Kaiser Aluminum (KALU) 10-Q 21 Apr 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 17, 2017
Document Information [Line Items]
Entity Registrant Name	Kaiser Aluminum Corp
Entity Central Index Key	811,596
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		17,195,093

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 34.4	$ 55.2
Short-term investments	195.5	231
Receivables:
Trade receivables – net	157	137.7
Other	11.8	11.9
Inventories	203.5	201.6
Prepaid expenses and other current assets	34	18.5
Total current assets	636.2	655.9
Property, plant and equipment – net	535.8	530.9
Deferred tax assets – net	140.8	159.7
Intangible assets – net	26	26.4
Goodwill	37.2	37.2
Other assets	37.1	33.4
Total	1,413.1	1,443.5
Current liabilities:
Accounts payable	84.4	75.8
Accrued salaries, wages and related expenses	29.1	49.1
Other accrued liabilities	40.4	40.1
Total current liabilities	153.9	165
Net liabilities of Salaried VEBA	28.3	28.6
Deferred tax liabilities	3.3	3.3
Long-term liabilities	60.1	73.2
Long-term debt	368.9	368.7
Total liabilities	614.5	638.8
Commitments and contingencies
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both March 31, 2017 and December 31, 2016; no shares were issued and outstanding at March 31, 2017 and December 31, 2016	0	0
Common stock, par value $0.01, 90,000,000 shares authorized at both March 31, 2017 and at December 31, 2016; 22,379,247 shares issued and 17,282,630 shares outstanding at March 31, 2017; 22,332,732 shares issued and 17,651,461 shares outstanding at December 31, 2016	0.2	0.2
Additional paid in capital	1,046	1,047.4
Retained earnings	101.9	75.2
Treasury stock, at cost, 5,096,617 shares at March 31, 2017 and 4,681,271 shares at December 31, 2016, respectively	(314.1)	(281.4)
Accumulated other comprehensive loss	(35.4)	(36.7)
Total stockholders' equity	798.6	804.7
Total	$ 1,413.1	$ 1,443.5

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 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	22,379,247	22,332,732
Common stock, shares outstanding	17,282,630	17,651,461
Treasury stock, shares	5,096,617	4,681,271

Statements of Consolidated Inco

Statements of Consolidated Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 355.3	$ 343.2
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	277.8	262
Lower of cost or market inventory write-down	0	4.9
Unrealized gain on derivative instruments	(15.1)	(4)
Depreciation and amortization	9.6	8.7
Selling, general, administrative, research and development	23.7	26.1
Net periodic postretirement benefit cost relating to Salaried VEBA	1.1	0.8
Gain on removal of Union VEBA net assets – Note 5	(1.3)	(0.1)
Total selling, general, administrative, research and development	23.5	26.8
Total costs and expenses	295.8	298.4
Operating income	59.5	44.8
Other (expense) income:
Interest expense	(5.6)	(3.7)
Other income, net	0.6	0.3
Income before income taxes	54.5	41.4
Income tax provision	(18.5)	(15.1)
Net income	$ 36	$ 26.3
Net income per common share:
Basic (in dollars per share)	$ 2.07	$ 1.47
Diluted (in dollars per share)	$ 2.04	$ 1.44
Weighted-average number of common shares outstanding (in thousands):
Basic (shares)	17,385	17,864
Diluted (shares)	17,603	18,200
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.45

Statements of Consolidated Comp

Statements of Consolidated Comprehensive Income Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 36	$ 26.3
Other Comprehensive Income (Loss), Net of Tax - Note 13:
Defined benefit pension plan and VEBAs	0.9	0.8
Available for sale securities	0.1	0
Other comprehensive income, net of tax	1.3	0.9
Comprehensive income	37.3	27.2
Foreign Exchange Contract [Member]
Other Comprehensive Income (Loss), Net of Tax - Note 13:
Foreign currency and alloy hedges	0.1	0.1
Alloy Metal Hedge [Member]
Other Comprehensive Income (Loss), Net of Tax - Note 13:
Foreign currency and alloy hedges	$ 0.2	$ 0

Statement of Consolidated Stock

Statement of Consolidated Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Stockholders' Equity [Roll Forward]
Net income	$ 26.3
Repurchase of common stock, shares	(83,265)
Repurchase of common stock	$ (6.4)
Ending balance at Mar. 31, 2016						$ (30.8)
Beginning balance, shares (Scenario, Previously Reported) at Dec. 31, 2016		17,651,461
Beginning balance, shares at Dec. 31, 2016	17,651,461
Beginning balance (Scenario, Previously Reported) at Dec. 31, 2016	$ 804.7	$ 0.2	$ 1,047.4	$ 75.2	$ (281.4)	(36.7)
Beginning balance at Dec. 31, 2016	804.7
Stockholders' Equity [Roll Forward]
Net income	36			36
Other comprehensive income, net of tax	1.3					1.3
Issuance of common shares to employees upon option exercises and vesting of restricted stock units and performance shares, shares		102,403
Issuance of common shares to employees upon vesting of restricted stock units and performance shares			0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(55,888)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	$ (4.4)		(4.4)
Repurchase of common stock, shares	(415,346)	(415,346)
Repurchase of common stock	$ (32.7)				(32.7)
Dividends, Cash	9.3			9.3
Amortization of unearned equity compensation	$ 3		3
Ending balance, shares at Mar. 31, 2017	17,282,630	17,282,630
Ending balance at Mar. 31, 2017	$ 798.6	$ 0.2	$ 1,046	$ 101.9	$ (314.1)	$ (35.4)

Statement of Consolidated Cash

Statement of Consolidated Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income		$ 36	$ 26.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment		9.2	8.3
Amortization of definite-lived intangible assets		0.4	0.4
Amortization of debt discount and debt issuance costs		0.3	0.3
Deferred income taxes		18.1	15.1
Non-cash equity compensation		3	2.6
Lower of cost or market inventory write-down		0	4.9
Gain (Loss) on Sale of Investments		(0.7)	0
Non-cash unrealized gains on derivative instruments		(15.1)	(4)
Non-cash net periodic postretirement benefit cost relating to Salaried VEBA		1.1	0.8
Other non-cash changes in assets and liabilities		(1.2)	0.3
Changes in operating assets and liabilities:
Trade and other receivables		(19.2)	(24.6)
Inventories, excluding lower of cost or market write-down		(1.9)	4.1
Prepaid expenses and other current assets		(3.3)	(2.2)
Accounts payable		9.4	1.9
Accrued liabilities		(11.4)	21.2
Annual variable cash contributions to VEBAs		(20)	(19.5)
Long-term assets and liabilities, net		(0.6)	(14.6)
Net cash provided by operating activities		4.1	21.3
Cash flows from investing activities
Capital expenditures		(14.8)	(25.9)
Purchase of available for sale securities		(74.7)	0
Proceeds from disposition of available for sale securities		110.9	20
Net cash provided by (used in) investing activities	[1]	21.4	(5.9)
Cash flows from financing activities
Repayment of capital lease		(0.2)	0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(4.4)	(2.7)
Repurchase of common stock		(32.6)	(6.3)
Payments of Dividends		9.3	8.2
Net cash used in financing activities	[1]	(46.5)	(17.2)
Net decrease in cash, cash equivalents and restricted cash during the period		(21)	(1.8)
Cash, cash equivalents and restricted cash at beginning of period		67.7	83.7
Cash, cash equivalents and restricted cash at end of period		$ 46.7	$ 81.9
[1]	See Note 11 for the supplemental disclosure on non-cash transactions.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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 10 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 during the remainder of 2016 or the first quarter of 2017. Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At March 31, 2017 , the current cost of inventory exceeded its stated LIFO value by $1.9 million . At December 31, 2016 (after inventory write-down adjustments) 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 March 31, 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 $0.5 million and $0.9 million during the quarters ended March 31, 2017 and March 31, 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 $26.8 million at both March 31, 2017 and December 31, 2016 . However, we account for our workers' compensation accrued liability on a discounted basis, using a discount rate of 2.00% at both March 31, 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 $3.8 million and $3.6 million for the periods ended March 31, 2017 and December 31, 2016 , respectively. Derivative Financial Instruments. Hedging transactions using derivative financial instruments are primarily designed to mitigate our exposure to changes in the market price of aluminum, alloying metals and energy and, to a lesser extent, to mitigate our exposure to changes in foreign currency exchange rates. From time to time, we also enter into hedging arrangements in connection with financing transactions to mitigate financial risks. We do not utilize derivative financial instruments for trading or other speculative purposes. Our derivative activities are initiated within guidelines established by management and approved by our Board of Directors. 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 recognize derivative instruments as assets or liabilities in our Consolidated Balance Sheets and measure these instruments at fair value by "marking-to-market" all of our hedging positions at each period's end (see Note 8 ). Because we do not meet the documentation requirements for hedge (deferral) accounting related to aluminum and energy derivatives, unrealized and realized gains and losses associated with these hedges are reflected as a reduction or increase, respectively, in: (i) Unrealized gain on derivative instruments and (ii) 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. These derivative instruments are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. Both realized and unrealized periodic gains and losses of derivative instruments designated as cash flow hedges are deferred in Accumulated other comprehensive loss until depreciation on the underlying equipment commences. Upon commencement, realized gains and losses are recorded in Net income as an adjustment to depreciation expense in the period in which depreciation is recognized on the underlying equipment. Additionally, to limit our economic (i.e. cash exposure) to future price increases of alloying metals, such as zinc and/or copper, used as raw materials in our fabrication operations, we enter into forward swap contracts ("Alloy Hedges"). These Alloy Hedges are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. 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, excluding depreciation and amortization and other items. Depending on the time to maturity and asset or liability position, the carrying values of cash flow hedges are included in Prepaid expenses and other current assets, Other assets, Other accrued liabilities or Long-term liabilities. We report the effective portion of our cash flow hedges in the same financial statement line item as changes in the fair value of the hedged item. 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 as required by GAAP include our derivative instruments and available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 5 ). Additionally, we measure at fair value once each year at December 31 the plan assets of the Salaried VEBA (defined in Note 5 ) and our Canadian defined benefit pension plan. We record our remaining financial assets and liabilities at carrying value. The majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur (or at least annually for goodwill), an evaluation of the affected non-financial asset or liability is required, potentially resulting in an adjustment to the carrying amount of such asset or liability. As of March 31, 2017 , following a qualitative review of operations at the Chandler, Arizona (Extrusion) facility, we determined that no adjustment to the carrying value of its goodwill or intangible asset was required. However, if the facility is unable to reduce its costs and/or increase sales volumes in the near term, it is reasonably possible that the carrying values of its related assets, including goodwill, could be reduced within the next 12 months . 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 ended March 31, 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 expect to adopt ASU 2014-09, including its subsequent amendments discussed above, using the modified retrospective transition approach for the fiscal year ending December 31, 2018. Based on our initial assessment, we have concluded that revenue from certain contracts will continue to be recognized at a point-in-time, while revenue from other contracts, primarily from our Aero/HS products and Automotive Extrusions, will be required to be recognized over time. We are currently assessing the impact that over-time recognition will have on our consolidated financial statements. 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. 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 ; and (iii) ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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.

Supplemental Balance Sheet Info

Supplemental Balance Sheet Information	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Balance Sheet Information	Supplemental Balance Sheet Information March 31, 2017 December 31, 2016 (In millions of dollars) Cash and Cash Equivalents Cash and money market funds $ 23.5 $ 37.9 Commercial paper 10.9 17.3 Total $ 34.4 $ 55.2 Trade Receivables – Net Billed trade receivables $ 157.6 $ 138.2 Unbilled trade receivables 0.5 0.3 Trade receivables, gross 158.1 138.5 Allowance for doubtful receivables (1.1 ) (0.8 ) Trade receivables – net $ 157.0 $ 137.7 Inventories Finished products $ 68.4 $ 73.8 Work-in-process 75.3 71.7 Raw materials 54.7 51.1 Operating supplies 5.1 5.0 Total $ 203.5 $ 201.6 Property, Plant and Equipment – Net Land and improvements $ 22.7 $ 22.7 Buildings and leasehold improvements 89.0 88.6 Machinery and equipment 620.8 615.1 Construction in progress 42.3 34.8 Property, plant and equipment – gross 774.8 761.2 Accumulated depreciation (239.3 ) (230.6 ) Assets held for sale 0.3 0.3 Property, plant and equipment – net $ 535.8 $ 530.9 March 31, 2017 December 31, 2016 (In millions of dollars) Other Accrued Liabilities Uncleared cash disbursements $ 4.6 $ 5.8 Accrued income taxes and taxes payable 9.5 4.3 Accrued annual contribution to VEBAs 11.5 20.0 Accrued interest 8.4 2.9 Other 6.4 7.1 Total $ 40.4 $ 40.1 Long-Term Liabilities Workers' compensation accruals $ 24.5 $ 25.0 Long-term environmental accrual – Note 7 15.8 15.8 Long-term portion of contingent contribution to Union VEBA – Note 5 — 12.8 Other long-term liabilities 19.8 19.6 Total $ 60.1 $ 73.2

Debt and Credit Facility

Debt and Credit Facility	3 Months Ended
	Mar. 31, 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 March 31, 2017 was $6.1 million . Interest expense, including amortization of debt issuance costs, relating to the 5.875% Senior Notes was $5.7 million for the quarter ended March 31, 2017 . 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 $390.0 million and $390.8 million at March 31, 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 $4.3 million for the quarter ended March 31, 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 $293.9 million of borrowing availability under the Revolving Credit Facility at March 31, 2017 , based on the borrowing base determination then in effect. At March 31, 2017 , there were no borrowings under the Revolving Credit Facility and $7.7 million was being used to support outstanding letters of credit, leaving $286.2 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.25% at March 31, 2017 .

Income Tax Matters

Income Tax Matters	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Matters	Income Tax Matters The provision for in comes taxes for each period presented consisted of the following (in millions of dollars): Quarter Ended March 31, 2017 2016 Domestic $ 18.3 $ 14.9 Foreign 0.2 0.2 Total $ 18.5 $ 15.1 The income tax provision for the quarters ended March 31, 2017 and March 31, 2016 was $18.5 million and $15.1 million , reflecting an effective tax rate of 34.0% and 36.5% , respectively. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2017 was due to: (i) a decrease of $1.6 million for the recognition of excess tax benefits from stock-based compensation, resulting in a 2.9% decrease to the blended statutory tax rate and (ii) a decrease of $0.4 million to the valuation allowance for certain state net operating losses, resulting in a 0.8% decrease to the blended statutory tax rate. The difference between the effective tax rate and the projected blended statutory tax rate for the quarter ended March 31, 2016 was due to: (i) a decrease of $0.7 million for the recognition of excess tax benefits from stock-based compensation, resulting in a 1.7% decrease to the blended statutory tax rate, which was partially offset by (ii) an increase of $0.3 million to the valuation allowance for certain state net operating losses, resulting in a 0.7% increase to the blended statutory tax rate. Our gross unrecognized benefits relating to uncertain tax positions were $1.8 million at both March 31, 2017 and December 31, 2016 , of which, $0.7 million would be recorded through our income tax provision and thus impact the effective tax rate at both March 31, 2017 and December 31, 2016 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 .

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefits	Employee Benefits Pension and Similar Benefit Plans. We provide contributions to: (i) multi-employer pension plans sponsored by the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union AFL-CIO, CLC ("USW"), the International Association of Machinists and certain other unions at certain of our production facilities; (ii) defined contribution 401(k) savings plans for salaried employees and certain hourly employees; (iii) a defined benefit plan for salaried employees at our London, Ontario (Canada) facility; and (iv) a non-qualified, unfunded, unsecured plan of deferred compensation for key employees who would otherwise suffer a loss of benefits under our defined contribution plan. VEBA Postretirement Obligations. Certain eligible retirees participate in a voluntary employees' beneficiary association ("VEBA") that provides healthcare and medical cost reimbursement benefits for eligible retirees represented by certain unions and their surviving 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 , and in the first quarter of 2018, we will make a final cash contribution to the Union VEBA with respect to the nine months ending September 30, 2017. The final contribution amount is variable but cannot exceed $12.8 million . As of March 31, 2017 , $11.5 million was recorded within Other accrued liabilities for this final contribution. 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 and medical 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. Deferred Compensation Program . In addition to the Canadian pension plan and Salaried VEBA, 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 March 31, 2017 and December 31, 2016 was $8.6 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. 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) charges 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 net gains or losses on assets, prior service costs associated with plan amendments and actuarial differences. Net periodic benefit cost related to the Canadian defined benefit plan was not material for the quarters ended March 31, 2017 and March 31, 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 March 31, 2017 2016 Salaried VEBA: Service cost 1 $ — $ — Interest cost 0.7 0.7 Expected return on plan assets (1.0 ) (1.0 ) Amortization of prior service cost 1.2 1.0 Amortization of net actuarial loss 0.2 0.1 Total net periodic postretirement benefit cost relating to Salaried VEBA $ 1.1 $ 0.8 ____________ 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 March 31, 2017 2016 Included within Fabricated Products: Deferred compensation plan $ 0.1 $ — Defined contribution plans 4.1 3.6 Multiemployer pension plans 1.1 1.1 Total Fabricated Products $ 5.3 $ 4.7 Included within All Other: Net periodic postretirement benefit cost relating to Salaried VEBA $ 1.1 $ 0.8 (Gain) loss on removal of Union VEBA net assets (1.3 ) (0.1 ) Deferred compensation plan 0.4 0.1 Defined contribution plans 0.5 0.4 Total All Other $ 0.7 $ 1.2 Total $ 6.0 $ 5.9 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").

Employee Incentive Plans

Employee Incentive Plans	3 Months Ended
	Mar. 31, 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 March 31, 2017 , we had a liability of $5.5 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments relating to the three month performance period of our 2017 STI Plan. Long-Term Incentive Programs ("LTI Programs") General . Prior to May 26, 2016, 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 Amended and Restated 2006 Equity and Performance Incentive Plan ("2006 Plan"). On May 26, 2016, our stockholders approved the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan ("2016 Plan"), which replaced and succeeded in its entirety the 2006 Plan. No grants will be made under the 2006 Plan on or after May 26, 2016, but outstanding awards granted under the 2006 Plan will continue unaffected. Subject to certain adjustments that may be required from time to time to prevent dilution or enlargement of the rights of participants under the 2016 Plan, the number of shares of common stock available for awards is limited to 1,045,000 shares, minus, (i) one share for every one share subject to an award granted under the 2006 Plan between December 31, 2015 and the effective date of the 2016 Plan, plus (ii) any shares of our common stock that become available under the 2016 Plan as a result of forfeiture, cancellation, expiration, or cash settlement of awards. At March 31, 2017 , 768,191 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 March 31, 2017 2016 Non-vested common shares and restricted stock units $ 1.3 $ 1.1 TSR-Based Performance Shares 1.3 1.1 CP-Based Performance Shares 0.4 0.1 EVA-Based Performance Shares — 0.3 Total non-cash compensation expense $ 3.0 $ 2.6 The following table presents the allocation of the charges detailed above, by segment (in millions of dollars): Quarter Ended March 31, 2017 2016 Fabricated Products $ 1.2 $ 0.8 All Other 1.8 1.8 Total non-cash compensation expense $ 3.0 $ 2.6 Unrecognized Gross Compensation Cost Data. The following table presents unrecognized gross compensation cost data by type of award as of March 31, 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 $ 8.7 2.3 TSR-Based Performance Shares $ 8.1 2.0 CP-Based Performance Shares $ 7.6 2.6 EVA-Based Performance Shares $ 1.1 2.9 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 quarter ended March 31, 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 Shares Weighted-Average 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 — $ — Granted 1 — — 62,275 73.14 65,044 97.88 65,044 79.69 32,504 79.69 Vested (36,406 ) 67.63 (8,321 ) 77.04 (94,082 ) 83.18 — — — — Forfeited 1 — — (3,425 ) 82.32 (1,340 ) 97.88 (1,340 ) 79.69 (670 ) 79.69 Canceled 1 — — — — (55,288 ) 83.18 — — — — Outstanding at March 31, 2017 78,252 $ 70.39 112,329 $ 73.56 308,859 $ 95.31 127,382 $ 80.07 31,834 $ 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 March 31, 2017 2016 Restricted stock units $ 73.14 $ 74.49 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 and March 31, 2017 , 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. During the quarter ended March 31, 2017 , no options were granted, exercised, expired or forfeited. Under each of the 2006 Plan and 2016 Plan, participants may elect to have us withhold common shares to satisfy minimum statutory tax withholding obligations arising in connection with the exercise of stock options and vesting of non-vested shares, restricted stock units and performance shares. We cancel any such shares withheld on the applicable vesting dates or earlier dates when service requirements are satisfied, which correspond to the times at which income to the employee is recognized. When we withhold these common shares, we are required to remit to the appropriate taxing authorities the fair value of the shares withheld as of the vesting date. During the quarters ended March 31, 2017 and March 31, 2016 , 55,888 and 35,162 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.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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 8 ). 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. In 2012, we submitted a final feasibility study to the Washington State Department of Ecology ("Washington State Ecology") that included recommendations for remediation alternatives primarily to address the historical use of oils containing polychlorinated biphenyls ("PCBs") at our Spokane, Washington ("Trentwood") facility. We also signed an amended work order in 2012 with Washington State Ecology allowing certain remediation activities to begin, including the initiation of a treatability study in regards to proposed PCB remediation methods. We began implementation of certain approved sections of the work plan in 2013 and throughout 2014, completing a number of these sections in 2014 and receiving approval from Washington State Ecology on completed sections. In cooperation with Washington State Ecology, in 2015 we constructed a pilot test facility to determine the treatability and evaluate the feasibility of removing PCBs from ground water under the Trentwood facility. We initiated and began operating the treatment 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 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 March 31, 2017 , our environmental accrual of $17.1 million represented our estimate of the incremental remediation cost based on: (i) proposed alternatives in the final feasibility study related to the Trentwood facility; (ii) currently available facts with respect to our Newark facility; and (iii) facts related to certain other locations owned or formerly owned by us. In accordance with approved and proposed remediation action plans, we expect that the implementation and ongoing monitoring could occur over a period of 30 or more years. As additional facts are developed, feasibility studies are completed, draft remediation plans are modified, necessary regulatory approvals for the implementation of remediation are obtained, alternative technologies are developed, and/or other factors change, there may be revisions to management's estimates and actual costs may exceed the current environmental accruals. We believe at this time that it is reasonably possible that undiscounted costs associated with these environmental matters may exceed current accruals by amounts that could be, in the aggregate, up to an estimated $12.3 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.

Derivatives, Hedging Programs a

Derivatives, Hedging Programs and Other Financial Instruments	3 Months Ended
	Mar. 31, 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 economic (i.e. cash) exposure resulting from: (i) metal price risk related to our sale of fabricated aluminum products and the purchase of metal used as raw material for our fabrication operations; (ii) energy price risk relating to fluctuating prices of natural gas and electricity used in our production processes; and (iii) foreign currency requirements with respect to our foreign subsidiaries and cash commitments for equipment purchases denominated in foreign currency. Our derivative activities are overseen by a hedging committee ("Hedging Committee"), which is composed of our chief executive officer, chief operating officer, chief financial officer, chief accounting officer, treasurer and other officers and employees selected by the chief executive officer. The Hedging Committee meets regularly to review derivative positions and strategy and reports to our Board of Directors on the scope of its activities. 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 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 zero and $0.1 million at March 31, 2017 and December 31, 2016 , respectively, 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 March 31, 2017 , we had no cash collateral posted with any of our customers. For more information about concentration risks concerning customers and suppliers, see Note 10 . Notional Amount of Derivative Contracts . The following table summarizes our derivative positions at March 31, 2017 : Aluminum Maturity Period (month/year) Notional Amount of contracts (mmlbs) Purchased put option contracts 7/17 through 12/17 26.8 Fixed price purchase contracts 4/17 through 12/21 205.8 Fixed price sales contracts 4/17 through 6/18 1.4 Midwest premium swap contracts 1 4/17 through 12/21 203.5 Alloying Metals Maturity Period (month/year) Notional Amount of contracts (mmlbs) Fixed price purchase contracts 4/17 through 12/17 5.7 Natural Gas 2 Maturity Period (month/year) Notional Amount of contracts (mmbtu) Fixed price purchase contracts 4/17 through 12/19 4,640,000 Euro Maturity Period (month/year) Notional Amount of contracts (euro) Fixed price purchase contracts 8/17 105,600 ______________________ 1 Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on our purchases of primary aluminum. 2 As of March 31, 2017 , we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 74% , 72% and 61% of the expected natural gas purchases for the remainder of 2017 , 2018 and 2019 respectively. We have physical delivery commitments at firm prices covering approximately 54% of our expected electricity purchases for each of the remainder of 2017 , 2018 and 2019 , respectively. 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 also 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. Designated Foreign Currency Cash Flow Hedges . We are exposed to foreign currency exchange risk related to firm-price agreements for equipment purchases from foreign manufacturers. Such agreements require that we make payments in foreign currency to the vendor over time based on milestone achievements. We use foreign currency forward contracts in order to mitigate the exposure to currency exchange rate fluctuations related to these purchases. The timing and amounts of the forward contract settlements are designed to line up with the timing and amounts of scheduled payments to the foreign equipment manufacturers and are therefore expected to be highly effective hedges. As of March 31, 2017 , we had one remaining open foreign currency forward contract with a weighted average exchange rate of 1.12 euro to US dollar. The effective portion of the fair value on our designated foreign currency cash flow hedges is recorded within Other comprehensive income, net of tax and is reclassified into the Statements of Consolidated Income on the same line item and the same period in which the underlying equipment is depreciated. 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. Because we are unable to pass along fluctuations in the cost of these alloying metals to our customers, we are exposed to metal price risk. Beginning in the fourth quarter of 2016, to limit our economic (i.e., cash) exposure to future price increases of zinc and/or copper, we entered into Alloy Hedges with third-party financial institutions. Under these Alloy Hedges, we are able to purchase the required alloying metals at predetermined/fixed prices at stated delivery dates. Our Alloy Hedges settle monthly and correspond to forecasted purchases of alloying metals by our manufacturing facilities and are therefore expected to be highly effective hedges. 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 13 ). As of March 31, 2017 , we estimate the net gain of $0.1 million will be reclassified from Accumulated other comprehensive loss into Net income within the next 12 months. We incurred no ineffectiveness on these hedges during the quarter ended March 31, 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 March 31, 2017 2016 Realized gain (loss): Aluminum $ 4.6 $ (2.7 ) Natural gas — (1.7 ) Alloy Hedges 0.1 — Total realized gain (loss) 1 $ 4.7 $ (4.4 ) Unrealized gain (loss): Aluminum $ 16.3 $ 3.2 Natural gas (1.2 ) 0.8 Total unrealized gain 2 $ 15.1 $ 4.0 ______________________ 1 Recorded within Cost of products sold, excluding depreciation, amortization and other items. 2 Recorded within Unrealized gain on derivative instruments. 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): March 31, 2017 Level 1 Level 2 Level 3 Total DERIVATIVE ASSETS: Non-Designated Hedges: Aluminum – Put option purchase contracts $ — $ 0.1 $ — $ 0.1 Fixed price purchase contracts — 18.4 — 18.4 Midwest premium swap contracts — 1.8 — 1.8 Natural gas – Fixed price purchase contracts — 0.7 — 0.7 Designated Hedges: Alloying metals – Fixed price purchase contracts — 0.2 — 0.2 Total derivative assets 1 $ — $ 21.2 $ — $ 21.2 March 31, 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 — (0.9 ) — (0.9 ) Natural gas – Fixed price purchase contracts — (0.7 ) — (0.7 ) Designated Hedges: Alloying metals – Fixed price purchase contracts — (0.1 ) — (0.1 ) Total derivative liabilities 2 $ — $ (1.8 ) $ — $ (1.8 ) ____________ 1 Of the $21.2 million in total derivative assets, $17.2 million and $4.0 million was recorded within Prepaid expenses and other current assets and Other assets, respectively. 2 Of the $1.8 million in total derivative liabilities, $1.1 million and $0.7 million was 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 assets 1 $ — $ 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 liabilities 2 $ — $ (1.8 ) $ — $ (1.8 ) ____________ 1 Of the $5.8 million in total derivative assets, $5.0 million and $0.8 million was 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 was recorded within Other accrued liabilities and Long-term liabilities, respectively. The aggregate fair value of our derivatives at March 31, 2017 and December 31, 2016 was a net asset of $19.4 million and a net asset of $4.0 million , respectively. The increase in the net asset position during the first quarter of 2017 was primarily due to changes in the underlying commodity and energy prices, as well as settlement of liability 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, some of which are subject to enforceable master netting arrangements and some of which are not. We reflect the fair value of our derivative contracts on a gross basis on the Consolidated Balance Sheets. We had no cash collateral pledged or received with our counterparties as of both March 31, 2017 and December 31, 2016 . The following tables present offsetting information regarding our derivatives by type of counterparty as of March 31, 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) $ 21.2 $ — $ 21.2 $ 1.8 $ 19.4 Total $ 21.2 $ — $ 21.2 $ 1.8 $ 19.4 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) $ (1.8 ) $ — $ (1.8 ) $ (1.8 ) $ — Total $ (1.8 ) $ — $ (1.8 ) $ (1.8 ) $ — 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 March 31, 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 March 31, 2017 and March 31, 2016 , the total unrealized loss, net of tax, included in Accumulated other comprehensive loss was immaterial and was not other-than-temporarily impaired. We believe that it is probable that the principal and interest will be collected in accordance with the contractual terms, and that the unrealized loss on these securities were due to changes in normal market fluctuations, and were not due to increased credit risk or other valuation concerns. 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 March 31, 2017 (in millions of dollars): Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 23.5 $ 10.9 $ — $ 34.4 Short-term investments — 195.5 — 195.5 Total $ 23.5 $ 206.4 $ — $ 229.9 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

Net Income Per Share and Stockh

Net Income Per Share and Stockholders' Equity	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	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 March 31, 2017 2016 Numerator: Net income $ 36.0 $ 26.3 Denominator – Weighted-average common shares outstanding (in thousands): Basic 1 17,385 17,864 Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options 218 336 Diluted 2 17,603 18,200 Net income per common share, Basic: $ 2.07 $ 1.47 Net income per common share, Diluted: $ 2.04 $ 1.44 ______________________ 1 The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares. 2 The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method. The following securities were excluded from the weighted-average diluted shares computation for the quarters ended March 31, 2017 and March 31, 2016 as their inclusion would have been anti-dilutive (in thousands of shares): Quarter Ended March 31, 2017 2016 Options to purchase common shares 2 17 Non-vested common shares, restricted stock units and performance shares 64 33 Total excluded 66 50 Dividends . During the quarters ended March 31, 2017 and March 31, 2016 , we paid a total of approximately $9.3 million and $8.2 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. Treasury Stock . From time to time, we repurchase shares pursuant to a stock repurchase program authorized by our Board of Directors. Repurchase transactions will occur at such times and prices as management deems appropriate and will be funded with our excess liquidity after giving consideration to, among other things, internal and external growth opportunities and future cash flows. Repurchases may be in open-market transactions or in privately negotiated transactions and the program may be modified or terminated by our Board of Directors at any time. Repurchases of our common stock pursuant to the stock repurchase program is recorded as Treasury stock and consisted of the following for each period presented: Quarter Ended March 31, 2017 2016 Number of common shares repurchased 415,346 83,265 Weighted-average repurchase price (dollars per share) $ 78.70 $ 76.85 Total cost of repurchased common shares (in millions of dollars) $ 32.7 $ 6.4 At March 31, 2017 , $55.7 million were available to repurchase our common shares pursuant to the stock repurchase program (see Note 15 ).

Segment and Geographical Area I

Segment and Geographical Area Information	3 Months Ended
	Mar. 31, 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 March 31, 2017 , approximately 63% 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 March 31, 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 March 31, 2017 2016 Net sales: Fabricated Products $ 355.3 $ 343.2 Segment operating income (loss): Fabricated Products 1 $ 70.6 $ 57.9 All Other (11.1 ) (13.1 ) Total operating income $ 59.5 $ 44.8 Interest expense (5.6 ) (3.7 ) Other income, net 0.6 0.3 Income before income taxes $ 54.5 $ 41.4 Depreciation and amortization: Fabricated Products $ 9.4 $ 8.6 All Other 0.2 0.1 Total depreciation and amortization $ 9.6 $ 8.7 Capital expenditures: Fabricated Products $ 14.6 $ 25.8 All Other 0.2 0.1 Total capital expenditures $ 14.8 $ 25.9 _____________________ 1 Fabricated Products segment operating income included non-cash mark-to-market gain on primary aluminum, natural gas and foreign currency hedging activities, which totaled $15.1 million and $4.0 million for the quarters ended March 31, 2017 and March 31, 2016 , respectively. For further discussion regarding mark-to-market matters, see Note 8 . March 31, 2017 December 31, 2016 Assets: Fabricated Products $ 1,017.3 $ 969.4 All Other 1 395.8 474.1 Total assets $ 1,413.1 $ 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 8 ) and net deferred income tax assets. Net sales by end market applications for the Fabricated Products segment were as follows (in millions of dollars): Quarter Ended March 31, 2017 2016 Net sales: Aero/HS products $ 167.5 $ 176.9 Automotive Extrusions 53.0 48.4 GE products 123.2 105.4 Other products 11.6 12.5 Total net sales $ 355.3 $ 343.2 Geographic information for income taxes paid were as follows (in millions of dollars): Quarter Ended March 31, 2017 2016 Income taxes paid: Fabricated Products – Domestic $ 0.1 $ 0.1 Foreign 0.1 0.2 Total income taxes paid $ 0.2 $ 0.3 The aggregate foreign currency transaction gain (loss) included in Net income was immaterial for the quarters ended March 31, 2017 and March 31, 2016 . For the quarter ended March 31, 2017 , one customer represented 29% and another represented 10% of Fabricated Products Net sales. For the quarter ended March 31, 2016 , one customer represented 25% and another represented 10% of Fabricated Products Net Sales. At March 31, 2017 , one customer represented 19% and a second customer represented 16% of the trade receivables balance. One individual customer accounted for 18% and two individual customers each accounted for 12% of the trade receivables balance at December 31, 2016 . Information for delivery of our primary aluminum supply from our major suppliers were as follows: Quarter Ended March 31, 2017 2016 Percentage of total primary aluminum supply (lbs): Supply from our top five major suppliers 86 % 83 % Supply from our largest supplier 37 % 30 % Supply from our second and third largest suppliers 34 % 35 %

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Quarter Ended March 31, 2017 2016 (In millions of dollars) Interest paid $ 0.3 $ 0.3 Non-cash investing and financing activities (included in Accounts payable): Unpaid purchases of property and equipment $ 3.7 $ 2.0 Stock repurchases not yet settled $ 2.0 $ 0.1 Cash and cash equivalents $ 34.4 $ 70.7 Restricted cash included in Prepaid expenses and other current assets 0.3 0.3 Restricted cash included in Other assets 12.0 10.9 Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows $ 46.7 $ 81.9

Other Income, Net

Other Income, Net	3 Months Ended
	Mar. 31, 2017
Other Income and Expenses [Abstract]
Other Income, Net	Other Income, Net Other income, net consisted of the following for each period presented (in millions of dollars): Quarter Ended March 31, 2017 2016 Interest income $ — $ 0.1 Realized gain on investments 0.7 — All other (expense) income, net (0.1 ) 0.2 Other income, net $ 0.6 $ 0.3

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 Salaried VEBA and defined benefit pension plan: Beginning balance $ (37.1 ) $ (31.3 ) Amortization of net actuarial loss 1 0.2 0.1 Amortization of prior service cost 1 1.2 1.0 Less: income tax expense 2 (0.5 ) (0.4 ) Net amortization reclassified from AOCI to Net income 0.9 0.7 Translation impact on Canadian pension plan AOCI balance — 0.1 Other comprehensive income, net of tax 0.9 0.8 Ending balance $ (36.2 ) $ (30.5 ) Available for sale securities: Beginning balance $ 0.8 $ (0.1 ) Unrealized gain on available for sale securities 1.1 — Less: income tax expense (0.4 ) — Net unrealized gain on available for sale securities 0.7 — Reclassification of unrealized gain upon sale of available for sale securities 3 (0.9 ) — Less: income tax benefit 2 0.3 — Net unrealized gain reclassified from AOCI to Net income (0.6 ) — Other comprehensive income, net of tax 0.1 — Ending balance $ 0.9 $ (0.1 ) Foreign currency cash flow hedges: Beginning balance $ (0.1 ) $ (0.2 ) Unrealized gain on foreign currency cash flow hedges — 0.2 Less: income tax benefit — (0.1 ) Net unrealized gain on foreign currency cash flow hedges — 0.1 Unrealized loss reclassified from AOCI to Net income 4 0.2 — Less: income tax expense 2 (0.1 ) — Net unrealized loss reclassified from AOCI to Net income 0.1 — Other comprehensive income, net of tax 0.1 0.1 Ending balance $ — $ (0.1 ) Quarter Ended March 31, 2017 2016 Alloy Hedges: Beginning balance $ (0.1 ) $ — Unrealized gain on Alloy Hedges 0.3 — Less: income tax expense (0.1 ) — Net unrealized gain on Alloy Hedges 0.2 — Other comprehensive income, net of tax 0.2 — Ending balance $ 0.1 $ — Foreign currency translation: Beginning balance $ (0.2 ) $ (0.1 ) (Loss) gain on foreign currency translation — — Less: income tax (expense) benefit — — Other comprehensive (loss) income, net of tax — — Ending balance $ (0.2 ) $ (0.1 ) Total AOCI ending balance $ (35.4 ) $ (30.8 ) ________________ 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, net. We use the specific identification method to determine the amount reclassified out of AOCI. 4 Amounts reclassified out of AOCI relating to foreign currency cash flow hedges were related to equipment purchases placed into service during the period and will be included as a component of Depreciation and amortization over the life of the related assets acquired.

Condensed Guarantor and Non-Gua

Condensed Guarantor and Non-Guarantor Financial Information (Notes)	3 Months Ended
	Mar. 31, 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 March 31, 2017 and December 31, 2016 , and for the quarters ended March 31, 2017 and March 31, 2016 present: (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) March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ — $ 29.7 $ 4.7 $ — $ 34.4 Short-term investments — 195.5 — — 195.5 Receivables: Trade receivables – net — 151.5 5.5 — 157.0 Intercompany loans receivable 85.8 0.1 0.6 (86.5 ) — Other — 10.9 0.9 — 11.8 Inventories — 199.7 8.0 (4.2 ) 203.5 Prepaid expenses and other current assets 0.1 33.5 0.4 — 34.0 Total current assets 85.9 620.9 20.1 (90.7 ) 636.2 Investments in and advances to subsidiaries 1,059.1 40.5 — (1,099.6 ) — Property, plant and equipment – net — 504.9 30.9 — 535.8 Long-term intercompany loans receivable 33.6 — 4.2 (37.8 ) — Deferred tax assets – net — 136.0 — 4.8 140.8 Intangible assets – net — 26.0 — — 26.0 Goodwill — 37.2 — — 37.2 Other assets — 37.1 — — 37.1 Total $ 1,178.6 $ 1,402.6 $ 55.2 $ (1,223.3 ) $ 1,413.1 LIABILITIES AND STOCKHOLDERS ' EQUITY Current liabilities: Accounts payable $ 2.7 $ 76.1 $ 5.6 $ — $ 84.4 Intercompany loans payable — 86.4 0.1 (86.5 ) — Accrued salaries, wages and related expenses — 27.8 1.3 — 29.1 Other accrued liabilities 8.4 34.4 0.1 (2.5 ) 40.4 Total current liabilities 11.1 224.7 7.1 (89.0 ) 153.9 Net liabilities of Salaried VEBA — 28.3 — — 28.3 Deferred tax liabilities — — 3.3 — 3.3 Long-term intercompany loans payable — 37.8 — (37.8 ) — Long-term liabilities — 57.4 2.7 — 60.1 Long-term debt 368.9 — — — 368.9 Total liabilities 380.0 348.2 13.1 (126.8 ) 614.5 Total stockholders' equity 798.6 1,054.4 42.1 (1,096.5 ) 798.6 Total $ 1,178.6 $ 1,402.6 $ 55.2 $ (1,223.3 ) $ 1,413.1 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 March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Net sales $ — $ 346.8 $ 29.3 $ (20.8 ) $ 355.3 Costs and expenses: Cost of products sold: Cost of products sold, excluding depreciation and amortization and other items — 272.6 25.3 (20.1 ) 277.8 Unrealized gain on derivative instruments — (15.1 ) — — (15.1 ) Depreciation and amortization — 9.0 0.6 — 9.6 Selling, general, administrative, research and development: Selling, general, administrative, research and development 0.9 20.9 2.4 (0.5 ) 23.7 Net periodic postretirement benefit cost relating to Salaried VEBA — 1.1 — — 1.1 Gain on removal of Union VEBA net assets — (1.3 ) — — (1.3 ) Total selling, general, administrative, research and development 0.9 20.7 2.4 (0.5 ) 23.5 Total costs and expenses 0.9 287.2 28.3 (20.6 ) 295.8 Operating (loss) income (0.9 ) 59.6 1.0 (0.2 ) 59.5 Other (expense) income: Interest (expense) income (5.7 ) 0.1 — — (5.6 ) Other income, net — 0.6 — — 0.6 (Loss) income before income taxes (6.6 ) 60.3 1.0 (0.2 ) 54.5 Income tax provision — (20.8 ) (0.2 ) 2.5 (18.5 ) Earnings in equity of subsidiaries 42.6 0.6 — (43.2 ) — Net income $ 36.0 $ 40.1 $ 0.8 $ (40.9 ) $ 36.0 Comprehensive income $ 37.3 $ 41.4 $ 0.8 $ (42.2 ) $ 37.3 CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (In millions of dollars) Quarter Ended March 31, 2016 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Net sales $ — $ 335.7 $ 26.4 $ (18.9 ) $ 343.2 Costs and expenses: Cost of products sold: Cost of products sold, excluding depreciation and amortization and other items — 257.1 23.1 (18.2 ) 262.0 Lower of cost or market inventory write-down — 4.9 — — 4.9 Unrealized gain on derivative instruments — (4.0 ) — — (4.0 ) Depreciation and amortization — 8.2 0.5 — 8.7 Selling, general, administrative, research and development: Selling, general, administrative, research and development 0.8 23.6 2.2 (0.5 ) 26.1 Net periodic postretirement benefit cost relating to Salaried VEBA — 0.8 — — 0.8 Gain on removal of Union VEBA net assets — (0.1 ) — — (0.1 ) Total selling, general, administrative, research and development 0.8 24.3 2.2 (0.5 ) 26.8 Total costs and expenses 0.8 290.5 25.8 (18.7 ) 298.4 Operating (loss) income (0.8 ) 45.2 0.6 (0.2 ) 44.8 Other (expense) income: Interest (expense) income (4.3 ) 0.6 — — (3.7 ) Other income, net — 0.3 — — 0.3 (Loss) income before income taxes (5.1 ) 46.1 0.6 (0.2 ) 41.4 Income tax provision — (16.9 ) (0.2 ) 2.0 (15.1 ) Earnings in equity of subsidiaries 31.4 0.3 — (31.7 ) — Net income $ 26.3 $ 29.5 $ 0.4 $ (29.9 ) $ 26.3 Comprehensive income $ 27.2 $ 30.3 $ 0.5 $ (30.8 ) $ 27.2 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS (In millions of dollars) Quarter Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Cash flows from operating activities: Net cash (used in) provided by operating activities $ (0.3 ) $ 2.6 $ 1.8 $ — $ 4.1 Cash flows from investing activities: Capital expenditures — (14.7 ) (0.1 ) — (14.8 ) Purchase of available for sale securities — (74.7 ) — — (74.7 ) Proceeds from disposition of available for sale securities — 110.9 — — 110.9 Intercompany loans receivable 46.6 — 0.7 (47.3 ) — Net cash provided by investing activities 46.6 21.5 0.6 (47.3 ) 21.4 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 (4.4 ) — — — (4.4 ) Repurchase of common stock (32.6 ) — — — (32.6 ) Cash dividends and dividend equivalents paid (9.3 ) — — — (9.3 ) Intercompany loans payable — (47.3 ) — 47.3 — Net cash used in financing activities (46.3 ) (47.5 ) — 47.3 (46.5 ) Net (decrease) increase in cash, cash equivalents and restricted cash during the period — (23.4 ) 2.4 — (21.0 ) 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 $ — $ 41.7 $ 5.0 $ — $ 46.7 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS (In millions of dollars) Quarter Ended March 31, 2016 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Cash flows from operating activities: Net cash provided by operating activities 1 $ 17.2 $ 201.4 $ 2.7 $ (200.0 ) $ 21.3 Cash flows from investing activities: Capital expenditures — (25.3 ) (0.6 ) — (25.9 ) Proceeds from disposition of available for sale securities — 20.0 — — 20.0 Net cash used in investing activities — (5.3 ) (0.6 ) — (5.9 ) Cash flows from financing activities: Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (2.7 ) — — — (2.7 ) Repurchase of common stock (6.3 ) — — — (6.3 ) Cash dividends and dividend equivalents paid (8.2 ) — — — (8.2 ) Cash dividends paid to Parent — (200.0 ) — 200.0 — Intercompany loan — 0.8 (0.8 ) — — Net cash used in financing activities (17.2 ) (199.2 ) (0.8 ) 200.0 (17.2 ) Net (decrease) increase in cash, cash equivalents and restricted cash during the period — (3.1 ) 1.3 — (1.8 ) 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 $ — $ 79.9 $ 2.0 $ — $ 81.9 ________________ 1 The Guarantor Subsidiaries’ Net cash provided by operating activities reflects a decrease in current Intercompany receivables from the Parent and an increase in current Intercompany payable to the Parent related to the $200.0 million dividend made by the Guarantor Subsidiaries to the Parent. The dividend to the Parent and intercompany activity is eliminated within the consolidating adjustments.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration . On April 17, 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 $8.7 million (including dividend equivalents) on or about May 15, 2017 to stockholders of record and the holders of certain restricted stock units at the close of business on April 27, 2017 . Authorization for Additional Share Repurchases. On April 17, 2017 , we announced that our Board of Directors authorized an additional $100.0 million for share repurchases under our share repurchase program. 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. As of April 17, 2017 , $148.8 million remained available for repurchases of our common shares pursuant to the stock repurchase program.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 during the remainder of 2016 or the first quarter of 2017. Finished products, work-in-process and raw material inventories are stated on the last-in, first-out ("LIFO") basis. At March 31, 2017 , the current cost of inventory exceeded its stated LIFO value by $1.9 million . At December 31, 2016 (after inventory write-down adjustments) 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 March 31, 2017 and December 31, 2016 were included in the Fabricated Products segment (see Note 2 for the components of inventories).
Property, Plant and Equipment - Net	Property, Plant and Equipment – Net. Property, plant and equipment – 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 $0.5 million and $0.9 million during the quarters ended March 31, 2017 and March 31, 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 $26.8 million at both March 31, 2017 and December 31, 2016 . However, we account for our workers' compensation accrued liability on a discounted basis, using a discount rate of 2.00% at both March 31, 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 $3.8 million and $3.6 million for the periods ended March 31, 2017 and December 31, 2016 , respectively.
Derivative Financial Instruments	Derivative Financial Instruments. Hedging transactions using derivative financial instruments are primarily designed to mitigate our exposure to changes in the market price of aluminum, alloying metals and energy and, to a lesser extent, to mitigate our exposure to changes in foreign currency exchange rates. From time to time, we also enter into hedging arrangements in connection with financing transactions to mitigate financial risks. We do not utilize derivative financial instruments for trading or other speculative purposes. Our derivative activities are initiated within guidelines established by management and approved by our Board of Directors. 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 recognize derivative instruments as assets or liabilities in our Consolidated Balance Sheets and measure these instruments at fair value by "marking-to-market" all of our hedging positions at each period's end (see Note 8 ). Because we do not meet the documentation requirements for hedge (deferral) accounting related to aluminum and energy derivatives, unrealized and realized gains and losses associated with these hedges are reflected as a reduction or increase, respectively, in: (i) Unrealized gain on derivative instruments and (ii) 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. These derivative instruments are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. Both realized and unrealized periodic gains and losses of derivative instruments designated as cash flow hedges are deferred in Accumulated other comprehensive loss until depreciation on the underlying equipment commences. Upon commencement, realized gains and losses are recorded in Net income as an adjustment to depreciation expense in the period in which depreciation is recognized on the underlying equipment. Additionally, to limit our economic (i.e. cash exposure) to future price increases of alloying metals, such as zinc and/or copper, used as raw materials in our fabrication operations, we enter into forward swap contracts ("Alloy Hedges"). These Alloy Hedges are designated and qualify for cash flow hedge accounting and are adjusted to current market values each reporting period. 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, excluding depreciation and amortization and other items. Depending on the time to maturity and asset or liability position, the carrying values of cash flow hedges are included in Prepaid expenses and other current assets, Other assets, Other accrued liabilities or Long-term liabilities. We report the effective portion of our cash flow hedges in the same financial statement line item as changes in the fair value of the hedged item.
Fair Value Measurement, Policy [Policy Text Block]	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 as required by GAAP include our derivative instruments and available for sale securities, consisting of debt investment securities and investments related to our deferred compensation plan (see Note 5 ). Additionally, we measure at fair value once each year at December 31 the plan assets of the Salaried VEBA (defined in Note 5 ) and our Canadian defined benefit pension plan. We record our remaining financial assets and liabilities at carrying value. The majority of our non-financial assets and liabilities, which include goodwill, intangible assets, inventories and property, plant and equipment, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur (or at least annually for goodwill), an evaluation of the affected non-financial asset or liability is required, potentially resulting in an adjustment to the carrying amount of such asset or liability. As of March 31, 2017 , following a qualitative review of operations at the Chandler, Arizona (Extrusion) facility, we determined that no adjustment to the carrying value of its goodwill or intangible asset was required. However, if the facility is unable to reduce its costs and/or increase sales volumes in the near term, it is reasonably possible that the carrying values of its related assets, including goodwill, could be reduced within the next 12 months . 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 ended March 31, 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 expect to adopt ASU 2014-09, including its subsequent amendments discussed above, using the modified retrospective transition approach for the fiscal year ending December 31, 2018. Based on our initial assessment, we have concluded that revenue from certain contracts will continue to be recognized at a point-in-time, while revenue from other contracts, primarily from our Aero/HS products and Automotive Extrusions, will be required to be recognized over time. We are currently assessing the impact that over-time recognition will have on our consolidated financial statements. 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. 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 ; and (iii) ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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.

Supplemental Balance Sheet In24

Supplemental Balance Sheet Information Supplemental Balance Sheet Information (Tables)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Balance Sheet Disclosures	March 31, 2017 December 31, 2016 (In millions of dollars) Cash and Cash Equivalents Cash and money market funds $ 23.5 $ 37.9 Commercial paper 10.9 17.3 Total $ 34.4 $ 55.2 Trade Receivables – Net Billed trade receivables $ 157.6 $ 138.2 Unbilled trade receivables 0.5 0.3 Trade receivables, gross 158.1 138.5 Allowance for doubtful receivables (1.1 ) (0.8 ) Trade receivables – net $ 157.0 $ 137.7 Inventories Finished products $ 68.4 $ 73.8 Work-in-process 75.3 71.7 Raw materials 54.7 51.1 Operating supplies 5.1 5.0 Total $ 203.5 $ 201.6 Property, Plant and Equipment – Net Land and improvements $ 22.7 $ 22.7 Buildings and leasehold improvements 89.0 88.6 Machinery and equipment 620.8 615.1 Construction in progress 42.3 34.8 Property, plant and equipment – gross 774.8 761.2 Accumulated depreciation (239.3 ) (230.6 ) Assets held for sale 0.3 0.3 Property, plant and equipment – net $ 535.8 $ 530.9 March 31, 2017 December 31, 2016 (In millions of dollars) Other Accrued Liabilities Uncleared cash disbursements $ 4.6 $ 5.8 Accrued income taxes and taxes payable 9.5 4.3 Accrued annual contribution to VEBAs 11.5 20.0 Accrued interest 8.4 2.9 Other 6.4 7.1 Total $ 40.4 $ 40.1 Long-Term Liabilities Workers' compensation accruals $ 24.5 $ 25.0 Long-term environmental accrual – Note 7 15.8 15.8 Long-term portion of contingent contribution to Union VEBA – Note 5 — 12.8 Other long-term liabilities 19.8 19.6 Total $ 60.1 $ 73.2

Income Tax Matters (Tables)

Income Tax Matters (Tables)	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax Provision	The provision for in comes taxes for each period presented consisted of the following (in millions of dollars): Quarter Ended March 31, 2017 2016 Domestic $ 18.3 $ 14.9 Foreign 0.2 0.2 Total $ 18.5 $ 15.1

Employee Benefits (Tables)

Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [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 March 31, 2017 2016 Salaried VEBA: Service cost 1 $ — $ — Interest cost 0.7 0.7 Expected return on plan assets (1.0 ) (1.0 ) Amortization of prior service cost 1.2 1.0 Amortization of net actuarial loss 0.2 0.1 Total net periodic postretirement benefit cost relating to Salaried VEBA $ 1.1 $ 0.8 ____________ 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 March 31, 2017 2016 Included within Fabricated Products: Deferred compensation plan $ 0.1 $ — Defined contribution plans 4.1 3.6 Multiemployer pension plans 1.1 1.1 Total Fabricated Products $ 5.3 $ 4.7 Included within All Other: Net periodic postretirement benefit cost relating to Salaried VEBA $ 1.1 $ 0.8 (Gain) loss on removal of Union VEBA net assets (1.3 ) (0.1 ) Deferred compensation plan 0.4 0.1 Defined contribution plans 0.5 0.4 Total All Other $ 0.7 $ 1.2 Total $ 6.0 $ 5.9

Employee Incentive Plans (Table

Employee Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 Non-vested common shares and restricted stock units $ 1.3 $ 1.1 TSR-Based Performance Shares 1.3 1.1 CP-Based Performance Shares 0.4 0.1 EVA-Based Performance Shares — 0.3 Total non-cash compensation expense $ 3.0 $ 2.6 The following table presents the allocation of the charges detailed above, by segment (in millions of dollars): Quarter Ended March 31, 2017 2016 Fabricated Products $ 1.2 $ 0.8 All Other 1.8 1.8 Total non-cash compensation expense $ 3.0 $ 2.6
Unrecognized gross compensation cost data	The following table presents unrecognized gross compensation cost data by type of award as of March 31, 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 $ 8.7 2.3 TSR-Based Performance Shares $ 8.1 2.0 CP-Based Performance Shares $ 7.6 2.6 EVA-Based Performance Shares $ 1.1 2.9
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 quarter ended March 31, 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 Shares Weighted-Average 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 — $ — Granted 1 — — 62,275 73.14 65,044 97.88 65,044 79.69 32,504 79.69 Vested (36,406 ) 67.63 (8,321 ) 77.04 (94,082 ) 83.18 — — — — Forfeited 1 — — (3,425 ) 82.32 (1,340 ) 97.88 (1,340 ) 79.69 (670 ) 79.69 Canceled 1 — — — — (55,288 ) 83.18 — — — — Outstanding at March 31, 2017 78,252 $ 70.39 112,329 $ 73.56 308,859 $ 95.31 127,382 $ 80.07 31,834 $ 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 March 31, 2017 2016 Restricted stock units $ 73.14 $ 74.49 TSR-Based Performance Shares $ 97.88 $ 93.02 CP-Based Performance Shares $ 79.69 $ 80.46 EVA-Based Performance Shares $ 79.69 $ —

Derivatives, Hedging Programs28

Derivatives, Hedging Programs and Other Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of material derivative positions	The following table summarizes our derivative positions at March 31, 2017 : Aluminum Maturity Period (month/year) Notional Amount of contracts (mmlbs) Purchased put option contracts 7/17 through 12/17 26.8 Fixed price purchase contracts 4/17 through 12/21 205.8 Fixed price sales contracts 4/17 through 6/18 1.4 Midwest premium swap contracts 1 4/17 through 12/21 203.5 Alloying Metals Maturity Period (month/year) Notional Amount of contracts (mmlbs) Fixed price purchase contracts 4/17 through 12/17 5.7 Natural Gas 2 Maturity Period (month/year) Notional Amount of contracts (mmbtu) Fixed price purchase contracts 4/17 through 12/19 4,640,000 Euro Maturity Period (month/year) Notional Amount of contracts (euro) Fixed price purchase contracts 8/17 105,600 ______________________ 1 Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on our purchases of primary aluminum. 2 As of March 31, 2017 , we had derivative and/or physical delivery commitments with energy companies in place to cover exposure to fluctuations in prices for approximately 74% , 72% and 61% of the expected natural gas purchases for the remainder of 2017 , 2018 and 2019 respectively.
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 March 31, 2017 2016 Realized gain (loss): Aluminum $ 4.6 $ (2.7 ) Natural gas — (1.7 ) Alloy Hedges 0.1 — Total realized gain (loss) 1 $ 4.7 $ (4.4 ) Unrealized gain (loss): Aluminum $ 16.3 $ 3.2 Natural gas (1.2 ) 0.8 Total unrealized gain 2 $ 15.1 $ 4.0 ______________________ 1 Recorded within Cost of products sold, excluding depreciation, amortization and other items. 2 Recorded within Unrealized gain on derivative instruments.
Schedule of Offsetting Derivative Instruments by Counterparty	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 ) The following tables present offsetting information regarding our derivatives by type of counterparty as of March 31, 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) $ 21.2 $ — $ 21.2 $ 1.8 $ 19.4 Total $ 21.2 $ — $ 21.2 $ 1.8 $ 19.4 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) $ (1.8 ) $ — $ (1.8 ) $ (1.8 ) $ — Total $ (1.8 ) $ — $ (1.8 ) $ (1.8 ) $ —
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): 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 assets 1 $ — $ 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 liabilities 2 $ — $ (1.8 ) $ — $ (1.8 ) ____________ 1 Of the $5.8 million in total derivative assets, $5.0 million and $0.8 million was 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 was 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): March 31, 2017 Level 1 Level 2 Level 3 Total DERIVATIVE ASSETS: Non-Designated Hedges: Aluminum – Put option purchase contracts $ — $ 0.1 $ — $ 0.1 Fixed price purchase contracts — 18.4 — 18.4 Midwest premium swap contracts — 1.8 — 1.8 Natural gas – Fixed price purchase contracts — 0.7 — 0.7 Designated Hedges: Alloying metals – Fixed price purchase contracts — 0.2 — 0.2 Total derivative assets 1 $ — $ 21.2 $ — $ 21.2 March 31, 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 — (0.9 ) — (0.9 ) Natural gas – Fixed price purchase contracts — (0.7 ) — (0.7 ) Designated Hedges: Alloying metals – Fixed price purchase contracts — (0.1 ) — (0.1 ) Total derivative liabilities 2 $ — $ (1.8 ) $ — $ (1.8 ) ____________ 1 Of the $21.2 million in total derivative assets, $17.2 million and $4.0 million was recorded within Prepaid expenses and other current assets and Other assets, respectively. 2 Of the $1.8 million in total derivative liabilities, $1.1 million and $0.7 million was recorded within Other accrued liabilities and Long-term liabilities, respectively.
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 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 The following table presents our other financial assets, classified under the appropriate level of the fair value hierarchy, as of March 31, 2017 (in millions of dollars): Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 23.5 $ 10.9 $ — $ 34.4 Short-term investments — 195.5 — 195.5 Total $ 23.5 $ 206.4 $ — $ 229.9

Net Income Per Share and Stoc29

Net Income Per Share and Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 Numerator: Net income $ 36.0 $ 26.3 Denominator – Weighted-average common shares outstanding (in thousands): Basic 1 17,385 17,864 Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options 218 336 Diluted 2 17,603 18,200 Net income per common share, Basic: $ 2.07 $ 1.47 Net income per common share, Diluted: $ 2.04 $ 1.44 ______________________ 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 ended March 31, 2017 and March 31, 2016 as their inclusion would have been anti-dilutive (in thousands of shares): Quarter Ended March 31, 2017 2016 Options to purchase common shares 2 17 Non-vested common shares, restricted stock units and performance shares 64 33 Total excluded 66 50

Segment and Geographical Area30

Segment and Geographical Area Information (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Summary of financial information by operating segment	Quarter Ended March 31, 2017 2016 Net sales: Fabricated Products $ 355.3 $ 343.2 Segment operating income (loss): Fabricated Products 1 $ 70.6 $ 57.9 All Other (11.1 ) (13.1 ) Total operating income $ 59.5 $ 44.8 Interest expense (5.6 ) (3.7 ) Other income, net 0.6 0.3 Income before income taxes $ 54.5 $ 41.4 Depreciation and amortization: Fabricated Products $ 9.4 $ 8.6 All Other 0.2 0.1 Total depreciation and amortization $ 9.6 $ 8.7 Capital expenditures: Fabricated Products $ 14.6 $ 25.8 All Other 0.2 0.1 Total capital expenditures $ 14.8 $ 25.9 _____________________ 1 Fabricated Products segment operating income included non-cash mark-to-market gain on primary aluminum, natural gas and foreign currency hedging activities, which totaled $15.1 million and $4.0 million for the quarters ended March 31, 2017 and March 31, 2016 , respectively. For further discussion regarding mark-to-market matters, see Note 8 . March 31, 2017 December 31, 2016 Assets: Fabricated Products $ 1,017.3 $ 969.4 All Other 1 395.8 474.1 Total assets $ 1,413.1 $ 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 8 ) and net deferred income tax assets.
Schedule of net sales by end market segment applications	Net sales by end market applications for the Fabricated Products segment were as follows (in millions of dollars): Quarter Ended March 31, 2017 2016 Net sales: Aero/HS products $ 167.5 $ 176.9 Automotive Extrusions 53.0 48.4 GE products 123.2 105.4 Other products 11.6 12.5 Total net sales $ 355.3 $ 343.2
Schedule of income taxes paid by geographical area	Geographic information for income taxes paid were as follows (in millions of dollars): Quarter Ended March 31, 2017 2016 Income taxes paid: Fabricated Products – Domestic $ 0.1 $ 0.1 Foreign 0.1 0.2 Total income taxes paid $ 0.2 $ 0.3
Schedule of information for contractual delivery of primary aluminum supply from major suppliers	Information for delivery of our primary aluminum supply from our major suppliers were as follows: Quarter Ended March 31, 2017 2016 Percentage of total primary aluminum supply (lbs): Supply from our top five major suppliers 86 % 83 % Supply from our largest supplier 37 % 30 % Supply from our second and third largest suppliers 34 % 35 %

Supplemental Cash Flow Inform31

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Quarter Ended March 31, 2017 2016 (In millions of dollars) Interest paid $ 0.3 $ 0.3 Non-cash investing and financing activities (included in Accounts payable): Unpaid purchases of property and equipment $ 3.7 $ 2.0 Stock repurchases not yet settled $ 2.0 $ 0.1 Cash and cash equivalents $ 34.4 $ 70.7 Restricted cash included in Prepaid expenses and other current assets 0.3 0.3 Restricted cash included in Other assets 12.0 10.9 Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows $ 46.7 $ 81.9

Other Income, Net (Tables)

Other Income, Net (Tables)	3 Months Ended
	Mar. 31, 2017
Other Income and Expenses [Abstract]
Other Income, Net	Other income, net consisted of the following for each period presented (in millions of dollars): Quarter Ended March 31, 2017 2016 Interest income $ — $ 0.1 Realized gain on investments 0.7 — All other (expense) income, net (0.1 ) 0.2 Other income, net $ 0.6 $ 0.3

Accumulated Other Comprehensi33

Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Quarter Ended March 31, 2017 2016 Salaried VEBA and defined benefit pension plan: Beginning balance $ (37.1 ) $ (31.3 ) Amortization of net actuarial loss 1 0.2 0.1 Amortization of prior service cost 1 1.2 1.0 Less: income tax expense 2 (0.5 ) (0.4 ) Net amortization reclassified from AOCI to Net income 0.9 0.7 Translation impact on Canadian pension plan AOCI balance — 0.1 Other comprehensive income, net of tax 0.9 0.8 Ending balance $ (36.2 ) $ (30.5 ) Available for sale securities: Beginning balance $ 0.8 $ (0.1 ) Unrealized gain on available for sale securities 1.1 — Less: income tax expense (0.4 ) — Net unrealized gain on available for sale securities 0.7 — Reclassification of unrealized gain upon sale of available for sale securities 3 (0.9 ) — Less: income tax benefit 2 0.3 — Net unrealized gain reclassified from AOCI to Net income (0.6 ) — Other comprehensive income, net of tax 0.1 — Ending balance $ 0.9 $ (0.1 ) Foreign currency cash flow hedges: Beginning balance $ (0.1 ) $ (0.2 ) Unrealized gain on foreign currency cash flow hedges — 0.2 Less: income tax benefit — (0.1 ) Net unrealized gain on foreign currency cash flow hedges — 0.1 Unrealized loss reclassified from AOCI to Net income 4 0.2 — Less: income tax expense 2 (0.1 ) — Net unrealized loss reclassified from AOCI to Net income 0.1 — Other comprehensive income, net of tax 0.1 0.1 Ending balance $ — $ (0.1 ) Quarter Ended March 31, 2017 2016 Alloy Hedges: Beginning balance $ (0.1 ) $ — Unrealized gain on Alloy Hedges 0.3 — Less: income tax expense (0.1 ) — Net unrealized gain on Alloy Hedges 0.2 — Other comprehensive income, net of tax 0.2 — Ending balance $ 0.1 $ — Foreign currency translation: Beginning balance $ (0.2 ) $ (0.1 ) (Loss) gain on foreign currency translation — — Less: income tax (expense) benefit — — Other comprehensive (loss) income, net of tax — — Ending balance $ (0.2 ) $ (0.1 ) Total AOCI ending balance $ (35.4 ) $ (30.8 )

Condensed Guarantor and Non-G34

Condensed Guarantor and Non-Guarantor Financial Information Condensed Guarantor and Non-Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 2017
Condensed Guarantor and Non Guarantor Financial Statements Text Block [Abstract]
Condensed Financial Statements [Table Text Block]	CONDENSED CONSOLIDATING BALANCE SHEET (In millions of dollars) March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ — $ 29.7 $ 4.7 $ — $ 34.4 Short-term investments — 195.5 — — 195.5 Receivables: Trade receivables – net — 151.5 5.5 — 157.0 Intercompany loans receivable 85.8 0.1 0.6 (86.5 ) — Other — 10.9 0.9 — 11.8 Inventories — 199.7 8.0 (4.2 ) 203.5 Prepaid expenses and other current assets 0.1 33.5 0.4 — 34.0 Total current assets 85.9 620.9 20.1 (90.7 ) 636.2 Investments in and advances to subsidiaries 1,059.1 40.5 — (1,099.6 ) — Property, plant and equipment – net — 504.9 30.9 — 535.8 Long-term intercompany loans receivable 33.6 — 4.2 (37.8 ) — Deferred tax assets – net — 136.0 — 4.8 140.8 Intangible assets – net — 26.0 — — 26.0 Goodwill — 37.2 — — 37.2 Other assets — 37.1 — — 37.1 Total $ 1,178.6 $ 1,402.6 $ 55.2 $ (1,223.3 ) $ 1,413.1 LIABILITIES AND STOCKHOLDERS ' EQUITY Current liabilities: Accounts payable $ 2.7 $ 76.1 $ 5.6 $ — $ 84.4 Intercompany loans payable — 86.4 0.1 (86.5 ) — Accrued salaries, wages and related expenses — 27.8 1.3 — 29.1 Other accrued liabilities 8.4 34.4 0.1 (2.5 ) 40.4 Total current liabilities 11.1 224.7 7.1 (89.0 ) 153.9 Net liabilities of Salaried VEBA — 28.3 — — 28.3 Deferred tax liabilities — — 3.3 — 3.3 Long-term intercompany loans payable — 37.8 — (37.8 ) — Long-term liabilities — 57.4 2.7 — 60.1 Long-term debt 368.9 — — — 368.9 Total liabilities 380.0 348.2 13.1 (126.8 ) 614.5 Total stockholders' equity 798.6 1,054.4 42.1 (1,096.5 ) 798.6 Total $ 1,178.6 $ 1,402.6 $ 55.2 $ (1,223.3 ) $ 1,413.1 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 March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Net sales $ — $ 346.8 $ 29.3 $ (20.8 ) $ 355.3 Costs and expenses: Cost of products sold: Cost of products sold, excluding depreciation and amortization and other items — 272.6 25.3 (20.1 ) 277.8 Unrealized gain on derivative instruments — (15.1 ) — — (15.1 ) Depreciation and amortization — 9.0 0.6 — 9.6 Selling, general, administrative, research and development: Selling, general, administrative, research and development 0.9 20.9 2.4 (0.5 ) 23.7 Net periodic postretirement benefit cost relating to Salaried VEBA — 1.1 — — 1.1 Gain on removal of Union VEBA net assets — (1.3 ) — — (1.3 ) Total selling, general, administrative, research and development 0.9 20.7 2.4 (0.5 ) 23.5 Total costs and expenses 0.9 287.2 28.3 (20.6 ) 295.8 Operating (loss) income (0.9 ) 59.6 1.0 (0.2 ) 59.5 Other (expense) income: Interest (expense) income (5.7 ) 0.1 — — (5.6 ) Other income, net — 0.6 — — 0.6 (Loss) income before income taxes (6.6 ) 60.3 1.0 (0.2 ) 54.5 Income tax provision — (20.8 ) (0.2 ) 2.5 (18.5 ) Earnings in equity of subsidiaries 42.6 0.6 — (43.2 ) — Net income $ 36.0 $ 40.1 $ 0.8 $ (40.9 ) $ 36.0 Comprehensive income $ 37.3 $ 41.4 $ 0.8 $ (42.2 ) $ 37.3 CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (In millions of dollars) Quarter Ended March 31, 2016 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Net sales $ — $ 335.7 $ 26.4 $ (18.9 ) $ 343.2 Costs and expenses: Cost of products sold: Cost of products sold, excluding depreciation and amortization and other items — 257.1 23.1 (18.2 ) 262.0 Lower of cost or market inventory write-down — 4.9 — — 4.9 Unrealized gain on derivative instruments — (4.0 ) — — (4.0 ) Depreciation and amortization — 8.2 0.5 — 8.7 Selling, general, administrative, research and development: Selling, general, administrative, research and development 0.8 23.6 2.2 (0.5 ) 26.1 Net periodic postretirement benefit cost relating to Salaried VEBA — 0.8 — — 0.8 Gain on removal of Union VEBA net assets — (0.1 ) — — (0.1 ) Total selling, general, administrative, research and development 0.8 24.3 2.2 (0.5 ) 26.8 Total costs and expenses 0.8 290.5 25.8 (18.7 ) 298.4 Operating (loss) income (0.8 ) 45.2 0.6 (0.2 ) 44.8 Other (expense) income: Interest (expense) income (4.3 ) 0.6 — — (3.7 ) Other income, net — 0.3 — — 0.3 (Loss) income before income taxes (5.1 ) 46.1 0.6 (0.2 ) 41.4 Income tax provision — (16.9 ) (0.2 ) 2.0 (15.1 ) Earnings in equity of subsidiaries 31.4 0.3 — (31.7 ) — Net income $ 26.3 $ 29.5 $ 0.4 $ (29.9 ) $ 26.3 Comprehensive income $ 27.2 $ 30.3 $ 0.5 $ (30.8 ) $ 27.2 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS (In millions of dollars) Quarter Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Cash flows from operating activities: Net cash (used in) provided by operating activities $ (0.3 ) $ 2.6 $ 1.8 $ — $ 4.1 Cash flows from investing activities: Capital expenditures — (14.7 ) (0.1 ) — (14.8 ) Purchase of available for sale securities — (74.7 ) — — (74.7 ) Proceeds from disposition of available for sale securities — 110.9 — — 110.9 Intercompany loans receivable 46.6 — 0.7 (47.3 ) — Net cash provided by investing activities 46.6 21.5 0.6 (47.3 ) 21.4 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 (4.4 ) — — — (4.4 ) Repurchase of common stock (32.6 ) — — — (32.6 ) Cash dividends and dividend equivalents paid (9.3 ) — — — (9.3 ) Intercompany loans payable — (47.3 ) — 47.3 — Net cash used in financing activities (46.3 ) (47.5 ) — 47.3 (46.5 ) Net (decrease) increase in cash, cash equivalents and restricted cash during the period — (23.4 ) 2.4 — (21.0 ) 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 $ — $ 41.7 $ 5.0 $ — $ 46.7 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS (In millions of dollars) Quarter Ended March 31, 2016 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating Adjustments Consolidated Cash flows from operating activities: Net cash provided by operating activities 1 $ 17.2 $ 201.4 $ 2.7 $ (200.0 ) $ 21.3 Cash flows from investing activities: Capital expenditures — (25.3 ) (0.6 ) — (25.9 ) Proceeds from disposition of available for sale securities — 20.0 — — 20.0 Net cash used in investing activities — (5.3 ) (0.6 ) — (5.9 ) Cash flows from financing activities: Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (2.7 ) — — — (2.7 ) Repurchase of common stock (6.3 ) — — — (6.3 ) Cash dividends and dividend equivalents paid (8.2 ) — — — (8.2 ) Cash dividends paid to Parent — (200.0 ) — 200.0 — Intercompany loan — 0.8 (0.8 ) — — Net cash used in financing activities (17.2 ) (199.2 ) (0.8 ) 200.0 (17.2 ) Net (decrease) increase in cash, cash equivalents and restricted cash during the period — (3.1 ) 1.3 — (1.8 ) 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 $ — $ 79.9 $ 2.0 $ — $ 81.9 ________________ 1 The Guarantor Subsidiaries’ Net cash provided by operating activities reflects a decrease in current Intercompany receivables from the Parent and an increase in current Intercompany payable to the Parent related to the $200.0 million dividend made by the Guarantor Subsidiaries to the Parent. The dividend to the Parent and intercompany activity is eliminated within the consolidating adjustments.

Summary of Significant Accoun35

Summary of Significant Accounting Policies, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Significant accounting policies
Inventory Write-down	$ 0	$ 4.9
Workers Compensation Liability Undiscounted	$ 26.8		$ 26.8
Workers' Compensation Discount, Percent	2.00%		2.00%
Accrued liabilities for employee healthcare benefits	$ 3.8		$ 3.6
Fabricated Products
Significant accounting policies
(Shortfalls) excess of current cost over the stated LIFO value of inventory	$ (1.9)		$ 8.5

Summary of Significant Accoun36

Summary of Significant Accounting Policies, Narrative, Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment
Interest expense capitalized as construction in progress	$ 0.5	$ 0.9

Supplemental Balance Sheet In37

Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents
Cash and money market funds	$ 23.5	$ 37.9
Commercial paper	10.9	17.3
Total	34.4	55.2
Trade Receivables – Net
Trade receivables, gross	158.1	138.5
Allowance for doubtful receivables	(1.1)	(0.8)
Trade receivables – net	157	137.7
Inventories
Finished products	68.4	73.8
Work-in-process	75.3	71.7
Raw materials	54.7	51.1
Operating supplies	5.1	5
Total	203.5	201.6
Property, Plant and Equipment – Net
Land and improvements	22.7	22.7
Buildings and leasehold improvements	89	88.6
Machinery and equipment	620.8	615.1
Construction in progress	42.3	34.8
Property, plant and equipment – gross	774.8	761.2
Accumulated depreciation	(239.3)	(230.6)
Assets held for sale	0.3	0.3
Property, plant and equipment – net	535.8	530.9
Other Accrued Liabilities
Uncleared cash disbursements	4.6	5.8
Accrued income taxes and taxes payable	9.5	4.3
Accrued annual contribution to VEBAs	11.5	20
Accrued interest	8.4	2.9
Other	6.4	7.1
Total	40.4	40.1
Long-Term Liabilities
Workers’ compensation accruals	24.5	25
Long-term environmental accrual	15.8	15.8
Long-term portion of contingent contribution to Union VEBA	0	12.8
Other long-term liabilities	19.8	19.6
Total	60.1	73.2
Billed
Trade Receivables – Net
Trade receivables, gross	157.6	138.2
Unbilled
Trade Receivables – Net
Trade receivables, gross	$ 0.5	$ 0.3

Debt and Credit Facility Debt a

Debt and Credit Facility Debt and Credit Facility, Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	May 15, 2016	Dec. 31, 2015	May 23, 2012
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 6,100,000
Long-term debt	$ 368,900,000			$ 368,700,000
Senior Notes Due 2024 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 375,000,000
Debt instrument contractual rate (percent)					5.875%
Debt Instrument, Interest Rate, Effective Percentage	6.10%
Debt issuance, percentage of principal amount					100.00%
Interest Expense, Long-term Debt	$ 5,700,000
Debt Instrument, Fair Value Disclosure	390,000,000			$ 390,800,000
Senior Notes Due 2020 | Senior Notes
Debt Instrument [Line Items]
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			$ 4,300,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Line of Credit Facility, Current Borrowing Capacity	293,900,000
Long-term Line of Credit	0
Line of Credit Facility, Remaining Borrowing Capacity	$ 286,200,000
Line of Credit Facility, Interest Rate at Period End	4.25%
Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Long-term Line of Credit	$ 7,700,000
On or after June 1, 2016 | Senior Notes Due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		104.125%

Income Tax Matters, Provision T

Income Tax Matters, Provision Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Tax Provision
Domestic	$ 18.3	$ 14.9
Foreign	0.2	0.2
Total	$ 18.5	$ 15.1

Income Tax Matters, Narrative (

Income Tax Matters, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision	$ 18.5	$ 15.1
Effective tax rate	34.00%	36.50%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ (1.6)	$ (0.7)
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent	(2.90%)	(1.70%)
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Amount	$ (0.4)	$ 0.3
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent	(0.80%)	0.70%
Gross unrecognized tax benefits that would impact effective tax rate	$ 1.8		$ 0.7

Employee Benefits, Net Periodic

Employee Benefits, Net Periodic Benefit Costs and Charges Relating To All Other Employee Benefit Plans(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Salaried VEBA:
Total net periodic postretirement benefit cost relating to Salaried VEBA	$ 1.1	$ 0.8
Gain on removal of Union VEBA net assets – Note 5	(1.3)	(0.1)
Multiemployer pension plans	1.1	1.1
Total other employee benefit plans	6	5.9
Fabricated Products
Salaried VEBA:
Deferred compensation plan	0.1	0
Defined contribution plans	4.1	3.6
Total other employee benefit plans	5.3	4.7
All Other
Salaried VEBA:
Deferred compensation plan	0.4	0.1
Defined contribution plans	0.5	0.4
Total other employee benefit plans	0.7	1.2
VEBAs | All Other
Salaried VEBA:
Service cost	0	0
Interest cost	0.7	0.7
Expected return on plan assets	(1)	(1)
Amortization of prior service cost	1.2	1
Amortization of net actuarial loss	0.2	0.1
Total net periodic postretirement benefit cost relating to Salaried VEBA	$ 1.1	$ 0.8

Employee Benefits, Defined Bene

Employee Benefits, Defined Benefit Plans Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	$ 11.5	$ 20
Union VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	17.1
Maximum contribution threshold	12.8
Accrued Veba contingent contribution - total	11.5
Salaried VEBA
VEBA Postretirement Medical Obligations
Accrued annual contribution to VEBAs	2.9
Maximum contribution threshold	2.9
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
VEBA Postretirement Medical Obligations
Deferred Compensation Plan Assets	$ 8.6	$ 8.2

Employee Incentive Plans, Short

Employee Incentive Plans, Short Term Incentive Plans (Details) $ in Millions	Mar. 31, 2017USD ($)
Short Term Incentive Plans
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Accrued Bonuses	$ 5.5

Employee Incentive Plans, Compe

Employee Incentive Plans, Compensation expense under LTI programs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3	$ 2.6
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	8.7
Allocated Share-based Compensation Expense	$ 1.3	1.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 4 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	$ 8.1
Allocated Share-based Compensation Expense	$ 1.3	1.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years
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	$ 7.6
Allocated Share-based Compensation Expense	$ 0.4	0.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 7 months
EVA - Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 1.1
Allocated Share-based Compensation Expense	$ 0	0.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 11 months
Fabricated Products
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1.2	0.8
All Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1.8	$ 1.8

Employee Incentive Plans, Unrec

Employee Incentive Plans, Unrecognized Compensation Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
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)	$ 8.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 4 months
TSR-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 8.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years
CP-Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 7.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 7 months
EVA - Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Gross Compensation Costs (in millions of dollars)	$ 1.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 11 months

Employee Incentive Plans, Summa

Employee Incentive Plans, Summary of Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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)	0
Vested (shares)	(36,406)
Forfeited (shares)	0
Canceled (shares)	0
Outstanding at March 31, 2017 (shares)	78,252
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
Weighted average grant-date fair value per unit - Vested (in dollars per share)	67.63
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)	0
Weighted average grant-date fair value per unit - Canceled (in dollars per share)	0
Weighted average grant-date fair value per unit - Outstanding at March 31, 2017 (in dollars per share)	$ 70.39
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2016 (shares)	61,800
Granted (shares)	62,275
Vested (shares)	(8,321)
Forfeited (shares)	(3,425)
Canceled (shares)	0
Outstanding at March 31, 2017 (shares)	112,329
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)	73.14	$ 74.49
Weighted average grant-date fair value per unit - Vested (in dollars per share)	77.04
Weighted average grant-date fair value per unit - Forfeited (in dollars per share)	82.32
Weighted average grant-date fair value per unit - Canceled (in dollars per share)	0
Weighted average grant-date fair value per unit - Outstanding at March 31, 2017 (in dollars per share)	$ 73.56
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)	(670)
Canceled (shares)	0
Outstanding at March 31, 2017 (shares)	31,834
Weighted average grant-date fair value per unit - Outstanding at December 31, 2016 (in dollars per share)	$ 0
Weighted average grant-date fair value per unit - Vested (in dollars per share)	0
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
Weighted average grant-date fair value per unit - Outstanding at March 31, 2017 (in dollars per share)	$ 79.69
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)	(1,340)
Canceled (shares)	0
Outstanding at March 31, 2017 (shares)	127,382
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)	79.69	80.46
Weighted average grant-date fair value per unit - Vested (in dollars per share)	0
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
Weighted average grant-date fair value per unit - Outstanding at March 31, 2017 (in dollars per share)	$ 80.07
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)	(1,340)
Canceled (shares)	(55,288)
Outstanding at March 31, 2017 (shares)	308,859
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)	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)	97.88
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 March 31, 2017 (in dollars per share)	$ 95.31

Employee Incentive Plans Employ

Employee Incentive Plans Employee Incentive Plans, Weighted Average Grant Date Fair Value (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
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)	$ 73.14	$ 74.49
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)	79.69	80.46
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)	97.88	93.02
EVA - Based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	$ 79.69	$ 0

Employee Incentive Plans Empl48

Employee Incentive Plans Employee Incentive Plans, Narrative (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested outstanding stock (shares)	1,543		1,543
Exercise price (in dollars per share)	$ 80.01		$ 80.01
Options granted during period (shares)	0
Options exercised during period (shares)	0
Options expired during period (shares)	0
Options forfeited in period (shares)	0
Shares withheld and canceled to satisfy minimum tax withholding (shares)	55,888	35,162
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 authorized for issuance under plan (shares)	1,045,000
Shares available for awards under the plan (shares)	768,191

Commitments and Contingencies,

Commitments and Contingencies, Environmental (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Environmental Contingency
Environmental accrual	$ 17.1
Expected period related to remediation expenditures for environmental contingencies period	30 years
Potential increase in environmental costs	$ 12.3
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

Derivatives, Hedging Programs50

Derivatives, Hedging Programs and Other Financial Instruments, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	$ 15.1	$ 4
Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	15.1	4
Cost of Sales [Member] | Alloy Metal Hedge [Member] | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	0.1	0
Cost of Sales [Member] | Aluminum | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	4.6	(2.7)
Cost of Sales [Member] | Operational Risk Hedges | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	4.7	(4.4)
Cost of Sales [Member] | Natural Gas | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Realized (losses) gains	0	(1.7)
Gain (Loss) on Derivative Instruments | Aluminum | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	16.3	3.2
Gain (Loss) on Derivative Instruments | Natural Gas | Not Designated as Hedging Instrument
Summary Of Realized And Unrealized Gains (Losses)
Unrealized gains (losses)	$ (1.2)	$ 0.8

Derivatives, Hedging Programs51

Derivatives, Hedging Programs and Other Financial Instruments, Material Derivative Positions (Details) mmlbs in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2017EUR (€)MMBTUmmlbs
Not Designated as Hedging Instrument | Option on Securities [Member] | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount				26.8
Not Designated as Hedging Instrument | Aluminum | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount				205.8
Not Designated as Hedging Instrument | Aluminum | Sales
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount				1.4
Not Designated as Hedging Instrument | Natural Gas | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU				4,640,000
Not Designated as Hedging Instrument | Midwest premium swap contracts [Member] | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount				203.5
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Purchase
Derivative [Line Items]
Derivative, Notional Amount | €				€ 105,600
Designated as Hedging Instrument | Alloy Metal Hedge [Member] | Purchase
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount				5.7
Scenario, Forecast [Member] | Natural Gas
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage	61.00%	72.00%	74.00%
Scenario, Forecast [Member] | Electricity Member
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage			54.00%

Derivatives, Hedging Programs52

Derivatives, Hedging Programs and Other Financial Instruments, Offsetting of Derivative Instruments by Counterparty (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	$ 21.2	$ 5.8
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	21.2	5.8
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.8	1.7
Net Amount	19.4	4.1
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(1.8)	(1.8)
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(1.8)	(1.8)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.8)	(1.7)
Net Amount	0	(0.1)
Counterparty (with Netting Agreements)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	21.2	3.3
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	21.2	3.3
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1.8	1
Net Amount	19.4	2.3
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(1.8)	(1)
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(1.8)	(1)
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	(1.8)	(1)
Net Amount	$ 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
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
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)

Derivatives, Hedging Programs53

Derivatives, Hedging Programs and Other Financial Instruments, Narrative (Details)	3 Months Ended
	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Debt Instrument, Term	12 months
Derivative Instruments in Hedges, at Fair Value, Net	$ 19,400,000	$ 4,000,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	100,000
Aggregate fair value of derivative instruments that contain credit-risk-related contingency features that were in a net liability position		$ 100,000
Margin Deposit Assets	0
Customer Deposits, Current	0
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	$ 0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument | Purchase
Derivative [Line Items]
Derivative, Average Forward Exchange Rate	1.12

Derivatives, Hedging Programs54

Derivatives, Hedging Programs and Other Financial Instruments Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 21.2	$ 5.8
Derivative Liability	(1.8)	(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	34.4	55.2
Derivative Asset	21.2	5.8
Derivative Liability	(1.8)	(1.8)
Other Assets, Fair Value Disclosure	229.9	286.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	23.5	37.9
Derivative Asset	0	0
Derivative Liability	0	0
Other Assets, Fair Value Disclosure	23.5	37.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10.9	17.3
Derivative Asset	21.2	5.8
Derivative Liability	(1.8)	(1.8)
Other Assets, Fair Value Disclosure	206.4	248.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Derivative Asset	0	0
Derivative Liability	0	0
Other Assets, Fair Value Disclosure	0	0
Not Designated as Hedging Instrument | Put Option [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.1
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1.8	0.9
Derivative Liability	(0.9)	(0.2)
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1.8	0.9
Derivative Liability	(0.9)	(0.2)
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument | Purchase | Natural Gas | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.7	1.6
Derivative Liability	(0.7)	(0.4)
Not Designated as Hedging Instrument | Purchase | Natural Gas | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument | Purchase | Natural Gas | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.7	1.6
Derivative Liability	(0.7)	(0.4)
Not Designated as Hedging Instrument | Purchase | Natural Gas | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	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	(0.1)	(1.1)
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	18.4	3.3
Derivative Liability	(0.1)	(1.1)
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument | Purchase | Put Option [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Not Designated as Hedging Instrument | Purchase | Put Option [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.1
Not Designated as Hedging Instrument | Purchase | Put Option [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.2
Derivative Liability	(0.1)	(0.1)
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Derivative Liability	0	0
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.2
Derivative Liability	(0.1)	(0.1)
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	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	195.5	231
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	195.5	231
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	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	17.2	5
Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4	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	1.1	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	$ 0.7	$ 1

Net Income Per Share and Stoc55

Net Income Per Share and Stockholders' Equity, Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income	$ 36	$ 26.3
Denominator — Weighted-average common shares outstanding (in thousands):
Basic (shares)	17,385	17,864
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options (shares)	218	336
Diluted (shares)	17,603	18,200
Net income per common share:
Basic (in dollars per share)	$ 2.07	$ 1.47
Earnings per common share, Diluted:
Diluted (in dollars per share)	$ 2.04	$ 1.44

Net Income Per Share and Stoc56

Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	66	50
Options to purchase common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2	17
Non-vested common shares, restricted stock units and performance shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	64	33

Net Income Per Share and Stoc57

Net Income Per Share and Stockholders' Equity Net Income Per Share and Stockholders' Equity, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Payments of Dividends	$ 9.3	$ 8.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 55.7

Net Income Per Share and Stoc58

Net Income Per Share and Stockholders' Equity Net Income Per Share and Stockholders' Equity, Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Treasury Stock, Shares, Acquired	415,346	83,265
Treasury Stock Acquired, Average Cost Per Share	$ 78.70	$ 76.85
Treasury Stock, Value, Acquired, Cost Method	$ 32.7	$ 6.4

Segment and Geographical Area59

Segment and Geographical Area Information by Operating Segment Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Net sales:
Net Sales	$ 355.3	$ 343.2
Segment operating income (loss):
Operating income (loss)	59.5	44.8
Interest expense	(5.6)	(3.7)
Other income, net	0.6	0.3
Income before income taxes	54.5	41.4
Depreciation and amortization:
Depreciation and amortization	9.6	8.7
Capital expenditures:
Capital expenditures	14.8	25.9
Assets:
Assets	1,413.1		$ 1,443.5
Unrealized Gain on Derivatives	15.1	4
Fabricated Products
Segment operating income (loss):
Operating income (loss)	70.6	57.9
Depreciation and amortization:
Depreciation and amortization	9.4	8.6
Capital expenditures:
Capital expenditures	14.6	25.8
Assets:
Assets	1,017.3		969.4
Unrealized Gain on Derivatives	15.1	4
All Other
Segment operating income (loss):
Operating income (loss)	(11.1)	(13.1)
Depreciation and amortization:
Depreciation and amortization	0.2	0.1
Capital expenditures:
Capital expenditures	0.2	$ 0.1
Assets:
Assets	$ 395.8		$ 474.1

Segment and Geographical Area60

Segment and Geographical Area Information, Net Sales by End Market Segment Applications (Details) - Fabricated Products - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Sales:
Net sales	$ 355.3	$ 343.2
Aero/HS products
Net Sales:
Net sales	167.5	176.9
Automotive Extrusions
Net Sales:
Net sales	53	48.4
GE products
Net Sales:
Net sales	123.2	105.4
Other products
Net Sales:
Net sales	$ 11.6	$ 12.5

Segment and Geographical Area61

Segment and Geographical Area Information, Income Taxes Paid by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information
Income Taxes Paid	$ 0.2	$ 0.3
Domestic
Segment Reporting Information
Income Taxes Paid	0.1	0.1
Foreign
Segment Reporting Information
Income Taxes Paid	$ 0.1	$ 0.2

Segment and Geographical Area62

Segment and Geographical Area Information, Supply Information (Details) - Supplier Concentration Risk - Aluminum	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Top five major suppliers
Concentration Risk
Concentration Risk, Percentage	86.00%	83.00%
Largest supplier
Concentration Risk
Concentration Risk, Percentage	37.00%	30.00%
Second and third largest suppliers
Concentration Risk
Concentration Risk, Percentage	34.00%	35.00%

Segment and Geographical Area63

Segment and Geographical Area Information, Narrative (Details) - productionfacilities	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information
Percentage of Employees Covered by Collective Bargaining Agreements	63.00%
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year	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	29.00%	25.00%
Customer Concentration Risk | Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage	19.00%		18.00%
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | Fabricated Products
Segment Reporting Information
Concentration Risk, Percentage	10.00%	10.00%
Customer Concentration Risk | Second Largest Customer | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage	16.00%		12.00%
Customer Concentration Risk | Second Largest Customer (number 2) | Accounts Receivable
Segment Reporting Information
Concentration Risk, Percentage			12.00%

Supplemental Cash Flow Inform64

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Supplemental disclosure of cash flow information:
Interest paid	$ 0.3	$ 0.3
Non-cash investing and financing activities (included in Accounts payable):
Stock repurchases not yet settled	2	0.1
Unpaid purchases of property and equipment	3.7	2
Cash and cash equivalents	34.4	70.7	$ 55.2
Restricted cash included in Prepaid expenses and other current assets	0.3	0.3
Restricted cash included in Other assets	12	10.9
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$ 46.7	$ 81.9	$ 67.7	$ 83.7

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ 0	$ 0.1
Realized gain on investments	0.7	0
All other (expense) income, net	(0.1)	0.2
Other income, net	$ 0.6	$ 0.3

Accumulated Other Comprehensi66

Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 804.7
Other comprehensive income, net of tax	1.3
Ending balance	798.6
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(37.1)	$ (31.3)
Reclassification from AOCI, Current Period, Tax	(0.5)	(0.4)
Other comprehensive income, net of tax	0.9	0.8
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	0.9	0.7
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	0	0.1
Ending balance	(36.2)	(30.5)
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
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
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.8	(0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent	1.1	0
Other Comprehensive Income (Loss) before Reclassifications, Tax	(0.4)	0
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0.7	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(0.9)	0
Reclassification from AOCI, Current Period, Tax	0.3	0
Other comprehensive income, net of tax	0.1	0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(0.6)	0
Ending balance	0.9	(0.1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(0.2)	(0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent	0	0
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0	0
Ending balance	(0.2)	(0.1)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income, net of tax	1.3
Ending balance	(35.4)	(30.8)
Foreign Exchange Contract [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(0.1)	(0.2)
OCI, before Reclassifications, before Tax, Attributable to Parent	0	0.2
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	(0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0	0.1
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0.2	0
Reclassification from AOCI, Current Period, Tax	(0.1)	0
Other comprehensive income, net of tax	0.1	0.1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	0.1	0
Ending balance	0	(0.1)
Alloy Metal Hedge [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(0.1)	0
OCI, before Reclassifications, before Tax, Attributable to Parent	0.3	0
Other Comprehensive Income (Loss) before Reclassifications, Tax	(0.1)	0
OCI, before Reclassifications, Net of Tax, Attributable to Parent	0.2	0
Ending balance	$ 0.1	$ 0

Condensed Guarantor and Non-G67

Condensed Guarantor and Non-Guarantor Financial Information, Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 34.4	$ 55.2	$ 70.7
Short-term investments	195.5	231
Receivables:
Trade receivables – net	157	137.7
Intercompany receivables	0	0
Other	11.8	11.9
Inventories	203.5	201.6
Prepaid expenses and other current assets	34	18.5
Total current assets	636.2	655.9
Investments in and advances to subsidiaries	0	0
Property, plant and equipment – net	535.8	530.9
Long-term intercompany loans receivable	0	0
Deferred tax assets – net	140.8	159.7
Intangible assets – net	26	26.4
Goodwill	37.2	37.2
Other assets	37.1	33.4
Total	1,413.1	1,443.5
Current liabilities:
Accounts payable	84.4	75.8
Intercompany loans payable	0	0
Accrued salaries, wages and related expenses	29.1	49.1
Other accrued liabilities	40.4	40.1
Total current liabilities	153.9	165
Net liabilities of Salaried VEBA	28.3	28.6
Deferred tax liabilities	3.3	3.3
Long-term intercompany loans payable	0	0
Long-term liabilities	60.1	73.2
Long-term debt	368.9	368.7
Total liabilities	614.5	638.8
Total stockholders' equity	798.6	804.7
Total	1,413.1	1,443.5
Consolidating Adjustments
Current assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Receivables:
Trade receivables – net	0	0
Intercompany receivables	(86.5)	(86.5)
Other	0	0
Inventories	(4.2)	(3.9)
Prepaid expenses and other current assets	0	(0.5)
Total current assets	(90.7)	(90.9)
Investments in and advances to subsidiaries	(1,099.6)	(1,052.5)
Property, plant and equipment – net	0	0
Long-term intercompany loans receivable	(37.8)	(85.1)
Deferred tax assets – net	4.8	4.8
Intangible assets – net	0	0
Goodwill	0	0
Other assets	0	0
Total	(1,223.3)	(1,223.7)
Current liabilities:
Accounts payable	0	0
Intercompany loans payable	(86.5)	(86.5)
Accrued salaries, wages and related expenses	0	0
Other accrued liabilities	(2.5)	(14.7)
Total current liabilities	(89)	(101.2)
Net liabilities of Salaried VEBA	0	0
Deferred tax liabilities	0	0
Long-term intercompany loans payable	(37.8)	(85.1)
Long-term liabilities	0	0
Long-term debt	0	0
Total liabilities	(126.8)	(186.3)
Total stockholders' equity	(1,096.5)	(1,037.4)
Total	(1,223.3)	(1,223.7)
Parent
Current assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Receivables:
Trade receivables – net	0	0
Intercompany receivables	85.8	85.8
Other	0	0
Inventories	0	0
Prepaid expenses and other current assets	0.1	0.1
Total current assets	85.9	85.9
Investments in and advances to subsidiaries	1,059.1	1,012.4
Property, plant and equipment – net	0	0
Long-term intercompany loans receivable	33.6	80.2
Deferred tax assets – net	0	0
Intangible assets – net	0	0
Goodwill	0	0
Other assets	0	0
Total	1,178.6	1,178.5
Current liabilities:
Accounts payable	2.7	2.2
Intercompany loans payable	0	0
Accrued salaries, wages and related expenses	0	0
Other accrued liabilities	8.4	2.9
Total current liabilities	11.1	5.1
Net liabilities of Salaried VEBA	0	0
Deferred tax liabilities	0	0
Long-term intercompany loans payable	0	0
Long-term liabilities	0	0
Long-term debt	368.9	368.7
Total liabilities	380	373.8
Total stockholders' equity	798.6	804.7
Total	1,178.6	1,178.5
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	29.7	52.9
Short-term investments	195.5	231
Receivables:
Trade receivables – net	151.5	133.1
Intercompany receivables	0.1	0.1
Other	10.9	11.4
Inventories	199.7	197.5
Prepaid expenses and other current assets	33.5	18
Total current assets	620.9	644
Investments in and advances to subsidiaries	40.5	40.1
Property, plant and equipment – net	504.9	499.5
Long-term intercompany loans receivable	0	0
Deferred tax assets – net	136	154.9
Intangible assets – net	26	26.4
Goodwill	37.2	37.2
Other assets	37.1	33.4
Total	1,402.6	1,435.5
Current liabilities:
Accounts payable	76.1	68.9
Intercompany loans payable	86.4	86.4
Accrued salaries, wages and related expenses	27.8	47.2
Other accrued liabilities	34.4	52.6
Total current liabilities	224.7	255.1
Net liabilities of Salaried VEBA	28.3	28.6
Deferred tax liabilities	0	0
Long-term intercompany loans payable	37.8	85.1
Long-term liabilities	57.4	70.5
Long-term debt	0	0
Total liabilities	348.2	439.3
Total stockholders' equity	1,054.4	996.2
Total	1,402.6	1,435.5
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	4.7	2.3
Short-term investments	0	0
Receivables:
Trade receivables – net	5.5	4.6
Intercompany receivables	0.6	0.6
Other	0.9	0.5
Inventories	8	8
Prepaid expenses and other current assets	0.4	0.9
Total current assets	20.1	16.9
Investments in and advances to subsidiaries	0	0
Property, plant and equipment – net	30.9	31.4
Long-term intercompany loans receivable	4.2	4.9
Deferred tax assets – net	0	0
Intangible assets – net	0	0
Goodwill	0	0
Other assets	0	0
Total	55.2	53.2
Current liabilities:
Accounts payable	5.6	4.7
Intercompany loans payable	0.1	0.1
Accrued salaries, wages and related expenses	1.3	1.9
Other accrued liabilities	0.1	(0.7)
Total current liabilities	7.1	6
Net liabilities of Salaried VEBA	0	0
Deferred tax liabilities	3.3	3.3
Long-term intercompany loans payable	0	0
Long-term liabilities	2.7	2.7
Long-term debt	0	0
Total liabilities	13.1	12
Total stockholders' equity	42.1	41.2
Total	$ 55.2	$ 53.2

Condensed Guarantor and Non-G68

Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 355.3	$ 343.2
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	277.8	262
Lower of cost or market inventory write-down	0	4.9
Unrealized gain on derivative instruments	(15.1)	(4)
Depreciation and amortization	9.6	8.7
Selling, general, administrative, research and development	23.7	26.1
Net periodic postretirement benefit cost relating to Salaried VEBA	1.1	0.8
Gain on removal of Union VEBA net assets – Note 5	(1.3)	(0.1)
Total selling, general, administrative, research and development	23.5	26.8
Total costs and expenses	295.8	298.4
Operating income	59.5	44.8
Other (expense) income:
Interest (expense) income	(5.6)	(3.7)
Other income, net	0.6	0.3
Income before income taxes	54.5	41.4
Income tax provision	(18.5)	(15.1)
Earnings in equity of subsidiaries	0	0
Net income	36	26.3
Comprehensive income	37.3	27.2
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(20.8)	(18.9)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	(20.1)	(18.2)
Lower of cost or market inventory write-down		0
Unrealized gain on derivative instruments	0	0
Depreciation and amortization	0	0
Selling, general, administrative, research and development	(0.5)	(0.5)
Net periodic postretirement benefit cost relating to Salaried VEBA	0	0
Gain on removal of Union VEBA net assets – Note 5	0	0
Total selling, general, administrative, research and development	(0.5)	(0.5)
Total costs and expenses	(20.6)	(18.7)
Operating income	(0.2)	(0.2)
Other (expense) income:
Interest (expense) income	0	0
Other income, net	0	0
Income before income taxes	(0.2)	(0.2)
Income tax provision	2.5	2
Earnings in equity of subsidiaries	(43.2)	(31.7)
Net income	(40.9)	(29.9)
Comprehensive income	(42.2)	(30.8)
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0	0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	0	0
Lower of cost or market inventory write-down		0
Unrealized gain on derivative instruments	0	0
Depreciation and amortization	0	0
Selling, general, administrative, research and development	0.9	0.8
Net periodic postretirement benefit cost relating to Salaried VEBA	0	0
Gain on removal of Union VEBA net assets – Note 5	0	0
Total selling, general, administrative, research and development	0.9	0.8
Total costs and expenses	0.9	0.8
Operating income	(0.9)	(0.8)
Other (expense) income:
Interest (expense) income	(5.7)	(4.3)
Other income, net	0	0
Income before income taxes	(6.6)	(5.1)
Income tax provision	0	0
Earnings in equity of subsidiaries	42.6	31.4
Net income	36	26.3
Comprehensive income	37.3	27.2
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	346.8	335.7
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	272.6	257.1
Lower of cost or market inventory write-down		4.9
Unrealized gain on derivative instruments	(15.1)	(4)
Depreciation and amortization	9	8.2
Selling, general, administrative, research and development	20.9	23.6
Net periodic postretirement benefit cost relating to Salaried VEBA	1.1	0.8
Gain on removal of Union VEBA net assets – Note 5	(1.3)	(0.1)
Total selling, general, administrative, research and development	20.7	24.3
Total costs and expenses	287.2	290.5
Operating income	59.6	45.2
Other (expense) income:
Interest (expense) income	0.1	0.6
Other income, net	0.6	0.3
Income before income taxes	60.3	46.1
Income tax provision	(20.8)	(16.9)
Earnings in equity of subsidiaries	0.6	0.3
Net income	40.1	29.5
Comprehensive income	41.4	30.3
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	29.3	26.4
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	25.3	23.1
Lower of cost or market inventory write-down		0
Unrealized gain on derivative instruments	0	0
Depreciation and amortization	0.6	0.5
Selling, general, administrative, research and development	2.4	2.2
Net periodic postretirement benefit cost relating to Salaried VEBA	0	0
Gain on removal of Union VEBA net assets – Note 5	0	0
Total selling, general, administrative, research and development	2.4	2.2
Total costs and expenses	28.3	25.8
Operating income	1	0.6
Other (expense) income:
Interest (expense) income	0	0
Other income, net	0	0
Income before income taxes	1	0.6
Income tax provision	(0.2)	(0.2)
Earnings in equity of subsidiaries	0	0
Net income	0.8	0.4
Comprehensive income	$ 0.8	$ 0.5

Condensed Guarantor and Non-G69

Condensed Guarantor and Non-Guarantor Financial Information, Cash Flow Statements (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net cash (used in) provided by operating activities		$ 4.1	$ 21.3
Cash flows from investing activities
Capital expenditures		(14.8)	(25.9)
Purchase of available for sale securities		(74.7)	0
Proceeds from disposition of available for sale securities		110.9	20
Intercompany loans receivable		0
Net cash provided by (used in) investing activities	[1]	21.4	(5.9)
Cash flows from financing activities
Repayment of capital lease		(0.2)	0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(4.4)	(2.7)
Repurchase of common stock		(32.6)	(6.3)
Cash dividends and dividend equivalents paid		(9.3)	(8.2)
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries			0
Intercompany loan			0
Change in Intercompany Loans Payable		0
Net cash used in financing activities	[1]	(46.5)	(17.2)
Net decrease in cash, cash equivalents and restricted cash during the period		(21)	(1.8)
Cash, cash equivalents and restricted cash at beginning of period		67.7	83.7
Cash, cash equivalents and restricted cash at end of period		46.7	81.9
Consolidating Adjustments
Cash flows from operating activities:
Net cash (used in) provided by operating activities		0	(200)
Cash flows from investing activities
Capital expenditures		0	0
Purchase of available for sale securities		0
Proceeds from disposition of available for sale securities		0	0
Intercompany loans receivable		(47.3)
Net cash provided by (used in) investing activities		(47.3)	0
Cash flows from financing activities
Repayment of capital lease		0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0	0
Repurchase of common stock		0	0
Cash dividends and dividend equivalents paid		0	0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries			(200)
Intercompany loan			0
Change in Intercompany Loans Payable		47.3
Net cash used in financing activities		47.3	200
Net decrease in cash, cash equivalents and restricted cash during the period		0	0
Cash, cash equivalents and restricted cash at beginning of period		0	0
Cash, cash equivalents and restricted cash at end of period		0	0
Parent
Cash flows from operating activities:
Net cash (used in) provided by operating activities		(0.3)	17.2
Cash flows from investing activities
Capital expenditures		0	0
Purchase of available for sale securities		0
Proceeds from disposition of available for sale securities		0	0
Intercompany loans receivable		46.6
Net cash provided by (used in) investing activities		46.6	0
Cash flows from financing activities
Repayment of capital lease		0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(4.4)	(2.7)
Repurchase of common stock		(32.6)	(6.3)
Cash dividends and dividend equivalents paid		(9.3)	(8.2)
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries			0
Intercompany loan			0
Change in Intercompany Loans Payable		0
Net cash used in financing activities		(46.3)	(17.2)
Net decrease in cash, cash equivalents and restricted cash during the period		0	0
Cash, cash equivalents and restricted cash at beginning of period		0	0
Cash, cash equivalents and restricted cash at end of period		0	0
Guarantor Subsidiaries
Cash flows from operating activities:
Net cash (used in) provided by operating activities		2.6	201.4
Cash flows from investing activities
Capital expenditures		(14.7)	(25.3)
Purchase of available for sale securities		(74.7)
Proceeds from disposition of available for sale securities		110.9	20
Intercompany loans receivable		0
Net cash provided by (used in) investing activities		21.5	(5.3)
Cash flows from financing activities
Repayment of capital lease		(0.2)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0	0
Repurchase of common stock		0	0
Cash dividends and dividend equivalents paid		0	0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries			200
Intercompany loan			0.8
Change in Intercompany Loans Payable		(47.3)
Net cash used in financing activities		(47.5)	(199.2)
Net decrease in cash, cash equivalents and restricted cash during the period		(23.4)	(3.1)
Cash, cash equivalents and restricted cash at beginning of period		65.1	83
Cash, cash equivalents and restricted cash at end of period		41.7	79.9
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash (used in) provided by operating activities		1.8	2.7
Cash flows from investing activities
Capital expenditures		(0.1)	(0.6)
Purchase of available for sale securities		0
Proceeds from disposition of available for sale securities		0	0
Intercompany loans receivable		0.7
Net cash provided by (used in) investing activities		0.6	(0.6)
Cash flows from financing activities
Repayment of capital lease		0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		0	0
Repurchase of common stock		0	0
Cash dividends and dividend equivalents paid		0	0
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries			0
Intercompany loan			(0.8)
Change in Intercompany Loans Payable		0
Net cash used in financing activities		0	(0.8)
Net decrease in cash, cash equivalents and restricted cash during the period		2.4	1.3
Cash, cash equivalents and restricted cash at beginning of period		2.6	0.7
Cash, cash equivalents and restricted cash at end of period		$ 5	$ 2
[1]	See Note 11 for the supplemental disclosure on non-cash transactions.

Condensed Guarantor and Non-G70

Condensed Guarantor and Non-Guarantor Financial Information, Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2017	May 15, 2016	May 23, 2012
Condensed Financial Statements, Captions
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$ 0
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%
Guarantor Subsidiaries
Condensed Financial Statements, Captions
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$ (200,000,000)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 17, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent Event [Line Items]
Cash dividends declared (in dollars per share)		$ 0.50	$ 0.45
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 55.7
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared (in dollars per share)	$ 0.5
Cash dividends declared	$ 8.7
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	100
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 148.8