0.9)
Accounts payable		21.6	0.8
Accrued liabilities		0.9	27.9
Annual variable cash contributions to VEBAs		(20.0)	(19.5)
Long-term assets and liabilities, net		1.1	(15.0)
Net cash provided by operating activities		131.5	107.4
Cash flows from investing activities
Capital expenditures		(56.1)	(57.4)
Purchase of available for sale securities		(196.0)	(201.1)
Proceeds from disposal of property, plant and equipment		237.2	30.0
Proceeds from disposal of property, plant and equipment		0.6	0.0
Net cash used in investing activities	[1]	(14.3)	(228.5)
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes		0.0	(206.0)
Issuance of 5.875% Senior Notes		0.0	375.0
Cash paid for debt issuance costs		0.0	(6.8)
Proceeds from stock option exercises		0.0	1.0
Repayment of capital lease		(0.2)	(0.1)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(4.5)	(2.8)
Repurchase of common stock		(66.7)	(13.6)
Cash dividends and dividend equivalents paid		(26.4)	(24.4)
Net cash (used in) provided by financing activities	[1]	(97.8)	122.3
Net increase in cash, cash equivalents and restricted cash during the period		19.4	1.2
Cash, cash equivalents and restricted cash at beginning of period		67.7	83.7
Cash, cash equivalents and restricted cash at end of period		$ 87.1	$ 84.9

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

XML

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

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, 2016. 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 mill products, such as aluminum plate and sheet and extruded and drawn products, for the following end market applications: aerospace and high strength ("Aero/HS products"), automotive applications ("Automotive Extrusions"), general engineering ("GE products") and other industrial ("Other products"). 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 2017 fiscal year. The financial information as of December 31, 2016 is derived from our audited consolidated financial statements and footnotes included in our Annual Report on Form 10-K for the year ended December 31, 2016.

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 a lower of cost or market inventory write-down of $4.9 million as a result of a decrease in our net realizable value of inventory. 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. There were no additional lower of cost or market inventory adjustments since the quarter ended March 31, 2016.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At September 30, 2017, the current cost of inventory exceeded its stated LIFO value by $12.5 million. At December 31, 2016, the stated LIFO value of our inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $8.5 million. Other inventories are stated on the first-in, first-out basis and consist of operating supplies, which are materials and supplies to be consumed during the production process. Inventory costs consist of material, labor and manufacturing overhead, including depreciation. Abnormal costs, such as idle facility expenses, freight, handling costs and spoilage, are accounted for as current period charges. All of our inventories at September 30, 2017 and December 31, 2016 were included in the Fabricated Products segment (see Note 2 for the components of inventories).

Replacement Parts. Replacement parts consist of preventative maintenance and capital spare parts, which are stated on the first-in, first-out basis. Replacement parts are recorded within Prepaid expenses and other current assets or Other assets depending on whether or not the expected utilization of the replacement parts is to occur within the current operating cycle.

Property, Plant and Equipment, Net. Property, plant and equipment, net is recorded at cost and includes construction in progress (see Note 2). Interest related to the construction of qualifying assets is capitalized as part of the construction costs. The amount of interest expense capitalized as construction in progress was $0.7 million and $0.6 million during the quarters ended September 30, 2017 and September 30, 2016, respectively. The amount of interest expense capitalized as construction in progress was $1.9 million and $2.4 million during the nine months endedSeptember 30, 2017 and September 30, 2016, 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.

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.

Self Insurance of Workers' Compensation and Employee Healthcare Liabilities. We self-insure the majority of the costs of workers' compensation benefits and employee healthcare benefits and rely on insurance coverage to protect us from large losses on individual claims. Workers' compensation liabilities are based on a combination of estimates for: (i) incurred-but-not-reported claims and (ii) the ultimate expense of incurred claims. Such estimates are based on judgment, using our historical claims data and information and analysis provided by actuarial and claims advisors, our insurance carriers and other professionals. Our undiscounted workers' compensation liabilities were estimated at $26.6 million and $26.8 million for the periods ended September 30, 2017 and December 31, 2016, respectively. However, we account for our workers' compensation accrued liability on a discounted basis, using a discount rate of 2.00% at both September 30, 2017 and December 31, 2016. Accrued liabilities for employee healthcare benefits, which are estimates of unpaid incurred medical and prescription drug costs as provided by our healthcare administrators, were $3.3 million and $3.6 million as of September 30, 2017 and December 31, 2016, respectively.

Derivative Financial Instruments. Consistent with guidelines established by management and approved by our Board of Directors, we use derivative financial instruments to mitigate our exposure to changes in the market price of aluminum, alloying metals and energy and, to a lesser extent, foreign currency exchange rates. We do not use derivative financial instruments for trading or other speculative purposes. Hedging transactions are executed centrally on behalf of all of our operations to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors.

We reflect the fair value of all of our derivative instruments on our Consolidated Balance Sheets (see Note 9). The carrying values of hedges settling within one year are included in Prepaid expenses and other current assets or Other accrued liabilities. Carrying values for hedges settling beyond one year are included in Other assets or Long-term liabilities.

We do not meet the documentation requirements for hedge (deferral) accounting related to aluminum and energy derivatives. Accordingly, we record unrealized gain or loss associated with these hedges in the Statements of Consolidated Income within Unrealized gain on derivative instruments. As such derivatives settle, we reverse any previously recorded unrealized gain or loss associated with these hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

Forward swap contracts for zinc and copper ("Alloy Hedges") used in our fabrication operations are designated and qualify as cash flow hedges. Unrealized gain and loss associated with the Alloy Hedges are deferred in Other comprehensive income, net of tax. As Alloy Hedges settle, we reverse any unrealized gain or loss previously recorded within Other comprehensive income, net of tax associated with settling Alloy Hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

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. Some of these derivative contracts qualify for cash flow hedge accounting and are designated as cash flow hedges. The remainder are non-designated hedges. Both realized and unrealized gains and losses of foreign currency forward contracts designated as cash flow hedges are deferred in Accumulated other comprehensive loss and, over the period that the underlying equipment is depreciated, realized gains and losses are recorded as an adjustment to depreciation expense. For non-designated foreign currency forward contracts, gains and losses (both unrealized and realized) are reflected as an increase or reduction in Other income (expense), net.

Fair Value Measurements. We apply the fair value hierarchy established by GAAP for the recognition and measurement of certain financial assets and liabilities. An asset or liability's fair value classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and consider counterparty risk in our assessment of fair value.

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 each period include our derivative instruments and available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 6). Additionally, we measure at fair value once each year at December 31 the plan assets of the Salaried VEBA (defined in Note 6) and our Canadian defined benefit pension plan. We record our remaining financial assets and liabilities at carrying value.

For a majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, we are not required to measure their 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 will be required, which could result in a reduction to the carrying amount of such asset or liability. See Note 4 for a discussion of the goodwill impairment charge recorded during the three months ended June 30, 2017 related to the operations at our Chandler, Arizona (Extrusion) facility.

We concluded that none of our other 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 quarter and nine months endedSeptember 30, 2017.

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), 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. In August 2015, ASU 2014-09 was amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 by one year for all entities and permits early adoption on a limited basis. ASU 2014-09 was subsequently amended by four additional pronouncements: (i) ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; (ii) ASU No. 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting; (iii) ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; and (iv) ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements to Topic 606.

We have evaluated the impacts on our financial reporting of adopting ASU 2014-09, including its subsequent amendments discussed above (together "ASC 606"), and have regularly reported our findings and implementation readiness to the Audit Committee and internal stakeholders. We plan to adopt ASC 606 using the modified retrospective transition approach for the fiscal year ending December 31, 2018, with the cumulative-effect adjustment recognized in beginning Retained earnings. In calculating the cumulative-effect adjustment, we will only apply the guidance to contracts not completed at the date of adoption. The primary change to our accounting policies upon adopting ASC 606 will relate to the timing of when revenue is recognized. While revenue from sales of certain contracts will continue to be recognized at a point in time, revenue from other contracts will be required to be recognized over time. Upon adoption, a majority of our Aero/HS products and a substantial portion of our Automotive Extrusions will convert to over time recognition. For these products, we will accelerate revenue recognition throughout the production process whereas previously we did not recognize revenue until the product shipped or reached its destination, based on the transfer of risks and title. We are still finalizing our assessment of the specific dollar impact that over-time recognition will have on our consolidated financial statements. After the cumulative-effect adjustment, however, we do not believe it will have a material effect on revenue recognized compared to current accounting during any given period.

We do not believe the adoption of ASC 606 will result in: (i) a change in the number of distinct performance obligations within our contractual arrangements; (ii) a change in our current capitalization and deferral policies; (iii) a change in our accounting for contract acquisition and fulfillment costs; (iv) the addition of any contract liability balances; or (v) the adjustment of the amount of promised consideration from our customers for the effects of significant financing components. Additionally, we plan to account for shipping and handling activities that occur after the customer has obtained control of a product as fulfillment activities (i.e., an expense) rather than as a promised service (i.e., a revenue element).

As of September 30, 2017, we have: (i) finalized our review of most of our customer contracts; (ii) completed most of the system updates to track information needed to apply ASC 606; and (iii) trained internal stakeholders on the pending changes to revenue recognition policies and work procedures. We expect to complete our implementation work in time to adopt ASC 606 for periods starting after December 31, 2017.

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 assessing the impact and expect the adoption of this ASU in 2019 to have a material impact on our consolidated financial statements.

ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"), was issued in August 2017. The amendments under ASU 2017-12 refine and expand hedge accounting requirements for both financial (e.g., interest rate) and commodity risks. Its provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also makes certain targeted improvements to simplify the application of hedge accounting guidance. ASU 2017-12 becomes effective for us in the first quarter of 2019. We are currently assessing the impact the adoption of this ASU will have on our consolidated financial statements.

We do not anticipate any material impact on our consolidated financial statements upon the adoption of the following accounting pronouncements: (i) ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities;(ii) ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments; (iii) ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost; and (iv) ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.

There were no material impacts on our consolidated financial statements resulting from our early adoption in the first quarter of 2017 of the following accounting pronouncements: (i) ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; (ii) ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash;and (iii) ASU No. 2017-04, Intangibles - Goodwill and Other(Topic 350): Simplifying the Test for Goodwill Impairment.

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Supplemental Balance Sheet Information

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Information

	September 30, 2017		December 31, 2016
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	17.3	$	37.9
Commercial paper	56.6		17.3
Total	$	73.9	$	55.2

	September 30, 2017			December 31, 2016
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	138.8		$	138.2
Unbilled trade receivables	0.2			0.3
Trade receivables, gross	139.0			138.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	138.2		$	137.7
Inventories
Finished products	$	64.8		$	73.8
Work-in-process	86.1			71.7
Raw materials	56.9			51.1
Operating supplies	4.4			5.0
Total	$	212.2		$	201.6
Property, Plant and Equipment, Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	90.2			88.6
Machinery and equipment	675.0			615.1
Construction in progress	27.8			34.8
Property, plant and equipment, gross	815.7			761.2
Accumulated depreciation	(258.2		)	(230.6		)
Assets held for sale	0.3			0.3
Property, plant and equipment, net	$	557.8		$	530.9
Other Accrued Liabilities
Uncleared cash disbursements	$	7.1		$	5.8
Accrued income taxes and taxes payable	9.0			4.3
Accrued annual contribution to VEBAs	12.0			20.0
Accrued interest	8.4			2.9
Other	6.8			7.1
Total	$	43.3		$	40.1
Long-Term Liabilities
Workers' compensation accruals	$	25.0		$	25.0
Long-term environmental accrual – Note 8	16.1			15.8
Long-term portion of contingent contribution to Union VEBA – Note 6	—			12.8
Other long-term liabilities	20.8			19.6
Total	$	61.9		$	73.2

Supplemental Balance Sheet Information

	September 30, 2017		December 31, 2016
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	17.3	$	37.9
Commercial paper	56.6		17.3
Total	$	73.9	$	55.2

	September 30, 2017			December 31, 2016
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	138.8		$	138.2
Unbilled trade receivables	0.2			0.3
Trade receivables, gross	139.0			138.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	138.2		$	137.7
Inventories
Finished products	$	64.8		$	73.8
Work-in-process	86.1			71.7
Raw materials	56.9			51.1
Operating supplies	4.4			5.0
Total	$	212.2		$	201.6
Property, Plant and Equipment, Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	90.2			88.6
Machinery and equipment	675.0			615.1
Construction in progress	27.8			34.8
Property, plant and equipment, gross	815.7			761.2
Accumulated depreciation	(258.2		)	(230.6		)
Assets held for sale	0.3			0.3
Property, plant and equipment, net	$	557.8		$	530.9
Other Accrued Liabilities
Uncleared cash disbursements	$	7.1		$	5.8
Accrued income taxes and taxes payable	9.0			4.3
Accrued annual contribution to VEBAs	12.0			20.0
Accrued interest	8.4			2.9
Other	6.8			7.1
Total	$	43.3		$	40.1
Long-Term Liabilities
Workers' compensation accruals	$	25.0		$	25.0
Long-term environmental accrual – Note 8	16.1			15.8
Long-term portion of contingent contribution to Union VEBA – Note 6	—			12.8
Other long-term liabilities	20.8			19.6
Total	$	61.9		$	73.2

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Debt and Credit Facility

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt and Credit Facility

Debt and Credit Facility

Senior Notes

5.875% Senior Notes. In May 2016, we issued $375.0 million principal amount of 5.875% unsecured senior notes due May 15, 2024 ("5.875% Senior Notes") at 100% of the principal amount. The unamortized amount of debt issuance costs as of September 30, 2017 was $5.6 million. Interest expense, including amortization of debt issuance costs, relating to the 5.875% Senior Notes was $5.7 million and $17.1 million for the quarter and nine months endedSeptember 30, 2017, respectively, and $5.7 million and $8.8 million for the quarter and nine months endedSeptember 30, 2016. A portion of the interest relating to the 5.875% Senior Notes was capitalized as construction in progress. The effective interest rate of the 5.875% Senior Notes is approximately 6.1% per annum, taking into account the amortization of debt issuance costs. The fair value of the outstanding 5.875% Senior Notes, which are Level 1 liabilities, was calculated based on broker quotes and was approximately $402.1 million and $390.8 million at September 30, 2017 and December 31, 2016, respectively.

8.25% Senior Notes. In May 2012, we issued $225.0 million principal amount of 8.25% unsecured senior notes due June 1, 2020 ("8.25% Senior Notes"), of which $197.8 million principal amount remained outstanding at December 31, 2015. On June 1, 2016 we redeemed in full all remaining 8.25% Senior Notes at a redemption price of 104.125% of the principal amount. Interest expense, including amortization of debt issuance costs, relating to the 8.25% Senior Notes was $7.1 million for the nine months endedSeptember 30, 2016. A portion of the interest relating to the 8.25% Senior Notes was capitalized as construction in progress.

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 $294.4 million of borrowing availability under the Revolving Credit Facility at September 30, 2017, based on the borrowing base determination then in effect. At September 30, 2017, there were no borrowings under the Revolving Credit Facility and $7.8 million was being used to support outstanding letters of credit, leaving $286.6 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.50% at September 30, 2017.

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Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure

Goodwill and Intangible Assets

Goodwill. Goodwill is related to our acquisitions of the Chandler, Arizona (Extrusion) facility and the Florence, Alabama facility and is included in the Fabricated Products segment. As of September 30, 2017, the carrying value of our goodwill was $18.8 million, reflecting an impairment in the quarter ended June 30, 2017. The carrying value was $37.2 million at both the beginning and the end of the year ended December 31, 2016.

Several factors identified in a qualitative review in the quarter ended June 30, 2017 indicated that long-term demand for hard alloy extruded shapes produced at the Chandler, Arizona (Extrusion) facility was less than previously assumed. Such factors included: (i) reduced build rates of wide body commercial aircraft; (ii) continued low build rates for business jets; and (iii) additional substitution away from hard alloy extruded shapes in favor of composites, titanium and/or aerospace aluminum plate in the manufacture of commercial aircraft. After testing for goodwill impairment applying Level 3 inputs and a combination of an income approach using the estimated discounted cash flow and a market-based valuation methodology, we impaired the carrying value of the Chandler, Arizona (Extrusion) facility by $18.4 million to its fair value as of June 30, 2017. As this goodwill is deductible for income tax purposes, the deferred tax effects were included in the impairment charge and income tax provision.

Intangible Assets. During the quarter ended September 30, 2016, we impaired one of our customer relationship intangible assets by $2.6 million. The non-cash impairment charge resulted from the loss of a customer during the quarter ended September 30, 2016.

Other than the impairments discussed above, we identified no other indicators of impairment associated with the remainder of our goodwill and intangible assets during the nine months endedSeptember 30, 2017 and September 30, 2016.

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Income Tax Matters

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Tax Matters

Income Tax Matters

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Domestic	$	15.7	$	9.1	$	35.8	$	39.5
Foreign	0.4		0.3		1.0		0.7
Total	$	16.1	$	9.4	$	36.8	$	40.2

The income tax provision for the quarters ended September 30, 2017 and September 30, 2016 was $16.1 million and $9.4 million, respectively, reflecting an effective tax rate of 44.7% and 38.7%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended September 30, 2017 was due to an increase of $2.5 million for the recognition of a deferred tax liability associated with earnings of our Canadian subsidiary that are no longer considered indefinitely reinvested, resulting in a 7.1% increase to the blended statutory tax rate. We determined our indefinite reinvestment assertion with respect to our Canadian foreign earnings was no longer applicable based primarily on expectations that productivity improvements will obviate the need to make sizable capital investments to increase capacity.

There was no material difference between the effective tax rate and the projected blended statutory tax rate for the quarter endedSeptember 30, 2016.

The income tax provision for the nine months endedSeptember 30, 2017 and September 30, 2016 was $36.8 million and $40.2 million, respectively, reflecting an effective tax rate of 37.8% and 37.5%, respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the nine months endedSeptember 30, 2017 was due to: (i) a decrease of $1.7 million for the recognition of excess tax benefits from stock-based compensation, resulting in a 1.7% decrease to the blended statutory tax rate; (ii) a decrease of $0.5 million to the valuation allowance for certain state net operating losses, resulting in a 0.6% decrease to the blended statutory tax rate; (iii) a decrease of $0.2 million related to unrecognized tax benefits, including interest and penalties, resulting in a 0.2% decrease to the blended statutory tax rate; which was offset by (iv) an increase of $2.5 million for the recognition of a deferred tax liability associated with earnings of our Canadian subsidiary that are no longer indefinitely reinvested, resulting in a 2.6% 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 nine months endedSeptember 30, 2016.

Our gross unrecognized benefits relating to uncertain tax positions were $1.5 million and $1.8 million at September 30, 2017 and December 31, 2016, respectively, of which, $0.4 million and $0.7 million would be recorded through our income tax provision and thus impact the effective tax rate at September 30, 2017 and December 31, 2016, 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.

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Employee Benefits

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Employee Benefits

Employee Benefits

Pension and Similar Benefit Plans. We provide contributions to: (i) defined contribution 401(k) savings plans for salaried employees and certain hourly employees; (ii) 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; (iii) 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"), the International Association of Machinists and certain other unions at certain of our production facilities; and (iv) a defined benefit plan for salaried employees at our London, Ontario (Canada) facility.

Deferred Compensation Program. We have 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 as a result of the limitations imposed by the Internal Revenue Code of 1986. Despite the plan being an unfunded plan, we make an annual contribution to a rabbi trust to fulfill future funding obligations as contemplated by the terms of the plan. These assets are held in various investment funds at certain registered investment companies and are accounted for as available for sale securities within Level 2 of the fair value hierarchy and are measured and recorded at fair value based on their quoted market prices. The fair value of these assets at September 30, 2017 and December 31, 2016 was $9.7 million and $8.2 million, respectively, and are included in Other assets. Offsetting liabilities relating to the deferred compensation plan are included in Long-term liabilities.

Union VEBA Postretirement Obligation. 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 spouses and eligible dependents ("Union VEBA"). We have an obligation to make variable cash contributions to the Union VEBA with respect to periods through September 2017. During the first quarter of 2017, we paid $17.1 million to the Union VEBA with respect to the twelve months ended December 31, 2016. Our final cash contribution to the Union VEBA with respect to the nine months ending September 30, 2017 will be paid in the first quarter of 2018. Although the final contribution amount is variable, it cannot exceed $12.8 million. As of September 30, 2017, $12.0 million was recorded within Other accrued liabilities for this final contribution.

Salaried VEBA Postretirement Obligation. Additionally, certain other retirees who retired prior to 2004 and certain employees who were hired prior to February 2002 and have subsequently retired or will retire with the requisite age and service, along with their surviving spouses and eligible dependents, are eligible to participate in a separate VEBA that provides healthcare cost, medical cost and long-term care insurance cost reimbursement benefits ("Salaried VEBA"). We have an ongoing obligation with no express termination date to make annual variable cash contributions to the Salaried VEBA 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, 2016. The contribution amount cannot exceed $2.9 million per year. Our contribution with respect to 2016 was $2.9 million, which we paid in the first quarter of 2017. We account for the Salaried VEBA as a defined benefit plan in our financial statements.

Fair Value of 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.

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: (i) a charge for service rendered by employees; (ii) a charge for accretion of interest; (iii) a benefit for the return on plan assets; and (iv) amortization of prior service costs associated with plan amendments and net gains or losses on assets. Net periodic benefit cost related to the Canadian defined benefit plan was not material for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016.

The following table presents the components of Net periodic postretirement benefit cost relating to Salaried VEBA for the periods presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA1:
Interest cost	$	0.8		$	0.7		$	2.3		$	2.2
Expected return on plan assets	(1.0		)	(1.0		)	(3.1		)	(3.0		)
Amortization of prior service cost	1.2			1.0			3.6			3.0
Amortization of net actuarial loss	0.2			0.1			0.6			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	$	1.2		$	0.8		$	3.4		$	2.5

____________

¹  The service cost was insignificant for all periods presented.

The following table presents the total charges (income) related to all benefit plans for the periods presented (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017			2016
Included within Fabricated Products:
Deferred compensation plan	$	0.1	$	0.1	$	0.3		$	0.2
Defined contribution plans	1.3		1.6		6.8			6.7
Multiemployer pension plans	1.1		1.2		3.4			3.5
Total Fabricated Products	$	2.5	$	2.9	$	10.5		$	10.4
Included within All Other:
Deferred compensation plan	0.4		0.4		1.1			0.6
Defined contribution plans	0.1		0.1		0.7			0.7
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2		0.8		3.4			2.5
Loss (gain) on removal of Union VEBA net assets	0.5		—		(0.8		)	(0.1		)
Total All Other	$	2.2	$	1.3	$	4.4		$	3.7
Total	$	4.7	$	4.2	$	14.9		$	14.1

For all periods presented, 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").

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Employee Incentive Plans

9 Months Ended

Sep. 30, 2017

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 return on adjusted net assets of our Fabricated Products business. Most of our production facilities have similar programs for both hourly and salaried employees. As of September 30, 2017, we had a liability of $14.5 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the nine month performance period of our 2017 STI Plan.

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, were eligible to participate in the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan ("2016 Plan"). The 2016 Plan was approved by stockholders on May 26, 2016 and replaced and succeeded in its entirety the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan. At September 30, 2017, 735,724 shares were available for awards under the 2016 Plan.

Non-Vested Common Shares and Restricted Stock Units. We grant non-vested common shares to our non-employee directors and non-vested common shares and restricted stock units to our 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 or a cash amount equaling the value of 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.

Performance Shares. 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 and earned entitles the recipient to receive one common share or a cash amount equaling the value of one common share. During the first quarter of 2017, performance shares granted in 2014 under the 2014-2016 LTI Program vested (see "Summary of Activity" below). The number of performance shares that vested and resulted in the issuance of common shares was determined based on our total shareholder return ("TSR") compared to the TSR of a specified group of peer companies over a three-year performance period.

Performance shares granted in 2015 are subject to performance conditions pertaining to our TSR relative to the TSR of a specified group of peer companies over a three-year performance period ("TSR-Based Performance Shares").

Performance shares granted in 2016 consist of TSR-Based Performance Shares and performance shares subject to performance requirements pertaining to our total controllable cost performance over a three-year performance period ("CP-Based Performance Shares").

Performance shares granted in 2017 consist of TSR-Based Performance Shares, CP-Based Performance Shares and performance shares subject to performance conditions pertaining to our economic value added ("EVA") performance, determined based on our adjusted pre-tax operating income in excess of a capital charge, over a three-year performance period ("EVA-Based Performance Shares").

The number of performance shares under the 2015-2017, 2016-2018 and 2017-2019 LTI Programs that may be earned and result in the issuance of common shares ranges between 0% to 200% of the target number of underlying common shares, which is approximately one-half of the maximum payout. The performance shares granted under the 2015-2017, 2016-2018 and 2017-2019 LTI Programs will vest in 2018, 2019 and 2020, respectively.

Non-Cash Compensation Expense. Non-cash compensation expense relating to all awards 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares and restricted stock units	$	1.4	$	1.2	$	3.9	$	3.5
TSR-Based Performance Shares	1.2		1.5		3.7		4.0
CP-Based Performance Shares	0.8		0.4		2.0		0.9
EVA-Based Performance Shares	0.2		—		0.4		0.3
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Fabricated Products	$	1.3	$	1.2	$	3.8	$	3.1
All Other	2.3		1.9		6.2		5.6
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of September 30, 2017:

	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	$	9.6	2.6
TSR-Based Performance Shares	$	5.6	1.7
CP-Based Performance Shares	$	6.1	2.1
EVA-Based Performance Shares	$	1.5	2.4

Summary of Activity. A summary of the activity with respect to non-vested common shares, restricted stock units, TSR-Based Performance Shares, CP-Based Performance Shares and EVA-Based Performance Shares for the nine months endedSeptember 30, 2017 is as follows:

	Non-Vested Common Shares				Restricted Stock Units				TSR-Based Performance Shares				CP-Based Performance Shares				EVA-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, 2016	114,658		$	69.51	61,800		$	74.94	394,525		$	90.30	63,678		$	80.46	—		$	—
Granted1	11,817		86.92		92,275		76.13		65,044		97.88		65,044		79.69		32,504		79.69
Vested	(46,689	)	71.46		(8,655	)	76.94		(94,082	)	83.18		—		—		—		—
Forfeited1	(427	)	69.83		(6,412	)	77.70		(5,519	)	95.88		(3,342	)	79.92		(1,164	)	79.69
Canceled1	—		—		—		—		(55,288	)	83.18		—		—		—		—
Outstanding at September 30, 2017	79,359		$	70.96	139,008		$	75.72	304,680		$	95.31	125,380		$	80.07	31,340		$	79.69

____________

¹  For 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 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares	$	—	$	—	$	86.92	$	86.11
Restricted stock units	$	82.33	$	—	$	76.13	$	75.57
TSR-Based Performance Shares	$	—	$	—	$	97.88	$	93.02
CP-Based Performance Shares	$	—	$	—	$	79.69	$	80.46
EVA-Based Performance Shares	$	—	$	—	$	79.69	$	—

Stock Options. As of December 31, 2016, we had 1,543 fully-vested outstanding stock options exercisable to purchase common shares at $80.01 per share, all of which subsequently expired on April 2, 2017. No options were granted during the nine months endedSeptember 30, 2017, and no options were outstanding as of September 30, 2017.

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 nine months endedSeptember 30, 2017 and September 30, 2016, 56,195 and 35,498 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.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

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 9).

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 are also subject to legacy environmental contingencies related to activities that occurred at operating facilities within Fabricated Products prior to July 6, 2006 while such operating facilities were being operated by a predecessor, which represent the majority of our environmental accruals. The status of these environmental contingencies are discussed below. 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.

We continue to pursue remediation activities, primarily to address the historical use of oils containing polychlorinated biphenyls ("PCBs") at our Spokane, Washington ("Trentwood") facility. Our remediation efforts are in collaboration with the Washington State Department of Ecology ("Washington State Ecology"), to which we submitted a feasibility study in 2012 of remediation alternatives and from which we received permission to begin certain remediation activities pursuant to a signed work order. As we have finished a number of sections of the work plan, we have received approval from Washington State Ecology on satisfactory completion of those sections. Additionally, in cooperation with Washington State Ecology, to determine the treatability and evaluate the feasibility of removing PCBs from ground water under the Trentwood facility, we constructed a pilot test facility and began treatment operations at the test facility in the first half of 2016. As the success of the new methodology cannot be reasonably determined at this time, it is possible we may need to make upward adjustments to our related accruals as facts and cost estimates regarding the groundwater treatment method and the operation of the treatment facility 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 have 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 12 to 15 months.

At September 30, 2017, our environmental accrual of $16.9 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 $12.2 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 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.

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Derivatives, Hedging Programs and Other Financial Instruments

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Related Hedging Programs

Derivatives, Hedging Programs and Other Financial Instruments

Overview. In conducting our business, we enter into derivative transactions, including forward contracts and options, to limit our exposure to: (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 other officers and employees selected by the chief executive officer.The Hedging Committee meets regularly to review commodity price exposure, derivative positions and strategy, and management reports to our Board of Directors on the scope of its activities.

We are exposed to counterparty credit risk on all of our derivative instruments, which we manage by monitoring the credit quality of our counterparties and allocating our hedging positions among multiple counterparties to limit exposure to any single entity. Our counterparties are major, investment grade financial institutions or trading companies. Hedging transactions are governed by negotiated reciprocal credit lines, which generally require collateral to be posted above specified credit thresholds. We believe the risk of loss is remote and contained due to counterparty credit quality, our diversification practice and collateral requirements.

In a majority of our hedging counterparty agreements, our counterparty offers us a credit line that adjusts up or down, depending on our liquidity. Below specified liquidity thresholds, we may have to post collateral if the fair value of our net liability with such counterparty exceeds our reduced credit line. We manage this risk by allocating hedging transactions among multiple counterparties, using 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 insignificant at both September 30, 2017 and December 31, 2016, and we had no collateral posted as of those dates.

Additionally, our firm-price customer sales commitments create incremental customer credit risk related to metal price movements. Under certain circumstances, we mitigate this risk by periodically requiring cash collateral from them, which we classify as deferred revenue and include as a component of Other accrued liabilities. At September 30, 2017, we had no cash collateral posted from any of our customers. For more information about concentration risks concerning customers and suppliers, see Note 11.

Notional Amount of Derivative Contracts. The following table summarizes our derivative positions at September 30, 2017:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Purchased put option contracts	10/17 through 12/17	13.4
Fixed price purchase contracts	10/17 through 12/21	151.9
Fixed price sales contracts	10/17 through 11/19	1.8
Midwest premium swap contracts1	10/17 through 12/21	150.1

Alloying Metals	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Fixed price purchase contracts	10/17 through 6/18	4.6

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	10/17 through 12/20	3,650,000

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	10/17 through 4/18	301,304

______________________

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 September 30, 2017, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 72% of the expected natural gas purchases for the remainder of 2017, 71% of the expected natural gas purchases for both 2018 and 2019 and 39% of the expected natural gas purchases for 2020.

We have physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for the remainder of 2017, 55% of the expected electricity purchases for both 2018 and 2019 and 18% of the expected electricity purchases for 2020.

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.

We are exposed to risk of fluctuating prices for natural gas and electricity. We, from time to time, in the ordinary course of business, enter into hedging transactions and/or physical delivery commitments with third parties to mitigate our risk from fluctuations in natural gas and electricity prices.

We are also exposed to foreign currency exchange risk related to firm-price agreements for equipment purchases from foreign manufacturers. We use foreign currency forward contracts designed to line up with the timing and amounts of scheduled payments to the foreign equipment manufacturers to mitigate our exposure to currency exchange rate fluctuations on these purchases. Realized and unrealized periodic gains and losses of non-designated foreign currency forward contracts are reflected as a reduction or increase in Other income (expense), net.

Designated Alloying Metal Hedges. We enter into agreements with suppliers to purchase alloying metals (zinc and copper) used as raw materials in our fabrication operations at fluctuating prices that we are unable to pass along to our customers. We mitigate our exposure to metal price risk by entering into Alloy Hedges with third-party financial institutions at predetermined/fixed prices at stated delivery dates. Our Alloy Hedges are expected to be highly effective because monthly settlements correspond to forecasted physical purchases of alloying metals by our manufacturing facilities. The effective portion of the fair value on these Alloy Hedges is recorded within Other comprehensive income, net of tax, and is reclassified into the Statements of Consolidated Income during the month of settlement to Cost of products sold (See Note 14). As of September 30, 2017, we estimate the net gain of $0.5 million will be reclassified from Accumulated other comprehensive income into Net income within the next 12 months. We incurred no ineffectiveness on these hedges during the quarter and nine months endedSeptember 30, 2017.

Realized and Unrealized Gain and Loss. Realized and unrealized (gain) loss included on the Statements of Consolidated Income associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Realized (gain) loss:
Aluminum	$	(4.0	)	$	0.4		$	(13.8	)	$	4.1
Natural gas	0.2			0.9			0.3			4.2
Alloy Hedges	(0.3		)	—			(0.2		)	—
Foreign exchange	(0.1		)	—			(0.1		)	—
Total realized (gain) loss1	$	(4.2	)	$	1.3		$	(13.8	)	$	8.3
Unrealized (gain) loss:
Aluminum	$	(10.6	)	$	(1.7	)	$	(15.3	)	$	(11.7	)
Natural gas	(0.2		)	(0.3		)	1.3			(5.2		)
Total unrealized gain2	$	(10.8	)	$	(2.0	)	$	(14.0	)	$	(16.9	)

______________________

¹  Recorded within Cost of products sold, excluding depreciation, amortization and other items within the Fabricated Products segment.

²  Recorded within Unrealized gain on derivative instruments within the Fabricated Products segment.

Fair Values of Derivative Contracts. The fair values of our derivative contracts are based upon trades in liquid markets. Valuation model inputs can be verified, and valuation techniques do not involve significant judgment. The fair values of such financial instruments are classified within Level 2 of the fair value hierarchy.

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):

	September 30, 2017
	Level 1		Level 2		Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	18.4	$	—	$	18.4
Midwest premium swap contracts	—		0.8		—		0.8
Natural gas – Fixed price purchase contracts	—		0.4		—		0.4
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		0.9		—		0.9
Total derivative assets1	$	—	$	20.5	$	—	$	20.5

	September 30, 2017
	Level 1		Level 2			Level 3		Total
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price sales contracts	$	—	$	(0.1	)	$	—	$	(0.1	)
Midwest premium swap contracts	—		(0.8		)	—		(0.8		)
Natural gas – Fixed price purchase contracts	—		(0.5		)	—		(0.5		)
Total derivative liabilities2	$	—	$	(1.4	)	$	—	$	(1.4	)

____________

¹  Of the $20.5 million in total derivative assets, $15.8 million and $4.7 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.4 million in total derivative liabilities, $0.9 million and $0.5 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

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, 2016
	Level 1		Level 2			Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	3.3		$	—	$	3.3
Midwest premium swap contracts	—		0.9			—		0.9
Natural gas – Fixed price purchase contracts	—		1.6			—		1.6
Total derivative assets1	$	—	$	5.8		$	—	$	5.8
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	(1.1	)	$	—	$	(1.1	)
Midwest premium swap contracts	—		(0.2		)	—		(0.2		)
Natural gas – Fixed price purchase contracts	—		(0.4		)	—		(0.4		)
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		(0.1		)	—		(0.1		)
Total derivative liabilities2	$	—	$	(1.8	)	$	—	$	(1.8	)

____________

¹  Of the $5.8 million in total derivative assets, $5.0 million and $0.8 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.8 million in total derivative liabilities, $0.8 million and $1.0 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

The aggregate fair value of our derivatives at September 30, 2017 and December 31, 2016 was a net asset of $19.1 million and a net asset of $4.0 million, respectively. The increase in the net asset position during the nine months endedSeptember 30, 2017 was primarily due to changes in the underlying commodity and energy prices, as well as settlement of positions during the period. Changes in the fair value of our derivative contracts relating to non-designated hedges of operational activities are reflected in Operating income.

Offsetting Information. We enter into derivative contracts with counterparties subject to enforceable master netting arrangements and, from time to time, not subject to netting arrangements. We reflect the fair value of our derivative contracts on a gross basis on the Consolidated Balance Sheets. We had no cash collateral pledged or received with our counterparties as of both September 30, 2017 and December 31, 2016.

The following tables present offsetting information regarding our derivatives by type of counterparty as of September 30, 2017 (in millions of dollars):

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	20.5	$	—	$	20.5	$	1.4	$	19.1
Total	$	20.5	$	—	$	20.5	$	1.4	$	19.1

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—
Total	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—

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

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	3.3	$	—	$	3.3	$	1.0	$	2.3
Counterparty (with partial netting agreements)	2.5		—		2.5		0.7		1.8
Total	$	5.8	$	—	$	5.8	$	1.7	$	4.1

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.0	)	$	—	$	(1.0	)	$	(1.0	)	$	—
Counterparty (with partial netting agreements)	(0.8		)	—		(0.8		)	(0.7		)	(0.1		)
Total	$	(1.8	)	$	—	$	(1.8	)	$	(1.7	)	$	(0.1	)

Fair Value of Other Financial Instruments

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 September 30, 2017, all of our short-term investments had maturity dates within 12 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 September 30, 2017 and December 31, 2016, the total unrealized loss, net of tax, included in Accumulated other comprehensive income 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 was due to normal market fluctuations, and not due to increased credit risk or other valuation concerns. The fair value input of our available for sale securities, which are classified within Level 2 of the fair value hierarchy, is calculated based on broker quotes. 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. See Note 2 for components of cash and cash equivalents.

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of September 30, 2017 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.3	$	56.6	$	—	$	73.9
Short-term investments	—		191.4		—		191.4
Total	$	17.3	$	248.0	$	—	$	265.3

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of December 31, 2016 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	37.9	$	17.3	$	—	$	55.2
Short-term investments	—		231.0		—		231.0
Total	$	37.9	$	248.3	$	—	$	286.2

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Net Income Per Share and Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Net Income per Share and Stockholders Equity

Net Income Per Share and Stockholders' Equity

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Numerator:
Net income	$	19.9	$	14.9	$	60.6	$	67.2
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	16,834		17,841		17,072		17,858
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options	326		334		291		323
Diluted2	17,160		18,175		17,363		18,181
Net income per common share, Basic:	$	1.18	$	0.84	$	3.55	$	3.76
Net income per common share, Diluted:	$	1.16	$	0.82	$	3.49	$	3.70

______________________

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 and nine months endedSeptember 30, 2017 and September 30, 2016 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Non-vested common shares, restricted stock units and performance shares	3	3	3	2
Total excluded	3	3	3	2

Dividends. During the nine months endedSeptember 30, 2017 and September 30, 2016, we paid a total of approximately $26.4 million and $24.4 million, respectively, in cash dividends to stockholders, including the holders of restricted stock, and in dividend equivalents to the holders of certain restricted stock units and performance shares.

Stock Repurchase Program. From time to time, we repurchase shares pursuant to a stock repurchase program authorized by our Board of Directors. Such repurchases of our common stock are recorded as Treasury stock. 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.

The following table summarizes repurchases recorded as treasury stock for each period presented:

	Nine Months Ended
	September 30,
	2017		2016
Number of common shares repurchased	806,307		170,304
Weighted-average repurchase price (dollars per share)	$	80.60	$	81.04
Total cost of repurchased common shares (in millions of dollars)	$	64.9	$	13.8

At September 30, 2017, $123.4 million were available to repurchase our common shares pursuant to the stock repurchase program.

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Segment and Geographical Area Information

9 Months Ended

Sep. 30, 2017

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 Aero/HS products, Automotive Extrusions, GE products and 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 September 30, 2017, approximately 64% of our employees were covered by collective bargaining agreements and approximately 12% of our employees were covered by collective bargaining agreements with expiration dates occurring within one year from September 30, 2017.

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						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Net sales:
Fabricated Products	$	332.8		$	320.6		$	1,044.4		$	998.7
Segment operating income (loss):
Fabricated Products	$	53.7		$	42.1		$	149.9		$	172.1
All Other	(13.9		)	(12.3		)	(39.2		)	(39.6		)
Total operating income	$	39.8		$	29.8		$	110.7		$	132.5
Interest expense	(5.3		)	(5.5		)	(16.4		)	(14.7		)
Other income (expense), net	1.5			—			3.1			(10.4		)
Income before income taxes	$	36.0		$	24.3		$	97.4		$	107.4
Depreciation and amortization:
Fabricated Products	$	10.1		$	8.8		$	28.9		$	26.2
All Other	0.1			0.2			0.4			0.5
Total depreciation and amortization	$	10.2		$	9.0		$	29.3		$	26.7
Capital expenditures:
Fabricated Products	$	16.3		$	15.0		$	55.7		$	57.1
All Other	0.1			0.1			0.4			0.3
Total capital expenditures	$	16.4		$	15.1		$	56.1		$	57.4

	September 30, 2017		December 31, 2016
Assets:
Fabricated Products	$	1,007.9	$	969.4
All Other1	414.8		474.1
Total assets	$	1,422.7	$	1,443.5

_____________________

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 for the Fabricated Products segment by end market applications were as follows (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Net sales:
Aero/HS products	$	150.2	$	156.1	$	483.2	$	500.7
Automotive Extrusions	52.7		46.5		161.6		143.6
GE products	115.9		105.6		361.1		318.3
Other products	14.0		12.4		38.5		36.1
Total net sales	$	332.8	$	320.6	$	1,044.4	$	998.7

All income taxes are paid by the Fabricated Products reporting segment. Geographic information for income taxes paid was as follows (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Income taxes paid:
Domestic	$	0.3	$	0.1	$	0.7	$	0.4
Foreign	—		—		0.1		0.5
Total income taxes paid	$	0.3	$	0.1	$	0.8	$	0.9

Concentrations. For the quarter ended September 30, 2017, one customer represented 27% and another represented 11% of Fabricated Products Net sales. For the quarter endedSeptember 30, 2016, one customer represented 25% and another represented 11% of Fabricated Products Net Sales. For the nine months endedSeptember 30, 2017, one customer represented 28% and another represented 10% of Fabricated Products Net sales. For the nine months endedSeptember 30, 2016, one customer represented 26% and another represented 10% of Fabricated Products Net Sales.

At September 30, 2017, one customer represented 17% and a second customer represented 16% of Trade receivables, net. One individual customer accounted for 18% and two individual customers each accounted for 12% of Trade receivables, net at December 31, 2016.

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Percentage of total primary aluminum supply (lbs):
Supply from our top five major suppliers	86	%	84	%	85	%	84	%
Supply from our largest supplier	35	%	28	%	36	%	32	%
Supply from our second and third largest suppliers	35	%	33	%	33	%	31	%

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Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Nine Months Ended
	September 30,
	2017		2016
	(In millions of dollars)
Interest paid	$	10.0	$	6.7
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	3.4	$	2.4
Stock repurchases not yet settled	$	—	$	0.2
Acquisition of property and equipment through capital leasing arrangements	$	0.3	$	—
Components of cash, cash equivalents and restricted cash:	September 30, 2017		September 30, 2016
Cash and cash equivalents	$	73.9	$	72.9
Restricted cash included in Prepaid expenses and other current assets1	0.3		0.3
Restricted cash included in Other assets1	12.9		11.7
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$	87.1	$	84.9

____________

¹  We are required to keep on deposit certain amounts that are pledged or held as collateral relating to workers' compensation and other agreements. We account for such deposits as restricted cash. From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash.

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Other Income, Net

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Other Income (Expense), Net

Other Income (Expense), Net

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

	Quarter Ended					Nine Months Ended
	September 30,					September 30,
	2017		2016			2017		2016
Interest income	$	—	$	—		$	—	$	0.1
Realized gain on investments	0.8		0.1			2.2		0.4
Loss on extinguishment of debt1	—		—			—		(11.1		)
All other income (expense), net	0.7		(0.1		)	0.9		0.2
Other income (expense), net	$	1.5	$	—		$	3.1	$	(10.4	)

____________

¹  Represents the loss on extinguishment of our 8.25% Senior Notes during the nine months ended September 30, 2016, which included an $8.2 million premium paid to redeem the notes and a $2.9 million write-off of unamortized debt issuance costs associated with the notes.

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Accumulated Other Comprehensive (Loss) Income

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Accumulated Other Comprehensive (Loss) Income

Accumulated Other Comprehensive (Loss) Income

The following table presents the changes in the accumulated balances for each component of Accumulated other comprehensive (loss) income ("AOCI") for each period presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA and defined benefit pension plan:
Beginning balance	$	(35.4	)	$	(29.8	)	$	(37.1	)	$	(31.3	)
Amortization of net actuarial loss1	0.2			0.1			0.6			0.3
Amortization of prior service cost1	1.2			1.0			3.6			3.0
Less: income tax expense2	(0.5		)	(0.4		)	(1.6		)	(1.2		)
Net amortization reclassified from AOCI to Net income	0.9			0.7			2.6			2.1
Translation impact on Canadian pension plan AOCI balance	(0.1		)	—			(0.1		)	0.1
Other comprehensive income, net of tax	0.8			0.7			2.5			2.2
Ending balance	$	(34.6	)	$	(29.1	)	$	(34.6	)	$	(29.1	)
Available for sale securities:
Beginning balance	$	1.1		$	0.2		$	0.8		$	(0.1	)
Unrealized gain on available for sale securities	1.0			0.9			3.1			1.3
Less: income tax expense	(0.4		)	(0.4		)	(1.2		)	(0.5		)
Net unrealized gain on available for sale securities	0.6			0.5			1.9			0.8
Reclassification of unrealized gain upon sale of available for sale securities3	(0.5		)	(0.3		)	(2.1		)	(0.3		)
Less: income tax benefit2	0.2			0.1			0.8			0.1
Net unrealized gain reclassified from AOCI to Net income	(0.3		)	(0.2		)	(1.3		)	(0.2		)
Other comprehensive income, net of tax	0.3			0.3			0.6			0.6
Ending balance	$	1.4		$	0.5		$	1.4		$	0.5
Other:
Beginning balance	$	—		$	(0.3	)	$	(0.4	)	$	(0.3	)
Unrealized gain	1.1			0.1			1.4			0.2
Less: income tax expense	(0.4		)	—			(0.5		)	(0.1		)
Net gain	0.7			0.1			0.9			0.1
Gain reclassified from AOCI to Net income	(0.3		)	—			—			—
Less: income tax benefit2	0.1			—			—			—
Net gain reclassified from AOCI to Net income	(0.2		)	—			—			—
Other comprehensive income, net of tax	0.5			0.1			0.9			0.1
Ending balance	$	0.5		$	(0.2	)	$	0.5		$	(0.2	)
Total AOCI ending balance	$	(32.7	)	$	(28.8	)	$	(32.7	)	$	(28.8	)

________________

¹  Amounts reclassified out of AOCI relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.

²  Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.

³  Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.

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Condensed Guarantor and Non-Guarantor Financial Information

9 Months Ended

Sep. 30, 2017

Guarantor and Non-Guarantor Financial Statement [Abstract]

Condensed Guarantor and Non-Guarantor Financial Statements

Condensed Guarantor and Non-Guarantor Financial Information

During the quarter ended June 30, 2016, we issued $375.0 million aggregate principal amount of our 5.875% Senior Notes and redeemed in full the remaining principal balance of our 8.25% Senior Notes. The 5.875% Senior Notes were issued by Kaiser Aluminum Corporation ("Parent") pursuant to an indenture dated May 12, 2016 ("Indenture") with Wells Fargo Bank, National Association, as trustee ("Trustee"). The obligations of the Parent under the Indenture are guaranteed by Kaiser Aluminum Investments Company, Kaiser Aluminum Fabricated Products, LLC and Kaiser Aluminum Washington, LLC, ("Guarantor Subsidiaries"). An additional Guarantor Subsidiary, Kaiser Aluminum Alexco, LLC, merged with and into Kaiser Aluminum Fabricated Products, LLC during the first quarter of 2017. All Guarantor Subsidiaries 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 September 30, 2017 and December 31, 2016, and for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016present: (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 on a combined basis; (ii) the "Consolidating Adjustments," which represent the adjustments necessary to eliminate the investments in our subsidiaries, other intercompany balances and other intercompany sales and cost of sales 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. The condensed consolidating financial information should be read in conjunction with the consolidated financial statements herein.

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

September 30, 2017

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	70.7	$	3.2	$	—		$	73.9
Short-term investments	—		191.4		—		—			191.4
Receivables:
Trade receivables, net	—		133.1		5.1		—			138.2
Intercompany loans receivable	55.6		0.1		0.6		(56.3		)	—
Other	—		14.6		0.8		—			15.4
Inventories	—		208.5		8.6		(4.9		)	212.2
Prepaid expenses and other current assets	0.1		31.0		0.4		—			31.5
Total current assets	55.7		649.4		18.7		(61.2		)	662.6
Investments in and advances to subsidiaries	1,107.0		41.9		—		(1,148.9		)	—
Property, plant and equipment, net	—		527.6		30.2		—			557.8
Long-term intercompany loans receivable	—		—		10.5		(10.5		)	—
Deferred tax assets, net	—		113.9		—		4.8			118.7
Intangible assets, net	—		25.3		—		—			25.3
Goodwill	—		18.8		—		—			18.8
Other assets	—		39.5		—		—			39.5
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	1.4	$	86.8	$	6.2	$	—		$	94.4
Intercompany loans payable	—		56.2		0.1		(56.3		)	—
Accrued salaries, wages and related expenses	—		37.2		1.8		—			39.0
Other accrued liabilities	8.3		41.0		1.1		(7.1		)	43.3
Total current liabilities	9.7		221.2		9.2		(63.4		)	176.7
Net liabilities of Salaried VEBA	—		27.8		—		—			27.8
Deferred tax liabilities	—		—		3.3		—			3.3
Long-term intercompany loans payable	—		10.5		—		(10.5		)	—
Long-term liabilities	—		59.3		2.6		—			61.9
Long-term debt	369.4		—		—		—			369.4
Total liabilities	379.1		318.8		15.1		(73.9		)	639.1
Total stockholders' equity	783.6		1,097.6		44.3		(1,141.9		)	783.6
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	52.9	$	2.3		$	—		$	55.2
Short-term investments	—		231.0		—			—			231.0
Receivables:
Trade receivables, net	—		133.1		4.6			—			137.7
Intercompany receivables	85.8		0.1		0.6			(86.5		)	—
Other	—		11.4		0.5			—			11.9
Inventories	—		197.5		8.0			(3.9		)	201.6
Prepaid expenses and other current assets	0.1		18.0		0.9			(0.5		)	18.5
Total current assets	85.9		644.0		16.9			(90.9		)	655.9
Investments in and advances to subsidiaries	1,012.4		40.1		—			(1,052.5		)	—
Property, plant and equipment, net	—		499.5		31.4			—			530.9
Long-term intercompany receivables	80.2		—		4.9			(85.1		)	—
Deferred tax assets, net	—		154.9		—			4.8			159.7
Intangible assets, net	—		26.4		—			—			26.4
Goodwill	—		37.2		—			—			37.2
Other assets	—		33.4		—			—			33.4
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	2.2	$	68.9	$	4.7		$	—		$	75.8
Intercompany payable	—		86.4		0.1			(86.5		)	—
Accrued salaries, wages and related expenses	—		47.2		1.9			—			49.1
Other accrued liabilities	2.9		52.6		(0.7		)	(14.7		)	40.1
Total current liabilities	5.1		255.1		6.0			(101.2		)	165.0
Net liabilities of Salaried VEBA	—		28.6		—			—			28.6
Deferred tax liabilities	—		—		3.3			—			3.3
Long-term intercompany payable	—		85.1		—			(85.1		)	—
Long-term liabilities	—		70.5		2.7			—			73.2
Long-term debt	368.7		—		—			—			368.7
Total liabilities	373.8		439.3		12.0			(186.3		)	638.8
Total stockholders' equity	804.7		996.2		41.2			(1,037.4		)	804.7
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	325.9		$	26.3		$	(19.4	)	$	332.8
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			261.6			24.0			(18.4		)	267.2
Unrealized gain on derivative instruments	—			(10.8		)	—			—			(10.8		)
Depreciation and amortization	—			9.7			0.5			—			10.2
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			23.5			0.8			(0.6		)	24.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			1.2			—			—			1.2
Loss on removal of Union VEBA net assets	—			0.5			—			—			0.5
Total selling, general, administrative, research and development	1.0			25.2			0.8			(0.6		)	26.4
Total costs and expenses	1.0			285.7			25.3			(19.0		)	293.0
Operating (loss) income	(1.0		)	40.2			1.0			(0.4		)	39.8
Other (expense) income:
Interest expense	(5.0		)	(0.4		)	—			0.1			(5.3		)
Other income, net	—			1.3			0.3			(0.1		)	1.5
(Loss) income before income taxes	(6.0		)	41.1			1.3			(0.4		)	36.0
Income tax provision	—			(18.0		)	(0.4		)	2.3			(16.1		)
Earnings in equity of subsidiaries	25.9			0.6			—			(26.5		)	—
Net income	$	19.9		$	23.7		$	0.9		$	(24.6	)	$	19.9
Comprehensive income	$	21.5		$	25.3		$	0.9		$	(26.2	)	$	21.5

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	1,019.7		$	85.4		$	(60.7	)	$	1,044.4
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			805.8			75.0			(58.1		)	822.7
Unrealized gain on derivative instruments	—			(14.0		)	—			—			(14.0		)
Depreciation and amortization	—			27.7			1.6			—			29.3
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.4			67.2			5.7			(1.6		)	74.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			3.4			—			—			3.4
Gain on removal of Union VEBA net assets	—			(0.8		)	—			—			(0.8		)
Total selling, general, administrative, research and development	3.4			69.8			5.7			(1.6		)	77.3
Goodwill impairment	—			18.4			—			—			18.4
Total costs and expenses	3.4			907.7			82.3			(59.7		)	933.7
Operating (loss) income	(3.4		)	112.0			3.1			(1.0		)	110.7
Other (expense) income:
Interest expense	(15.3		)	(1.2		)	—			0.1			(16.4		)
Other income, net	—			2.7			0.5			(0.1		)	3.1
(Loss) income before income taxes	(18.7		)	113.5			3.6			(1.0		)	97.4
Income tax provision	—			(43.0		)	(0.9		)	7.1			(36.8		)
Earnings in equity of subsidiaries	79.3			1.8			—			(81.1		)	—
Net income	$	60.6		$	72.3		$	2.7		$	(75.0	)	$	60.6
Comprehensive income	$	64.6		$	76.3		$	2.7		$	(79.0	)	$	64.6

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	313.9		$	26.6		$	(19.9	)	$	320.6
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			250.0			23.7			(19.0		)	254.7
Unrealized gain on derivative instruments	—			(2.0		)	—			—			(2.0		)
Depreciation and amortization	—			8.5			0.5			—			9.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.9			24.0			1.3			(0.6		)	25.6
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Total selling, general, administrative, research and development	0.9			24.8			1.3			(0.6		)	26.4
Other operating charges, net	—			2.7			—			—			2.7
Total costs and expenses	0.9			284.0			25.5			(19.6		)	290.8
Operating (loss) income	(0.9		)	29.9			1.1			(0.3		)	29.8
Other (expense) income:
Interest (expense) income	(5.7		)	0.1			—			0.1			(5.5		)
Other (expense) income, net	(0.1		)	0.1			0.1			(0.1		)	—
(Loss) income before income taxes	(6.7		)	30.1			1.2			(0.3		)	24.3
Income tax provision	—			(11.6		)	(0.3		)	2.5			(9.4		)
Earnings in equity of subsidiaries	21.6			0.7			—			(22.3		)	—
Net income	$	14.9		$	19.2		$	0.9		$	(20.1	)	$	14.9
Comprehensive income	$	16.0		$	20.3		$	0.9		$	(21.2	)	$	16.0

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	976.9		$	80.6		$	(58.8	)	$	998.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			753.1			70.3			(56.3		)	767.1
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(16.9		)	—			—			(16.9		)
Depreciation and amortization	—			25.2			1.5			—			26.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.3			71.4			6.5			(2.0		)	79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	—			2.5			—			—			2.5
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	3.3			73.8			6.5			(2.0		)	81.6
Other operating charges, net	—			2.8			—			—			2.8
Total costs and expenses	3.3			842.9			78.3			(58.3		)	866.2
Operating (loss) income	(3.3		)	134.0			2.3			(0.5		)	132.5
Other (expense) income:
Interest (expense) income	(15.9		)	1.1			—			0.1			(14.7		)
Other (expense) income, net	(11.1		)	0.6			0.2			(0.1		)	(10.4		)
(Loss) income before income taxes	(30.3		)	135.7			2.5			(0.5		)	107.4
Income tax provision	—			(51.1		)	(0.7		)	11.6			(40.2		)
Earnings in equity of subsidiaries	97.5			1.3			—			(98.8		)	—
Net income	$	67.2		$	85.9		$	1.8		$	(87.7	)	$	67.2
Comprehensive income	$	70.1		$	88.7		$	1.9		$	(90.6	)	$	70.1

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$	(12.8	)	$	137.4		$	6.9		$	—		$	131.5
Cash flows from investing activities:
Capital expenditures	—			(55.7		)	(0.4		)	—			(56.1		)
Purchase of available for sale securities	—			(196.0		)	—			—			(196.0		)
Proceeds from disposition of available for sale securities	—			237.2			—			—			237.2
Proceeds from disposal of property, plant and equipment	—			0.6			—			—			0.6
Intercompany loans receivable	110.4			—			(5.6		)	(104.8		)	—
Net cash provided by (used in) investing activities	110.4			(13.9		)	(6.0		)	(104.8		)	(14.3		)
Cash flows from financing activities:
Repayment of capital lease	—			(0.2		)	—			—			(0.2		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(4.5		)	—			—			—			(4.5		)
Repurchase of common stock	(66.7		)	—			—			—			(66.7		)
Cash dividends and dividend equivalents paid	(26.4		)	—			—			—			(26.4		)
Intercompany loans payable	—			(104.8		)	—			104.8			—
Net cash used in financing activities	(97.6		)	(105.0		)	—			104.8			(97.8		)
Net increase in cash, cash equivalents and restricted cash during the period	—			18.5			0.9			—			19.4
Cash, cash equivalents and restricted cash at beginning of period	—			65.1			2.6			—			67.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	83.6		$	3.5		$	—		$	87.1

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries				Consolidating Adjustments				Consolidated
Cash flows from operating activities:
Net cash provided by operating activities	$	189.7		$	109.3		$	8.4			$	(200.0	)		$	107.4
Cash flows from investing activities:
Capital expenditures	—			(55.6		)	(1.8		)		—				(57.4		)
Purchase of available for sale securities	—			(201.1		)	—				—				(201.1		)
Proceeds from disposition of available for sale securities	—			30.0			—				—				30.0
Intercompany loans receivable1	(205.6		)	106.0			(3.7		)		103.3				—
Net cash (used in) provided by in investing activities	(205.6		)	(120.7		)	(5.5		)		103.3				(228.5		)
Cash flows from financing activities:
Repayment of principal and redemption premium of 8.25% Senior Notes	(206.0		)	—			—				—				(206.0		)
Issuance of 5.875% Senior Notes	375.0			—			—				—				375.0
Cash paid for debt issuance costs	(6.8		)	—			—				—				(6.8		)
Proceeds from stock option exercises	1.0			—			—				—				1.0
Repayment of capital lease	—			—			(0.1		)		—				(0.1		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.8		)	—			—				—				(2.8		)
Repurchase of common stock	(13.6		)	—			—				—				(13.6		)
Cash dividends and dividend equivalents paid	(24.4		)	—			—				—				(24.4		)
Cash dividends paid to Parent	—			(200.0		)	—				200.0				—
Intercompany loans payable1	(106.5		)	209.3			0.5				(103.3		)		—
Net cash provided by financing activities	15.9			9.3			0.4			—	96.7			—	122.3
Net (decrease) increase in cash, cash equivalents and restricted cash during the period	—			(2.1		)	3.3				—				1.2
Cash, cash equivalents and restricted cash at beginning of period	—			83.0			0.7				—				83.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	80.9		$	4.0			$	—			$	84.9

________________

¹  As a result of the Parent's additional liquidity associated with the 5.875% Senior Notes (see Note 3), we classify all intercompany receivables and payables as Intercompany loans receivable and Intercompany loans payable, respectively, and therefore categorize changes in these balances within the investing and financing sections, respectively, of the Condensed Consolidating Statement of Cash Flows.

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Subsequent Events

9 Months Ended

Sep. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Dividend Declaration. On October 12, 2017, we announced that our Board of Directors declared a cash dividend of $0.50 per common share. As such, we expect to pay approximately $8.5 million (including dividend equivalents) on or about November 15, 2017 to stockholders of record and the holders of certain restricted stock units at the close of business on October 25, 2017.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

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 2017 fiscal year. The financial information as of December 31, 2016 is derived from our audited consolidated financial statements and footnotes included in our Annual Report on Form 10-K for the year ended December 31, 2016.

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 a lower of cost or market inventory write-down of $4.9 million as a result of a decrease in our net realizable value of inventory. 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. There were no additional lower of cost or market inventory adjustments since the quarter ended March 31, 2016.

Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At September 30, 2017, the current cost of inventory exceeded its stated LIFO value by $12.5 million. At December 31, 2016, the stated LIFO value of our inventory represented its net realizable value (less a normal profit margin) and exceeded the current cost of our inventory by $8.5 million. Other inventories are stated on the first-in, first-out basis and consist of operating supplies, which are materials and supplies to be consumed during the production process. Inventory costs consist of material, labor and manufacturing overhead, including depreciation. Abnormal costs, such as idle facility expenses, freight, handling costs and spoilage, are accounted for as current period charges. All of our inventories at September 30, 2017 and December 31, 2016 were included in the Fabricated Products segment (see Note 2 for the components of inventories).

Replacement Parts

Replacement Parts. Replacement parts consist of preventative maintenance and capital spare parts, which are stated on the first-in, first-out basis. Replacement parts are recorded within Prepaid expenses and other current assets or Other assets depending on whether or not the expected utilization of the replacement parts is to occur within the current operating cycle.

Property, Plant and Equipment - Net

Property, Plant and Equipment, Net. Property, plant and equipment, net is recorded at cost and includes construction in progress (see Note 2). Interest related to the construction of qualifying assets is capitalized as part of the construction costs. The amount of interest expense capitalized as construction in progress was $0.7 million and $0.6 million during the quarters ended September 30, 2017 and September 30, 2016, respectively. The amount of interest expense capitalized as construction in progress was $1.9 million and $2.4 million during the nine months endedSeptember 30, 2017 and September 30, 2016, 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.

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.

Self Insurance of Employee Health and Workers' Compensation Liabilities

Self Insurance of Workers' Compensation and Employee Healthcare Liabilities. We self-insure the majority of the costs of workers' compensation benefits and employee healthcare benefits and rely on insurance coverage to protect us from large losses on individual claims. Workers' compensation liabilities are based on a combination of estimates for: (i) incurred-but-not-reported claims and (ii) the ultimate expense of incurred claims. Such estimates are based on judgment, using our historical claims data and information and analysis provided by actuarial and claims advisors, our insurance carriers and other professionals. Our undiscounted workers' compensation liabilities were estimated at $26.6 million and $26.8 million for the periods ended September 30, 2017 and December 31, 2016, respectively. However, we account for our workers' compensation accrued liability on a discounted basis, using a discount rate of 2.00% at both September 30, 2017 and December 31, 2016. Accrued liabilities for employee healthcare benefits, which are estimates of unpaid incurred medical and prescription drug costs as provided by our healthcare administrators, were $3.3 million and $3.6 million as of September 30, 2017 and December 31, 2016, respectively.

Derivative Financial Instruments

Derivative Financial Instruments. Consistent with guidelines established by management and approved by our Board of Directors, we use derivative financial instruments to mitigate our exposure to changes in the market price of aluminum, alloying metals and energy and, to a lesser extent, foreign currency exchange rates. We do not use derivative financial instruments for trading or other speculative purposes. Hedging transactions are executed centrally on behalf of all of our operations to minimize transaction costs, monitor consolidated net exposures and allow for increased responsiveness to changes in market factors.

We reflect the fair value of all of our derivative instruments on our Consolidated Balance Sheets (see Note 9). The carrying values of hedges settling within one year are included in Prepaid expenses and other current assets or Other accrued liabilities. Carrying values for hedges settling beyond one year are included in Other assets or Long-term liabilities.

We do not meet the documentation requirements for hedge (deferral) accounting related to aluminum and energy derivatives. Accordingly, we record unrealized gain or loss associated with these hedges in the Statements of Consolidated Income within Unrealized gain on derivative instruments. As such derivatives settle, we reverse any previously recorded unrealized gain or loss associated with these hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

Forward swap contracts for zinc and copper ("Alloy Hedges") used in our fabrication operations are designated and qualify as cash flow hedges. Unrealized gain and loss associated with the Alloy Hedges are deferred in Other comprehensive income, net of tax. As Alloy Hedges settle, we reverse any unrealized gain or loss previously recorded within Other comprehensive income, net of tax associated with settling Alloy Hedges and record the realized gain or loss within Cost of products sold, excluding depreciation and amortization and other items.

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. Some of these derivative contracts qualify for cash flow hedge accounting and are designated as cash flow hedges. The remainder are non-designated hedges. Both realized and unrealized gains and losses of foreign currency forward contracts designated as cash flow hedges are deferred in Accumulated other comprehensive loss and, over the period that the underlying equipment is depreciated, realized gains and losses are recorded as an adjustment to depreciation expense. For non-designated foreign currency forward contracts, gains and losses (both unrealized and realized) are reflected as an increase or reduction in Other income (expense), net.

Fair Value Measurements

Fair Value Measurements. We apply the fair value hierarchy established by GAAP for the recognition and measurement of certain financial assets and liabilities. An asset or liability's fair value classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and consider counterparty risk in our assessment of fair value.

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 each period include our derivative instruments and available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 6). Additionally, we measure at fair value once each year at December 31 the plan assets of the Salaried VEBA (defined in Note 6) and our Canadian defined benefit pension plan. We record our remaining financial assets and liabilities at carrying value.

For a majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, we are not required to measure their 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 will be required, which could result in a reduction to the carrying amount of such asset or liability. See Note 4 for a discussion of the goodwill impairment charge recorded during the three months ended June 30, 2017 related to the operations at our Chandler, Arizona (Extrusion) facility.

We concluded that none of our other 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 quarter and nine months endedSeptember 30, 2017.

New Accounting Pronouncements

New Accounting Pronouncements. Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), 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. In August 2015, ASU 2014-09 was amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 by one year for all entities and permits early adoption on a limited basis. ASU 2014-09 was subsequently amended by four additional pronouncements: (i) ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; (ii) ASU No. 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting; (iii) ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; and (iv) ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements to Topic 606.

We have evaluated the impacts on our financial reporting of adopting ASU 2014-09, including its subsequent amendments discussed above (together "ASC 606"), and have regularly reported our findings and implementation readiness to the Audit Committee and internal stakeholders. We plan to adopt ASC 606 using the modified retrospective transition approach for the fiscal year ending December 31, 2018, with the cumulative-effect adjustment recognized in beginning Retained earnings. In calculating the cumulative-effect adjustment, we will only apply the guidance to contracts not completed at the date of adoption. The primary change to our accounting policies upon adopting ASC 606 will relate to the timing of when revenue is recognized. While revenue from sales of certain contracts will continue to be recognized at a point in time, revenue from other contracts will be required to be recognized over time. Upon adoption, a majority of our Aero/HS products and a substantial portion of our Automotive Extrusions will convert to over time recognition. For these products, we will accelerate revenue recognition throughout the production process whereas previously we did not recognize revenue until the product shipped or reached its destination, based on the transfer of risks and title. We are still finalizing our assessment of the specific dollar impact that over-time recognition will have on our consolidated financial statements. After the cumulative-effect adjustment, however, we do not believe it will have a material effect on revenue recognized compared to current accounting during any given period.

We do not believe the adoption of ASC 606 will result in: (i) a change in the number of distinct performance obligations within our contractual arrangements; (ii) a change in our current capitalization and deferral policies; (iii) a change in our accounting for contract acquisition and fulfillment costs; (iv) the addition of any contract liability balances; or (v) the adjustment of the amount of promised consideration from our customers for the effects of significant financing components. Additionally, we plan to account for shipping and handling activities that occur after the customer has obtained control of a product as fulfillment activities (i.e., an expense) rather than as a promised service (i.e., a revenue element).

As of September 30, 2017, we have: (i) finalized our review of most of our customer contracts; (ii) completed most of the system updates to track information needed to apply ASC 606; and (iii) trained internal stakeholders on the pending changes to revenue recognition policies and work procedures. We expect to complete our implementation work in time to adopt ASC 606 for periods starting after December 31, 2017.

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 assessing the impact and expect the adoption of this ASU in 2019 to have a material impact on our consolidated financial statements.

ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"), was issued in August 2017. The amendments under ASU 2017-12 refine and expand hedge accounting requirements for both financial (e.g., interest rate) and commodity risks. Its provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also makes certain targeted improvements to simplify the application of hedge accounting guidance. ASU 2017-12 becomes effective for us in the first quarter of 2019. We are currently assessing the impact the adoption of this ASU will have on our consolidated financial statements.

We do not anticipate any material impact on our consolidated financial statements upon the adoption of the following accounting pronouncements: (i) ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities;(ii) ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments; (iii) ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost; and (iv) ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.

There were no material impacts on our consolidated financial statements resulting from our early adoption in the first quarter of 2017 of the following accounting pronouncements: (i) ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; (ii) ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash;and (iii) ASU No. 2017-04, Intangibles - Goodwill and Other(Topic 350): Simplifying the Test for Goodwill Impairment.

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Supplemental Balance Sheet Information Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Disclosures [Text Block]

	September 30, 2017		December 31, 2016
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	17.3	$	37.9
Commercial paper	56.6		17.3
Total	$	73.9	$	55.2

	September 30, 2017			December 31, 2016
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	138.8		$	138.2
Unbilled trade receivables	0.2			0.3
Trade receivables, gross	139.0			138.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	138.2		$	137.7
Inventories
Finished products	$	64.8		$	73.8
Work-in-process	86.1			71.7
Raw materials	56.9			51.1
Operating supplies	4.4			5.0
Total	$	212.2		$	201.6
Property, Plant and Equipment, Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	90.2			88.6
Machinery and equipment	675.0			615.1
Construction in progress	27.8			34.8
Property, plant and equipment, gross	815.7			761.2
Accumulated depreciation	(258.2		)	(230.6		)
Assets held for sale	0.3			0.3
Property, plant and equipment, net	$	557.8		$	530.9
Other Accrued Liabilities
Uncleared cash disbursements	$	7.1		$	5.8
Accrued income taxes and taxes payable	9.0			4.3
Accrued annual contribution to VEBAs	12.0			20.0
Accrued interest	8.4			2.9
Other	6.8			7.1
Total	$	43.3		$	40.1
Long-Term Liabilities
Workers' compensation accruals	$	25.0		$	25.0
Long-term environmental accrual – Note 8	16.1			15.8
Long-term portion of contingent contribution to Union VEBA – Note 6	—			12.8
Other long-term liabilities	20.8			19.6
Total	$	61.9		$	73.2

Supplemental Balance Sheet Information

	September 30, 2017		December 31, 2016
	(In millions of dollars)
Cash and Cash Equivalents
Cash and money market funds	$	17.3	$	37.9
Commercial paper	56.6		17.3
Total	$	73.9	$	55.2

	September 30, 2017			December 31, 2016
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	138.8		$	138.2
Unbilled trade receivables	0.2			0.3
Trade receivables, gross	139.0			138.5
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	138.2		$	137.7
Inventories
Finished products	$	64.8		$	73.8
Work-in-process	86.1			71.7
Raw materials	56.9			51.1
Operating supplies	4.4			5.0
Total	$	212.2		$	201.6
Property, Plant and Equipment, Net
Land and improvements	$	22.7		$	22.7
Buildings and leasehold improvements	90.2			88.6
Machinery and equipment	675.0			615.1
Construction in progress	27.8			34.8
Property, plant and equipment, gross	815.7			761.2
Accumulated depreciation	(258.2		)	(230.6		)
Assets held for sale	0.3			0.3
Property, plant and equipment, net	$	557.8		$	530.9
Other Accrued Liabilities
Uncleared cash disbursements	$	7.1		$	5.8
Accrued income taxes and taxes payable	9.0			4.3
Accrued annual contribution to VEBAs	12.0			20.0
Accrued interest	8.4			2.9
Other	6.8			7.1
Total	$	43.3		$	40.1
Long-Term Liabilities
Workers' compensation accruals	$	25.0		$	25.0
Long-term environmental accrual – Note 8	16.1			15.8
Long-term portion of contingent contribution to Union VEBA – Note 6	—			12.8
Other long-term liabilities	20.8			19.6
Total	$	61.9		$	73.2

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Income Tax Matters (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Tax Provision

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Domestic	$	15.7	$	9.1	$	35.8	$	39.5
Foreign	0.4		0.3		1.0		0.7
Total	$	16.1	$	9.4	$	36.8	$	40.2

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Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Schedule of (Income) Charges Related to Benefit Plans

The following table presents the components of Net periodic postretirement benefit cost relating to Salaried VEBA for the periods presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA1:
Interest cost	$	0.8		$	0.7		$	2.3		$	2.2
Expected return on plan assets	(1.0		)	(1.0		)	(3.1		)	(3.0		)
Amortization of prior service cost	1.2			1.0			3.6			3.0
Amortization of net actuarial loss	0.2			0.1			0.6			0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	$	1.2		$	0.8		$	3.4		$	2.5

____________

¹  The service cost was insignificant for all periods presented.

The following table presents the total charges (income) related to all benefit plans for the periods presented (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017			2016
Included within Fabricated Products:
Deferred compensation plan	$	0.1	$	0.1	$	0.3		$	0.2
Defined contribution plans	1.3		1.6		6.8			6.7
Multiemployer pension plans	1.1		1.2		3.4			3.5
Total Fabricated Products	$	2.5	$	2.9	$	10.5		$	10.4
Included within All Other:
Deferred compensation plan	0.4		0.4		1.1			0.6
Defined contribution plans	0.1		0.1		0.7			0.7
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2		0.8		3.4			2.5
Loss (gain) on removal of Union VEBA net assets	0.5		—		(0.8		)	(0.1		)
Total All Other	$	2.2	$	1.3	$	4.4		$	3.7
Total	$	4.7	$	4.2	$	14.9		$	14.1

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Employee Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2017

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

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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares and restricted stock units	$	1.4	$	1.2	$	3.9	$	3.5
TSR-Based Performance Shares	1.2		1.5		3.7		4.0
CP-Based Performance Shares	0.8		0.4		2.0		0.9
EVA-Based Performance Shares	0.2		—		0.4		0.3
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Fabricated Products	$	1.3	$	1.2	$	3.8	$	3.1
All Other	2.3		1.9		6.2		5.6
Total non-cash compensation expense	$	3.6	$	3.1	$	10.0	$	8.7

Unrecognized gross compensation cost data

The following table presents unrecognized gross compensation cost data by type of award as of September 30, 2017:

	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	$	9.6	2.6
TSR-Based Performance Shares	$	5.6	1.7
CP-Based Performance Shares	$	6.1	2.1
EVA-Based Performance Shares	$	1.5	2.4

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, TSR-Based Performance Shares, CP-Based Performance Shares and EVA-Based Performance Shares for the nine months endedSeptember 30, 2017 is as follows:

	Non-Vested Common Shares				Restricted Stock Units				TSR-Based Performance Shares				CP-Based Performance Shares				EVA-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, 2016	114,658		$	69.51	61,800		$	74.94	394,525		$	90.30	63,678		$	80.46	—		$	—
Granted1	11,817		86.92		92,275		76.13		65,044		97.88		65,044		79.69		32,504		79.69
Vested	(46,689	)	71.46		(8,655	)	76.94		(94,082	)	83.18		—		—		—		—
Forfeited1	(427	)	69.83		(6,412	)	77.70		(5,519	)	95.88		(3,342	)	79.92		(1,164	)	79.69
Canceled1	—		—		—		—		(55,288	)	83.18		—		—		—		—
Outstanding at September 30, 2017	79,359		$	70.96	139,008		$	75.72	304,680		$	95.31	125,380		$	80.07	31,340		$	79.69

____________

¹  For 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 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Non-vested common shares	$	—	$	—	$	86.92	$	86.11
Restricted stock units	$	82.33	$	—	$	76.13	$	75.57
TSR-Based Performance Shares	$	—	$	—	$	97.88	$	93.02
CP-Based Performance Shares	$	—	$	—	$	79.69	$	80.46
EVA-Based Performance Shares	$	—	$	—	$	79.69	$	—

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Derivatives, Hedging Programs and Other Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of material derivative positions

The following table summarizes our derivative positions at September 30, 2017:

Aluminum	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Purchased put option contracts	10/17 through 12/17	13.4
Fixed price purchase contracts	10/17 through 12/21	151.9
Fixed price sales contracts	10/17 through 11/19	1.8
Midwest premium swap contracts1	10/17 through 12/21	150.1

Alloying Metals	Maturity Period (month/year)	Notional Amount of contracts (mmlbs)
Fixed price purchase contracts	10/17 through 6/18	4.6

Natural Gas2	Maturity Period (month/year)	Notional Amount of contracts (mmbtu)
Fixed price purchase contracts	10/17 through 12/20	3,650,000

Euro	Maturity Period (month/year)	Notional Amount of contracts (euro)
Fixed price purchase contracts	10/17 through 4/18	301,304

______________________

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 September 30, 2017, we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 72% of the expected natural gas purchases for the remainder of 2017, 71% of the expected natural gas purchases for both 2018 and 2019 and 39% of the expected natural gas purchases for 2020.

Summary of realized and unrealized gains and losses

Realized and unrealized (gain) loss included on the Statements of Consolidated Income associated with all derivative contracts consisted of the following for each period presented (in millions of dollars):

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Realized (gain) loss:
Aluminum	$	(4.0	)	$	0.4		$	(13.8	)	$	4.1
Natural gas	0.2			0.9			0.3			4.2
Alloy Hedges	(0.3		)	—			(0.2		)	—
Foreign exchange	(0.1		)	—			(0.1		)	—
Total realized (gain) loss1	$	(4.2	)	$	1.3		$	(13.8	)	$	8.3
Unrealized (gain) loss:
Aluminum	$	(10.6	)	$	(1.7	)	$	(15.3	)	$	(11.7	)
Natural gas	(0.2		)	(0.3		)	1.3			(5.2		)
Total unrealized gain2	$	(10.8	)	$	(2.0	)	$	(14.0	)	$	(16.9	)

______________________

¹  Recorded within Cost of products sold, excluding depreciation, amortization and other items within the Fabricated Products segment.

²  Recorded within Unrealized gain on derivative instruments within the Fabricated Products segment.

Fair Value of Derivative Assets and Liabilities Measured on 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):

	September 30, 2017
	Level 1		Level 2		Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	18.4	$	—	$	18.4
Midwest premium swap contracts	—		0.8		—		0.8
Natural gas – Fixed price purchase contracts	—		0.4		—		0.4
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		0.9		—		0.9
Total derivative assets1	$	—	$	20.5	$	—	$	20.5

	September 30, 2017
	Level 1		Level 2			Level 3		Total
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price sales contracts	$	—	$	(0.1	)	$	—	$	(0.1	)
Midwest premium swap contracts	—		(0.8		)	—		(0.8		)
Natural gas – Fixed price purchase contracts	—		(0.5		)	—		(0.5		)
Total derivative liabilities2	$	—	$	(1.4	)	$	—	$	(1.4	)

____________

¹  Of the $20.5 million in total derivative assets, $15.8 million and $4.7 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.4 million in total derivative liabilities, $0.9 million and $0.5 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

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, 2016
	Level 1		Level 2			Level 3		Total
DERIVATIVE ASSETS:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	3.3		$	—	$	3.3
Midwest premium swap contracts	—		0.9			—		0.9
Natural gas – Fixed price purchase contracts	—		1.6			—		1.6
Total derivative assets1	$	—	$	5.8		$	—	$	5.8
DERIVATIVE LIABILITIES:
Non-Designated Hedges:
Aluminum –
Fixed price purchase contracts	$	—	$	(1.1	)	$	—	$	(1.1	)
Midwest premium swap contracts	—		(0.2		)	—		(0.2		)
Natural gas – Fixed price purchase contracts	—		(0.4		)	—		(0.4		)
Designated Hedges:
Alloying metals – Fixed price purchase contracts	—		(0.1		)	—		(0.1		)
Total derivative liabilities2	$	—	$	(1.8	)	$	—	$	(1.8	)

____________

¹  Of the $5.8 million in total derivative assets, $5.0 million and $0.8 million were recorded within Prepaid expenses and other current assets and Other assets, respectively.

²  Of the $1.8 million in total derivative liabilities, $0.8 million and $1.0 million were recorded within Other accrued liabilities and Long-term liabilities, respectively.

Offsetting Assets

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

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	3.3	$	—	$	3.3	$	1.0	$	2.3
Counterparty (with partial netting agreements)	2.5		—		2.5		0.7		1.8
Total	$	5.8	$	—	$	5.8	$	1.7	$	4.1

The following tables present offsetting information regarding our derivatives by type of counterparty as of September 30, 2017 (in millions of dollars):

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets		Net Amount
Counterparty (with netting agreements)	$	20.5	$	—	$	20.5	$	1.4	$	19.1
Total	$	20.5	$	—	$	20.5	$	1.4	$	19.1

Offseting Liabilities

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.0	)	$	—	$	(1.0	)	$	(1.0	)	$	—
Counterparty (with partial netting agreements)	(0.8		)	—		(0.8		)	(0.7		)	(0.1		)
Total	$	(1.8	)	$	—	$	(1.8	)	$	(1.7	)	$	(0.1	)

	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets			Gross Amounts Not Offset in the Consolidated Balance Sheets			Net Amount
Counterparty (with netting agreements)	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—
Total	$	(1.4	)	$	—	$	(1.4	)	$	(1.4	)	$	—

Fair Value, Non-Derivative Assets Measured on Recurring Basis

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of September 30, 2017 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.3	$	56.6	$	—	$	73.9
Short-term investments	—		191.4		—		191.4
Total	$	17.3	$	248.0	$	—	$	265.3

The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of December 31, 2016 (in millions of dollars):

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	37.9	$	17.3	$	—	$	55.2
Short-term investments	—		231.0		—		231.0
Total	$	37.9	$	248.3	$	—	$	286.2

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Net Income Per Share and Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Calculation of basic and diluted earnings per share

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Numerator:
Net income	$	19.9	$	14.9	$	60.6	$	67.2
Denominator – Weighted-average common shares outstanding (in thousands):
Basic1	16,834		17,841		17,072		17,858
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options	326		334		291		323
Diluted2	17,160		18,175		17,363		18,181
Net income per common share, Basic:	$	1.18	$	0.84	$	3.55	$	3.76
Net income per common share, Diluted:	$	1.16	$	0.82	$	3.49	$	3.70

______________________

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

The following securities were excluded from the weighted-average diluted shares computation for the quarters and nine months endedSeptember 30, 2017 and September 30, 2016 as their inclusion would have been anti-dilutive (in thousands of shares):

	Quarter Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Non-vested common shares, restricted stock units and performance shares	3	3	3	2
Total excluded	3	3	3	2

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Segment and Geographical Area Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Summary of financial information by operating segment

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Net sales:
Fabricated Products	$	332.8		$	320.6		$	1,044.4		$	998.7
Segment operating income (loss):
Fabricated Products	$	53.7		$	42.1		$	149.9		$	172.1
All Other	(13.9		)	(12.3		)	(39.2		)	(39.6		)
Total operating income	$	39.8		$	29.8		$	110.7		$	132.5
Interest expense	(5.3		)	(5.5		)	(16.4		)	(14.7		)
Other income (expense), net	1.5			—			3.1			(10.4		)
Income before income taxes	$	36.0		$	24.3		$	97.4		$	107.4
Depreciation and amortization:
Fabricated Products	$	10.1		$	8.8		$	28.9		$	26.2
All Other	0.1			0.2			0.4			0.5
Total depreciation and amortization	$	10.2		$	9.0		$	29.3		$	26.7
Capital expenditures:
Fabricated Products	$	16.3		$	15.0		$	55.7		$	57.1
All Other	0.1			0.1			0.4			0.3
Total capital expenditures	$	16.4		$	15.1		$	56.1		$	57.4

	September 30, 2017		December 31, 2016
Assets:
Fabricated Products	$	1,007.9	$	969.4
All Other1	414.8		474.1
Total assets	$	1,422.7	$	1,443.5

_____________________

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 for the Fabricated Products segment by end market applications were as follows (in millions of dollars):

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Net sales:
Aero/HS products	$	150.2	$	156.1	$	483.2	$	500.7
Automotive Extrusions	52.7		46.5		161.6		143.6
GE products	115.9		105.6		361.1		318.3
Other products	14.0		12.4		38.5		36.1
Total net sales	$	332.8	$	320.6	$	1,044.4	$	998.7

Schedule of income taxes paid by geographical area

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

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Income taxes paid:
Domestic	$	0.3	$	0.1	$	0.7	$	0.4
Foreign	—		—		0.1		0.5
Total income taxes paid	$	0.3	$	0.1	$	0.8	$	0.9

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 was as follows:

	Quarter Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Percentage of total primary aluminum supply (lbs):
Supply from our top five major suppliers	86	%	84	%	85	%	84	%
Supply from our largest supplier	35	%	28	%	36	%	32	%
Supply from our second and third largest suppliers	35	%	33	%	33	%	31	%

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Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Nine Months Ended
	September 30,
	2017		2016
	(In millions of dollars)
Interest paid	$	10.0	$	6.7
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	3.4	$	2.4
Stock repurchases not yet settled	$	—	$	0.2
Acquisition of property and equipment through capital leasing arrangements	$	0.3	$	—
Components of cash, cash equivalents and restricted cash:	September 30, 2017		September 30, 2016
Cash and cash equivalents	$	73.9	$	72.9
Restricted cash included in Prepaid expenses and other current assets1	0.3		0.3
Restricted cash included in Other assets1	12.9		11.7
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$	87.1	$	84.9

____________

¹  We are required to keep on deposit certain amounts that are pledged or held as collateral relating to workers' compensation and other agreements. We account for such deposits as restricted cash. From time to time, such restricted funds could be returned to us or we could be required to pledge additional cash.

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Other Income, Net (Tables)

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Other Income (Expense), Net

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

	Quarter Ended					Nine Months Ended
	September 30,					September 30,
	2017		2016			2017		2016
Interest income	$	—	$	—		$	—	$	0.1
Realized gain on investments	0.8		0.1			2.2		0.4
Loss on extinguishment of debt1	—		—			—		(11.1		)
All other income (expense), net	0.7		(0.1		)	0.9		0.2
Other income (expense), net	$	1.5	$	—		$	3.1	$	(10.4	)

____________

¹  Represents the loss on extinguishment of our 8.25% Senior Notes during the nine months ended September 30, 2016, which included an $8.2 million premium paid to redeem the notes and a $2.9 million write-off of unamortized debt issuance costs associated with the notes.

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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Salaried VEBA and defined benefit pension plan:
Beginning balance	$	(35.4	)	$	(29.8	)	$	(37.1	)	$	(31.3	)
Amortization of net actuarial loss1	0.2			0.1			0.6			0.3
Amortization of prior service cost1	1.2			1.0			3.6			3.0
Less: income tax expense2	(0.5		)	(0.4		)	(1.6		)	(1.2		)
Net amortization reclassified from AOCI to Net income	0.9			0.7			2.6			2.1
Translation impact on Canadian pension plan AOCI balance	(0.1		)	—			(0.1		)	0.1
Other comprehensive income, net of tax	0.8			0.7			2.5			2.2
Ending balance	$	(34.6	)	$	(29.1	)	$	(34.6	)	$	(29.1	)
Available for sale securities:
Beginning balance	$	1.1		$	0.2		$	0.8		$	(0.1	)
Unrealized gain on available for sale securities	1.0			0.9			3.1			1.3
Less: income tax expense	(0.4		)	(0.4		)	(1.2		)	(0.5		)
Net unrealized gain on available for sale securities	0.6			0.5			1.9			0.8
Reclassification of unrealized gain upon sale of available for sale securities3	(0.5		)	(0.3		)	(2.1		)	(0.3		)
Less: income tax benefit2	0.2			0.1			0.8			0.1
Net unrealized gain reclassified from AOCI to Net income	(0.3		)	(0.2		)	(1.3		)	(0.2		)
Other comprehensive income, net of tax	0.3			0.3			0.6			0.6
Ending balance	$	1.4		$	0.5		$	1.4		$	0.5
Other:
Beginning balance	$	—		$	(0.3	)	$	(0.4	)	$	(0.3	)
Unrealized gain	1.1			0.1			1.4			0.2
Less: income tax expense	(0.4		)	—			(0.5		)	(0.1		)
Net gain	0.7			0.1			0.9			0.1
Gain reclassified from AOCI to Net income	(0.3		)	—			—			—
Less: income tax benefit2	0.1			—			—			—
Net gain reclassified from AOCI to Net income	(0.2		)	—			—			—
Other comprehensive income, net of tax	0.5			0.1			0.9			0.1
Ending balance	$	0.5		$	(0.2	)	$	0.5		$	(0.2	)
Total AOCI ending balance	$	(32.7	)	$	(28.8	)	$	(32.7	)	$	(28.8	)

________________

¹  Amounts reclassified out of AOCI relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.

²  Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.

³  Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.

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Condensed Guarantor and Non-Guarantor Financial Information (Tables)

9 Months Ended

Sep. 30, 2017

Guarantor and Non-Guarantor Financial Statement [Abstract]

Condensed Financial Statements

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

September 30, 2017

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	70.7	$	3.2	$	—		$	73.9
Short-term investments	—		191.4		—		—			191.4
Receivables:
Trade receivables, net	—		133.1		5.1		—			138.2
Intercompany loans receivable	55.6		0.1		0.6		(56.3		)	—
Other	—		14.6		0.8		—			15.4
Inventories	—		208.5		8.6		(4.9		)	212.2
Prepaid expenses and other current assets	0.1		31.0		0.4		—			31.5
Total current assets	55.7		649.4		18.7		(61.2		)	662.6
Investments in and advances to subsidiaries	1,107.0		41.9		—		(1,148.9		)	—
Property, plant and equipment, net	—		527.6		30.2		—			557.8
Long-term intercompany loans receivable	—		—		10.5		(10.5		)	—
Deferred tax assets, net	—		113.9		—		4.8			118.7
Intangible assets, net	—		25.3		—		—			25.3
Goodwill	—		18.8		—		—			18.8
Other assets	—		39.5		—		—			39.5
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	1.4	$	86.8	$	6.2	$	—		$	94.4
Intercompany loans payable	—		56.2		0.1		(56.3		)	—
Accrued salaries, wages and related expenses	—		37.2		1.8		—			39.0
Other accrued liabilities	8.3		41.0		1.1		(7.1		)	43.3
Total current liabilities	9.7		221.2		9.2		(63.4		)	176.7
Net liabilities of Salaried VEBA	—		27.8		—		—			27.8
Deferred tax liabilities	—		—		3.3		—			3.3
Long-term intercompany loans payable	—		10.5		—		(10.5		)	—
Long-term liabilities	—		59.3		2.6		—			61.9
Long-term debt	369.4		—		—		—			369.4
Total liabilities	379.1		318.8		15.1		(73.9		)	639.1
Total stockholders' equity	783.6		1,097.6		44.3		(1,141.9		)	783.6
Total	$	1,162.7	$	1,416.4	$	59.4	$	(1,215.8	)	$	1,422.7

CONDENSED CONSOLIDATING BALANCE SHEET

(In millions of dollars)

December 31, 2016

	Parent		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	52.9	$	2.3		$	—		$	55.2
Short-term investments	—		231.0		—			—			231.0
Receivables:
Trade receivables, net	—		133.1		4.6			—			137.7
Intercompany receivables	85.8		0.1		0.6			(86.5		)	—
Other	—		11.4		0.5			—			11.9
Inventories	—		197.5		8.0			(3.9		)	201.6
Prepaid expenses and other current assets	0.1		18.0		0.9			(0.5		)	18.5
Total current assets	85.9		644.0		16.9			(90.9		)	655.9
Investments in and advances to subsidiaries	1,012.4		40.1		—			(1,052.5		)	—
Property, plant and equipment, net	—		499.5		31.4			—			530.9
Long-term intercompany receivables	80.2		—		4.9			(85.1		)	—
Deferred tax assets, net	—		154.9		—			4.8			159.7
Intangible assets, net	—		26.4		—			—			26.4
Goodwill	—		37.2		—			—			37.2
Other assets	—		33.4		—			—			33.4
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	2.2	$	68.9	$	4.7		$	—		$	75.8
Intercompany payable	—		86.4		0.1			(86.5		)	—
Accrued salaries, wages and related expenses	—		47.2		1.9			—			49.1
Other accrued liabilities	2.9		52.6		(0.7		)	(14.7		)	40.1
Total current liabilities	5.1		255.1		6.0			(101.2		)	165.0
Net liabilities of Salaried VEBA	—		28.6		—			—			28.6
Deferred tax liabilities	—		—		3.3			—			3.3
Long-term intercompany payable	—		85.1		—			(85.1		)	—
Long-term liabilities	—		70.5		2.7			—			73.2
Long-term debt	368.7		—		—			—			368.7
Total liabilities	373.8		439.3		12.0			(186.3		)	638.8
Total stockholders' equity	804.7		996.2		41.2			(1,037.4		)	804.7
Total	$	1,178.5	$	1,435.5	$	53.2		$	(1,223.7	)	$	1,443.5

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	325.9		$	26.3		$	(19.4	)	$	332.8
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			261.6			24.0			(18.4		)	267.2
Unrealized gain on derivative instruments	—			(10.8		)	—			—			(10.8		)
Depreciation and amortization	—			9.7			0.5			—			10.2
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	1.0			23.5			0.8			(0.6		)	24.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			1.2			—			—			1.2
Loss on removal of Union VEBA net assets	—			0.5			—			—			0.5
Total selling, general, administrative, research and development	1.0			25.2			0.8			(0.6		)	26.4
Total costs and expenses	1.0			285.7			25.3			(19.0		)	293.0
Operating (loss) income	(1.0		)	40.2			1.0			(0.4		)	39.8
Other (expense) income:
Interest expense	(5.0		)	(0.4		)	—			0.1			(5.3		)
Other income, net	—			1.3			0.3			(0.1		)	1.5
(Loss) income before income taxes	(6.0		)	41.1			1.3			(0.4		)	36.0
Income tax provision	—			(18.0		)	(0.4		)	2.3			(16.1		)
Earnings in equity of subsidiaries	25.9			0.6			—			(26.5		)	—
Net income	$	19.9		$	23.7		$	0.9		$	(24.6	)	$	19.9
Comprehensive income	$	21.5		$	25.3		$	0.9		$	(26.2	)	$	21.5

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	1,019.7		$	85.4		$	(60.7	)	$	1,044.4
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			805.8			75.0			(58.1		)	822.7
Unrealized gain on derivative instruments	—			(14.0		)	—			—			(14.0		)
Depreciation and amortization	—			27.7			1.6			—			29.3
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.4			67.2			5.7			(1.6		)	74.7
Net periodic postretirement benefit cost relating to Salaried VEBA	—			3.4			—			—			3.4
Gain on removal of Union VEBA net assets	—			(0.8		)	—			—			(0.8		)
Total selling, general, administrative, research and development	3.4			69.8			5.7			(1.6		)	77.3
Goodwill impairment	—			18.4			—			—			18.4
Total costs and expenses	3.4			907.7			82.3			(59.7		)	933.7
Operating (loss) income	(3.4		)	112.0			3.1			(1.0		)	110.7
Other (expense) income:
Interest expense	(15.3		)	(1.2		)	—			0.1			(16.4		)
Other income, net	—			2.7			0.5			(0.1		)	3.1
(Loss) income before income taxes	(18.7		)	113.5			3.6			(1.0		)	97.4
Income tax provision	—			(43.0		)	(0.9		)	7.1			(36.8		)
Earnings in equity of subsidiaries	79.3			1.8			—			(81.1		)	—
Net income	$	60.6		$	72.3		$	2.7		$	(75.0	)	$	60.6
Comprehensive income	$	64.6		$	76.3		$	2.7		$	(79.0	)	$	64.6

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Quarter Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	313.9		$	26.6		$	(19.9	)	$	320.6
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			250.0			23.7			(19.0		)	254.7
Unrealized gain on derivative instruments	—			(2.0		)	—			—			(2.0		)
Depreciation and amortization	—			8.5			0.5			—			9.0
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	0.9			24.0			1.3			(0.6		)	25.6
Net periodic postretirement benefit cost relating to Salaried VEBA	—			0.8			—			—			0.8
Total selling, general, administrative, research and development	0.9			24.8			1.3			(0.6		)	26.4
Other operating charges, net	—			2.7			—			—			2.7
Total costs and expenses	0.9			284.0			25.5			(19.6		)	290.8
Operating (loss) income	(0.9		)	29.9			1.1			(0.3		)	29.8
Other (expense) income:
Interest (expense) income	(5.7		)	0.1			—			0.1			(5.5		)
Other (expense) income, net	(0.1		)	0.1			0.1			(0.1		)	—
(Loss) income before income taxes	(6.7		)	30.1			1.2			(0.3		)	24.3
Income tax provision	—			(11.6		)	(0.3		)	2.5			(9.4		)
Earnings in equity of subsidiaries	21.6			0.7			—			(22.3		)	—
Net income	$	14.9		$	19.2		$	0.9		$	(20.1	)	$	14.9
Comprehensive income	$	16.0		$	20.3		$	0.9		$	(21.2	)	$	16.0

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net sales	$	—		$	976.9		$	80.6		$	(58.8	)	$	998.7
Costs and expenses:
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	—			753.1			70.3			(56.3		)	767.1
Lower of cost or market inventory write-down	—			4.9			—			—			4.9
Unrealized gain on derivative instruments	—			(16.9		)	—			—			(16.9		)
Depreciation and amortization	—			25.2			1.5			—			26.7
Selling, general, administrative, research and development:
Selling, general, administrative, research and development	3.3			71.4			6.5			(2.0		)	79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	—			2.5			—			—			2.5
Gain on removal of Union VEBA net assets	—			(0.1		)	—			—			(0.1		)
Total selling, general, administrative, research and development	3.3			73.8			6.5			(2.0		)	81.6
Other operating charges, net	—			2.8			—			—			2.8
Total costs and expenses	3.3			842.9			78.3			(58.3		)	866.2
Operating (loss) income	(3.3		)	134.0			2.3			(0.5		)	132.5
Other (expense) income:
Interest (expense) income	(15.9		)	1.1			—			0.1			(14.7		)
Other (expense) income, net	(11.1		)	0.6			0.2			(0.1		)	(10.4		)
(Loss) income before income taxes	(30.3		)	135.7			2.5			(0.5		)	107.4
Income tax provision	—			(51.1		)	(0.7		)	11.6			(40.2		)
Earnings in equity of subsidiaries	97.5			1.3			—			(98.8		)	—
Net income	$	67.2		$	85.9		$	1.8		$	(87.7	)	$	67.2
Comprehensive income	$	70.1		$	88.7		$	1.9		$	(90.6	)	$	70.1

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2017

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$	(12.8	)	$	137.4		$	6.9		$	—		$	131.5
Cash flows from investing activities:
Capital expenditures	—			(55.7		)	(0.4		)	—			(56.1		)
Purchase of available for sale securities	—			(196.0		)	—			—			(196.0		)
Proceeds from disposition of available for sale securities	—			237.2			—			—			237.2
Proceeds from disposal of property, plant and equipment	—			0.6			—			—			0.6
Intercompany loans receivable	110.4			—			(5.6		)	(104.8		)	—
Net cash provided by (used in) investing activities	110.4			(13.9		)	(6.0		)	(104.8		)	(14.3		)
Cash flows from financing activities:
Repayment of capital lease	—			(0.2		)	—			—			(0.2		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(4.5		)	—			—			—			(4.5		)
Repurchase of common stock	(66.7		)	—			—			—			(66.7		)
Cash dividends and dividend equivalents paid	(26.4		)	—			—			—			(26.4		)
Intercompany loans payable	—			(104.8		)	—			104.8			—
Net cash used in financing activities	(97.6		)	(105.0		)	—			104.8			(97.8		)
Net increase in cash, cash equivalents and restricted cash during the period	—			18.5			0.9			—			19.4
Cash, cash equivalents and restricted cash at beginning of period	—			65.1			2.6			—			67.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	83.6		$	3.5		$	—		$	87.1

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

(In millions of dollars)

Nine Months Ended September 30, 2016

	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries				Consolidating Adjustments				Consolidated
Cash flows from operating activities:
Net cash provided by operating activities	$	189.7		$	109.3		$	8.4			$	(200.0	)		$	107.4
Cash flows from investing activities:
Capital expenditures	—			(55.6		)	(1.8		)		—				(57.4		)
Purchase of available for sale securities	—			(201.1		)	—				—				(201.1		)
Proceeds from disposition of available for sale securities	—			30.0			—				—				30.0
Intercompany loans receivable1	(205.6		)	106.0			(3.7		)		103.3				—
Net cash (used in) provided by in investing activities	(205.6		)	(120.7		)	(5.5		)		103.3				(228.5		)
Cash flows from financing activities:
Repayment of principal and redemption premium of 8.25% Senior Notes	(206.0		)	—			—				—				(206.0		)
Issuance of 5.875% Senior Notes	375.0			—			—				—				375.0
Cash paid for debt issuance costs	(6.8		)	—			—				—				(6.8		)
Proceeds from stock option exercises	1.0			—			—				—				1.0
Repayment of capital lease	—			—			(0.1		)		—				(0.1		)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(2.8		)	—			—				—				(2.8		)
Repurchase of common stock	(13.6		)	—			—				—				(13.6		)
Cash dividends and dividend equivalents paid	(24.4		)	—			—				—				(24.4		)
Cash dividends paid to Parent	—			(200.0		)	—				200.0				—
Intercompany loans payable1	(106.5		)	209.3			0.5				(103.3		)		—
Net cash provided by financing activities	15.9			9.3			0.4			—	96.7			—	122.3
Net (decrease) increase in cash, cash equivalents and restricted cash during the period	—			(2.1		)	3.3				—				1.2
Cash, cash equivalents and restricted cash at beginning of period	—			83.0			0.7				—				83.7
Cash, cash equivalents and restricted cash at end of period	$	—		$	80.9		$	4.0			$	—			$	84.9

________________

¹  As a result of the Parent's additional liquidity associated with the 5.875% Senior Notes (see Note 3), we classify all intercompany receivables and payables as Intercompany loans receivable and Intercompany loans payable, respectively, and therefore categorize changes in these balances within the investing and financing sections, respectively, of the Condensed Consolidating Statement of Cash Flows.

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Summary of Significant Accounting Policies, Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Significant accounting policies
Inventory Write-down	$ 0.0	$ 0.0	$ 4.9	$ 0.0	$ 4.9
Workers Compensation Liability Undiscounted	26.6			$ 26.6		$ 26.8
Workers' Compensation Discount, Percent				2.00%		2.00%
Accrued liabilities for employee healthcare benefits	3.3			$ 3.3		$ 3.6
Fabricated Products
Significant accounting policies
Excess of current cost over the stated LIFO value of inventory	$ (12.5)			$ (12.5)		$ 8.5

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Summary of Significant Accounting Policies, Narrative, Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment
Interest Costs Capitalized	$ 0.7	$ 0.6	$ 1.9	$ 2.4

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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents
Cash and money market funds	$ 17.3	$ 37.9
Commercial paper	56.6	17.3
Total	73.9	55.2
Trade Receivables – Net
Trade receivables, gross	139.0	138.5
Allowance for doubtful receivables	(0.8)	(0.8)
Trade receivables – net	138.2	137.7
Inventories
Finished products	64.8	73.8
Work-in-process	86.1	71.7
Raw materials	56.9	51.1
Operating supplies	4.4	5.0
Total	212.2	201.6
Property, Plant and Equipment – Net
Land and improvements	22.7	22.7
Buildings and leasehold improvements	90.2	88.6
Machinery and equipment	675.0	615.1
Construction in progress	27.8	34.8
Property, plant and equipment – gross	815.7	761.2
Accumulated depreciation	(258.2)	(230.6)
Assets held for sale	0.3	0.3
Property, plant and equipment – net	557.8	530.9
Other Accrued Liabilities
Uncleared cash disbursements	7.1	5.8
Accrued income taxes and taxes payable	9.0	4.3
Accrued annual contribution to VEBAs	12.0	20.0
Accrued interest	8.4	2.9
Other	6.8	7.1
Total	43.3	40.1
Long-Term Liabilities
Workers’ compensation accruals	25.0	25.0
Long-term environmental accrual	16.1	15.8
Long-term portion of contingent contribution to Union VEBA	0.0	12.8
Other long-term liabilities	20.8	19.6
Total	61.9	73.2
Billed
Trade Receivables – Net
Trade receivables, gross	138.8	138.2
Unbilled
Trade Receivables – Net
Trade receivables, gross	$ 0.2	$ 0.3

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Debt and Credit Facility, Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jun. 01, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	May 15, 2016	Dec. 31, 2015	May 23, 2012
Debt Instrument
Unamortized Debt Issuance Expense		$ 5,600,000		$ 5,600,000
Long-term debt		$ 369,400,000		$ 369,400,000		$ 368,700,000
Senior Notes Due 2024 | Senior Notes
Debt Instrument
Debt Instrument, Face Amount							$ 375,000,000
Debt instrument contractual rate (percent)							5.875%
Debt Instrument, Interest Rate, Effective Percentage		6.10%		6.10%
Debt issuance, percentage of principal amount							100.00%
Interest Expense, Long-term Debt		$ 5,700,000	$ 5,700,000	$ 17,100,000	$ 8,800,000
Debt Instrument, Fair Value Disclosure		402,100,000		402,100,000		$ 390,800,000
Senior Notes Due 2020 | Senior Notes
Debt Instrument
Debt Instrument, Face Amount									$ 225,000,000
Debt instrument contractual rate (percent)									8.25%
Long-term debt								$ 197,800,000
Interest Expense, Long-term Debt					$ 7,100,000
Revolving Credit Facility | Line of Credit
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000		300,000,000
Line of Credit Facility, Current Borrowing Capacity		294,400,000		294,400,000
Long-term Line of Credit		0		0
Line of Credit Facility, Remaining Borrowing Capacity		286,600,000		286,600,000
Revolving Credit Facility | Letter of Credit
Debt Instrument
Long-term Line of Credit		$ 7,800,000		$ 7,800,000
On or after June 1, 2016 | Senior Notes Due 2020 | Senior Notes
Debt Instrument
Debt Instrument, Redemption Price, Percentage	104.125%
Would have been | Revolving Credit Facility | Line of Credit
Debt Instrument
Line of Credit Facility, Interest Rate at Period End		4.50%		4.50%

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Goodwill and Intangible Assets, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 18.8		$ 18.8		$ 37.2	$ 37.2
Goodwill impairment	$ 0.0	$ 0.0	$ 18.4	$ 0.0
Impairment of Intangible Assets, Finite-lived		$ 2.6

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Income Tax Matters, Provision Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Tax Provision
Domestic	$ 15.7	$ 9.1	$ 35.8	$ 39.5
Foreign	0.4	0.3	1.0	0.7
Total	$ 16.1	$ 9.4	$ 36.8	$ 40.2

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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision	$ 16.1	$ 9.4	$ 36.8	$ 40.2
Effective tax rate (percent)	44.70%	38.70%	37.80%	37.50%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 2.5		$ 2.5
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	7.10%		2.60%
Effective tax rate reconciliation, decrease due to recognition of excess tax benefits from stock-based compensation			$ (1.7)
Effective tax rate reconciliation, decrease due to recognition of excess tax benefits from stock-based compensation (percent)			(1.70%)
Effective tax rate reconciliation, decrease to the valuation allowance for certain state net operating losses			$ (0.5)
Effective tax rate reconciliation, decrease to the valuation allowance for certain state net operating losses (percent)			(0.60%)
Effective tax rate reconciliation, decrease related to unrecognized tax benefits , including interest and penalties			$ (0.2)
Effective tax rate reconciliation, decrease related to unrecognized tax benefits , including interest and penalties (percent)			(0.20%)
Gross unrecognized tax benefits	$ 1.5		$ 1.5		$ 1.8
Gross unrecognized tax benefits that would impact effective tax rate	$ 0.4		$ 0.4		$ 0.7

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Employee Benefits, Net Periodic Benefit Costs and Charges Relating To All Other Employee Benefit Plans(Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Salaried VEBA1:
Total net periodic postretirement benefit cost relating to Salaried VEBA	$ 1.2	$ 0.8	$ 3.4	$ 2.5
Gain on removal of Union VEBA net assets	0.5	0.0	(0.8)	(0.1)
Total other employee benefit plans	4.7	4.2	14.9	14.1
Fabricated Products
Salaried VEBA1:
Deferred compensation plan	0.1	0.1	0.3	0.2
Defined contribution plans	1.3	1.6	6.8	6.7
Multiemployer pension plans	1.1	1.2	3.4	3.5
Total other employee benefit plans	2.5	2.9	10.5	10.4
All Other
Salaried VEBA1:
Deferred compensation plan	0.4	0.4	1.1	0.6
Defined contribution plans	0.1	0.1	0.7	0.7
Total other employee benefit plans	2.2	1.3	4.4	3.7
VEBAs | All Other
Salaried VEBA1:
Total net periodic postretirement benefit cost relating to Salaried VEBA	1.2	0.8	3.4	2.5
Gain on removal of Union VEBA net assets	0.5	0.0	(0.8)	(0.1)
Voluntary Employees' beneficiary Association (VEBA) | VEBAs | All Other
Salaried VEBA1:
Interest cost	0.8	0.7	2.3	2.2
Expected return on plan assets	(1.0)	(1.0)	(3.1)	(3.0)
Amortization of prior service cost	1.2	1.0	3.6	3.0
Amortization of net actuarial loss	0.2	0.1	0.6	0.3
Total net periodic postretirement benefit cost relating to Salaried VEBA	$ 1.2	$ 0.8	$ 3.4	$ 2.5

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Employee Benefits, Defined Benefit Plans Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	$ 12.0	$ 20.0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
VEBA Postretirement Medical Obligations
Fair value of deferred compensation assets	9.7	$ 8.2
Voluntary Employees' beneficiary Association (VEBA) | Union VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	17.1
Maximum contribution threshold	12.8
Accrued Veba contingent contribution - total	12.0
Voluntary Employees' beneficiary Association (VEBA) | Salaried VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	2.9
Maximum contribution threshold	$ 2.9

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Employee Incentive Plans, Short Term Incentive Plans (Details) $ in Millions	Sep. 30, 2017 USD ($)
Short Term Incentive Plans
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Accrued Bonuses	$ 14.5

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Employee Incentive Plans, Compensation expense under LTI programs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3.6	$ 3.1	$ 10.0	$ 8.7
Non-vested common shares 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	9.6		9.6
Allocated Share-based Compensation Expense	1.4	1.2	$ 3.9	3.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 7 months
TSR-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	5.6		$ 5.6
Allocated Share-based Compensation Expense	1.2	1.5	$ 3.7	4.0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 8 months
CP-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	6.1		$ 6.1
Allocated Share-based Compensation Expense	0.8	0.4	$ 2.0	0.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 1 month
EVA-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	1.5		$ 1.5
Allocated Share-based Compensation Expense	0.2	0.0	$ 0.4	0.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 5 months
Fabricated Products
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1.3	1.2	$ 3.8	3.1
All Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 2.3	$ 1.9	$ 6.2	$ 5.6

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Employee Incentive Plans, Unrecognized Compensation Cost (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Non-vested common shares and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 9.6
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized	2 years 7 months
TSR-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 5.6
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized	1 year 8 months
CP-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 6.1
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized	2 years 1 month
EVA-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 1.5
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized	2 years 5 months

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Employee Incentive Plans, Summary of Activity (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Non-Vested Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)			114,658
Granted (shares)			11,817
Vested (shares)			(46,689)
Forfeited (shares)			(427)
Canceled (shares)			0
Outstanding at September 30, 2017 (shares)	79,359		79,359
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)			$ 69.51
Weighted average grant-date fair value per unit - Granted (in dollars per share)	$ 0.00	$ 0.00	86.92	$ 86.11
Weighted average grant-date fair value per unit - Vested (in dollars per share)			71.46
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)			69.83
Weighted average grant-date fair value per unit - Canceled (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Outstanding at June 30, 2017 (in dollars per share)	$ 70.96		$ 70.96
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)			61,800
Granted (shares)			92,275
Vested (shares)			(8,655)
Forfeited (shares)			(6,412)
Canceled (shares)			0
Outstanding at September 30, 2017 (shares)	139,008		139,008
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)			$ 74.94
Weighted average grant-date fair value per unit - Granted (in dollars per share)	$ 82.33	0.00	76.13	75.57
Weighted average grant-date fair value per unit - Vested (in dollars per share)			76.94
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)			77.70
Weighted average grant-date fair value per unit - Canceled (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Outstanding at June 30, 2017 (in dollars per share)	$ 75.72		$ 75.72
TSR-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)			394,525
Granted (shares)			65,044
Vested (shares)			(94,082)
Forfeited (shares)			(5,519)
Canceled (shares)			(55,288)
Outstanding at September 30, 2017 (shares)	304,680		304,680
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)			$ 90.30
Weighted average grant-date fair value per unit - Granted (in dollars per share)	$ 0.00	0.00	97.88	93.02
Weighted average grant-date fair value per unit - Vested (in dollars per share)			83.18
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)			95.88
Weighted average grant-date fair value per unit - Canceled (in dollars per share)			83.18
Weighted average grant-date fair value per unit - Outstanding at June 30, 2017 (in dollars per share)	$ 95.31		$ 95.31
CP-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)			63,678
Granted (shares)			65,044
Vested (shares)			0
Forfeited (shares)			(3,342)
Canceled (shares)			0
Outstanding at September 30, 2017 (shares)	125,380		125,380
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)			$ 80.46
Weighted average grant-date fair value per unit - Granted (in dollars per share)	$ 0.00	0.00	79.69	80.46
Weighted average grant-date fair value per unit - Vested (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)			79.92
Weighted average grant-date fair value per unit - Canceled (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Outstanding at June 30, 2017 (in dollars per share)	$ 80.07		$ 80.07
EVA-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)			0
Granted (shares)			32,504
Vested (shares)			0
Forfeited (shares)			(1,164)
Canceled (shares)			0
Outstanding at September 30, 2017 (shares)	31,340		31,340
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)			$ 0.00
Weighted average grant-date fair value per unit - Granted (in dollars per share)	$ 0.00	$ 0.00	79.69	$ 0.00
Weighted average grant-date fair value per unit - Vested (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)			79.69
Weighted average grant-date fair value per unit - Canceled (in dollars per share)			0.00
Weighted average grant-date fair value per unit - Outstanding at June 30, 2017 (in dollars per share)	$ 79.69		$ 79.69

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Employee Incentive Plans, Weighted Average Grant Date Fair Value (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	$ 0.00	$ 0.00	$ 86.92	$ 86.11
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	82.33	0.00	76.13	75.57
TSR-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	0.00	0.00	97.88	93.02
CP-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	$ 0.00	$ 0.00	$ 79.69	$ 80.46

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Employee Incentive Plans, Narrative (Details) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested outstanding stock (shares)			1,543
Exercise price (in dollars per share)			$ 80.01
Options granted during period (shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0
Shares withheld and canceled to satisfy minimum tax withholding (shares)	56,195	35,498
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares to be received (shares)	1
EVA-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
EVA-Based Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of underlying shares (percent)	0.00%
EVA-Based Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of underlying shares (percent)	200.00%
2016 LTI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for awards under the plan (shares)	735,724

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Commitments and Contingencies, Environmental (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Environmental Contingency
Environmental accrual	$ 16.9	$ 16.9
Expected period related to remediation expenditures for environmental contingencies period		30 years
Potential increase in environmental costs	$ 12.2	$ 12.2
Time period within which Companys recorded estimate of its obligation may change	12 months
Minimum
Environmental Contingency
Period for final feasibility study		12 months
Maximum
Environmental Contingency
Period for final feasibility study		15 months

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Derivatives, Hedging Programs and Other Financial Instruments, Material Derivative Positions (Details) mmlbs in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2017 EUR (€) MMBTU mmlbs
Not Designated as Hedging Instrument | Option on Securities | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount					13.4
Not Designated as Hedging Instrument | Aluminum | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount					151.9
Not Designated as Hedging Instrument | Aluminum | Sales
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount					1.8
Not Designated as Hedging Instrument | Midwest premium swap contracts | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount					150.1
Not Designated as Hedging Instrument | Natural Gas | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU					3,650,000
Designated as Hedging Instrument | Alloy Metal Hedge | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount					4.6
Designated as Hedging Instrument | Foreign Exchange Contract | Purchase
Derivative [Line Items]
Derivative, Notional Amount | €					€ 301,304
Scenario, Forecast | Natural Gas
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage	39.00%	71.00%	71.00%	72.00%
Scenario, Forecast | Electricity Member
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage	18.00%	55.00%	55.00%	54.00%

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Derivatives, Hedging Programs and Other Financial Instruments, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Summary Of Realized And Unrealized Gains (Losses)
Unrealized loss (gain)			$ (14.0)	$ (16.9)
Cost of Sales | Aluminum | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (gain) loss	$ (4.0)	$ 0.4	(13.8)	4.1
Cost of Sales | Natural Gas | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (gain) loss	0.2	0.9	0.3	4.2
Cost of Sales | Alloy Metal Hedge | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (gain) loss	(0.3)	0.0	(0.2)	0.0
Cost of Sales | Foreign Exchange Contract | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (gain) loss	(0.1)	0.0	(0.1)	0.0
Cost of Sales | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (gain) loss	(4.2)	1.3	(13.8)	8.3
Gain (Loss) on Derivative Instruments | Aluminum | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized loss (gain)	(10.6)	(1.7)	(15.3)	(11.7)
Gain (Loss) on Derivative Instruments | Natural Gas | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized loss (gain)	(0.2)	(0.3)	1.3	(5.2)
Gain (Loss) on Derivative Instruments | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized loss (gain)	$ (10.8)	$ (2.0)	$ (14.0)	$ (16.9)

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Derivatives, Hedging Programs and Other Financial Instruments, Offsetting of Derivative Instruments by Counterparty (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	$ 20.5	$ 5.8
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	20.5	5.8
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.4	1.7
Net Amount	19.1	4.1
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(1.4)	(1.8)
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(1.4)	(1.8)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.4)	(1.7)
Net Amount	0.0	(0.1)
Counterparty (with Netting Agreements)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	20.5	3.3
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	20.5	3.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.4	1.0
Net Amount	19.1	2.3
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(1.4)	(1.0)
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(1.4)	(1.0)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.4)	(1.0)
Net Amount	$ 0.0	0.0
Counterparty (with partial Netting Agreements)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets		2.5
Gross Amounts Offset in the Consolidated Balance Sheets		0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheets		2.5
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments		0.7
Net Amount		1.8
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities		(0.8)
Gross Amounts Offset in the Consolidated Balance Sheets		0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets		(0.8)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments		(0.7)
Net Amount		$ (0.1)

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Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 20.5	$ 5.8
Derivative Liability	(1.4)	(1.8)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	73.9	55.2
Derivative Asset	20.5	5.8
Derivative Liability	(1.4)	(1.8)
Other Assets, Fair Value Disclosure	265.3	286.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	17.3	37.9
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Other Assets, Fair Value Disclosure	17.3	37.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	56.6	17.3
Derivative Asset	20.5	5.8
Derivative Liability	(1.4)	(1.8)
Other Assets, Fair Value Disclosure	248.0	248.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Other Assets, Fair Value Disclosure	0.0	0.0
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	18.4	3.3
Derivative Liability		(1.1)
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability		0.0
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	18.4	3.3
Derivative Liability		(1.1)
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability		0.0
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.8	0.9
Derivative Liability	(0.8)	(0.2)
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.8	0.9
Derivative Liability	(0.8)	(0.2)
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Not Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.4	1.6
Derivative Liability	(0.5)	(0.4)
Not Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Not Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.4	1.6
Derivative Liability	(0.5)	(0.4)
Not Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability	0.0	0.0
Not Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(0.1)
Not Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0.0
Not Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(0.1)
Not Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0.0
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.9
Derivative Liability		(0.1)
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0
Derivative Liability		0.0
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.9
Derivative Liability		(0.1)
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0
Derivative Liability		0.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	191.4	231.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0.0	0.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	191.4	231.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0.0	0.0
Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	15.8	5.0
Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4.7	0.8
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(0.9)	(0.8)
Other Noncurrent Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ (0.5)	$ (1.0)

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Derivatives, Hedging Programs and Other Financial Instruments, Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Debt Instrument, Term		12 months
Derivative Instruments in Hedges, at Fair Value, Net	$ 19,100,000	$ 19,100,000					$ 4,000,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		500,000
Margin Deposit Assets	0	0					$ 0
Customer Deposits, Current	0	0
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	$ 0	$ 0
Scenario, Forecast | Natural Gas Member
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage			39.00%	71.00%	71.00%	72.00%
Scenario, Forecast | Electricity Member
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage			18.00%	55.00%	55.00%	54.00%

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Net Income Per Share and Stockholders' Equity, Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 19.9	$ 14.9	$ 60.6	$ 67.2
Denominator — Weighted-average common shares outstanding (in thousands):
Basic (shares)	16,834	17,841	17,072	17,858
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options (shares)	326	334	291	323
Diluted (shares)	17,160	18,175	17,363	18,181
Net income per common share:
Basic (in dollars per share)	$ 1.18	$ 0.84	$ 3.55	$ 3.76
Earnings per common share, Diluted:
Diluted (in dollars per share)	$ 1.16	$ 0.82	$ 3.49	$ 3.70

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Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	3	3	2
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	3	3	3	2

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Net Income Per Share and Stockholders' Equity, Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Payments of Dividends	$ 26.4	$ 24.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 123.4

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Net Income Per Share and Stockholders' Equity, Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Repurchase of common stock (shares)	806,307	170,304
Treasury Stock Acquired, Average Cost Per Share	$ 80.60	$ 81.04
Treasury Stock, Value, Acquired, Cost Method	$ 64.9	$ 13.8

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Segment and Geographical Area Information by Operating Segment Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Net sales:
Net Sales	$ 332.8	$ 320.6	$ 1,044.4	$ 998.7
Segment operating income (loss):
Operating income (loss)	39.8	29.8	110.7	132.5
Interest expense	(5.3)	(5.5)	(16.4)	(14.7)
Other (expense) income, net	1.5	0.0	3.1	(10.4)
Income before income taxes	36.0	24.3	97.4	107.4
Depreciation and amortization:
Depreciation and amortization	10.2	9.0	29.3	26.7
Capital expenditures:
Capital expenditures	16.4	15.1	56.1	57.4
Assets:
Assets	1,422.7		1,422.7		$ 1,443.5
Fabricated Products
Segment operating income (loss):
Operating income (loss)	53.7	42.1	149.9	172.1
Depreciation and amortization:
Depreciation and amortization	10.1	8.8	28.9	26.2
Capital expenditures:
Capital expenditures	16.3	15.0	55.7	57.1
Assets:
Assets	1,007.9		1,007.9		969.4
All Other
Segment operating income (loss):
Operating income (loss)	(13.9)	(12.3)	(39.2)	(39.6)
Depreciation and amortization:
Depreciation and amortization	0.1	0.2	0.4	0.5
Capital expenditures:
Capital expenditures	0.1	$ 0.1	0.4	$ 0.3
Assets:
Assets	$ 414.8		$ 414.8		$ 474.1

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Segment and Geographical Area Information, Net Sales by End Market Segment Applications (Details) - Fabricated Products - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Sales:
Net sales	$ 332.8	$ 320.6	$ 1,044.4	$ 998.7
Aero/HS products
Net Sales:
Net sales	150.2	156.1	483.2	500.7
Automotive Extrusions
Net Sales:
Net sales	52.7	46.5	161.6	143.6
GE products
Net Sales:
Net sales	115.9	105.6	361.1	318.3
Other products
Net Sales:
Net sales	$ 14.0	$ 12.4	$ 38.5	$ 36.1

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Segment and Geographical Area Information, Income Taxes Paid by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
Income Taxes Paid	$ 0.3	$ 0.1	$ 0.8	$ 0.9
Domestic
Segment Reporting Information
Income Taxes Paid	0.3	0.1	0.7	0.4
Foreign
Segment Reporting Information
Income Taxes Paid	$ 0.0	$ 0.0	$ 0.1	$ 0.5

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Segment and Geographical Area Information, Supply Information (Details) - Supplier Concentration Risk - Aluminum	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Top five major suppliers
Concentration Risk
Concentration Risk, Percentage	86.00%	84.00%	85.00%	84.00%
Largest supplier
Concentration Risk
Concentration Risk, Percentage	35.00%	28.00%	36.00%	32.00%
Second and third largest suppliers
Concentration Risk
Concentration Risk, Percentage	35.00%	33.00%	33.00%	31.00%

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Segment and Geographical Area Information, Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017 productionfacilities	Sep. 30, 2016	Dec. 31, 2016 customer
Segment Reporting Information
Percentage of Employees Covered by Collective Bargaining Agreements	64.00%		64.00%
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year	12.00%		12.00%
Domestic
Segment Reporting Information
Number of production facilities			11
Foreign
Segment Reporting Information
Number of production facilities			1
Customer Concentration Risk | Largest Customer | Sales Revenue, Net | Fabricated Products
Segment Reporting Information
Concentration Risk, Percentage	27.00%	25.00%	28.00%	26.00%
Customer Concentration Risk | Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage			17.00%		18.00%
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | Fabricated Products
Segment Reporting Information
Concentration Risk, Percentage	11.00%	11.00%	10.00%	10.00%
Customer Concentration Risk | Second Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage			16.00%		12.00%
Customer Concentration Risk | Second Largest Customer | Accounts Receivable | Fabricated Products
Segment Reporting Information
Number of Customers | customer					2
Customer Concentration Risk | Second Largest Customer (number 2) | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage					12.00%

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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Supplemental disclosure of cash flow information:
Interest paid	$ 10.0	$ 6.7
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	3.4	2.4
Stock repurchases not yet settled	0.0	0.2
Acquisition of property and equipment through capital leasing arrangements	0.3	0.0
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	73.9	72.9	$ 55.2
Restricted cash included in Prepaid expenses and other current assets	0.3	0.3
Restricted cash included in Other assets	12.9	11.7
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$ 87.1	$ 84.9	$ 67.7	$ 83.7

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Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	May 23, 2012
Other Income and Expenses [Abstract]
Interest income	$ 0.0	$ 0.0	$ 0.0	$ 0.1
Realized gain on investments	0.8	0.1	2.2	0.4
Loss on extinguishment of debt	0.0	0.0	0.0	(11.1)
All other income (expense), net	0.7	(0.1)	0.9	0.2
Other income (expense), net	$ 1.5	$ 0.0	$ 3.1	(10.4)
Senior Notes | Senior Notes Due 2020
Debt Instrument
Debt instrument contractual rate (percent)					8.25%
Redemption premium				8.2
Write off of deferred debt issuance cost				$ 2.9

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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 804.7
Other comprehensive income, net of tax			4.0
Ending balance	$ 783.6		783.6
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(35.4)	$ (29.8)	(37.1)	$ (31.3)
Reclassification from AOCI, Current Period, Tax	(0.5)	(0.4)	(1.6)	(1.2)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	0.9	0.7	2.6	2.1
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(0.1)	0.0	(0.1)	0.1
Other comprehensive income, net of tax	0.8	0.7	2.5	2.2
Ending balance	(34.6)	(29.1)	(34.6)	(29.1)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0.2	0.1	0.6	0.3
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	1.2	1.0	3.6	3.0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1.1	0.2	0.8	(0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent	1.0	0.9	3.1	1.3
Other Comprehensive Income (Loss) before Reclassifications, Tax	(0.4)	(0.4)	(1.2)	(0.5)
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0.6	0.5	1.9	0.8
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(0.5)	(0.3)	(2.1)	(0.3)
Reclassification from AOCI, Current Period, Tax	0.2	0.1	0.8	0.1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(0.3)	(0.2)	(1.3)	(0.2)
Other comprehensive income, net of tax	0.3	0.3	0.6	0.6
Ending balance	1.4	0.5	1.4	0.5
Accumulated Other Comprehensive Loss (Other) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.0	(0.3)	(0.4)	(0.3)
OCI, before Reclassifications, before Tax, Attributable to Parent	1.1	0.1	1.4	0.2
Other Comprehensive Income (Loss) before Reclassifications, Tax	(0.4)	0.0	(0.5)	(0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0.7	0.1	0.9	0.1
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(0.3)	0.0	0.0	0.0
Reclassification from AOCI, Current Period, Tax	0.1	0.0	0.0	0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(0.2)	0.0	0.0	0.0
Other comprehensive income, net of tax	0.5	0.1	0.9	0.1
Ending balance	0.5	(0.2)	0.5	(0.2)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(36.7)
Other comprehensive income, net of tax			4.0
Ending balance	$ (32.7)	$ (28.8)	$ (32.7)	$ (28.8)

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Condensed Guarantor and Non-Guarantor Financial Information, Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 73.9	$ 55.2	$ 72.9
Short-term investments	191.4	231.0
Receivables:
Trade receivables, net	138.2	137.7
Intercompany receivables	0.0	0.0
Other	15.4	11.9
Inventories	212.2	201.6
Prepaid expenses and other current assets	31.5	18.5
Total current assets	662.6	655.9
Investments in and advances to subsidiaries	0.0	0.0
Property, plant and equipment, net	557.8	530.9
Long-term intercompany loans receivable	0.0	0.0
Deferred tax assets, net	118.7	159.7
Intangible assets, net	25.3	26.4
Goodwill	18.8	37.2		$ 37.2
Other assets	39.5	33.4
Total	1,422.7	1,443.5
Current liabilities:
Accounts payable	94.4	75.8
Intercompany loans payable	0.0	0.0
Accrued salaries, wages and related expenses	39.0	49.1
Other accrued liabilities	43.3	40.1
Total current liabilities	176.7	165.0
Net liabilities of Salaried VEBA	27.8	28.6
Deferred tax liabilities	3.3	3.3
Long-term intercompany loans payable	0.0	0.0
Long-term liabilities	61.9	73.2
Long-term debt	369.4	368.7
Total liabilities	639.1	638.8
Total stockholders' equity	783.6	804.7
Total	1,422.7	1,443.5
Consolidating Adjustments
Current assets:
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Receivables:
Trade receivables, net	0.0	0.0
Intercompany receivables	(56.3)	(86.5)
Other	0.0	0.0
Inventories	(4.9)	(3.9)
Prepaid expenses and other current assets	0.0	(0.5)
Total current assets	(61.2)	(90.9)
Investments in and advances to subsidiaries	(1,148.9)	(1,052.5)
Property, plant and equipment, net	0.0	0.0
Long-term intercompany loans receivable	(10.5)	(85.1)
Deferred tax assets, net	4.8	4.8
Intangible assets, net	0.0	0.0
Goodwill	0.0	0.0
Other assets	0.0	0.0
Total	(1,215.8)	(1,223.7)
Current liabilities:
Accounts payable	0.0	0.0
Intercompany loans payable	(56.3)	(86.5)
Accrued salaries, wages and related expenses	0.0	0.0
Other accrued liabilities	(7.1)	(14.7)
Total current liabilities	(63.4)	(101.2)
Net liabilities of Salaried VEBA	0.0	0.0
Deferred tax liabilities	0.0	0.0
Long-term intercompany loans payable	(10.5)	(85.1)
Long-term liabilities	0.0	0.0
Long-term debt	0.0	0.0
Total liabilities	(73.9)	(186.3)
Total stockholders' equity	(1,141.9)	(1,037.4)
Total	(1,215.8)	(1,223.7)
Parent
Current assets:
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Receivables:
Trade receivables, net	0.0	0.0
Intercompany receivables	55.6	85.8
Other	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.1	0.1
Total current assets	55.7	85.9
Investments in and advances to subsidiaries	1,107.0	1,012.4
Property, plant and equipment, net	0.0	0.0
Long-term intercompany loans receivable	0.0	80.2
Deferred tax assets, net	0.0	0.0
Intangible assets, net	0.0	0.0
Goodwill	0.0	0.0
Other assets	0.0	0.0
Total	1,162.7	1,178.5
Current liabilities:
Accounts payable	1.4	2.2
Intercompany loans payable	0.0	0.0
Accrued salaries, wages and related expenses	0.0	0.0
Other accrued liabilities	8.3	2.9
Total current liabilities	9.7	5.1
Net liabilities of Salaried VEBA	0.0	0.0
Deferred tax liabilities	0.0	0.0
Long-term intercompany loans payable	0.0	0.0
Long-term liabilities	0.0	0.0
Long-term debt	369.4	368.7
Total liabilities	379.1	373.8
Total stockholders' equity	783.6	804.7
Total	1,162.7	1,178.5
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	70.7	52.9
Short-term investments	191.4	231.0
Receivables:
Trade receivables, net	133.1	133.1
Intercompany receivables	0.1	0.1
Other	14.6	11.4
Inventories	208.5	197.5
Prepaid expenses and other current assets	31.0	18.0
Total current assets	649.4	644.0
Investments in and advances to subsidiaries	41.9	40.1
Property, plant and equipment, net	527.6	499.5
Long-term intercompany loans receivable	0.0	0.0
Deferred tax assets, net	113.9	154.9
Intangible assets, net	25.3	26.4
Goodwill	18.8	37.2
Other assets	39.5	33.4
Total	1,416.4	1,435.5
Current liabilities:
Accounts payable	86.8	68.9
Intercompany loans payable	56.2	86.4
Accrued salaries, wages and related expenses	37.2	47.2
Other accrued liabilities	41.0	52.6
Total current liabilities	221.2	255.1
Net liabilities of Salaried VEBA	27.8	28.6
Deferred tax liabilities	0.0	0.0
Long-term intercompany loans payable	10.5	85.1
Long-term liabilities	59.3	70.5
Long-term debt	0.0	0.0
Total liabilities	318.8	439.3
Total stockholders' equity	1,097.6	996.2
Total	1,416.4	1,435.5
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	3.2	2.3
Short-term investments	0.0	0.0
Receivables:
Trade receivables, net	5.1	4.6
Intercompany receivables	0.6	0.6
Other	0.8	0.5
Inventories	8.6	8.0
Prepaid expenses and other current assets	0.4	0.9
Total current assets	18.7	16.9
Investments in and advances to subsidiaries	0.0	0.0
Property, plant and equipment, net	30.2	31.4
Long-term intercompany loans receivable	10.5	4.9
Deferred tax assets, net	0.0	0.0
Intangible assets, net	0.0	0.0
Goodwill	0.0	0.0
Other assets	0.0	0.0
Total	59.4	53.2
Current liabilities:
Accounts payable	6.2	4.7
Intercompany loans payable	0.1	0.1
Accrued salaries, wages and related expenses	1.8	1.9
Other accrued liabilities	1.1	(0.7)
Total current liabilities	9.2	6.0
Net liabilities of Salaried VEBA	0.0	0.0
Deferred tax liabilities	3.3	3.3
Long-term intercompany loans payable	0.0	0.0
Long-term liabilities	2.6	2.7
Long-term debt	0.0	0.0
Total liabilities	15.1	12.0
Total stockholders' equity	44.3	41.2
Total	$ 59.4	$ 53.2

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Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 332.8	$ 320.6		$ 1,044.4	$ 998.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	267.2	254.7		822.7	767.1
Lower of cost or market inventory write-down	0.0	0.0	$ 4.9	0.0	4.9
Unrealized gain on derivative instruments	(10.8)	(2.0)		(14.0)	(16.9)
Depreciation and amortization	10.2	9.0		29.3	26.7
Selling, general, administrative, research and development	24.7	25.6		74.7	79.2
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2	0.8		3.4	2.5
Gain on removal of Union VEBA net assets	0.5	0.0		(0.8)	(0.1)
Total selling, general, administrative, research and development	26.4	26.4		77.3	81.6
Goodwill impairment	0.0	0.0		18.4	0.0
Other operating charges, net	0.0	2.7		0.0	2.8
Total costs and expenses	293.0	290.8		933.7	866.2
Operating income	39.8	29.8		110.7	132.5
Other (expense) income:
Interest (expense) income	(5.3)	(5.5)		(16.4)	(14.7)
Other (expense) income, net	1.5	0.0		3.1	(10.4)
Income before income taxes	36.0	24.3		97.4	107.4
Income tax provision	(16.1)	(9.4)		(36.8)	(40.2)
Earnings in equity of subsidiaries	0.0	0.0		0.0	0.0
Net income	19.9	14.9		60.6	67.2
Comprehensive income	21.5	16.0		64.6	70.1
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(19.4)	(19.9)		(60.7)	(58.8)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(18.4)	(19.0)		(58.1)	(56.3)
Lower of cost or market inventory write-down					0.0
Unrealized gain on derivative instruments	0.0	0.0		0.0	0.0
Depreciation and amortization	0.0	0.0		0.0	0.0
Selling, general, administrative, research and development	(0.6)	(0.6)		(1.6)	(2.0)
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0		0.0	0.0
Gain on removal of Union VEBA net assets	0.0			0.0	0.0
Total selling, general, administrative, research and development	(0.6)	(0.6)		(1.6)	(2.0)
Goodwill impairment				0.0
Other operating charges, net		0.0			0.0
Total costs and expenses	(19.0)	(19.6)		(59.7)	(58.3)
Operating income	(0.4)	(0.3)		(1.0)	(0.5)
Other (expense) income:
Interest (expense) income	0.1	0.1		0.1	0.1
Other (expense) income, net	(0.1)	(0.1)		(0.1)	(0.1)
Income before income taxes	(0.4)	(0.3)		(1.0)	(0.5)
Income tax provision	2.3	2.5		7.1	11.6
Earnings in equity of subsidiaries	(26.5)	(22.3)		(81.1)	(98.8)
Net income	(24.6)	(20.1)		(75.0)	(87.7)
Comprehensive income	(26.2)	(21.2)		(79.0)	(90.6)
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0.0	0.0		0.0	0.0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	0.0	0.0		0.0	0.0
Lower of cost or market inventory write-down					0.0
Unrealized gain on derivative instruments	0.0	0.0		0.0	0.0
Depreciation and amortization	0.0	0.0		0.0	0.0
Selling, general, administrative, research and development	1.0	0.9		3.4	3.3
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0		0.0	0.0
Gain on removal of Union VEBA net assets	0.0			0.0	0.0
Total selling, general, administrative, research and development	1.0	0.9		3.4	3.3
Goodwill impairment				0.0
Other operating charges, net		0.0			0.0
Total costs and expenses	1.0	0.9		3.4	3.3
Operating income	(1.0)	(0.9)		(3.4)	(3.3)
Other (expense) income:
Interest (expense) income	(5.0)	(5.7)		(15.3)	(15.9)
Other (expense) income, net	0.0	(0.1)		0.0	(11.1)
Income before income taxes	(6.0)	(6.7)		(18.7)	(30.3)
Income tax provision	0.0	0.0		0.0	0.0
Earnings in equity of subsidiaries	25.9	21.6		79.3	97.5
Net income	19.9	14.9		60.6	67.2
Comprehensive income	21.5	16.0		64.6	70.1
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	325.9	313.9		1,019.7	976.9
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	261.6	250.0		805.8	753.1
Lower of cost or market inventory write-down					4.9
Unrealized gain on derivative instruments	(10.8)	(2.0)		(14.0)	(16.9)
Depreciation and amortization	9.7	8.5		27.7	25.2
Selling, general, administrative, research and development	23.5	24.0		67.2	71.4
Net periodic postretirement benefit cost relating to Salaried VEBA	1.2	0.8		3.4	2.5
Gain on removal of Union VEBA net assets	0.5			(0.8)	(0.1)
Total selling, general, administrative, research and development	25.2	24.8		69.8	73.8
Goodwill impairment				18.4
Other operating charges, net		2.7			2.8
Total costs and expenses	285.7	284.0		907.7	842.9
Operating income	40.2	29.9		112.0	134.0
Other (expense) income:
Interest (expense) income	(0.4)	0.1		(1.2)	1.1
Other (expense) income, net	1.3	0.1		2.7	0.6
Income before income taxes	41.1	30.1		113.5	135.7
Income tax provision	(18.0)	(11.6)		(43.0)	(51.1)
Earnings in equity of subsidiaries	0.6	0.7		1.8	1.3
Net income	23.7	19.2		72.3	85.9
Comprehensive income	25.3	20.3		76.3	88.7
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	26.3	26.6		85.4	80.6
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	24.0	23.7		75.0	70.3
Lower of cost or market inventory write-down					0.0
Unrealized gain on derivative instruments	0.0	0.0		0.0	0.0
Depreciation and amortization	0.5	0.5		1.6	1.5
Selling, general, administrative, research and development	0.8	1.3		5.7	6.5
Net periodic postretirement benefit cost relating to Salaried VEBA	0.0	0.0		0.0	0.0
Gain on removal of Union VEBA net assets	0.0			0.0	0.0
Total selling, general, administrative, research and development	0.8	1.3		5.7	6.5
Goodwill impairment				0.0
Other operating charges, net		0.0			0.0
Total costs and expenses	25.3	25.5		82.3	78.3
Operating income	1.0	1.1		3.1	2.3
Other (expense) income:
Interest (expense) income	0.0	0.0		0.0	0.0
Other (expense) income, net	0.3	0.1		0.5	0.2
Income before income taxes	1.3	1.2		3.6	2.5
Income tax provision	(0.4)	(0.3)		(0.9)	(0.7)
Earnings in equity of subsidiaries	0.0	0.0		0.0	0.0
Net income	0.9	0.9		2.7	1.8
Comprehensive income	$ 0.9	$ 0.9		$ 2.7	$ 1.9

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Condensed Guarantor and Non-Guarantor Financial Information, Cash Flow Statements (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net cash (used in) provided by operating activities				$ 131.5	$ 107.4
Cash flows from investing activities
Capital expenditures		$ (16.4)	$ (15.1)	(56.1)	(57.4)
Purchase of available for sale securities				(196.0)	(201.1)
Proceeds from disposition of available for sale securities				237.2	30.0
Proceeds from disposal of property, plant and equipment				0.6	0.0
Intercompany loans receivable				0.0	0.0
Net cash used in investing activities	[1]			(14.3)	(228.5)
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes				0.0	(206.0)
Issuance of 5.875% Senior Notes				0.0	375.0
Cash paid for debt issuance costs				0.0	(6.8)
Proceeds from stock option exercises				0.0	1.0
Repayment of capital lease				(0.2)	(0.1)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares				(4.5)	(2.8)
Repurchase of common stock				(66.7)	(13.6)
Cash dividends and dividend equivalents paid				(26.4)	(24.4)
Cash dividends paid to Parent					0.0
Intercompany loans payable				0.0	0.0
Net cash (used in) provided by financing activities	[1]			(97.8)	122.3
Net increase in cash, cash equivalents and restricted cash during the period				19.4	1.2
Cash, cash equivalents and restricted cash at beginning of period				67.7	83.7
Cash, cash equivalents and restricted cash at end of period		87.1	84.9	87.1	84.9
Consolidating Adjustments
Cash flows from operating activities:
Net cash (used in) provided by operating activities				0.0	(200.0)
Cash flows from investing activities
Capital expenditures				0.0	0.0
Purchase of available for sale securities				0.0	0.0
Proceeds from disposition of available for sale securities				0.0	0.0
Proceeds from disposal of property, plant and equipment				0.0
Intercompany loans receivable				(104.8)	103.3
Net cash used in investing activities				(104.8)	103.3
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes					0.0
Issuance of 5.875% Senior Notes					0.0
Cash paid for debt issuance costs					0.0
Proceeds from stock option exercises					0.0
Repayment of capital lease				0.0	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 and dividend equivalents paid				0.0	0.0
Cash dividends paid to Parent					200.0
Intercompany loans payable				104.8	(103.3)
Net cash (used in) provided by financing activities				104.8	96.7
Net increase in cash, cash equivalents and restricted cash during the period				0.0	0.0
Cash, cash equivalents and restricted cash at beginning of period				0.0	0.0
Cash, cash equivalents and restricted cash at end of period		0.0	0.0	0.0	0.0
Parent
Cash flows from operating activities:
Net cash (used in) provided by operating activities				(12.8)	189.7
Cash flows from investing activities
Capital expenditures				0.0	0.0
Purchase of available for sale securities				0.0	0.0
Proceeds from disposition of available for sale securities				0.0	0.0
Proceeds from disposal of property, plant and equipment				0.0
Intercompany loans receivable				110.4	(205.6)
Net cash used in investing activities				110.4	(205.6)
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes					(206.0)
Issuance of 5.875% Senior Notes					375.0
Cash paid for debt issuance costs					(6.8)
Proceeds from stock option exercises					1.0
Repayment of capital lease				0.0	0.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares				(4.5)	(2.8)
Repurchase of common stock				(66.7)	(13.6)
Cash dividends and dividend equivalents paid				(26.4)	(24.4)
Cash dividends paid to Parent					0.0
Intercompany loans payable				0.0	(106.5)
Net cash (used in) provided by financing activities				(97.6)	15.9
Net increase in cash, cash equivalents and restricted cash during the period				0.0	0.0
Cash, cash equivalents and restricted cash at beginning of period				0.0	0.0
Cash, cash equivalents and restricted cash at end of period		0.0	0.0	0.0	0.0
Guarantor Subsidiaries
Cash flows from operating activities:
Net cash (used in) provided by operating activities				137.4	109.3
Cash flows from investing activities
Capital expenditures				(55.7)	(55.6)
Purchase of available for sale securities				(196.0)	(201.1)
Proceeds from disposition of available for sale securities				237.2	30.0
Proceeds from disposal of property, plant and equipment				0.6
Intercompany loans receivable				0.0	106.0
Net cash used in investing activities				(13.9)	(120.7)
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes					0.0
Issuance of 5.875% Senior Notes					0.0
Cash paid for debt issuance costs					0.0
Proceeds from stock option exercises					0.0
Repayment of capital lease				(0.2)	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 and dividend equivalents paid				0.0	0.0
Cash dividends paid to Parent					(200.0)
Intercompany loans payable				(104.8)	209.3
Net cash (used in) provided by financing activities				(105.0)	9.3
Net increase in cash, cash equivalents and restricted cash during the period				18.5	(2.1)
Cash, cash equivalents and restricted cash at beginning of period				65.1	83.0
Cash, cash equivalents and restricted cash at end of period		83.6	80.9	83.6	80.9
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash (used in) provided by operating activities				6.9	8.4
Cash flows from investing activities
Capital expenditures				(0.4)	(1.8)
Purchase of available for sale securities				0.0	0.0
Proceeds from disposition of available for sale securities				0.0	0.0
Proceeds from disposal of property, plant and equipment				0.0
Intercompany loans receivable				(5.6)	(3.7)
Net cash used in investing activities				(6.0)	(5.5)
Cash flows from financing activities
Repayment of principal and redemption premium of 8.25% Senior Notes					0.0
Issuance of 5.875% Senior Notes					0.0
Cash paid for debt issuance costs					0.0
Proceeds from stock option exercises					0.0
Repayment of capital lease				0.0	(0.1)
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 and dividend equivalents paid				0.0	0.0
Cash dividends paid to Parent					0.0
Intercompany loans payable				0.0	0.5
Net cash (used in) provided by financing activities				0.0	0.4
Net increase in cash, cash equivalents and restricted cash during the period				0.9	3.3
Cash, cash equivalents and restricted cash at beginning of period				2.6	0.7
Cash, cash equivalents and restricted cash at end of period		$ 3.5	$ 4.0	$ 3.5	$ 4.0

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

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Condensed Guarantor and Non-Guarantor Financial Information, Narrative (Details) - USD ($)	Sep. 30, 2017	May 15, 2016	May 23, 2012
Condensed Financial Statements, Captions
Ownership interest by parent	100.00%
Senior Notes Due 2020 | Senior Notes
Condensed Financial Statements, Captions
Debt Instrument, Face Amount			$ 225,000,000
Debt instrument contractual rate (percent)			8.25%
Senior Notes Due 2024 | Senior Notes
Condensed Financial Statements, Captions
Debt Instrument, Face Amount		$ 375,000,000
Debt instrument contractual rate (percent)		5.875%

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Oct. 12, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Cash dividends declared (in dollars per share)		$ 0.50	$ 0.45	$ 1.50	$ 1.35
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared (in dollars per share)	$ 0.5
Cash dividends declared	$ 8.5