Aleris 10-Q 5 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Mar. 31, 2016shares
Document And Entity Information [Abstract]
Entity Registrant Name	Aleris Corporation
Entity Central Index Key	1,518,587
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding	31,892,441

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 61.9	$ 62.2
Accounts receivable (net of allowances of $8.1 and $7.7 at March 31, 2016 and December 31, 2015, respectively)	278.1	216.2
Inventories	485.5	480.3
Prepaid expenses and other current assets	34.1	28.7
Total Current Assets	859.6	787.4
Property, plant and equipment, net	1,225.8	1,138.7
Intangible assets, net	38.4	38.9
Deferred income taxes	112.6	112.6
Other long-term assets	81.9	82.9
Total Assets	2,318.3	2,160.5
Current Liabilities
Accounts payable	269.4	223.2
Accrued liabilities	210.2	233.8
Current portion of long-term debt	18	8.7
Total Current Liabilities	497.6	465.7
Long-term debt	1,211.9	1,109.6
Deferred income taxes	6	2.5
Accrued pension benefits	152.3	149.1
Accrued postretirement benefits	38	38.8
Other long-term liabilities	67.6	67.6
Total Long-Term Liabilities	1,475.8	1,367.6
Common stock; par value $.01; 45,000,000 shares authorized and 31,892,441 and 31,768,819 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	0.3	0.3
Preferred stock; par value $.01; 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	423	421.9
Retained earnings	81.4	87.7
Accumulated other comprehensive loss	(159.8)	(182.7)
Total Equity	344.9	327.2
Total Liabilities and Equity	$ 2,318.3	$ 2,160.5

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 8.1	$ 7.7
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	31,892,441	31,768,819
Common stock, shares outstanding	31,892,441	31,768,819
Redeemable preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Redeemable preferred stock, shares authorized	1,000,000	1,000,000
Redeemable preferred stock, shares issued	0	0

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 662.5	$ 746.2
Cost of sales	589	689.4
Gross profit	73.5	56.8
Selling, general and administrative expenses	50.3	61.3
Restructuring charges	0.8	2.9
(Gains) losses on derivative financial instruments	(1)	9.1
Other operating expense, net	0.4	1
Operating income (loss)	23	(17.5)
Interest expense, net	18.1	26.6
Other expense (income), net	2.5	(16.2)
Income (loss) from continuing operations before income taxes	2.4	(27.9)
Provision for (benefit from) income taxes	8.7	(2.3)
Loss from continuing operations	(6.3)	(25.6)
Income from discontinued operations, net of tax	0	131.1
Net (loss) income	(6.3)	105.5
Net income from discontinued operations attributable to noncontrolling interest	0	0.1
Net (loss) income attributable to Aleris Corporation	(6.3)	105.4
Comprehensive income	16.6	71.7
Comprehensive income attributable to noncontrolling interest	0	0.1
Comprehensive income attributable to Aleris Corporation	$ 16.6	$ 71.6

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net (loss) income	$ (6.3)	$ 105.5
Depreciation and amortization	26.3	36.6
Provision for deferred income taxes	3.3	78.7
Stock-based compensation expense	1.7	2.7
Unrealized (gains) losses on derivative financial instruments	(9.2)	17.4
Currency exchange gains on debt	(0.4)	(11.3)
Net gain on sale of discontinued operations	0	(205.3)
Other	2	(8.1)
Change in accounts receivable	(55.9)	(161.6)
Change in inventories	5.1	19.7
Change in other assets	4.3	(3.3)
Change in accounts payable	46.1	19.4
Change in accrued liabilities	(5.8)	(10.7)
Net cash provided (used) by operating activities	11.2	(120.3)
Investing activities
Payments for property, plant and equipment	(122)	(65.2)
Proceeds from the sale of businesses, net of cash transferred	0	518
Other	(0.1)	(0.4)
Net cash (used) provided by investing activities	(122.1)	452.4
Financing activities
Proceeds from revolving credit facilities	110	159.5
Payments on revolving credit facilities	(0.2)	(377.6)
Net (payments on) proceeds from other long-term debt	(0.3)	0.9
Debt issuance costs	(0.4)	0
Other	(0.4)	(0.8)
Net cash provided (used) by financing activities	108.7	(218)
Effect of exchange rate differences on cash and cash equivalents	1.9	(4)
Net (decrease) increase in cash and cash equivalents	(0.3)	110.1
Cash and cash equivalents at beginning of the period	62.2	36
Cash and cash equivalents at end of period	61.9	$ 146.1
Cash and cash equivalents of continuing operations	$ 61.9

Basis Of Presentation and Recen

Basis Of Presentation and Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation and Recent Accounting Pronouncements	BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS Basis of Presentation The accompanying unaudited Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The operating results for interim periods contained herein are not necessarily indicative of the results that may be expected for any other interim period or for the full year. The accompanying Consolidated Financial Statements include the accounts of Aleris Corporation and all of its subsidiaries (collectively, except where the context otherwise requires, referred to as “Aleris,” “we,” “us,” “our,” “Company” or similar terms). Aleris Corporation is a holding company and currently conducts its business and operations through its direct wholly owned subsidiary, Aleris International, Inc. and its consolidated subsidiaries. Aleris International, Inc. is referred to herein as “Aleris International.” Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, “Compensation-Stock Compensation-Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). This standard makes several modifications to the accounting for stock-based compensation, including forfeitures, employer tax withholding on stock-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of stock-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, although early adoption is permitted. We are currently assessing how the adoption of this standard will impact the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, “Leases” (“ASU 2016-02”). This guidances requires lessees to put most leases on their balance sheets but recognize expense on the income statement in a manner similar to current guidance. The guidance is effective for fiscal years beginning after December 15, 2018, and a modified retrospective approach is required for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently evaluating the impact the application of ASU No. 2016-02 will have on the Company’s consolidated financial statements. We expect that the adoption will result in an increase to our long-term assets and long-term liabilities as a result of substantially all operating leases existing as of the adoption date being capitalized along with the associated obligations. In April 2015, the FASB issued ASU 2015-03, “Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” This guidance requires that debt issuance costs be presented as a direct reduction to the carrying amount of the related debt in the balance sheet rather than as a deferred charge, consistent with the presentation of discounts on debt. This guidance was adopted in the first quarter of 2016 and applied retrospectively. The adoption of this guidance decreased both “Other long-term assets” and “Long-term debt” by $2.3 and $2.6 at March 31, 2016 and December 31, 2015 , respectively. Other than the current and prior year Consolidated Balance Sheet presentation, the adoption of this new guidance did not have an impact on the Company’s consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU No. 2014-09”), which was the result of a joint project by the FASB and International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP and International Financial Reporting Standards. The issuance of a comprehensive and converged standard on revenue recognition is expected to enable financial statement users to better understand and consistently analyze an entity’s revenue across industries, transactions and geographies. The standard will require additional disclosures to help financial statement users better understand the nature, amount, timing, and potential uncertainty of the revenue that is recognized. In March 2015, the FASB voted to defer the effective date by one year, but allow adoption as of the original adoption date. ASU No. 2014-09 will be effective for the Company on January 1, 2018, and will require either retrospective application to each prior reporting period presented or retrospective application with the cumulative effect of initially applying the standard recognized at the date of adoption. We are evaluating the impact this guidance will have on the Company’s consolidated financial statements and determining which transition method we will use. We expect that the adoption will result in a significant increase to the revenue disclosures in our financial statements.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventories	INVENTORIES The components of our “Inventories” as of March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Raw materials $ 135.3 $ 146.4 Work in process 202.1 176.8 Finished goods 121.7 131.4 Supplies 26.4 25.7 Total inventories $ 485.5 $ 480.3

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	LONG-TERM DEBT Our debt as of March 31, 2016 and December 31, 2015 is summarized as follows: March 31, 2016 December 31, 2015 2015 ABL facility $ 110.0 $ — 7 5/8% Senior Notes due 2018, net of discount and deferred issuance costs of $3.7 and $4.1 at March 31, 2016 and December 31, 2015, respectively 431.3 430.8 7 7/8% Senior Notes due 2020, net of discount and deferred issuance costs of $5.4 and $5.8 at March 31, 2016 and December 31, 2015, respectively 434.7 434.3 Exchangeable notes, net of discount of $0.4 and $0.5 at March 31, 2016 and December 31, 2015, respectively 44.4 44.3 Zhenjiang term loans, net of discount of $0.7 and $0.7 at March 31, 2016 and December 31, 2015, respectively 179.3 178.3 Zhenjiang revolver, net of discount of $0.2 at March 31, 2016 and December 31, 2015 25.5 25.5 Other 4.7 5.1 Total debt 1,229.9 1,118.3 Less: Current portion of long-term debt 18.0 8.7 Total long-term debt $ 1,211.9 $ 1,109.6 9 ½ % Senior Secured Notes due 2021 finalized subsequent to the quarter end On April 4, 2016, Aleris International completed the issuance of $550.0 aggregate principal amount of 9 ½ % Senior Secured Notes due 2021 (the “9 ½ % Senior Secured Notes”) and related guarantees in a private offering under Rule 144A and Regulation S of the Securities Act of 1933, as amended. Net proceeds from the offering were $540.3 , prior to the Tender Offer (as defined below). The 9 ½ % Senior Secured Notes were issued under an Indenture (the “9 ½ % Senior Secured Notes Indenture”), dated as of April 4, 2016, among Aleris International, the guarantors named therein and U.S. Bank National Association, as trustee and collateral agent (the “Collateral Agent”). The 9 ½ % Senior Secured Notes are unconditionally guaranteed by the Company and each domestic subsidiary that guarantees the obligations under the 2015 ABL Facility. The 9 ½ % Senior Secured Notes bear interest at an annual rate of 9 ½ % payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2016. The 9 ½ % Senior Secured Notes will mature on April 1, 2021. Pursuant to a Security Agreement, dated as of April 4, 2016, among Aleris International, the guarantors party thereto and the Collateral Agent, the 9 ½ % Senior Secured Notes are secured by a first-priority lien on substantially all of Aleris International’s and the guarantors’ owned and material U.S. real property, equipment and intellectual property and stock of Aleris International and the guarantors (other than the Company) and other subsidiaries (including 100% of the outstanding non-voting stock (if any) and 65% of the outstanding voting stock of certain “first-tier” foreign subsidiaries and certain “first-tier” foreign subsidiary holding companies) (the “Notes Collateral”), but subject to permitted liens and excluding (i) inventory, accounts receivable, deposit accounts and related assets, which assets secure the 2015 ABL Facility on a first-priority basis (the “ABL Collateral”), (ii) the assets associated with the Lewisport, Kentucky facility and (iii) certain other excluded assets. The 9 ½ % Senior Secured Notes are Aleris International’s senior secured obligations and rank equally with all of Aleris International’s existing and future senior debt, effectively junior to obligations of the issuer under the 2015 ABL Facility to the extent of the value of the ABL Collateral, effectively senior to all of Aleris International’s existing and future indebtedness that is not secured by the Notes Collateral to the extent of the value of the Notes Collateral and senior to all of Aleris International’s existing and future subordinated debt. From and after April 1, 2018, Aleris International may redeem the 2021 Notes, in whole or in part, at a redemption price of 104.8% of the principal amount of the 9 ½ % Senior Secured Notes, plus accrued and unpaid interest, if any, to the redemption date, declining ratably to 100% of the principal amount of the 9 ½ % Senior Secured Notes, plus accrued and unpaid interest, if any, to the redemption date, on or after April 1, 2020. Prior to April 1, 2018, Aleris International may redeem up to 40% of the aggregate principal amount of the 9 ½ % Senior Secured Notes (including any additional 9 ½ % Senior Secured Notes) with funds in an amount equal to all or a portion of the net cash proceeds from certain equity offerings at a redemption price of 109.5% , plus accrued and unpaid interest, if any, to the redemption date. Aleris International may make such redemption so long as, immediately after the occurrence of any such redemption, at least 60% of the aggregate principal amount of the 9 ½ % Senior Secured Notes (including any additional 9 ½ % Senior Secured Notes) remains outstanding and such redemption occurs within 180 days of the closing of the applicable equity offering. Additionally, at any time prior to April 1, 2018, Aleris International may redeem some or all of the 9 ½ % Senior Secured Notes at a redemption price equal to 100% of the principal amount of the 2021 Notes, plus the applicable premium as provided in the 9 ½ % Senior Secured Notes Indenture and accrued and unpaid interest, if any, to the redemption date. If Aleris International experiences a “change of control” specified in the 9 ½ % Senior Secured Notes Indenture, Aleris International must offer to purchase all of the 9 ½ % Senior Secured Notes at a price equal to 101% of the principal amount of the 9 ½ % Senior Secured Notes, plus accrued and unpaid interest, if any, to the date of purchase. In addition, if Aleris International or its restricted subsidiaries engage in certain asset sales or experience certain events of loss with respect to the Notes Collateral and do not invest the cash proceeds from such sales or events of loss or permanently reduce certain debt within a specified period of time, subject to certain exceptions, Aleris International will be required to use a portion of the proceeds of such asset sales or events of loss, as the case may be, to make an offer to purchase a principal amount of the 9 ½ % Senior Secured Notes at a price of 100% of the principal amount of the 9 ½ % Senior Secured Notes, plus accrued and unpaid interest, if any, to (but excluding) the date of purchase. Subject to certain limitations and exceptions, the 9 ½ % Senior Secured Notes Indenture contains covenants limiting the ability of Aleris International and its restricted subsidiaries to, among other things: incur additional debt; pay dividends or distributions on Aleris International capital stock or redeem, repurchase or retire the Aleris International’s capital stock or subordinated debt; issue preferred stock of restricted subsidiaries; make certain investments; create liens on Aleris International’s or its subsidiary guarantors’ assets to secure debt; enter into sale and leaseback transactions; create restrictions on the payment of dividends or other amounts to the Aleris International from Aleris International’s restricted subsidiaries that are not guarantors of the 9 ½ % Senior Secured Notes; enter into transactions with affiliates; merge or consolidate with another company; and sell assets, including capital stock of the Aleris International’s subsidiaries. The 9 ½ % Senior Secured Notes Indenture also contains customary events of default. 7 5/8% Senior Notes due 2018 A portion of the net proceeds from the 9 ½ % Senior Secured Notes were used (i) to complete a cash tender offer (the “Tender Offer”) for any and all of the outstanding $434.9 aggregate principal amount of 7 5 / 8 % Senior Notes due 2018 (the “7 5 / 8 % Senior Notes”), including the payment of related fees and expenses, and (ii) to redeem and discharge any of its outstanding 7 5 / 8 % Senior Notes that were not purchased in the Tender Offer, including the payment of related fees and expenses and any redemption premium. In April 2016, a payment of $281.8 was made to complete the Tender Offer and an additional payment of $167.1 was made to redeem and discharge the remaining principal amounts. Each of these payments included applicable premiums and accrued interest. Subsequent to these payments, all outstanding 7 5 / 8 % Senior Notes were extinguished and a loss on extinguishment of approximately $12.6 will be recorded in the second quarter.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Environmental Proceedings Our operations are subject to federal, state, local and foreign environmental laws and regulations governing air emissions, wastewater discharges, the handling, storage, disposal and remediation of hazardous substances and wastes and employee health and safety. These laws can impose joint and several liability for releases or threatened releases of hazardous substances upon statutorily defined parties, including us, regardless of fault or the lawfulness of the original activity or disposal. Given the changing nature of environmental legal requirements, we may be required, from time to time, to take environmental control measures at some of our facilities to meet future requirements. We have been named as a potentially responsible party in certain proceedings initiated pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act and similar state statutes and may be named a potentially responsible party in other similar proceedings in the future. It is not anticipated that the costs incurred in connection with the presently pending proceedings will, individually or in the aggregate, have a material adverse effect on our financial position, results of operations or cash flows. We are performing operations and maintenance at two Superfund sites for matters arising out of past waste disposal activity associated with closed facilities. We are also under orders to perform environmental remediation by agencies in four states and one non-U.S. country at seven sites. Our reserves for environmental remediation liabilities totaled $26.1 and $26.2 at March 31, 2016 and December 31, 2015 , respectively, and have been classified as “Other long-term liabilities” and “Accrued liabilities” in the Consolidated Balance Sheet. Of the environmental liabilities recorded at March 31, 2016 and December 31, 2015 , $12.7 and $12.8 , respectively, are indemnified. In addition to environmental liabilities, we have recorded asset retirement obligations associated with legal requirements related to the retirement of certain assets. Our total asset retirement obligations were $4.7 and $4.6 at March 31, 2016 and December 31, 2015 , respectively. The amounts represent the most probable costs of remedial actions. We estimate the costs related to currently identified remedial actions will be paid out primarily over the next 10 years . Legal Proceedings We are party to routine litigation and proceedings as part of the ordinary course of business and do not believe that the outcome of any existing proceedings would have a material adverse effect on our financial position, results of operations or cash flows. We have established accruals for those loss contingencies, including litigation and environmental contingencies, for which it has been determined that a loss is probable; none of such loss contingencies is material. For those loss contingencies, including litigation and environmental contingencies, which have been determined to be reasonably possible, an estimate of the possible loss or range of loss cannot be determined because the claims, amount claimed, facts or legal status are not sufficiently developed or advanced in order to make such a determination. While we cannot estimate the loss or range of loss at this time, we do not believe that the outcome of any of these existing proceedings would be material to our financial position, results of operations or cash flows.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Stockholders' Equity and Redeemable Noncontrolling Interest	STOCKHOLDERS ’ EQUITY The following table summarizes the activity within stockholders’ equity for the three months ended March 31, 2016 : Total Equity Total equity at January 1, 2016 $ 327.2 Net loss (6.3 ) Other comprehensive income 22.9 Stock-based compensation activity 1.1 Total equity at March 31, 2016 $ 344.9 The following table shows changes in the number of our outstanding shares of common stock: Outstanding shares of common stock Balance at January 1, 2016 31,768,819 Issuance associated with options exercised 60,094 Issuance associated with vested restricted stock units 63,528 Balance at March 31, 2016 31,892,441

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehesive Income [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table summarizes the activity within accumulated other comprehensive loss for the three months ended March 31, 2016 : Currency translation Pension and other postretirement Total Balance at January 1, 2016 $ (118.7 ) $ (64.0 ) $ (182.7 ) Current period currency translation adjustments 22.8 (0.7 ) 22.1 Amortization of net actuarial losses and prior service costs, net of tax — 0.8 0.8 Balance at March 31, 2016 $ (95.9 ) $ (63.9 ) $ (159.8 ) A summary of reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2016 is provided below: Description of reclassifications out of accumulated other comprehensive loss Amount reclassified Amortization of net actuarial losses and prior service costs $ (0.9 ) (a) Deferred tax benefit on pension and other postretirement liability adjustments 0.1 Losses reclassified into earnings, net of tax $ (0.8 ) (a) This component of accumulated other comprehensive loss is included in the computation of net periodic benefit expense and net postretirement benefit expense (see Note 10, “Employee Benefit Plans,” for additional detail).

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION We report three operating segments based on the organizational structure that is used by the chief operating decision maker to evaluate performance, make decisions on resource allocation and for which discrete financial information is available. The Company’s operating segments are North America, Europe and Asia Pacific. Measurement of Segment Income or Loss and Segment Assets The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies in the Consolidated Financial Statements for the year ended December 31, 2015 . Our measure of profitability for our operating segments is referred to as segment income and loss. Segment income and loss includes gross profits, segment specific realized gains and losses on derivative financial instruments, segment specific other income and expense, segment specific selling, general and administrative (“SG&A”) expense and an allocation of certain functional SG&A expenses. Segment income and loss excludes provisions for and benefits from income taxes, restructuring items, interest, depreciation and amortization, unrealized and certain realized gains and losses on derivative financial instruments, corporate general and administrative costs, start-up costs, gains and losses on asset sales, currency exchange gains and losses on debt and certain other gains and losses. Intra-entity sales and transfers are recorded at market value. Consolidated cash, net capitalized debt costs, deferred tax assets and assets related to our headquarters offices are not allocated to the segments. Reportable Segment Information The following table shows our revenues and segment income (loss) for the periods presented in our Consolidated Statements of Comprehensive Income: Three months ended March 31, 2016 North America Europe Asia Pacific Intra-entity Revenues Total Revenues to external customers $ 333.9 $ 309.1 $ 19.5 $ 662.5 Intra-entity revenues 0.2 3.6 1.8 $ (5.6 ) — Total revenues $ 334.1 $ 312.7 $ 21.3 $ (5.6 ) $ 662.5 Segment income $ 24.2 $ 32.9 $ 0.9 $ 58.0 Three months ended March 31, 2015 North America Europe Asia Pacific Intra-entity Revenues Total Revenues to external customers $ 409.3 $ 317.3 $ 19.6 $ 746.2 Intra-entity revenues 0.5 16.2 1.9 $ (18.6 ) — Total revenues $ 409.8 $ 333.5 $ 21.5 $ (18.6 ) $ 746.2 Segment income (loss) $ 32.0 $ 41.4 $ (1.9 ) $ 71.5 The following table reconciles total segment income to “ Income (loss) from continuing operations before income taxes ” as reported in our Consolidated Statements of Comprehensive Income: For the three months ended March 31, 2016 March 31, 2015 Total segment income $ 58.0 $ 71.5 Unallocated amounts: Depreciation and amortization (26.3 ) (36.6 ) Other corporate general and administrative expenses (13.1 ) (17.9 ) Restructuring charges (0.8 ) (2.9 ) Interest expense, net (18.1 ) (26.6 ) Unallocated gains (losses) on derivative financial instruments 9.2 (19.6 ) Unallocated currency exchange (losses) gains (0.1 ) 10.4 Start-up costs (6.3 ) (3.8 ) Other expense, net (0.1 ) (2.4 ) Income (loss) from continuing operations before income taxes $ 2.4 $ (27.9 ) The following table shows our reportable segment assets as of March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Assets North America $ 1,000.4 $ 882.4 Europe 673.7 632.8 Asia Pacific 392.7 395.9 Unallocated assets 251.5 249.4 Total consolidated assets $ 2,318.3 $ 2,160.5

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION On June 1, 2010, the Board of Directors of Aleris Corporation approved the Aleris Corporation 2010 Equity Incentive Plan, which has been amended from time to time (the “2010 Equity Plan”). Stock options, restricted stock units and restricted shares have been granted under the 2010 Equity Plan to certain members of management of the Company and directors. All stock options granted have a life not to exceed ten years and generally vest over a period not to exceed four years. Shares of common stock are issued upon stock option exercises from available shares. The restricted stock units also vest over a period not to exceed four years. A portion of the stock options, as well as a portion of the restricted stock units, may vest upon a change in control event should the event occur prior to full vesting of these awards, depending on the amount of vesting that has already occurred at the time of the event in comparison to the change in our largest stockholders’ overall level of beneficial ownership that results from the event. During the three months ended March 31, 2016 , no stock options were granted and 34,173 restricted stock units were granted to certain of our directors. In addition, 137,194 stock options and 1,850 restricted stock units were forfeited, primarily due to the departure of a senior executive. We recorded stock-based compensation expense of $1.7 and $2.7 for the three months ended March 31, 2016 and 2015, respectively.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Our effective tax rates were 365.4% and 8.1% for the three months ended March 31, 2016 and 2015, respectively. The effective tax rate for the three months ended March 31, 2016 and 2015 differed from the federal statutory rate applied to income and losses before income taxes primarily as a result of the mix of income, losses and tax rates between tax jurisdictions and valuation allowances. We have valuation allowances recorded to reduce certain deferred tax assets to amounts that are more likely than not to be realized. The valuation allowances relate to the potential inability to realize our deferred tax assets associated with amortization and net operating loss carryforwards in the U.S. and net operating loss carryforwards in non-U.S. jurisdictions. We intend to maintain our valuation allowances until sufficient positive evidence exists (such as cumulative positive earnings and estimated future taxable income) to support their reversal. As of March 31, 2016 , we had $2.4 of unrecognized tax benefits. The majority of the gross unrecognized tax benefits, if recognized, would affect the annual effective tax rate. We recognize interest and penalties related to uncertain tax positions within “Provision for (benefit from) income taxes” in the Consolidated Statements of Comprehensive Income. As of March 31, 2016 , we had approximately $0.5 of accrued interest related to uncertain tax positions. The 2009 through 2015 tax years remain open to examination. During the fourth quarter of 2013, a non-U.S. taxing jurisdiction commenced an examination of our tax returns for the tax years ended December 31, 2012, 2011, 2010 and 2009 that is anticipated to be completed within six months of the reporting date.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS Defined Benefit Pension Plans The components of the net periodic benefit expense are as follows: U.S. pension benefits For the three months ended March 31, 2016 March 31, 2015 Service cost $ 0.9 $ 1.0 Interest cost 1.5 1.8 Amortization of net actuarial losses 0.5 0.5 Amortization of prior service cost 0.1 — Expected return on plan assets (2.5 ) (2.7 ) Net periodic benefit expense $ 0.5 $ 0.6 Non U.S. pension benefits For the three months ended March 31, 2016 March 31, 2015 Service cost $ 0.5 $ 1.0 Interest cost 0.5 1.1 Amortization of net actuarial losses 0.4 1.2 Net periodic benefit expense 1.4 3.3 Net periodic benefit expense reclassified to income from discontinued operations — (1.2 ) Net periodic benefit expense included in continuing operations $ 1.4 $ 2.1 Other Postretirement Benefit Plans The components of net postretirement benefit expense are as follows: For the three months ended March 31, 2016 March 31, 2015 Service cost $ — $ 0.1 Interest cost 0.3 0.4 Amortization of net actuarial losses — 0.1 Net postretirement benefit expense $ 0.3 $ 0.6 Plan Assumptions We are required to make assumptions regarding the discount rate applied to determine service cost and interest cost. Our objective in selecting a discount rate is to select the best estimate of the rate at which the benefit obligation could be effectively settled. In making this estimate, projected cash flows are developed and matched with a yield curve based on an appropriate universe of high-quality corporate bonds. Through the year ended December 31, 2015, we used a single weighted-average discount rate approach to develop the interest and service cost components of the net periodic benefit costs for our pension and other post-retirement plans. This method represented the constant annual rate that would be required to discount all future benefit payments related to past service from the date of expected future payment to the measurement date such that the aggregate present value equals the obligation. We have updated the method previously used for substantially all of our pension plans and our other post-retirement plans. Beginning with our 2016 fiscal year, we have elected to use an approach that discounts the individual expected cash flows underlying interest and service costs using the applicable spot rates derived from the yield curve used to determine the benefit obligation to the relevant projected cash flows. The election and adoption of this method provides a more precise measurement of service and interest costs by improving the correlation between projected benefit cash flows and the corresponding spot yield curve rates. The change in estimate resulted in a decrease in the service cost and interest cost for the three months ended March 31, 2016 of approximately $0.4 , $0.2 and $0.1 for the U.S. pension plans, non-U.S. pension plans and other postretirement benefit plans, respectively.

Derivative And Other Financial

Derivative And Other Financial Instruments	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Other Financial Instruments	DERIVATIVE AND OTHER FINANCIAL INSTRUMENTS We use forward contracts and options, as well as contractual price escalators, to reduce the risks associated with our metal, natural gas and other supply requirements, as well as fuel costs and certain currency exposures. Generally, we enter into master netting arrangements with our counterparties and offset net derivative positions with the same counterparties against amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral under those arrangements in our Consolidated Balance Sheet. For classification purposes, we record the net fair value of each type of derivative position that is expected to settle in less than one year with each counterparty as a net current asset or liability and each type of long-term position as a net long-term asset or liability. Cash collateral of $1.5 and $5.2 was posted at March 31, 2016 and December 31, 2015 , respectively. The amounts shown in the table below represent the gross amounts of recognized assets and liabilities, the amounts offset in the Consolidated Balance Sheet and the net amounts of assets and liabilities presented therein. As of March 31, 2016 and December 31, 2015 , there were no amounts subject to an enforceable master netting arrangement or similar agreement that have not been offset in the Consolidated Balance Sheet. Fair Value of Derivatives as of March 31, 2016 December 31, 2015 Derivatives by Type Asset Liability Asset Liability Metal $ 9.1 $ (23.5 ) $ 5.4 $ (28.4 ) Energy — (1.0 ) 0.1 (0.3 ) Currency 0.2 (0.1 ) — (0.8 ) Total 9.3 (24.6 ) 5.5 (29.5 ) Effect of counterparty netting (8.2 ) 8.2 (5.4 ) 5.4 Effect of cash collateral — 1.5 — 5.2 Net derivatives as classified in the balance sheet $ 1.1 $ (14.9 ) $ 0.1 $ (18.9 ) The fair value of our derivative financial instruments at March 31, 2016 and December 31, 2015 are recorded in the Consolidated Balance Sheet as follows: Asset Derivatives Balance Sheet Location March 31, 2016 December 31, 2015 Metal Prepaid expenses and other current assets $ 0.9 $ — Other long-term assets 0.1 0.1 Currency Prepaid expenses and other current assets 0.1 — Total $ 1.1 $ 0.1 Liability Derivatives Balance Sheet Location March 31, 2016 December 31, 2015 Metal Accrued liabilities $ 12.9 $ 16.6 Other long-term liabilities 1.0 1.3 Energy Accrued liabilities 1.0 0.2 Currency Accrued liabilities — 0.7 Other long-term liabilities — 0.1 Total $ 14.9 $ 18.9 Both realized and unrealized gains and losses on derivative financial instruments are included within “ (Gains) losses on derivative financial instruments ” in the Consolidated Statements of Comprehensive Income. Realized losses (gains) on derivative financial instruments totaled the following: For the three months ended March 31, 2016 March 31, 2015 Metal $ 7.3 $ (11.5 ) Energy 0.6 1.0 Currency 0.3 0.1 Metal Hedging The selling prices of the majority of the orders for our products are established at the time of order entry or, for certain customers, under long-term contracts. As the related raw materials used to produce these orders are purchased several months or years after the selling prices are fixed, margins are subject to the risk of changes in the purchase price of the raw materials used for these fixed price sales. In order to manage this transactional exposure, future, swaps or forward purchase contracts are purchased at the time the selling prices are fixed. As metal is purchased to fill these fixed price sales orders, future, swaps or forward contracts are then sold. We also maintain a significant amount of inventory on-hand to meet anticipated and unpriced future sales. In order to preserve the value of this inventory, future or forward contracts are sold at the time inventory is purchased. As sales orders are priced, future or forward contracts are purchased. These derivatives generally settle within three months. We can also use call option contracts, which function in a manner similar to the natural gas call option contracts discussed below, and put option contracts for managing metal price exposures. Option contracts require the payment of a premium which is recorded as a realized loss upon settlement or expiration of the option contract. Upon settlement of a put option contract, we receive cash and recognize a related gain if the closing price is less than the strike price of the put option. If the put option strike price is less than the closing price, no amount is paid and the option expires. As of March 31, 2016 and December 31, 2015 , we had 0.2 million metric tons and 0.2 million metric tons of metal buy and sell derivative contracts, respectively. Energy Hedging To manage our price exposure for natural gas purchases, we fix the future price of a portion of our natural gas requirements by entering into financial hedge contracts. Under these contracts, payments are made or received based on the differential between the monthly closing price on the New York Mercantile Exchange (“NYMEX”) and the contractual hedge price. We can also use a combination of call option contracts and put option contracts for managing the exposure to increasing natural gas prices while maintaining our ability to benefit from declining prices. Upon settlement of call option contracts, we receive cash and recognize a related gain if the NYMEX closing price exceeds the strike price of the call option. If the call option strike price exceeds the NYMEX closing price, no amount is received and the option expires unexercised. Upon settlement of a put option contract, we pay cash and recognize a related loss if the NYMEX closing price is lower than the strike price of the put option. If the put option strike price is less than the NYMEX closing price, no amount is paid and the option expires unexercised. Option contracts require the payment of a premium which is recorded as a realized loss upon settlement or expiration of the option contract. Natural gas cost can also be managed through the use of cost escalators included in some of our long-term supply contracts with customers, which limits exposure to natural gas price risk. As of March 31, 2016 and December 31, 2015 , we had 2.9 trillion and 4.2 trillion of British thermal unit forward buy contracts, respectively. We use independent freight carriers to deliver our products. As part of the total freight charge, these carriers include a per mile diesel surcharge based on the Department of Energy, Energy Information Administration’s (“DOE”) Weekly Retail Automotive Diesel National Average Price. We have entered into over-the-counter DOE diesel fuel swaps with financial counterparties to mitigate the impact of the volatility of diesel fuel prices on our freight costs. Under these swap agreements, we pay a fixed price per gallon of diesel fuel determined at the time the agreements were executed and receive a floating rate payment that is determined on a monthly basis based on the average price of the DOE Diesel Fuel Index during the applicable month. The swaps are designed to offset increases or decreases in fuel surcharges that we pay to our carriers. All swaps are financially settled. There is no possibility of physical settlement. As of March 31, 2016 we had 2.3 million gallons of diesel swap contracts. We had no diesel swap contracts at December 31, 2015 . Currency Hedging Our aerospace and heat exchanger businesses expose the U.S. dollar operating results of our European operations to fluctuations in the Euro as the sales contracts are generally in U.S. dollars while the costs of production are in Euros. In order to mitigate the risk that fluctuations in the Euro may have on our business, we have entered into forward currency contracts. As of March 31, 2016 and December 31, 2015 , we had Euro forward contracts covering a notional amount of €25.3 million and €18.9 million , respectively. Credit Risk We are exposed to losses in the event of non-performance by the counterparties to the derivative financial instruments discussed above; however, we do not anticipate any non-performance by the counterparties. The counterparties are evaluated for creditworthiness and risk assessment prior to initiating trading activities with the brokers and periodically throughout each year while actively trading. Recurring Fair Value Measurements Derivative contracts are recorded at fair value using quoted market prices and significant other observable inputs. Fair value is defined by Financial Accounting Standards Board Accounting Standards Codification 820, “Fair Value Measurements and Disclosures,” as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (2) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2—Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3—Inputs that are both significant to the fair value measurement and unobservable. We endeavor to use the best available information in measuring fair value. Where appropriate, valuations are adjusted for various factors such as liquidity, bid/offer spreads, and credit considerations. Such adjustments are generally based on available market evidence and unobservable inputs. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. As of March 31, 2016 and December 31, 2015 , all of our derivative assets and liabilities represent Level 2 fair value measurements. Other Financial Instruments The carrying amount, fair values and level in the fair value hierarchy of our other financial instruments at March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Carrying Amount Fair Value Level in the Fair Value Hierarchy Carrying Amount Fair Value Level in the Fair Value Hierarchy Cash and cash equivalents $ 61.9 $ 61.9 Level 1 $ 62.2 $ 62.2 Level 1 Receivables held in escrow 25.5 25.6 Level 2 25.1 25.1 Level 2 2015 ABL facility 110.0 110.0 Level 2 — — Level 2 Exchangeable notes 44.4 63.3 Level 3 44.3 63.3 Level 3 7 5 / 8 % senior notes 431.3 434.5 Level 1 430.8 362.1 Level 1 7 7 / 8 % senior notes 434.7 375.2 Level 1 434.3 336.7 Level 1 Zhenjiang term loans 179.3 180.0 Level 3 178.3 179.0 Level 3 Zhenjiang revolver 25.5 25.7 Level 3 25.5 25.6 Level 3 The receivables held in escrow include shares of Real Industry, Inc.’s Series B non-participating preferred stock. The fair value was estimated using a lattice model based on the expected time to maturity, cash flows of the preferred stock and an estimated yield using available market data. The principal amount of the 2015 ABL facility approximates fair value because the interest rate paid is variable and there have been no significant changes in the credit risk of Aleris International subsequent to the borrowings. The fair value of Aleris International’s exchangeable notes was estimated using a binomial lattice pricing model based on the fair value of our common stock, a risk-free interest rate of 1.1% as of March 31, 2016 and 1.6% as of December 31, 2015 and expected equity volatility of 45% as of March 31, 2016 and December 31, 2015 . Expected equity volatility was determined based on historical stock prices and implied and stated volatilities of our peer companies. The fair values of the Senior Notes were estimated using market quotations. The principal amount of the Zhenjiang term loans and Zhenjiang revolver approximates fair value because the interest rate paid is variable, is set for periods of six months or less and there have been no significant changes in the credit risk of Aleris Zhenjiang subsequent to the inception of the China loan facility.

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS On February 27, 2015, we finalized the sale of our North American and European recycling and specification alloys businesses to Real Industry, Inc. (formerly known as Signature Group Holdings, Inc.) and certain of its affiliates. In addition, on March 1, 2015, we finalized the sale of our extrusions business to Sankyo Tateyama, a Japanese building products and extrusions manufacturer. The operations of the recycling and specification alloys and the extrusions businesses were reported as discontinued operations in the Consolidated Statements of Comprehensive Income for the three months ended March 31, 2015 . The following table reconciles the major line items constituting “Income from discontinued operations, net of tax” presented in the Consolidated Statements of Comprehensive Income: For the three months ended March 31, 2015 Revenues $ 287.7 Cost of sales 270.0 Selling, general and administrative expenses 8.7 Other operating income, net (2.6 ) Operating income from discontinued operations 11.6 Net gain on sale of discontinued operations 205.3 Income from discontinued operations before income taxes 216.9 Provision for income taxes 85.8 Income from discontinued operations, net of tax $ 131.1 The following table provides the capital expenditures and significant operating noncash items of the discontinued operations that are included in the Consolidated Statements of Cash Flows: For the three months ended March 31, 2015 Payments for property, plant and equipment 15.5 Net gain on sale of discontinued operations 205.3 We have entered into contractual arrangements with the disposed entities for the purchase and sale of products in the normal course of business. For the three months ended March 31, 2016 and for the period subsequent to the sales transactions through March 31, 2015 , respectively, we recorded sales to the disposed entities of $15.8 and $10.1 , and purchases from the disposed entities of $4.6 and $2.2 . Such transactions will continue as long as commercially beneficial to the parties involved. In addition, transition services agreements were entered into with each of the disposed entities upon the completion of the transactions. Under these agreements, we continue to provide support services such as information technology, human resources, accounting and other services to the disposed entities. Such services will continue for a period of up to two years, or until the disposed entities no longer have need for such services. For the three months ended March 31, 2016 and for the period subsequent to the sales transactions through March 31, 2015 , respectively, we invoiced $1.6 and $1.0 to the disposed entities under the transition services agreements. This amount is reflected as a reduction of expense in the Consolidated Statements of Comprehensive Income.

Condensed Consolidating Financi

Condensed Consolidating Financial Statements	3 Months Ended
	Mar. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Statements	CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Aleris Corporation, the direct parent of Aleris International, and certain of its subsidiaries (collectively, the “Guarantor Subsidiaries”) are guarantors of the indebtedness under the Senior Notes. Aleris Corporation and each of the Guarantor Subsidiaries have fully and unconditionally guaranteed (subject, in the case of the Guarantor Subsidiaries, to customary release provisions as described below), on a joint and several basis, to pay principal and interest related to the Senior Notes and Aleris International and each of the Guarantor Subsidiaries are directly or indirectly 100% owned subsidiaries of Aleris Corporation. For purposes of complying with the reporting requirements of Aleris International and the Guarantor Subsidiaries, presented below are condensed consolidating financial statements of Aleris Corporation, Aleris International, the Guarantor Subsidiaries, and those other subsidiaries of Aleris Corporation that are not guaranteeing the indebtedness under the Senior Notes (the “Non-Guarantor Subsidiaries”). The condensed consolidating balance sheets are presented as of March 31, 2016 and December 31, 2015 . The condensed consolidating statements of comprehensive income (loss) and the condensed consolidating statements of cash flows are presented for the three months ended March 31, 2016 and 2015 . The guarantee of a Guarantor Subsidiary will be automatically and unconditionally released and discharged in the event of: ▪ any sale of the Guarantor Subsidiary or of all or substantially all of its assets; ▪ a Guarantor Subsidiary being designated as an “unrestricted subsidiary” in accordance with the indentures governing the Senior Notes; ▪ the release or discharge of a Guarantor Subsidiary from its guarantee under the 2015 ABL Facility or other indebtedness that resulted in the obligation of the Guarantor Subsidiary under the indentures governing the Senior Notes; and ▪ the requirements for legal defeasance or covenant defeasance or discharge of the indentures governing the Senior Notes having been satisfied. Upon the completion of the sale of the recycling and specification alloys business on February 27, 2015, the guarantees of the Guarantor Subsidiaries that were sold were automatically and unconditionally released. As of March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ — $ — $ 61.9 $ — $ 61.9 Accounts receivable, net — 0.3 108.8 169.0 — 278.1 Inventories — — 197.1 288.4 — 485.5 Prepaid expenses and other current assets — 3.0 14.2 16.9 — 34.1 Intercompany receivables — 346.3 104.4 16.1 (466.8 ) — Total Current Assets — 349.6 424.5 552.3 (466.8 ) 859.6 Property, plant and equipment, net — — 659.8 566.0 — 1,225.8 Intangible assets, net — — 22.5 15.9 — 38.4 Deferred income taxes — — — 112.6 — 112.6 Other long-term assets — 18.6 5.5 57.8 — 81.9 Investments in subsidiaries 345.8 1,184.1 4.9 — (1,534.8 ) — Total Assets $ 345.8 $ 1,552.3 $ 1,117.2 $ 1,304.6 $ (2,001.6 ) $ 2,318.3 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Accounts payable $ — $ 6.0 $ 135.3 $ 128.1 $ — $ 269.4 Accrued liabilities — 22.3 94.1 93.8 — 210.2 Current portion of long-term debt — — 0.4 17.6 — 18.0 Intercompany payables 0.8 157.9 263.9 44.2 (466.8 ) — Total Current Liabilities 0.8 186.2 493.7 283.7 (466.8 ) 497.6 Long-term debt — 1,020.3 0.4 191.2 — 1,211.9 Deferred income taxes — — 0.2 5.8 — 6.0 Accrued pension benefits — — 49.1 103.2 — 152.3 Accrued postretirement benefits — — 38.0 — — 38.0 Other long-term liabilities — — 36.6 31.0 — 67.6 Total Long-Term Liabilities — 1,020.3 124.3 331.2 — 1,475.8 Total equity 345.0 345.8 499.2 689.7 (1,534.8 ) 344.9 Total Liabilities and Equity $ 345.8 $ 1,552.3 $ 1,117.2 $ 1,304.6 $ (2,001.6 ) $ 2,318.3 As of December 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ — $ — $ 62.2 $ — $ 62.2 Accounts receivable, net — 1.5 73.5 141.2 — 216.2 Inventories — — 191.3 289.0 — 480.3 Prepaid expenses and other current assets — 3.2 14.2 11.3 — 28.7 Intercompany receivables — 152.4 29.1 18.2 (199.7 ) — Total Current Assets — 157.1 308.1 521.9 (199.7 ) 787.4 Property, plant and equipment, net — — 582.6 556.1 — 1,138.7 Intangible assets, net — — 23.0 15.9 — 38.9 Deferred income taxes — — — 112.6 — 112.6 Other long-term assets — 15.6 5.4 61.9 — 82.9 Investments in subsidiaries 327.7 1,175.0 5.0 — (1,507.7 ) — Total Assets $ 327.7 $ 1,347.7 $ 924.1 $ 1,268.4 $ (1,707.4 ) $ 2,160.5 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Accounts payable $ — $ 1.3 $ 102.9 $ 119.0 $ — $ 223.2 Accrued liabilities — 20.8 108.7 104.3 — 233.8 Current portion of long-term debt — — 0.6 8.1 — 8.7 Intercompany payables 0.4 88.5 75.1 35.7 (199.7 ) — Total Current Liabilities 0.4 110.6 287.3 267.1 (199.7 ) 465.7 Long-term debt — 909.4 0.4 199.8 — 1,109.6 Deferred income taxes — — 0.2 2.3 — 2.5 Accrued pension benefits — — 50.5 98.6 — 149.1 Accrued postretirement benefits — — 38.8 — — 38.8 Other long-term liabilities — — 36.5 31.1 — 67.6 Total Long-Term Liabilities — 909.4 126.4 331.8 — 1,367.6 Total equity 327.3 327.7 510.4 669.5 (1,507.7 ) 327.2 Total Liabilities and Equity $ 327.7 $ 1,347.7 $ 924.1 $ 1,268.4 $ (1,707.4 ) $ 2,160.5 For the three months ended March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ — $ 334.1 $ 332.1 $ (3.7 ) $ 662.5 Cost of sales — — 306.7 286.0 (3.7 ) 589.0 Gross profit — — 27.4 46.1 — 73.5 Selling, general and administrative expenses — 1.3 28.6 20.4 — 50.3 Restructuring charges — — 0.3 0.5 — 0.8 Losses (gains) on derivative financial instruments — — 1.7 (2.7 ) — (1.0 ) Other operating expense, net — — 0.3 0.1 — 0.4 Operating (loss) income — (1.3 ) (3.5 ) 27.8 — 23.0 Interest expense, net — — 9.8 8.3 — 18.1 Other (income) expense, net — (3.7 ) (1.2 ) 7.4 — 2.5 Equity in net (earnings) loss of affiliates 6.3 8.7 (0.4 ) — (14.6 ) — (Loss) income before income taxes (6.3 ) (6.3 ) (11.7 ) 12.1 14.6 2.4 (Benefit from) provision for income taxes — — (0.2 ) 8.9 — 8.7 Net (loss) income $ (6.3 ) $ (6.3 ) $ (11.5 ) $ 3.2 $ 14.6 $ (6.3 ) Comprehensive income (loss) $ 16.6 $ 16.6 $ (10.5 ) $ 25.2 $ (31.3 ) $ 16.6 For the three months ended March 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ — $ 407.6 $ 343.0 $ (4.4 ) $ 746.2 Cost of sales — — 378.4 315.4 (4.4 ) 689.4 Gross profit — — 29.2 27.6 — 56.8 Selling, general and administrative expenses — 4.5 30.8 26.0 — 61.3 Restructuring charges — — 2.2 0.7 — 2.9 (Gains) losses on derivative financial instruments — — (1.6 ) 10.7 — 9.1 Other operating expense, net — — 0.9 0.1 — 1.0 Operating loss — (4.5 ) (3.1 ) (9.9 ) — (17.5 ) Interest expense, net — — 22.1 4.5 — 26.6 Other income, net — (0.6 ) (1.0 ) (14.6 ) — (16.2 ) Equity in net (earnings) loss of affiliates (105.4 ) 71.4 (0.7 ) — 34.7 — Income (loss) before income taxes 105.4 (75.3 ) (23.5 ) 0.2 (34.7 ) (27.9 ) (Benefit from) provision for income taxes — — (6.2 ) 3.9 — (2.3 ) Income (loss) from continuing operations 105.4 (75.3 ) (17.3 ) (3.7 ) (34.7 ) (25.6 ) Income (loss) from discontinued operations, net of tax — 180.7 (93.4 ) 43.8 — 131.1 Net income (loss) 105.4 105.4 (110.7 ) 40.1 (34.7 ) 105.5 Net income attributable to noncontrolling interest — — — 0.1 — 0.1 Net income (loss) attributable to Aleris Corporation $ 105.4 $ 105.4 $ (110.7 ) $ 40.0 $ (34.7 ) $ 105.4 Comprehensive income (loss) $ 71.6 $ 71.6 $ (113.1 ) $ 8.7 $ 32.9 $ 71.7 Comprehensive income attributable to noncontrolling interest — — — 0.1 — 0.1 Comprehensive income (loss) attributable to Aleris Corporation $ 71.6 $ 71.6 $ (113.1 ) $ 8.6 $ 32.9 $ 71.6 For the three months ended March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided (used) by operating activities $ 0.4 $ (115.0 ) $ 100.3 $ 26.0 $ (0.5 ) $ 11.2 Investing activities Payments for property, plant and equipment — — (99.7 ) (22.3 ) — (122.0 ) Return of investment in subsidiaries — 5.0 0.1 — (5.1 ) — Other — — — (0.1 ) — (0.1 ) Net cash provided (used) by investing activities — 5.0 (99.6 ) (22.4 ) (5.1 ) (122.1 ) Financing activities Proceeds from the revolving credit facilities — 110.0 — — — 110.0 Payments on the revolving credit facilities — — — (0.2 ) — (0.2 ) Net proceeds from (payments on) other long-term debt — 0.1 (0.3 ) (0.1 ) — (0.3 ) Debt issuance costs — (0.4 ) — — — (0.4 ) Dividends paid (0.3 ) (5.3 ) 5.6 — Other (0.4 ) 0.3 (0.1 ) (0.2 ) — (0.4 ) Net cash (used) provided by financing activities (0.4 ) 110.0 (0.7 ) (5.8 ) 5.6 108.7 Effect of exchange rate differences on cash and cash equivalents — — — 1.9 — 1.9 Net decrease in cash and cash equivalents — — — (0.3 ) — (0.3 ) Cash and cash equivalents at beginning of period — — — 62.2 — 62.2 Cash and cash equivalents at end of period $ — $ — $ — $ 61.9 $ — $ 61.9 For the three months ended March 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided (used) by operating activities $ 0.6 $ 37.1 $ 77.4 $ (37.5 ) $ (197.9 ) $ (120.3 ) Investing activities Payments for property, plant and equipment — — (45.0 ) (20.2 ) — (65.2 ) Proceeds from the sale of businesses, net of cash transferred — 289.9 — 228.1 — 518.0 Disbursements of intercompany loans — (20.4 ) (0.2 ) (20.3 ) 40.9 — Repayments from intercompany loans — 5.4 3.8 34.3 (43.5 ) — Equity contributions in subsidiaries — (137.5 ) (1.1 ) — 138.6 — Return of investments in subsidiaries — 171.3 0.6 — (171.9 ) — Other — (1.1 ) 0.7 — — (0.4 ) Net cash provided (used) by investing activities — 307.6 (41.2 ) 221.9 (35.9 ) 452.4 Financing activities Proceeds from revolving credit facilities — 111.0 — 48.5 — 159.5 Payments on revolving credit facilities — (335.0 ) — (42.6 ) — (377.6 ) Net proceeds from (payments on) other long-term debt — 0.1 (0.1 ) 0.9 — 0.9 Proceeds from intercompany loans — 20.3 — 20.6 (40.9 ) — Repayments on intercompany loans — (34.3 ) — (9.2 ) 43.5 — Proceeds from intercompany equity contributions — — 137.4 1.2 (138.6 ) — Dividends paid — — (173.5 ) (194.0 ) 367.5 — Other (0.6 ) (0.2 ) — — — (0.8 ) Net cash used by financing activities (0.6 ) (238.1 ) (36.2 ) (174.6 ) 231.5 (218.0 ) Effect of exchange rate differences on cash and cash equivalents — — — (4.0 ) — (4.0 ) Net increase in cash and cash equivalents — 106.6 — 5.8 (2.3 ) 110.1 Cash and cash equivalents at beginning of period — — — 36.0 — 36.0 Cash and cash equivalents at end of period $ — $ 106.6 $ — $ 41.8 $ (2.3 ) $ 146.1

Basis Of Presentation and Rec19

Basis Of Presentation and Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.
New Accounting Pronouncements	In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, “Compensation-Stock Compensation-Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). This standard makes several modifications to the accounting for stock-based compensation, including forfeitures, employer tax withholding on stock-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of stock-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, although early adoption is permitted. We are currently assessing how the adoption of this standard will impact the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, “Leases” (“ASU 2016-02”). This guidances requires lessees to put most leases on their balance sheets but recognize expense on the income statement in a manner similar to current guidance. The guidance is effective for fiscal years beginning after December 15, 2018, and a modified retrospective approach is required for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently evaluating the impact the application of ASU No. 2016-02 will have on the Company’s consolidated financial statements. We expect that the adoption will result in an increase to our long-term assets and long-term liabilities as a result of substantially all operating leases existing as of the adoption date being capitalized along with the associated obligations. In April 2015, the FASB issued ASU 2015-03, “Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” This guidance requires that debt issuance costs be presented as a direct reduction to the carrying amount of the related debt in the balance sheet rather than as a deferred charge, consistent with the presentation of discounts on debt. This guidance was adopted in the first quarter of 2016 and applied retrospectively. The adoption of this guidance decreased both “Other long-term assets” and “Long-term debt” by $2.3 and $2.6 at March 31, 2016 and December 31, 2015 , respectively. Other than the current and prior year Consolidated Balance Sheet presentation, the adoption of this new guidance did not have an impact on the Company’s consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU No. 2014-09”), which was the result of a joint project by the FASB and International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP and International Financial Reporting Standards. The issuance of a comprehensive and converged standard on revenue recognition is expected to enable financial statement users to better understand and consistently analyze an entity’s revenue across industries, transactions and geographies. The standard will require additional disclosures to help financial statement users better understand the nature, amount, timing, and potential uncertainty of the revenue that is recognized. In March 2015, the FASB voted to defer the effective date by one year, but allow adoption as of the original adoption date. ASU No. 2014-09 will be effective for the Company on January 1, 2018, and will require either retrospective application to each prior reporting period presented or retrospective application with the cumulative effect of initially applying the standard recognized at the date of adoption. We are evaluating the impact this guidance will have on the Company’s consolidated financial statements and determining which transition method we will use. We expect that the adoption will result in a significant increase to the revenue disclosures in our financial statements.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	The components of our “Inventories” as of March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Raw materials $ 135.3 $ 146.4 Work in process 202.1 176.8 Finished goods 121.7 131.4 Supplies 26.4 25.7 Total inventories $ 485.5 $ 480.3

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of Debt	Our debt as of March 31, 2016 and December 31, 2015 is summarized as follows: March 31, 2016 December 31, 2015 2015 ABL facility $ 110.0 $ — 7 5/8% Senior Notes due 2018, net of discount and deferred issuance costs of $3.7 and $4.1 at March 31, 2016 and December 31, 2015, respectively 431.3 430.8 7 7/8% Senior Notes due 2020, net of discount and deferred issuance costs of $5.4 and $5.8 at March 31, 2016 and December 31, 2015, respectively 434.7 434.3 Exchangeable notes, net of discount of $0.4 and $0.5 at March 31, 2016 and December 31, 2015, respectively 44.4 44.3 Zhenjiang term loans, net of discount of $0.7 and $0.7 at March 31, 2016 and December 31, 2015, respectively 179.3 178.3 Zhenjiang revolver, net of discount of $0.2 at March 31, 2016 and December 31, 2015 25.5 25.5 Other 4.7 5.1 Total debt 1,229.9 1,118.3 Less: Current portion of long-term debt 18.0 8.7 Total long-term debt $ 1,211.9 $ 1,109.6

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Schedule of Stockholders Equity	The following table summarizes the activity within stockholders’ equity for the three months ended March 31, 2016 : Total Equity Total equity at January 1, 2016 $ 327.2 Net loss (6.3 ) Other comprehensive income 22.9 Stock-based compensation activity 1.1 Total equity at March 31, 2016 $ 344.9
Changes in the Number of Outstanding Common Shares	The following table shows changes in the number of our outstanding shares of common stock: Outstanding shares of common stock Balance at January 1, 2016 31,768,819 Issuance associated with options exercised 60,094 Issuance associated with vested restricted stock units 63,528 Balance at March 31, 2016 31,892,441

Accumulated Other Comprehensi23

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehesive Income [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table summarizes the activity within accumulated other comprehensive loss for the three months ended March 31, 2016 : Currency translation Pension and other postretirement Total Balance at January 1, 2016 $ (118.7 ) $ (64.0 ) $ (182.7 ) Current period currency translation adjustments 22.8 (0.7 ) 22.1 Amortization of net actuarial losses and prior service costs, net of tax — 0.8 0.8 Balance at March 31, 2016 $ (95.9 ) $ (63.9 ) $ (159.8 )
Schedule of Amounts Recognized in Other Comprehensive Income	A summary of reclassifications out of accumulated other comprehensive loss for the three months ended March 31, 2016 is provided below: Description of reclassifications out of accumulated other comprehensive loss Amount reclassified Amortization of net actuarial losses and prior service costs $ (0.9 ) (a) Deferred tax benefit on pension and other postretirement liability adjustments 0.1 Losses reclassified into earnings, net of tax $ (0.8 ) (a) This component of accumulated other comprehensive loss is included in the computation of net periodic benefit expense and net postretirement benefit expense (see Note 10, “Employee Benefit Plans,” for additional detail).

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table shows our revenues and segment income (loss) for the periods presented in our Consolidated Statements of Comprehensive Income: Three months ended March 31, 2016 North America Europe Asia Pacific Intra-entity Revenues Total Revenues to external customers $ 333.9 $ 309.1 $ 19.5 $ 662.5 Intra-entity revenues 0.2 3.6 1.8 $ (5.6 ) — Total revenues $ 334.1 $ 312.7 $ 21.3 $ (5.6 ) $ 662.5 Segment income $ 24.2 $ 32.9 $ 0.9 $ 58.0 Three months ended March 31, 2015 North America Europe Asia Pacific Intra-entity Revenues Total Revenues to external customers $ 409.3 $ 317.3 $ 19.6 $ 746.2 Intra-entity revenues 0.5 16.2 1.9 $ (18.6 ) — Total revenues $ 409.8 $ 333.5 $ 21.5 $ (18.6 ) $ 746.2 Segment income (loss) $ 32.0 $ 41.4 $ (1.9 ) $ 71.5
Schedule of Segment Reporting Information, by Segment	The following table reconciles total segment income to “ Income (loss) from continuing operations before income taxes ” as reported in our Consolidated Statements of Comprehensive Income: For the three months ended March 31, 2016 March 31, 2015 Total segment income $ 58.0 $ 71.5 Unallocated amounts: Depreciation and amortization (26.3 ) (36.6 ) Other corporate general and administrative expenses (13.1 ) (17.9 ) Restructuring charges (0.8 ) (2.9 ) Interest expense, net (18.1 ) (26.6 ) Unallocated gains (losses) on derivative financial instruments 9.2 (19.6 ) Unallocated currency exchange (losses) gains (0.1 ) 10.4 Start-up costs (6.3 ) (3.8 ) Other expense, net (0.1 ) (2.4 ) Income (loss) from continuing operations before income taxes $ 2.4 $ (27.9 )
Reconciliation of Assets from Segment to Consolidated	The following table shows our reportable segment assets as of March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 Assets North America $ 1,000.4 $ 882.4 Europe 673.7 632.8 Asia Pacific 392.7 395.9 Unallocated assets 251.5 249.4 Total consolidated assets $ 2,318.3 $ 2,160.5

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
European Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	Non U.S. pension benefits For the three months ended March 31, 2016 March 31, 2015 Service cost $ 0.5 $ 1.0 Interest cost 0.5 1.1 Amortization of net actuarial losses 0.4 1.2 Net periodic benefit expense 1.4 3.3 Net periodic benefit expense reclassified to income from discontinued operations — (1.2 ) Net periodic benefit expense included in continuing operations $ 1.4 $ 2.1
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The components of the net periodic benefit expense are as follows: U.S. pension benefits For the three months ended March 31, 2016 March 31, 2015 Service cost $ 0.9 $ 1.0 Interest cost 1.5 1.8 Amortization of net actuarial losses 0.5 0.5 Amortization of prior service cost 0.1 — Expected return on plan assets (2.5 ) (2.7 ) Net periodic benefit expense $ 0.5 $ 0.6
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The components of net postretirement benefit expense are as follows: For the three months ended March 31, 2016 March 31, 2015 Service cost $ — $ 0.1 Interest cost 0.3 0.4 Amortization of net actuarial losses — 0.1 Net postretirement benefit expense $ 0.3 $ 0.6

Derivative And Other Financia26

Derivative And Other Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The amounts shown in the table below represent the gross amounts of recognized assets and liabilities, the amounts offset in the Consolidated Balance Sheet and the net amounts of assets and liabilities presented therein. As of March 31, 2016 and December 31, 2015 , there were no amounts subject to an enforceable master netting arrangement or similar agreement that have not been offset in the Consolidated Balance Sheet. Fair Value of Derivatives as of March 31, 2016 December 31, 2015 Derivatives by Type Asset Liability Asset Liability Metal $ 9.1 $ (23.5 ) $ 5.4 $ (28.4 ) Energy — (1.0 ) 0.1 (0.3 ) Currency 0.2 (0.1 ) — (0.8 ) Total 9.3 (24.6 ) 5.5 (29.5 ) Effect of counterparty netting (8.2 ) 8.2 (5.4 ) 5.4 Effect of cash collateral — 1.5 — 5.2 Net derivatives as classified in the balance sheet $ 1.1 $ (14.9 ) $ 0.1 $ (18.9 )
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The fair value of our derivative financial instruments at March 31, 2016 and December 31, 2015 are recorded in the Consolidated Balance Sheet as follows: Asset Derivatives Balance Sheet Location March 31, 2016 December 31, 2015 Metal Prepaid expenses and other current assets $ 0.9 $ — Other long-term assets 0.1 0.1 Currency Prepaid expenses and other current assets 0.1 — Total $ 1.1 $ 0.1 Liability Derivatives Balance Sheet Location March 31, 2016 December 31, 2015 Metal Accrued liabilities $ 12.9 $ 16.6 Other long-term liabilities 1.0 1.3 Energy Accrued liabilities 1.0 0.2 Currency Accrued liabilities — 0.7 Other long-term liabilities — 0.1 Total $ 14.9 $ 18.9
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	Realized losses (gains) on derivative financial instruments totaled the following: For the three months ended March 31, 2016 March 31, 2015 Metal $ 7.3 $ (11.5 ) Energy 0.6 1.0 Currency 0.3 0.1
Schedule of Fair Value Measurements, Nonrecurring	The carrying amount, fair values and level in the fair value hierarchy of our other financial instruments at March 31, 2016 and December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Carrying Amount Fair Value Level in the Fair Value Hierarchy Carrying Amount Fair Value Level in the Fair Value Hierarchy Cash and cash equivalents $ 61.9 $ 61.9 Level 1 $ 62.2 $ 62.2 Level 1 Receivables held in escrow 25.5 25.6 Level 2 25.1 25.1 Level 2 2015 ABL facility 110.0 110.0 Level 2 — — Level 2 Exchangeable notes 44.4 63.3 Level 3 44.3 63.3 Level 3 7 5 / 8 % senior notes 431.3 434.5 Level 1 430.8 362.1 Level 1 7 7 / 8 % senior notes 434.7 375.2 Level 1 434.3 336.7 Level 1 Zhenjiang term loans 179.3 180.0 Level 3 178.3 179.0 Level 3 Zhenjiang revolver 25.5 25.7 Level 3 25.5 25.6 Level 3

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Discontinued Operations	The following table provides the capital expenditures and significant operating noncash items of the discontinued operations that are included in the Consolidated Statements of Cash Flows: For the three months ended March 31, 2015 Payments for property, plant and equipment 15.5 Net gain on sale of discontinued operations 205.3	The following table reconciles the major line items constituting “Income from discontinued operations, net of tax” presented in the Consolidated Statements of Comprehensive Income: For the three months ended March 31, 2015 Revenues $ 287.7 Cost of sales 270.0 Selling, general and administrative expenses 8.7 Other operating income, net (2.6 ) Operating income from discontinued operations 11.6 Net gain on sale of discontinued operations 205.3 Income from discontinued operations before income taxes 216.9 Provision for income taxes 85.8 Income from discontinued operations, net of tax $ 131.1

Condensed Consolidating Finan28

Condensed Consolidating Financial Statements (Tables)	3 Months Ended
	Mar. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheet	As of March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ — $ — $ 61.9 $ — $ 61.9 Accounts receivable, net — 0.3 108.8 169.0 — 278.1 Inventories — — 197.1 288.4 — 485.5 Prepaid expenses and other current assets — 3.0 14.2 16.9 — 34.1 Intercompany receivables — 346.3 104.4 16.1 (466.8 ) — Total Current Assets — 349.6 424.5 552.3 (466.8 ) 859.6 Property, plant and equipment, net — — 659.8 566.0 — 1,225.8 Intangible assets, net — — 22.5 15.9 — 38.4 Deferred income taxes — — — 112.6 — 112.6 Other long-term assets — 18.6 5.5 57.8 — 81.9 Investments in subsidiaries 345.8 1,184.1 4.9 — (1,534.8 ) — Total Assets $ 345.8 $ 1,552.3 $ 1,117.2 $ 1,304.6 $ (2,001.6 ) $ 2,318.3 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Accounts payable $ — $ 6.0 $ 135.3 $ 128.1 $ — $ 269.4 Accrued liabilities — 22.3 94.1 93.8 — 210.2 Current portion of long-term debt — — 0.4 17.6 — 18.0 Intercompany payables 0.8 157.9 263.9 44.2 (466.8 ) — Total Current Liabilities 0.8 186.2 493.7 283.7 (466.8 ) 497.6 Long-term debt — 1,020.3 0.4 191.2 — 1,211.9 Deferred income taxes — — 0.2 5.8 — 6.0 Accrued pension benefits — — 49.1 103.2 — 152.3 Accrued postretirement benefits — — 38.0 — — 38.0 Other long-term liabilities — — 36.6 31.0 — 67.6 Total Long-Term Liabilities — 1,020.3 124.3 331.2 — 1,475.8 Total equity 345.0 345.8 499.2 689.7 (1,534.8 ) 344.9 Total Liabilities and Equity $ 345.8 $ 1,552.3 $ 1,117.2 $ 1,304.6 $ (2,001.6 ) $ 2,318.3 As of December 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated ASSETS Current Assets Cash and cash equivalents $ — $ — $ — $ 62.2 $ — $ 62.2 Accounts receivable, net — 1.5 73.5 141.2 — 216.2 Inventories — — 191.3 289.0 — 480.3 Prepaid expenses and other current assets — 3.2 14.2 11.3 — 28.7 Intercompany receivables — 152.4 29.1 18.2 (199.7 ) — Total Current Assets — 157.1 308.1 521.9 (199.7 ) 787.4 Property, plant and equipment, net — — 582.6 556.1 — 1,138.7 Intangible assets, net — — 23.0 15.9 — 38.9 Deferred income taxes — — — 112.6 — 112.6 Other long-term assets — 15.6 5.4 61.9 — 82.9 Investments in subsidiaries 327.7 1,175.0 5.0 — (1,507.7 ) — Total Assets $ 327.7 $ 1,347.7 $ 924.1 $ 1,268.4 $ (1,707.4 ) $ 2,160.5 LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Accounts payable $ — $ 1.3 $ 102.9 $ 119.0 $ — $ 223.2 Accrued liabilities — 20.8 108.7 104.3 — 233.8 Current portion of long-term debt — — 0.6 8.1 — 8.7 Intercompany payables 0.4 88.5 75.1 35.7 (199.7 ) — Total Current Liabilities 0.4 110.6 287.3 267.1 (199.7 ) 465.7 Long-term debt — 909.4 0.4 199.8 — 1,109.6 Deferred income taxes — — 0.2 2.3 — 2.5 Accrued pension benefits — — 50.5 98.6 — 149.1 Accrued postretirement benefits — — 38.8 — — 38.8 Other long-term liabilities — — 36.5 31.1 — 67.6 Total Long-Term Liabilities — 909.4 126.4 331.8 — 1,367.6 Total equity 327.3 327.7 510.4 669.5 (1,507.7 ) 327.2 Total Liabilities and Equity $ 327.7 $ 1,347.7 $ 924.1 $ 1,268.4 $ (1,707.4 ) $ 2,160.5
Schedule of Condensed Income Statement	For the three months ended March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ — $ 334.1 $ 332.1 $ (3.7 ) $ 662.5 Cost of sales — — 306.7 286.0 (3.7 ) 589.0 Gross profit — — 27.4 46.1 — 73.5 Selling, general and administrative expenses — 1.3 28.6 20.4 — 50.3 Restructuring charges — — 0.3 0.5 — 0.8 Losses (gains) on derivative financial instruments — — 1.7 (2.7 ) — (1.0 ) Other operating expense, net — — 0.3 0.1 — 0.4 Operating (loss) income — (1.3 ) (3.5 ) 27.8 — 23.0 Interest expense, net — — 9.8 8.3 — 18.1 Other (income) expense, net — (3.7 ) (1.2 ) 7.4 — 2.5 Equity in net (earnings) loss of affiliates 6.3 8.7 (0.4 ) — (14.6 ) — (Loss) income before income taxes (6.3 ) (6.3 ) (11.7 ) 12.1 14.6 2.4 (Benefit from) provision for income taxes — — (0.2 ) 8.9 — 8.7 Net (loss) income $ (6.3 ) $ (6.3 ) $ (11.5 ) $ 3.2 $ 14.6 $ (6.3 ) Comprehensive income (loss) $ 16.6 $ 16.6 $ (10.5 ) $ 25.2 $ (31.3 ) $ 16.6 For the three months ended March 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenues $ — $ — $ 407.6 $ 343.0 $ (4.4 ) $ 746.2 Cost of sales — — 378.4 315.4 (4.4 ) 689.4 Gross profit — — 29.2 27.6 — 56.8 Selling, general and administrative expenses — 4.5 30.8 26.0 — 61.3 Restructuring charges — — 2.2 0.7 — 2.9 (Gains) losses on derivative financial instruments — — (1.6 ) 10.7 — 9.1 Other operating expense, net — — 0.9 0.1 — 1.0 Operating loss — (4.5 ) (3.1 ) (9.9 ) — (17.5 ) Interest expense, net — — 22.1 4.5 — 26.6 Other income, net — (0.6 ) (1.0 ) (14.6 ) — (16.2 ) Equity in net (earnings) loss of affiliates (105.4 ) 71.4 (0.7 ) — 34.7 — Income (loss) before income taxes 105.4 (75.3 ) (23.5 ) 0.2 (34.7 ) (27.9 ) (Benefit from) provision for income taxes — — (6.2 ) 3.9 — (2.3 ) Income (loss) from continuing operations 105.4 (75.3 ) (17.3 ) (3.7 ) (34.7 ) (25.6 ) Income (loss) from discontinued operations, net of tax — 180.7 (93.4 ) 43.8 — 131.1 Net income (loss) 105.4 105.4 (110.7 ) 40.1 (34.7 ) 105.5 Net income attributable to noncontrolling interest — — — 0.1 — 0.1 Net income (loss) attributable to Aleris Corporation $ 105.4 $ 105.4 $ (110.7 ) $ 40.0 $ (34.7 ) $ 105.4 Comprehensive income (loss) $ 71.6 $ 71.6 $ (113.1 ) $ 8.7 $ 32.9 $ 71.7 Comprehensive income attributable to noncontrolling interest — — — 0.1 — 0.1 Comprehensive income (loss) attributable to Aleris Corporation $ 71.6 $ 71.6 $ (113.1 ) $ 8.6 $ 32.9 $ 71.6
Schedule of Condensed Cash Flow Statement	For the three months ended March 31, 2016 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided (used) by operating activities $ 0.4 $ (115.0 ) $ 100.3 $ 26.0 $ (0.5 ) $ 11.2 Investing activities Payments for property, plant and equipment — — (99.7 ) (22.3 ) — (122.0 ) Return of investment in subsidiaries — 5.0 0.1 — (5.1 ) — Other — — — (0.1 ) — (0.1 ) Net cash provided (used) by investing activities — 5.0 (99.6 ) (22.4 ) (5.1 ) (122.1 ) Financing activities Proceeds from the revolving credit facilities — 110.0 — — — 110.0 Payments on the revolving credit facilities — — — (0.2 ) — (0.2 ) Net proceeds from (payments on) other long-term debt — 0.1 (0.3 ) (0.1 ) — (0.3 ) Debt issuance costs — (0.4 ) — — — (0.4 ) Dividends paid (0.3 ) (5.3 ) 5.6 — Other (0.4 ) 0.3 (0.1 ) (0.2 ) — (0.4 ) Net cash (used) provided by financing activities (0.4 ) 110.0 (0.7 ) (5.8 ) 5.6 108.7 Effect of exchange rate differences on cash and cash equivalents — — — 1.9 — 1.9 Net decrease in cash and cash equivalents — — — (0.3 ) — (0.3 ) Cash and cash equivalents at beginning of period — — — 62.2 — 62.2 Cash and cash equivalents at end of period $ — $ — $ — $ 61.9 $ — $ 61.9 For the three months ended March 31, 2015 Aleris Corporation (Parent) Aleris International, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided (used) by operating activities $ 0.6 $ 37.1 $ 77.4 $ (37.5 ) $ (197.9 ) $ (120.3 ) Investing activities Payments for property, plant and equipment — — (45.0 ) (20.2 ) — (65.2 ) Proceeds from the sale of businesses, net of cash transferred — 289.9 — 228.1 — 518.0 Disbursements of intercompany loans — (20.4 ) (0.2 ) (20.3 ) 40.9 — Repayments from intercompany loans — 5.4 3.8 34.3 (43.5 ) — Equity contributions in subsidiaries — (137.5 ) (1.1 ) — 138.6 — Return of investments in subsidiaries — 171.3 0.6 — (171.9 ) — Other — (1.1 ) 0.7 — — (0.4 ) Net cash provided (used) by investing activities — 307.6 (41.2 ) 221.9 (35.9 ) 452.4 Financing activities Proceeds from revolving credit facilities — 111.0 — 48.5 — 159.5 Payments on revolving credit facilities — (335.0 ) — (42.6 ) — (377.6 ) Net proceeds from (payments on) other long-term debt — 0.1 (0.1 ) 0.9 — 0.9 Proceeds from intercompany loans — 20.3 — 20.6 (40.9 ) — Repayments on intercompany loans — (34.3 ) — (9.2 ) 43.5 — Proceeds from intercompany equity contributions — — 137.4 1.2 (138.6 ) — Dividends paid — — (173.5 ) (194.0 ) 367.5 — Other (0.6 ) (0.2 ) — — — (0.8 ) Net cash used by financing activities (0.6 ) (238.1 ) (36.2 ) (174.6 ) 231.5 (218.0 ) Effect of exchange rate differences on cash and cash equivalents — — — (4.0 ) — (4.0 ) Net increase in cash and cash equivalents — 106.6 — 5.8 (2.3 ) 110.1 Cash and cash equivalents at beginning of period — — — 36.0 — 36.0 Cash and cash equivalents at end of period $ — $ 106.6 $ — $ 41.8 $ (2.3 ) $ 146.1

Basis Of Presentation and Rec29

Basis Of Presentation and Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Deferred Finance Costs, Net	$ (2.3)
Accounting Standards Update 2015-03 | Long-term debt
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Deferred Finance Costs, Net		$ (2.6)

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 135.3	$ 146.4
Work in process	202.1	176.8
Finished goods	121.7	131.4
Supplies	26.4	25.7
Total inventories	$ 485.5	$ 480.3

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 1,229.9	$ 1,118.3
Less: Current portion of long-term debt	18	8.7
Total long-term debt	1,211.9	1,109.6
Line of Credit | ABL Facility
Debt Instrument [Line Items]
Total debt	110	0
Senior Notes | 7 5/8% Senior Notes
Debt Instrument [Line Items]
Total debt	431.3	430.8
Debt discount	$ 3.7	4.1
Stated interest rate	7.625%
Senior Notes | 7 7/8% Senior Notes
Debt Instrument [Line Items]
Total debt	$ 434.7	434.3
Debt discount	$ 5.4	5.8
Stated interest rate	7.875%
Senior Subordinated Notes | Senior Subordinated Exchangeable Notes
Debt Instrument [Line Items]
Total debt	$ 44.4	44.3
Debt discount	0.4	0.5
Notes Payable to Banks | Zhenjiang term loans
Debt Instrument [Line Items]
Total debt	179.3	178.3
Debt discount	0.7	0.7
Foreign Line of Credit | Zhenjiang revolver
Debt Instrument [Line Items]
Total debt	25.5	25.5
Debt discount	0.2	0.2
Other Long-term Debt
Debt Instrument [Line Items]
Total debt	$ 4.7	$ 5.1

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	Apr. 04, 2016	Apr. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Senior Notes | 9 1/2% Senior Notes
Debt Instrument [Line Items]
Redemption price upon change in control				101.00%
Senior Notes | 7 5/8% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				7.625%
Long-term debt, gross				$ 434,900,000
Subsequent Event
Debt Instrument [Line Items]
Losses on extinguishment of debt			$ 12,600,000
Subsequent Event | Senior Notes | 9 1/2% Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 550,000,000
Net proceeds from debt offering	$ 540,300,000
Stated interest rate	9.50%
Debt instrument, collateral, percent of outstanding non-voting stock	$ 1
Debt instrument, collateral, percent of outstanding voting stock of certain foreign subsidiaries	$ 0.65
Subsequent Event | Senior Notes | 7 5/8% Senior Notes
Debt Instrument [Line Items]
Payments to complete tender offer		$ 281,800,000
Payment to redeem and discharge debt		$ 167,100,000
Period From and After April 1, 2018 | Senior Notes | 9 1/2% Senior Notes | Minimum
Debt Instrument [Line Items]
Debt instrument, redemption price				100.00%
Period From and After April 1, 2018 | Senior Notes | 9 1/2% Senior Notes | Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price				104.80%
Period Prior to April 1, 2018 | Senior Notes | 9 1/2% Senior Notes
Debt Instrument [Line Items]
Early redemption percentage				40.00%
Early redemption, aggregate principal percentage required to remain				60.00%
Debt instrument, redemption period within closing offering				180 days
Period Prior to April 1, 2018 | Senior Notes | 9 1/2% Senior Notes | Minimum
Debt Instrument [Line Items]
Debt instrument, redemption price				100.00%
Period Prior to April 1, 2018 | Senior Notes | 9 1/2% Senior Notes | Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price				109.50%

Commitments And Contingencies (

Commitments And Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)Foreign_CountriesStatesSite	Dec. 31, 2015USD ($)
Loss Contingencies [Line Items]
Number of Superfund sites with operations and maintenance | Site	2
Number of states in which company performs environmental remediation | States	4
Number of foreign countries with environmental remediations | Foreign_Countries	1
Number of Sites with Environmental Remediations | Site	7
Portion of environmental liabilities indemnified by Corus Group Ltd.	$ 12.7	$ 12.8
Asset retirement obligations	$ 4.7	4.6
Estimated time frame of disbursements	10 years
Other Long-Term Liabilities and Accrued Liabilities
Loss Contingencies [Line Items]
Reserves for environmental remediation liabilities	$ 26.1	$ 26.2

Stockholders' Equity (Schedule

Stockholders' Equity (Schedule of Stockholders' Equity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity Disclosure [Roll Forward]
Total Equity at beginning of period	$ 327.2
Net income attributable to Aleris Corporation	(6.3)	$ 105.4
Total Equity at end of period	344.9
Aleris Corporation
Increase (Decrease) in Stockholders' Equity Disclosure [Roll Forward]
Total Equity at beginning of period	327.2
Net income attributable to Aleris Corporation	(6.3)
Other comprehensive income	22.9
Stock-based compensation activity	1.1
Total Equity at end of period	$ 344.9

Stockholders' Equity (Changes i

Stockholders' Equity (Changes in the Number of Outstanding Common Stock) (Details)	3 Months Ended
	Mar. 31, 2016shares
Outstanding Shares of Common Stock [Roll Forward]
Balance at January 1, 2016	31,768,819
Balance at March 31, 2016	31,892,441
Stock Options
Outstanding Shares of Common Stock [Roll Forward]
Issuance associated with units exercised or vested	60,094
Restricted Stock
Outstanding Shares of Common Stock [Roll Forward]
Issuance associated with units exercised or vested	63,528

Accumulated Other Comprehensi36

Accumulated Other Comprehensive Loss (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Accumulated Other Comprehensive Income [Roll Forward]
Balance at January 1, 2016	$ (182.7)
Current period currency translation adjustments	22.1
Amortization of net actuarial losses and prior service costs, net of tax	0.8
Balance at March 31, 2016	(159.8)
Currency translation
Accumulated Other Comprehensive Income [Roll Forward]
Balance at January 1, 2016	(118.7)
Current period currency translation adjustments	22.8
Amortization of net actuarial losses and prior service costs, net of tax	0
Balance at March 31, 2016	(95.9)
Pension and other postretirement
Accumulated Other Comprehensive Income [Roll Forward]
Balance at January 1, 2016	(64)
Current period currency translation adjustments	(0.7)
Amortization of net actuarial losses and prior service costs, net of tax	0.8
Balance at March 31, 2016	(63.9)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amortization of net actuarial losses and prior service costs	(0.9)
Deferred tax benefit on pension and other postretirement liability adjustments	0.1
Losses reclassified into earnings, net of tax	$ (0.8)

Segment Information (Schedule o

Segment Information (Schedule of Revenues and Segment Income) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)Operating_Segment	Mar. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segment	3
Revenue for Reportable Segments
Revenues	$ 662.5	$ 746.2
Segment income	58	71.5
External Customers
Revenue for Reportable Segments
Revenues	662.5	746.2
Operating segments | North America
Revenue for Reportable Segments
Revenues	334.1	409.8
Segment income	24.2	32
Operating segments | Europe
Revenue for Reportable Segments
Revenues	312.7	333.5
Segment income	32.9	41.4
Operating segments | Asia Pacific
Revenue for Reportable Segments
Revenues	21.3	21.5
Segment income	0.9	(1.9)
Operating segments | External Customers | North America
Revenue for Reportable Segments
Revenues	333.9	409.3
Operating segments | External Customers | Europe
Revenue for Reportable Segments
Revenues	309.1	317.3
Operating segments | External Customers | Asia Pacific
Revenue for Reportable Segments
Revenues	19.5	19.6
Operating segments | Intra-entity Eliminations | North America
Revenue for Reportable Segments
Revenues	0.2	0.5
Operating segments | Intra-entity Eliminations | Europe
Revenue for Reportable Segments
Revenues	3.6	16.2
Operating segments | Intra-entity Eliminations | Asia Pacific
Revenue for Reportable Segments
Revenues	1.8	1.9
Intra-entity Eliminations
Revenue for Reportable Segments
Revenues	(5.6)	(18.6)
Intra-entity Eliminations | Intra-entity Eliminations
Revenue for Reportable Segments
Revenues	$ 0	$ 0

Segment Information (Reconcilia

Segment Information (Reconciliation of Segment Income to Consolidated Statements of Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Loss from continuing operations attributable to Aleris Corporation	$ (6.3)	$ 105.4
Depreciation and amortization	(26.3)	(36.6)
Restructuring charges	(0.8)	(2.9)
Interest expense, net	(18.1)	(26.6)
Unallocated gains (losses) on derivative financial instruments	1	(9.1)
Income (loss) from continuing operations before income taxes	2.4	(27.9)
Operating segments
Segment Reporting Information [Line Items]
Loss from continuing operations attributable to Aleris Corporation	58	71.5
Operating segments | Unallocated Amounts
Segment Reporting Information [Line Items]
Depreciation and amortization	(26.3)	(36.6)
Other corporate general and administrative expenses	13.1	(17.9)
Restructuring charges	(0.8)	(2.9)
Interest expense, net	(18.1)	(26.6)
Unallocated gains (losses) on derivative financial instruments	9.2	(19.6)
Unallocated currency exchange (losses) gains	(0.1)	10.4
Start-up costs	(6.3)	(3.8)
Other expense, net	$ 0.1	$ (2.4)

Segment Information (Reconcil39

Segment Information (Reconciliation of Reportable Segment Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,318.3	$ 2,160.5
Operating segments | North America
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,000.4	882.4
Operating segments | Europe
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	673.7	632.8
Operating segments | Asia Pacific
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	392.7	395.9
Operating segments | Unallocated Amounts
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 251.5	$ 249.4

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of award (in years)	10 years
Award vesting period (in years)	4 years
Stock options granted (in shares)	0
Stock options forfeited (in shares)	137,194
Stock-based compensation expense	$ 1.7	$ 2.7
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares)	34,173
Restricted stock units forfeited (in shares)	1,850

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	365.40%	8.10%
Unrecognized tax benefits	$ 2.4
Accrued interest related to uncertain tax positions	$ 0.5

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Document Period End Date	Mar. 31, 2016
Amortization of net actuarial losses (gains)	$ (0.8)
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Service and Interest Cost	0.4
Service cost	0.9	$ 1
Interest cost	1.5	1.8
Amortization of net actuarial losses (gains)	0.5	0.5
Amortization of prior service cost	0.1	0
Expected return on plan assets	(2.5)	(2.7)
Net periodic benefit expense	0.5	0.6
European Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Service and Interest Cost	0.2
Service cost	0.5	1
Interest cost	0.5	1.1
Amortization of net actuarial losses (gains)	0.4	1.2
Net periodic benefit expense	1.4	3.3
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Service and Interest Cost	0.1
Service cost	0	0.1
Interest cost	0.3	0.4
Amortization of net actuarial losses (gains)	0	0.1
Net periodic benefit expense	0.3	0.6
Discontinued Operations | European Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit expense	0	(1.2)
Continuing Operations | European Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit expense	$ 1.4	$ 2.1

Derivative And Other Financia43

Derivative And Other Financial Instruments (Narratives) (Details) gal in Millions, T in Millions, $ in Millions, BTU in Trillions	3 Months Ended		12 Months Ended
	Mar. 31, 2016EUR (€)BTUgalT	Mar. 31, 2015T	Dec. 31, 2015EUR (€)BTUgalT	Mar. 31, 2016USD ($)BTUgalT	Dec. 31, 2015USD ($)BTUgalT
Derivative [Line Items]
Cash collateral posted | $				$ 1.5	$ 5.2
Metal
Derivative [Line Items]
Maximum settlement period of derivatives (in months)	3 months
Tons of metal in forward contracts with the right to buy (in tons)	0.2	0.2		0.2
Tons of metal in forward contracts with the right to sell (in tons)		0.2	0.2		0.2
Energy Related Derivative
Derivative [Line Items]
British thermal units in forward buy contracts (in British thermal units) | BTU	2.9		4.2	2.9	4.2
Gallons in diesel swap contracts (in gallons) | gal	2.3		0	2.3	0
Currency
Derivative [Line Items]
Euros in forward contracts | €	€ 25,300,000		€ 18,900,000
Convertible Notes Payable
Derivative [Line Items]
Risk-free interest rate (percent)	1.10%		1.60%
Expected equity volatility rate (percent)	45.00%	45.00%
Zhenjiang term loans
Derivative [Line Items]
Maximum period for variable interest rate paid (in months)	6 months

Derivative And Other Financia44

Derivative And Other Financial Instruments (Schedule of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Asset
Fair value	$ 9.3	$ 5.5
Effect of counterparty netting	(8.2)	(5.4)
Effect of cash collateral	0	0
Net derivatives as classified in the balance sheet	1.1	0.1
Liability
Fair value	(24.6)	(29.5)
Effect of counterparty netting	8.2	5.4
Effect of cash collateral	1.5	5.2
Net derivatives as classified in the balance sheet	(14.9)	(18.9)
Metal
Asset
Fair value	9.1	5.4
Liability
Fair value	(23.5)	(28.4)
Energy Related Derivative
Asset
Fair value	0	0.1
Liability
Fair value	(1)	(0.3)
Currency
Asset
Fair value	0.2	0
Liability
Fair value	$ (0.1)	$ (0.8)

Derivative And Other Financia45

Derivative And Other Financial Instruments (Schedule of Derivative Instruments in Balance Sheet by Contract Type) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets	$ 34.1	$ 28.7
Other long-term assets	81.9	82.9
Total Asset Derivatives	1.1	0.1
Accrued liabilities	210.2	233.8
Other long-term liabilities	67.6	67.6
Total Liability Derivatives	14.9	18.9
Metal
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets	0.9	0
Other long-term assets	0.1	0.1
Accrued liabilities	12.9	16.6
Other long-term liabilities	1	1.3
Energy Related Derivative
Derivatives, Fair Value [Line Items]
Accrued liabilities	1	0.2
Currency
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets	0.1	0
Accrued liabilities	0	0.7
Other long-term liabilities	$ 0	$ 0.1

Derivative And Other Financia46

Derivative And Other Financial Instruments (Schedule of Realized (Gains) Losses on Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Metal
Derivative Instruments, Loss [Line Items]
Realized (gains) losses on derivative financial instruments	$ 7.3	$ (11.5)
Energy Related Derivative
Derivative Instruments, Loss [Line Items]
Realized (gains) losses on derivative financial instruments	0.6	1
Currency
Derivative Instruments, Loss [Line Items]
Realized (gains) losses on derivative financial instruments	$ 0.3	$ 0.1

Derivative And Other Financia47

Derivative And Other Financial Instruments (Schedule of Fair Value for Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 61.9	$ 62.2
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of credit	110	0
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables held in escrow	25.6	25.1
Exchangeable notes	63.3	63.3
7 5/8% Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	434.5	362.1
7 7/8% Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	375.2	336.7
Zhenjiang term loans | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Zhenjiang term loans	180	179
Zhenjiang revolver | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of credit	25.7	25.6
Carrying Amount | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	61.9	62.2
Carrying Amount | Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of credit	110	0
Carrying Amount | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivables held in escrow	25.5	25.1
Exchangeable notes	44.4	44.3
Carrying Amount | 7 5/8% Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	431.3	430.8
Carrying Amount | 7 7/8% Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	434.7	434.3
Carrying Amount | Zhenjiang term loans | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Zhenjiang term loans	179.3	178.3
Carrying Amount | Zhenjiang revolver | Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of credit	$ 25.5	$ 25.5

Discontinued Operations (Narrat

Discontinued Operations (Narratives) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount invoiced		$ 1.6	$ 1
Recycling and Specification Alloys and Extrusions Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales of disposed entities	$ 10.1	15.8
Purchases of disposed entities	$ 2.2	$ 4.6

Discontinued Operations (Statem

Discontinued Operations (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of discontinued operations	$ 0	$ 205.3
Income from discontinued operations, net of tax	$ 0	131.1
Recycling and Specification Alloys and Extrusions Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		287.7
Cost of sales		270
Selling, general and administrative expenses		8.7
Other operating income, net		(2.6)
Operating income from discontinued operations		11.6
Net gain on sale of discontinued operations		205.3
Income from discontinued operations before income taxes		216.9
Provision for income taxes		85.8
Income from discontinued operations, net of tax		$ 131.1

Discontinued Operations (Stat50

Discontinued Operations (Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of discontinued operations	$ 0	$ 205.3
Recycling and Specification Alloys and Extrusions Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for property, plant and equipment		15.5
Net gain on sale of discontinued operations		$ 205.3

Condensed Consolidating Finan51

Condensed Consolidating Financial Statements (Condensed Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 61.9	$ 62.2
Accounts receivable, net	278.1	216.2
Inventories	485.5	480.3
Prepaid expenses and other current assets	34.1	28.7
Intercompany receivables	0	0
Total Current Assets	859.6	787.4
Property, plant and equipment, net	1,225.8	1,138.7
Intangible assets, net	38.4	38.9
Deferred income taxes	112.6	112.6
Other long-term assets	81.9	82.9
Investments in subsidiaries	0	0
Total Assets	2,318.3	2,160.5
Current Liabilities
Accounts payable	269.4	223.2
Accrued liabilities	210.2	233.8
Current portion of long-term debt	18	8.7
Intercompany payables	0	0
Total Current Liabilities	497.6	465.7
Long-term debt	1,211.9	1,109.6
Deferred income taxes	6	2.5
Accrued pension benefits	152.3	149.1
Accrued postretirement benefits	38	38.8
Other long-term liabilities	67.6	67.6
Total Long-Term Liabilities	1,475.8	1,367.6
Total equity	344.9	327.2
Total Liabilities and Equity	2,318.3	2,160.5
Aleris Corporation (Parent)
Current Assets
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Inventories	0	0
Prepaid expenses and other current assets	0	0
Intercompany receivables	0	0
Total Current Assets	0	0
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Deferred income taxes	0	0
Other long-term assets	0	0
Investments in subsidiaries	345.8	327.7
Total Assets	345.8	327.7
Current Liabilities
Accounts payable	0	0
Accrued liabilities	0	0
Current portion of long-term debt	0	0
Intercompany payables	0.8	0.4
Total Current Liabilities	0.8	0.4
Long-term debt	0	0
Deferred income taxes	0	0
Accrued pension benefits	0	0
Accrued postretirement benefits	0	0
Other long-term liabilities	0	0
Total Long-Term Liabilities	0	0
Total equity	345	327.3
Total Liabilities and Equity	345.8	327.7
Aleris International, Inc.
Current Assets
Cash and cash equivalents	0	0
Accounts receivable, net	0.3	1.5
Inventories	0	0
Prepaid expenses and other current assets	3	3.2
Intercompany receivables	346.3	152.4
Total Current Assets	349.6	157.1
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Deferred income taxes	0	0
Other long-term assets	18.6	15.6
Investments in subsidiaries	1,184.1	1,175
Total Assets	1,552.3	1,347.7
Current Liabilities
Accounts payable	6	1.3
Accrued liabilities	22.3	20.8
Current portion of long-term debt	0	0
Intercompany payables	157.9	88.5
Total Current Liabilities	186.2	110.6
Long-term debt	1,020.3	909.4
Deferred income taxes	0	0
Accrued pension benefits	0	0
Accrued postretirement benefits	0	0
Other long-term liabilities	0	0
Total Long-Term Liabilities	1,020.3	909.4
Total equity	345.8	327.7
Total Liabilities and Equity	1,552.3	1,347.7
Guarantors
Current Assets
Cash and cash equivalents	0	0
Accounts receivable, net	108.8	73.5
Inventories	197.1	191.3
Prepaid expenses and other current assets	14.2	14.2
Intercompany receivables	104.4	29.1
Total Current Assets	424.5	308.1
Property, plant and equipment, net	659.8	582.6
Intangible assets, net	22.5	23
Deferred income taxes	0	0
Other long-term assets	5.5	5.4
Investments in subsidiaries	4.9	5
Total Assets	1,117.2	924.1
Current Liabilities
Accounts payable	135.3	102.9
Accrued liabilities	94.1	108.7
Current portion of long-term debt	0.4	0.6
Intercompany payables	263.9	75.1
Total Current Liabilities	493.7	287.3
Long-term debt	0.4	0.4
Deferred income taxes	0.2	0.2
Accrued pension benefits	49.1	50.5
Accrued postretirement benefits	38	38.8
Other long-term liabilities	36.6	36.5
Total Long-Term Liabilities	124.3	126.4
Total equity	499.2	510.4
Total Liabilities and Equity	1,117.2	924.1
Non-Guarantors
Current Assets
Cash and cash equivalents	61.9	62.2
Accounts receivable, net	169	141.2
Inventories	288.4	289
Prepaid expenses and other current assets	16.9	11.3
Intercompany receivables	16.1	18.2
Total Current Assets	552.3	521.9
Property, plant and equipment, net	566	556.1
Intangible assets, net	15.9	15.9
Deferred income taxes	112.6	112.6
Other long-term assets	57.8	61.9
Investments in subsidiaries	0	0
Total Assets	1,304.6	1,268.4
Current Liabilities
Accounts payable	128.1	119
Accrued liabilities	93.8	104.3
Current portion of long-term debt	17.6	8.1
Intercompany payables	44.2	35.7
Total Current Liabilities	283.7	267.1
Long-term debt	191.2	199.8
Deferred income taxes	5.8	2.3
Accrued pension benefits	103.2	98.6
Accrued postretirement benefits	0	0
Other long-term liabilities	31	31.1
Total Long-Term Liabilities	331.2	331.8
Total equity	689.7	669.5
Total Liabilities and Equity	1,304.6	1,268.4
Eliminations
Current Assets
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Inventories	0	0
Prepaid expenses and other current assets	0	0
Intercompany receivables	(466.8)	(199.7)
Total Current Assets	(466.8)	(199.7)
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Deferred income taxes	0	0
Other long-term assets	0	0
Investments in subsidiaries	(1,534.8)	(1,507.7)
Total Assets	(2,001.6)	(1,707.4)
Current Liabilities
Accounts payable	0	0
Accrued liabilities	0	0
Current portion of long-term debt	0	0
Intercompany payables	(466.8)	(199.7)
Total Current Liabilities	(466.8)	(199.7)
Long-term debt	0	0
Deferred income taxes	0	0
Accrued pension benefits	0	0
Accrued postretirement benefits	0	0
Other long-term liabilities	0	0
Total Long-Term Liabilities	0	0
Total equity	(1,534.8)	(1,507.7)
Total Liabilities and Equity	$ (2,001.6)	$ (1,707.4)

Condensed Consolidating Finan52

Condensed Consolidating Financial Statements (Condensed Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 662.5	$ 746.2
Cost of sales	589	689.4
Gross profit	73.5	56.8
Selling, general and administrative expenses	50.3	61.3
Restructuring charges	0.8	2.9
(Gains) losses on derivative financial instruments	(1)	9.1
Other operating expense, net	0.4	1
Operating income (loss)	23	(17.5)
Interest expense, net	18.1	26.6
Other (income) expense, net	2.5	(16.2)
Equity in net (earnings) loss of affiliates	0	0
Income (loss) from continuing operations before income taxes	2.4	(27.9)
(Benefit from) provision for income taxes	8.7	(2.3)
Loss from continuing operations	(6.3)	(25.6)
Income (loss) from discontinued operations, net of tax	0	131.1
Net (loss) income	(6.3)	105.5
Net income from discontinued operations attributable to noncontrolling interest	0	0.1
Net (loss) income attributable to Aleris Corporation	(6.3)	105.4
Comprehensive income (loss)	16.6	71.7
Comprehensive income attributable to noncontrolling interest	0	0.1
Comprehensive income attributable to Aleris Corporation	16.6	71.6
Aleris Corporation (Parent)
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	0	0
Restructuring charges	0	0
(Gains) losses on derivative financial instruments	0	0
Other operating expense, net	0	0
Operating income (loss)	0	0
Interest expense, net	0	0
Other (income) expense, net	0	0
Equity in net (earnings) loss of affiliates	6.3	(105.4)
Income (loss) from continuing operations before income taxes	(6.3)	105.4
(Benefit from) provision for income taxes	0	0
Loss from continuing operations		105.4
Income (loss) from discontinued operations, net of tax		0
Net (loss) income	(6.3)	105.4
Net income from discontinued operations attributable to noncontrolling interest		0
Net (loss) income attributable to Aleris Corporation		105.4
Comprehensive income (loss)	16.6	71.6
Comprehensive income attributable to noncontrolling interest		0
Comprehensive income attributable to Aleris Corporation		71.6
Aleris International, Inc.
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	1.3	4.5
Restructuring charges	0	0
(Gains) losses on derivative financial instruments	0	0
Other operating expense, net	0	0
Operating income (loss)	(1.3)	(4.5)
Interest expense, net	0	0
Other (income) expense, net	(3.7)	(0.6)
Equity in net (earnings) loss of affiliates	8.7	71.4
Income (loss) from continuing operations before income taxes	(6.3)	(75.3)
(Benefit from) provision for income taxes	0	0
Loss from continuing operations		(75.3)
Income (loss) from discontinued operations, net of tax		180.7
Net (loss) income	(6.3)	105.4
Net income from discontinued operations attributable to noncontrolling interest		0
Net (loss) income attributable to Aleris Corporation		105.4
Comprehensive income (loss)	16.6	71.6
Comprehensive income attributable to noncontrolling interest		0
Comprehensive income attributable to Aleris Corporation		71.6
Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenues	334.1	407.6
Cost of sales	306.7	378.4
Gross profit	27.4	29.2
Selling, general and administrative expenses	28.6	30.8
Restructuring charges	0.3	2.2
(Gains) losses on derivative financial instruments	1.7	(1.6)
Other operating expense, net	0.3	0.9
Operating income (loss)	(3.5)	(3.1)
Interest expense, net	9.8	22.1
Other (income) expense, net	(1.2)	(1)
Equity in net (earnings) loss of affiliates	(0.4)	(0.7)
Income (loss) from continuing operations before income taxes	(11.7)	(23.5)
(Benefit from) provision for income taxes	(0.2)	(6.2)
Loss from continuing operations		(17.3)
Income (loss) from discontinued operations, net of tax		(93.4)
Net (loss) income	(11.5)	(110.7)
Net income from discontinued operations attributable to noncontrolling interest		0
Net (loss) income attributable to Aleris Corporation		(110.7)
Comprehensive income (loss)	(10.5)	(113.1)
Comprehensive income attributable to noncontrolling interest		0
Comprehensive income attributable to Aleris Corporation		(113.1)
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenues	332.1	343
Cost of sales	286	315.4
Gross profit	46.1	27.6
Selling, general and administrative expenses	20.4	26
Restructuring charges	0.5	0.7
(Gains) losses on derivative financial instruments	(2.7)	10.7
Other operating expense, net	0.1	0.1
Operating income (loss)	27.8	(9.9)
Interest expense, net	8.3	4.5
Other (income) expense, net	7.4	(14.6)
Equity in net (earnings) loss of affiliates	0	0
Income (loss) from continuing operations before income taxes	12.1	0.2
(Benefit from) provision for income taxes	8.9	3.9
Loss from continuing operations		(3.7)
Income (loss) from discontinued operations, net of tax		43.8
Net (loss) income	3.2	40.1
Net income from discontinued operations attributable to noncontrolling interest		0.1
Net (loss) income attributable to Aleris Corporation		40
Comprehensive income (loss)	25.2	8.7
Comprehensive income attributable to noncontrolling interest		0.1
Comprehensive income attributable to Aleris Corporation		8.6
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenues	(3.7)	(4.4)
Cost of sales	(3.7)	(4.4)
Gross profit	0	0
Selling, general and administrative expenses	0	0
Restructuring charges	0	0
(Gains) losses on derivative financial instruments	0	0
Other operating expense, net	0	0
Operating income (loss)	0	0
Interest expense, net	0	0
Other (income) expense, net	0	0
Equity in net (earnings) loss of affiliates	(14.6)	34.7
Income (loss) from continuing operations before income taxes	14.6	(34.7)
(Benefit from) provision for income taxes	0	0
Loss from continuing operations		(34.7)
Income (loss) from discontinued operations, net of tax		0
Net (loss) income	14.6	(34.7)
Net income from discontinued operations attributable to noncontrolling interest		0
Net (loss) income attributable to Aleris Corporation		(34.7)
Comprehensive income (loss)	$ (31.3)	32.9
Comprehensive income attributable to noncontrolling interest		0
Comprehensive income attributable to Aleris Corporation		$ 32.9

Condensed Consolidating Finan53

Condensed Consolidating Financial Statements (Condensed Cash Flow Statement) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	$ 11.2	$ (120.3)
Investing activities
Payments for property, plant and equipment	(122)	(65.2)
Proceeds from the sale of businesses, net of cash transferred	0	518
Disbursements of intercompany loans		0
Repayments from intercompany loans		0
Equity contributions in subsidiaries		0
Return of investment in subsidiaries	0
Other	(0.1)	(0.4)
Net cash (used) provided by investing activities	(122.1)	452.4
Financing activities
Proceeds from revolving credit facilities	110	159.5
Payments on revolving credit facilities	(0.2)	(377.6)
Net proceeds from (payments on) other long-term debt	(0.3)	0.9
Debt issuance costs	(0.4)	0
Dividends paid	0	0
Proceeds from intercompany loans		0
Repayments on intercompany loans		0
Proceeds from intercompany equity contributions		0
Other	(0.4)	(0.8)
Net cash provided (used) by financing activities	108.7	(218)
Effect of exchange rate differences on cash and cash equivalents	1.9	(4)
Net (decrease) increase in cash and cash equivalents	(0.3)	110.1
Cash and cash equivalents at beginning of the period	62.2	36
Cash and cash equivalents at end of period	61.9	146.1
Cash and cash equivalents of continuing operations	61.9
Aleris Corporation (Parent)
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	0.4	0.6
Investing activities
Payments for property, plant and equipment	0	0
Proceeds from the sale of businesses, net of cash transferred		0
Disbursements of intercompany loans		0
Repayments from intercompany loans		0
Equity contributions in subsidiaries		0
Return of investment in subsidiaries	0	0
Other	0	0
Net cash (used) provided by investing activities	0	0
Financing activities
Proceeds from revolving credit facilities	0	0
Payments on revolving credit facilities	0	0
Net proceeds from (payments on) other long-term debt	0	0
Debt issuance costs	$ 0
Dividends paid		0
Proceeds from intercompany loans		0
Repayments on intercompany loans		0
Proceeds from intercompany equity contributions		0
Other	$ (0.4)	(0.6)
Net cash provided (used) by financing activities	(0.4)	(0.6)
Effect of exchange rate differences on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of period		0
Cash and cash equivalents of continuing operations	0
Aleris International, Inc.
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	(115)	37.1
Investing activities
Payments for property, plant and equipment	0	0
Proceeds from the sale of businesses, net of cash transferred		289.9
Disbursements of intercompany loans		(20.4)
Repayments from intercompany loans		5.4
Equity contributions in subsidiaries		(137.5)
Return of investment in subsidiaries	5	171.3
Other	0	(1.1)
Net cash (used) provided by investing activities	5	307.6
Financing activities
Proceeds from revolving credit facilities	110	111
Payments on revolving credit facilities	0	(335)
Net proceeds from (payments on) other long-term debt	0.1	0.1
Debt issuance costs	$ (0.4)
Dividends paid		0
Proceeds from intercompany loans		20.3
Repayments on intercompany loans		(34.3)
Proceeds from intercompany equity contributions		0
Other	$ 0.3	(0.2)
Net cash provided (used) by financing activities	110	(238.1)
Effect of exchange rate differences on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	106.6
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of period		106.6
Cash and cash equivalents of continuing operations	0
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	100.3	77.4
Investing activities
Payments for property, plant and equipment	(99.7)	(45)
Proceeds from the sale of businesses, net of cash transferred		0
Disbursements of intercompany loans		(0.2)
Repayments from intercompany loans		3.8
Equity contributions in subsidiaries		(1.1)
Return of investment in subsidiaries	0.1	0.6
Other	0	0.7
Net cash (used) provided by investing activities	(99.6)	(41.2)
Financing activities
Proceeds from revolving credit facilities	0	0
Payments on revolving credit facilities	0	0
Net proceeds from (payments on) other long-term debt	(0.3)	(0.1)
Debt issuance costs	0
Dividends paid	(0.3)	(173.5)
Proceeds from intercompany loans		0
Repayments on intercompany loans		0
Proceeds from intercompany equity contributions		137.4
Other	(0.1)	0
Net cash provided (used) by financing activities	(0.7)	(36.2)
Effect of exchange rate differences on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of period		0
Cash and cash equivalents of continuing operations	0
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	26	(37.5)
Investing activities
Payments for property, plant and equipment	(22.3)	(20.2)
Proceeds from the sale of businesses, net of cash transferred		228.1
Disbursements of intercompany loans		(20.3)
Repayments from intercompany loans		34.3
Equity contributions in subsidiaries		0
Return of investment in subsidiaries	0	0
Other	(0.1)	0
Net cash (used) provided by investing activities	(22.4)	221.9
Financing activities
Proceeds from revolving credit facilities	0	48.5
Payments on revolving credit facilities	(0.2)	(42.6)
Net proceeds from (payments on) other long-term debt	(0.1)	0.9
Debt issuance costs	0
Dividends paid	(5.3)	(194)
Proceeds from intercompany loans		20.6
Repayments on intercompany loans		(9.2)
Proceeds from intercompany equity contributions		1.2
Other	(0.2)	0
Net cash provided (used) by financing activities	(5.8)	(174.6)
Effect of exchange rate differences on cash and cash equivalents	1.9	(4)
Net (decrease) increase in cash and cash equivalents	(0.3)	5.8
Cash and cash equivalents at beginning of the period	62.2	36
Cash and cash equivalents at end of period		41.8
Cash and cash equivalents of continuing operations	61.9
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided (used) by operating activities	(0.5)	(197.9)
Investing activities
Payments for property, plant and equipment	0	0
Proceeds from the sale of businesses, net of cash transferred		0
Disbursements of intercompany loans		40.9
Repayments from intercompany loans		(43.5)
Equity contributions in subsidiaries		138.6
Return of investment in subsidiaries	(5.1)	(171.9)
Other	0	0
Net cash (used) provided by investing activities	(5.1)	(35.9)
Financing activities
Proceeds from revolving credit facilities	0	0
Payments on revolving credit facilities	0	0
Net proceeds from (payments on) other long-term debt	0	0
Debt issuance costs	0
Dividends paid	5.6	367.5
Proceeds from intercompany loans		(40.9)
Repayments on intercompany loans		43.5
Proceeds from intercompany equity contributions		(138.6)
Other	0	0
Net cash provided (used) by financing activities	5.6	231.5
Effect of exchange rate differences on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	(2.3)
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of period		$ (2.3)
Cash and cash equivalents of continuing operations	$ 0