Ak Steel Holding (AKS) 10-Q 29 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 31, 2019	Apr. 25, 2019
Document Information [Line Items]
Entity Registrant Name	AK STEEL HOLDING CORPORATION
Entity Central Index Key	0000918160
Trading Symbol	AKS
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		316,344,103

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net sales	$ 1,697.7	$ 1,658.9
Cost of products sold (exclusive of items shown separately below)	1,465.4	1,463.7
Selling and administrative expenses	76.6	76.7
Depreciation	50.4	54.9
Ashland Works closure	64.1	0
Total operating costs	1,656.5	1,595.3
Operating profit	41.2	63.6
Interest expense	37.9	37.6
Pension and OPEB (income) expense	6.5	(10)
Other (income) expense	(12.7)	(3.9)
Income before income taxes	9.5	39.9
Income tax expense (benefit)	1.4	(4.9)
Net income	8.1	44.8
Less: Net income attributable to noncontrolling interests	12.6	16.1
Net income (loss) attributable to AK Steel Holding Corporation	$ (4.5)	$ 28.7
Net income (loss) per share attributable to AK Steel Holding Corporation common stockholders:
Basic	$ (0.01)	$ 0.09
Diluted	$ (0.01)	$ 0.09

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 8.1	$ 44.8
Other comprehensive income (loss), before tax:
Foreign currency translation gain (loss)	(0.7)	1.1
Cash flow hedges:
Gains (losses) arising in period	7.4	(1.4)
Reclassification of losses (gains) to net income	(6.4)	(7.6)
Pension and OPEB plans:
Reclassification of prior service cost (credits) to net income	(2.6)	(2.4)
Reclassification of losses (gains) to net income	(2.6)	3.6
Other comprehensive income (loss), before tax	(4.9)	(6.7)
Income tax benefit related to items of comprehensive income (loss)	0	0
Other comprehensive income (loss)	(4.9)	(6.7)
Comprehensive income	3.2	38.1
Less: Comprehensive income attributable to noncontrolling interests	12.6	16.1
Comprehensive income (loss) attributable to AK Steel Holding Corporation	$ (9.4)	$ 22

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 41.2	$ 48.6
Accounts receivable, net	720.6	635.8
Inventory	1,378.8	1,419.9
Other current assets	88.8	97
Total current assets	2,229.4	2,201.3
Property, plant and equipment	6,996.4	6,969.2
Accumulated depreciation	(5,106.7)	(5,057.6)
Property, plant and equipment, net	1,889.7	1,911.6
Operating lease assets	254	0
Other non-current assets	397	402.8
TOTAL ASSETS	4,770.1	4,515.7
Current liabilities:
Accounts payable	768.2	801
Accrued liabilities	225.2	288.9
Current portion of operating lease liabilities	56.1	0
Current portion of pension and other postretirement benefit obligations	38.2	38.7
Total current liabilities	1,087.7	1,128.6
Non-current liabilities:
Long-term debt	2,037.7	1,993.7
Long-term operating lease liabilities	220.3	0
Pension and other postretirement benefit obligations	824.2	829.9
Other non-current liabilities	170.4	134
TOTAL LIABILITIES	4,340.3	4,086.2
Equity:
Common stock, authorized 450,000,000 shares of $0.01 par value each; issued 317,669,397 and 316,595,613 shares in 2019 and 2018; outstanding 316,306,678 and 315,535,765 shares in 2019 and 2018	3.2	3.2
Additional paid-in capital	2,899.2	2,894.9
Treasury stock, common shares at cost, 1,362,719 and 1,059,848 shares in 2019 and 2018	(7.2)	(6.4)
Accumulated deficit	(2,696.3)	(2,691.8)
Accumulated other comprehensive loss	(104.9)	(100)
Total stockholders’ equity	94	99.9
Noncontrolling interests	335.8	329.6
TOTAL EQUITY	429.8	429.5
TOTAL LIABILITIES AND EQUITY	4,770.1	4,515.7
SunCoke Middletown [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Current assets:
Cash and cash equivalents	0.3	1.1
Accounts receivable, net	11.6	0.5
Inventory	25.2	21.1
Property, plant and equipment	427.7	427.8
Accumulated depreciation	(112.5)	(106.9)
Current liabilities:
Accounts payable	16.8	13.7
Other assets (liabilities), net	(1)	(1.7)
Equity:
Noncontrolling interests	334.5	328.2
Other Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Current assets:
Cash and cash equivalents	0.2	0.5
Property, plant and equipment	11.7	11.7
Accumulated depreciation	(9.9)	(9.8)
Current liabilities:
Other assets (liabilities), net	0.5	0.5
Equity:
Noncontrolling interests	$ 1.3	$ 1.4

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) Parentheticals - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Common Stock, Shares Authorized	450,000,000	450,000,000
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Shares Issued	317,669,397	316,595,613
Common Stock, Shares Outstanding	316,306,678	315,535,765
Treasury Stock, Shares	1,362,719	1,059,848

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 8.1	$ 44.8
Depreciation	50.4	54.9
Amortization	10.1	10
Ashland Works closure	64.1	0
Deferred income taxes	0.3	(6.8)
Pension and OPEB expense (income)	7.9	(8.1)
Contributions to pension trust	(9.2)	(6)
Other postretirement benefit payments	(9.6)	(10.1)
Changes in working capital	(95.8)	0.2
Other operating items, net	(34.2)	(13.3)
Net cash flows from operating activities	(7.9)	65.6
Cash flows from investing activities:
Capital investments	(44.8)	(37.9)
Other investing items, net	11.6	0
Net cash flows from investing activities	(33.2)	(37.9)
Cash flows from financing activities:
Net borrowings (payments) under credit facility	45	(10)
Redemption of long-term debt	(4)	0
SunCoke Middletown distributions to noncontrolling interest owners	(6.4)	(10.3)
Other financing items, net	(0.9)	(0.9)
Net cash flows from financing activities	33.7	(21.2)
Net increase (decrease) in cash and cash equivalents	(7.4)	6.5
Cash and cash equivalents, beginning of period	48.6	38
Cash and cash equivalents, end of period	41.2	44.5
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Cash flows from operating activities:
Depreciation	42.9	51.1
Variable Interest Entity, Primary Beneficiary [Member] | SunCoke Middletown [Member]
Cash flows from operating activities:
Depreciation	7.5	3.8
Net cash flows from operating activities	7	21.5
Cash flows from financing activities:
SunCoke Middletown distributions to noncontrolling interest owners	$ (6.4)	$ (10.3)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) (unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ (0.8)	$ 0.8
Beginning Balance at Dec. 31, 2017		$ 3.2	$ 2,884.8	$ (5.4)	(2,877)	(50.2)	$ 345.2
Share-based compensation			4.5
Purchase of treasury stock				(1)
Net income (loss)	$ 44.8				28.7		16.1
Change in accumulated other comprehensive income (loss)						(6.7)
Net distributions to noncontrolling interests							(10.3)
Ending Balance at Mar. 31, 2018	331.9	3.2	2,889.3	(6.4)	(2,849.1)	(56.1)	351
Cumulative Effect of New Accounting Principle in Period of Adoption					0	0
Beginning Balance at Dec. 31, 2018	429.5	3.2	2,894.9	(6.4)	(2,691.8)	(100)	329.6
Share-based compensation			4.3
Purchase of treasury stock				(0.8)
Net income (loss)	8.1				(4.5)		12.6
Change in accumulated other comprehensive income (loss)						(4.9)
Net distributions to noncontrolling interests							(6.4)
Ending Balance at Mar. 31, 2019	$ 429.8	$ 3.2	$ 2,899.2	$ (7.2)	$ (2,696.3)	$ (104.9)	$ 335.8

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation— These financial statements consolidate the operations and accounts of AK Steel Holding Corporation (“AK Holding”), its wholly owned subsidiary AK Steel Corporation (“AK Steel”), all subsidiaries in which AK Holding has a controlling interest, and two variable interest entities for which AK Steel is the primary beneficiary. Unless the context provides otherwise, references to “we,” “us” and “our” refer to AK Holding and its subsidiaries. In our opinion, the accompanying condensed consolidated financial statements contain all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2019 and December 31, 2018 , our results of operations for the three months ended March 31, 2019 and 2018 , and our cash flows for the three months ended March 31, 2019 and 2018 . Our results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results we expect for the full year ending December 31, 2019 . These condensed consolidated financial statements should be read along with our audited consolidated financial statements for the year ended December 31, 2018 , included in our Annual Report on Form 10-K for the year ended December 31, 2018 . Leases— We determine if an arrangement contains a lease at inception. We recognize right-of-use assets and liabilities associated with leases based on the present value of the future minimum lease payments over the lease term at the later of the commencement date of the lease or January 1, 2019 (the implementation date of Accounting Standards Update No. 2016-02, Leases (Topic 842)

Supplementary Financial Stateme

Supplementary Financial Statement Information (Notes)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Supplementary Financial Statement Information	Supplementary Financial Statement Information Revenue Net sales by market are presented below: Three Months Ended March 31, 2019 2018 Automotive $ 1,090.9 $ 1,119.1 Infrastructure and Manufacturing 278.1 241.3 Distributors and Converters 328.7 298.5 Total $ 1,697.7 $ 1,658.9 Net sales by product line are presented below: Three Months Ended March 31, 2019 2018 Carbon steel $ 1,099.2 $ 1,068.6 Stainless and electrical steel 444.5 426.1 Tubular products, components and other 154.0 164.2 Total $ 1,697.7 $ 1,658.9 We sell domestically to customers located primarily in the Midwestern, Southern and Eastern United States and to foreign customers, primarily in Canada, Mexico and Western Europe. Net sales to customers located outside the United States were $143.2 for the three months ended March 31, 2019 , compared to $167.8 for the corresponding period in 2018 . Inventory Inventories as of March 31, 2019 and December 31, 2018 , are presented below: March 31, December 31, Finished and semi-finished $ 1,021.9 $ 1,054.4 Raw materials 356.9 365.5 Inventory $ 1,378.8 $ 1,419.9 Other Non-Current Assets Intangible assets at March 31, 2019 and December 31, 2018 , consist of: Gross Amount Accumulated Amortization Net Amount As of March 31, 201 9 Customer relationships $ 36.6 $ (8.7 ) $ 27.9 Technology 19.3 (5.3 ) 14.0 Intangible assets $ 55.9 $ (14.0 ) $ 41.9 As of December 31, 2018 Customer relationships $ 36.6 $ (7.4 ) $ 29.2 Technology 19.3 (4.6 ) 14.7 Intangible assets $ 55.9 $ (12.0 ) $ 43.9 Amortization expense related to intangible assets was $2.0 for the three months ended March 31, 2019 and $2.4 for the three months ended March 31, 2018 . Investments in Affiliates We have investments in several businesses that are accounted for using the equity method of accounting. Summarized financial statement data for all investees is presented below. Three Months Ended March 31, 2019 2018 Revenue $ 77.8 $ 74.8 Gross profit 21.5 21.1 Net income 2.7 4.2 Our share of income of equity investees (included in cost of products sold) 0.7 1.3 Ashland Works Closure In January 2019, our Board of Directors approved and we announced the planned closure of our Ashland Works, including the previously idled blast furnace and steelmaking operations (“Ashland Works Hot End”) and the hot dip galvanizing coating line that has remained operational, subject to negotiations with the labor union at that facility. Factors that influenced our decision to close Ashland Works included an uncertain global trade landscape influenced by shifting domestic and international political priorities, Ashland Works’ high cost of production, and continued intense competition from domestic and foreign steel competitors. These conditions directly impact our pricing, which in turn directly impacts our assessment of the demand forecasts for the markets we serve. Despite several successful trade actions, we continue to see a high level of carbon steel imports driven by global overcapacity, particularly in China. The global overcapacity is expected to be exacerbated by several domestic steel companies that have restarted or plan new capacity additions in the United States. In addition, we have recently concluded that we have sufficient coating capacity to meet our customers’ needs without using our coating operations at Ashland Works. We are transitioning products to our other U.S. coating lines, and plan to close the Ashland Works line before the end of 2019. We recorded a charge of $77.4 during the first quarter of 2019, which includes $18.5 for termination of take-or-pay supply agreements, $15.2 for supplemental unemployment and other employee benefit costs, pension and OPEB termination benefits of $13.3 (recorded in pension and OPEB (income) expense), an estimated multiemployer plan withdrawal liability of $23.0 , and $7.4 for other costs. The supplemental unemployment and other employee benefit costs are expected to be paid primarily in 2020 and 2021. For the $77.4 charge, we expect to make cash payments of approximately $15.0 in 2019, $30.0 in 2020 and the remaining amount over several years thereafter. The actual multiemployer plan withdrawal liability will not be known until 2020 and is expected to be paid over a number of years. In addition to the $77.4 charge recorded in the first quarter of 2019, we expect to record expenses of approximately $14.0 over the full-year 2019, consisting of cash costs of approximately $10.0 related to closing the facility and $4.0 of accelerated depreciation related to the coating line fixed assets. These cash costs related to closing the facility will decline in future years and no depreciation expense will be incurred beyond 2019. On-going costs for maintenance of the equipment, utilities and supplier obligations related to the idled Ashland Works Hot End were $2.5 and $5.4 for the three months ended March 31, 2019

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes recorded for the periods ended March 31, 2019 and 2018 , were estimated using the discrete method. Income taxes are based on our financial results through the end of the period, as well as the related change in the valuation allowance on deferred tax assets. We are unable to estimate the annual effective tax rate with sufficient precision for purposes of the effective tax rate method, which requires us to consider a projection of full-year income and the expected change in the valuation allowance. The estimated annual effective tax rate method was not reliable due to its sensitivity to small changes to forecasted annual pre-tax earnings and the effect of our valuation allowance, which create results with significant variations in the customary relationship between income tax expense and pre-tax income for the interim periods. As a result, we determined that using the discrete method is more appropriate than using the annual effective tax rate method. During the first three months of 2018, we reduced our valuation allowance and recorded an income tax benefit of $5.3 as a result of changes to the tax net operating loss carryover rules included in the Tax Cuts and Jobs Act of 2017 that allow us to use certain indefinite-lived deferred tax liabilities as a source of future income to realize deferred tax assets.

Long-term Debt and Other Financ

Long-term Debt and Other Financing Long-term Debt and Other Financing (Notes)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-term Debt and Other Financing	Long-term Debt and Other Financing Debt balances at March 31, 2019 and December 31, 2018 , are presented below: March 31, December 31, Credit Facility $ 380.0 $ 335.0 7.50% Senior Secured Notes due July 2023 (effective rate of 8.3%) 380.0 380.0 5.00% Exchangeable Senior Notes due November 2019 (effective rate of 10.8%) 148.5 148.5 7.625% Senior Notes due October 2021 406.2 406.2 6.375% Senior Notes due October 2025 (effective rate of 7.1%) 270.2 274.8 7.00% Senior Notes due March 2027 391.6 391.6 Industrial Revenue Bonds due 2020 through 2028 99.3 99.3 Unamortized debt discount and issuance costs (38.1 ) (41.7 ) Total long-term debt $ 2,037.7 $ 1,993.7 During the three months ended March 31, 2019 , we were in compliance with all the terms and conditions of our debt agreements. The Exchangeable Notes maturing in 2019 are classified as long-term based on our ability and intent to refinance that debt on a long-term basis. During the three months ended March 31, 2019 , we repurchased an aggregate principal amount of $4.6 of our 6.375% Senior Notes due October 2025 in private, open market transactions and recognized a net gain on the repurchases totaling $0.6 , which is included in other (income) expense. Credit Facility As of March 31, 2019 we had a $1,350.0 revolving credit facility (the “Credit Facility”), which expires in September 2022 . As of March 31, 2019 , we had outstanding borrowings of $380.0 under the Credit Facility. At March 31, 2019 , our eligible collateral under the Credit Facility, after application of applicable advance rates, was in excess of $1,350.0 . Availability as of March 31, 2019 , was $896.8 after reductions of $73.2 for outstanding letters of credit. In April 2019, we increased the Credit Facility by $150.0 to $1,500.0

Leases (Notes)

Leases (Notes)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lessee, Operating Leases [Text Block]	Leases We have leases primarily for offices, production buildings and equipment. Our leases have remaining contractual lease terms ranging from less than one year to 19 years. Certain of those leases include options to extend the leases, and those options are for periods from 1 to 32 years depending on the particular lease. Certain of the leases may also include options to terminate the leases within 1 year. Certain leases include variable lease payments based on production, usage or independent factors such as changes in published producer price indexes. Lease costs are presented below: Three Months Ended March 31, 2019 Operating leases $ 16.7 Short-term leases 11.1 Variable lease costs 17.3 Total $ 45.1 Other information related to leases was as follows: Three Months Ended March 31, 2019 Cash paid for operating cash flows from operating leases $ 18.1 Right-of-use assets obtained in exchange for operating lease liabilities 3.7 Weighted-average remaining lease term of operating leases (in years) 7.8 Weighted-average discount rate for operating leases 8.4 % Future minimum lease payments under noncancelable operating leases as of March 31, 2019 , were as follows: Year ending December 31: 2019 (remaining period of year) $ 53.3 2020 63.4 2021 50.8 2022 40.9 2023 34.8 Thereafter 148.2 Total future minimum operating lease payments 391.4 Less imputed interest 115.0 Total operating lease liabilities 276.4 Less current portion of operating lease liabilities 56.1 Long-term operating lease liabilities $ 220.3

Pension and Other Postretiremen

Pension and Other Postretirement Benefits (Notes)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits, Description [Abstract]
Pension and Other Postretirement Benefits	Pension and Other Postretirement Benefits Net periodic benefit (income) expense for pension and other postretirement benefits was as follows: Three Months Ended March 31, 2019 2018 Pension Benefits Service cost $ 0.5 $ 0.8 Interest cost 22.3 23.7 Expected return on assets (28.0 ) (38.8 ) Amortization of prior service cost 0.7 1.0 Amortization of (gain) loss (1.7 ) 3.9 Termination benefits—Ashland Works 9.7 — Net periodic benefit (income) expense $ 3.5 $ (9.4 ) Other Postretirement Benefits Service cost $ 0.9 $ 1.1 Interest cost 4.1 3.9 Amortization of prior service cost (credit) (3.3 ) (3.4 ) Amortization of (gain) loss (0.9 ) (0.3 ) Termination benefits—Ashland Works 3.6 — Net periodic benefit (income) expense $ 4.4 $ 1.3 We are required to contribute $45.9 to the master pension trust during 2019 , of which $9.2 was contributed through March 31, 2019 and another $10.3 was contributed in April 2019. Based on current actuarial assumptions, we estimate that our required pension contributions will be approximately $50.0 in 2020 and $50.0

Environmental and Legal Conting

Environmental and Legal Contingencies (Notes)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Environmental and Legal Contingencies	Environmental and Legal Contingencies Environmental Contingencies We and our predecessors have been involved in steel manufacturing and related operations since 1900. Although we believe our operating practices have been consistent with prevailing industry standards, hazardous materials may have been released at operating sites or third-party sites in the past, including operating sites that we no longer own. If we reasonably can, we have estimated potential remediation expenditures for those sites where future remediation efforts are probable based on identified conditions, regulatory requirements or contractual obligations arising from the sale of a business or facility. For sites involving government-required investigations, we typically make an estimate of potential remediation expenditures only after the investigation is complete and when we better understand the nature and scope of the remediation. In general, the material factors in these estimates include the costs associated with investigations, delineations, risk assessments, remedial work, governmental response and oversight, site monitoring, and preparation of reports to the appropriate environmental agencies. We have recorded the following liabilities for environmental matters on our condensed consolidated balance sheets: March 31, December 31, Accrued liabilities $ 7.3 $ 8.0 Other non-current liabilities 32.6 31.2 We cannot predict the ultimate costs for each site with certainty because of the evolving nature of the investigation and remediation process. Rather, to estimate the probable costs, we must make certain assumptions. The most significant of these assumptions is for the nature and scope of the work that will be necessary to investigate and remediate a particular site and the cost of that work. Other significant assumptions include the cleanup technology that will be used, whether and to what extent any other parties will participate in paying the investigation and remediation costs, reimbursement of past response and future oversight costs by governmental agencies, and the reaction of the governing environmental agencies to the proposed work plans. Costs for future investigation and remediation are not discounted to their present value. To the extent that we have been able to reasonably estimate future liabilities, we do not believe that there is a reasonable possibility that we will incur a loss or losses that exceed the amounts we accrued for the environmental matters discussed below that would, either individually or in the aggregate, have a material adverse effect on our consolidated financial condition, results of operations or cash flows. However, since we recognize amounts in the consolidated financial statements in accordance with accounting principles generally accepted in the United States that exclude potential losses that are not probable or that may not be currently estimable, the ultimate costs of these environmental proceedings may be higher than the liabilities we currently have recorded in our consolidated financial statements. Except as we expressly note below, we do not currently anticipate any material effect on our consolidated financial position, results of operations or cash flows as a result of compliance with current environmental regulations. Moreover, because all domestic steel producers operate under the same federal environmental regulations, we do not believe that we are more disadvantaged than our domestic competitors by our need to comply with these regulations. Some foreign competitors may benefit from less stringent environmental requirements in the countries where they produce, resulting in lower compliance costs for them and providing those foreign competitors with a cost advantage on their products. According to the Resource Conservation and Recovery Act (“RCRA”), which governs the treatment, handling and disposal of hazardous waste, the United States Environmental Protection Agency (“EPA”) and authorized state environmental agencies may conduct inspections of RCRA-regulated facilities to identify areas where there have been releases of hazardous waste or hazardous constituents into the environment and may order the facilities to take corrective action to remediate such releases. Environmental regulators may inspect our major steelmaking facilities. While we cannot predict the future actions of these regulators, it is possible that they may identify conditions in future inspections of these facilities which they believe require corrective action. Under authority from the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), the EPA and state environmental authorities have conducted site investigations at certain of our facilities and other third-party facilities, portions of which previously may have been used for disposal of materials that are currently regulated. The results of these investigations are still pending, and we could be directed to spend funds for remedial activities at the former disposal areas. Because of the uncertain status of these investigations, however, we cannot reliably predict whether or when such spending might be required or its magnitude. As previously reported, on April 29, 2002, we entered a mutually agreed-upon administrative order on consent with the EPA pursuant to Section 122 of CERCLA to perform a Remedial Investigation/Feasibility Study (“RI/FS”) of the Hamilton Plant site located in New Miami, Ohio. The plant ceased operations in 1990 and all of its former structures have been demolished. We submitted the investigation portion of the RI/FS, and we completed a supplemental study in 2014. We currently have accrued $0.7 for the remaining cost of the RI/FS. Until the RI/FS is complete, we cannot reliably estimate the additional costs, if any, we may incur for potentially required remediation of the site or when we may incur them. As previously reported, on September 30, 1998, our predecessor, Armco Inc., received an order from the EPA under Section 3013 of RCRA requiring it to develop a plan for investigation of eight areas of our Mansfield Works that allegedly could be sources of contamination. A site investigation began in November 2000 and is continuing. We cannot reliably estimate how long it will take to complete this site investigation. We currently have accrued $0.6 for the projected cost of the study. Until the site investigation is complete, we cannot reliably estimate the additional costs, if any, we may incur for potentially required remediation of the site or when we may incur them. As previously reported, on September 26, 2012, the EPA issued an order under Section 3013 of RCRA requiring us to develop a plan for investigation of four areas at our Ashland Works coke plant. The Ashland Works coke plant ceased operations in 2011 and all of its former structures have been demolished and removed. In 1981, we acquired the plant from Honeywell International Corporation (as successor to Allied Corporation), who had managed the coking operations there for approximately 60 years. In connection with the sale of the coke plant, Honeywell agreed to indemnify us from certain claims and obligations that could arise from the investigation and we intend to pursue such indemnification from Honeywell, if necessary. We cannot reliably estimate how long it will take to complete the site investigation. On March 10, 2016, the EPA invited us to participate in settlement discussions regarding an enforcement action. Settlement discussions between the parties are ongoing, though whether the parties will reach agreement and any such agreement’s terms are uncertain. We currently have accrued $1.4 for the projected cost of the investigation and known remediation. Until the site investigation is complete, we cannot reliably estimate the costs, if any, we may incur for potential additional required remediation of the site or when we may incur them. As previously reported, on July 15, 2009, we and the Pennsylvania Department of Environmental Protection (“PADEP”) entered a Consent Order and Agreement (the “Consent Order”) to resolve an alleged unpermitted discharge of wastewater from the closed Hillside Landfill at our former Ambridge Works. Under the terms of the Consent Order, we paid a penalty and also agreed to implement various corrective actions, including an investigation of the area where landfill activities occurred, submission of a plan to collect and treat surface waters and seep discharges, and upon approval from PADEP, implementation of that plan. We have accrued $5.6 for the remedial work required under the approved plan and Consent Order. We submitted a National Pollution Discharge Elimination System (“NPDES”) permit application to move to the next work phase. We currently estimate that the remaining work will be completed in 2020, though it may be delayed. As previously reported, on June 29, 2000, the United States filed a complaint on behalf of the EPA against us in the U.S. District Court for the Southern District of Ohio, Case No. C-1-00530, alleging violations of the Clean Air Act, the Clean Water Act and RCRA at our Middletown Works. Subsequently, the State of Ohio, the Sierra Club and the National Resources Defense Council intervened. On May 15, 2006, the court entered a Consent Decree in Partial Resolution of Pending Claims (the “Consent Decree”). Under the Consent Decree, we agreed to undertake a comprehensive RCRA facility investigation at Middletown Works and, as appropriate, complete a corrective measures study. The Consent Decree also required us to implement certain RCRA corrective action interim measures. We have completed the remedial activity at Dicks Creek, but continue to work on the RCRA facility investigation and certain interim measures. We have accrued $12.3 for the cost of known work required under the Consent Decree for the RCRA facility investigation and remaining interim measures. As previously reported, on May 12, 2014, the Michigan Department of Environmental Quality (“MDEQ”) issued to our Dearborn Works an Air Permit to Install No. 182-05C (the “PTI”) to increase the emission limits for the blast furnace and other emission sources. The PTI was issued as a correction to a prior permit to install that did not include certain information during the prior permitting process. On July 10, 2014, the South Dearborn Environmental Improvement Association (“SDEIA”), Detroiters Working for Environmental Justice, Original United Citizens of Southwest Detroit and the Sierra Club filed a Claim of Appeal of the PTI in the State of Michigan, Wayne County Circuit, Case No. 14-008887-AA. Appellants and the MDEQ required the intervention of Severstal Dearborn, LLC (“Dearborn”) (now owned by us) in this action as an additional appellee. The appellants allege multiple deficiencies with the PTI and the permitting process. Until the appeal is resolved, we cannot determine what the ultimate permit limits will be. Until the permit limits are determined and final, we cannot reliably estimate the costs we may incur, if any, or when we may incur them. As previously reported, on August 21, 2014, the SDEIA filed a Complaint under the Michigan Environmental Protection Act (“MEPA”) in the State of Michigan, Wayne County Circuit Case No. 14-010875-CE. The plaintiffs allege that the air emissions from our Dearborn Works are impacting the air, water and other natural resources, as well as the public trust in such resources. The plaintiffs are requesting, among other requested relief, that the court assess and determine the sufficiency of the PTI’s limitations. On October 15, 2014, the court ordered a stay of the proceedings until a final order is issued in Wayne County Circuit Court Case No. 14-008887-AA (discussed above). When the proceedings resume, we will vigorously contest these claims. Until the claims in this Complaint are resolved, we cannot reliably estimate the costs we may incur, if any, or when we may incur them. As previously reported, on April 27, 2000, MDEQ issued RCRA Corrective Action Order No. 111-04-00-07E to Rouge Steel Company and Ford Motor Company for the property that includes our Dearborn Works. The Corrective Action Order has been amended five times. We are a party to the Corrective Action Order as the successor-in-interest to Dearborn, which was the successor-in-interest to Rouge Steel Company. The Corrective Action Order requires the site-wide investigation, and where appropriate, remediation of the facility. The site investigation and remediation are ongoing. We cannot reliably estimate how long it will take to complete this site investigation and remediation. To date, Ford Motor Company has incurred most of the costs of the investigation and remediation due to its prior ownership of the steelmaking operations at Dearborn Works. Until the site investigation is complete, we cannot reliably estimate the additional costs we may incur, if any, for any potentially required remediation of the site or when we may incur them. As previously reported, we received an order in October 2002 from the EPA under Section 3013 of RCRA requiring us to investigate several areas of Zanesville Works that allegedly could be sources of contamination. A site investigation began in 2003 and was approved by EPA in November 2012. On October 28, 2016, the EPA requested that we conduct a corrective measures study and implement these measures as necessary. We subsequently agreed to proceed with a voluntary corrective measures study and have accrued $0.1 for the study. Until the study is complete, we cannot reliably estimate the costs, if any, we may incur for potential required remediation of the site or when we may incur them. In addition to the foregoing matters, we are or may be involved in proceedings with various regulatory authorities that may require us to pay fines, comply with more rigorous standards or other requirements or incur capital and operating expenses for environmental compliance. We believe that the ultimate disposition of the proceedings will not have, individually or in the aggregate, a material adverse effect on our consolidated financial condition, results of operations or cash flows. Legal Contingencies As previously reported, since 1990 we have been named as a defendant in numerous lawsuits alleging personal injury as a result of exposure to asbestos. The great majority of these lawsuits have been filed on behalf of people who claim to have been exposed to asbestos while visiting the premises of one of our current or former facilities. The majority of asbestos cases pending in which we are a defendant do not include a specific dollar claim for damages. In the cases that do include specific dollar claims for damages, the complaint typically includes a monetary claim for compensatory damages and a separate monetary claim in an equal amount for punitive damages, but does not attempt to allocate the total monetary claim among the various defendants. The number of asbestos cases pending at March 31, 2019 , is presented below: Asbestos Cases Pending at March 31, 2019 Cases with specific dollar claims for damages: Claims up to $0.2 164 Claims above $0.2 to $5.0 4 Claims above $5.0 to $20.0 3 Total claims with a specific dollar claim for damages (a) 171 Cases without a specific dollar claim for damages 176 Total asbestos cases pending 347 (a) Involve a total of 2,246 plaintiffs and 19,559 defendants In each case, the amount described is per plaintiff against all of the defendants, collectively. Thus, it usually is not possible at the outset of a case to determine the specific dollar amount of a claim against us. In fact, it usually is not even possible at the outset to determine which of the plaintiffs actually will pursue a claim against us. Typically, that can only be determined through written interrogatories or other discovery after a case has been filed. Therefore, in a case involving multiple plaintiffs and multiple defendants, we initially only account for the lawsuit as one claim. After we have determined through discovery whether a particular plaintiff will pursue a claim, we make an appropriate adjustment to statistically account for that specific claim. It has been our experience that only a small percentage of asbestos plaintiffs ultimately identify us as a target defendant from whom they actually seek damages and most of these claims ultimately are either dismissed or settled for a small fraction of the damages initially claimed. Asbestos-related claims information for the three months ended March 31, 2019 and 2018 is presented below: Three Months Ended March 31, 2019 2018 New Claims Filed 11 12 Pending Claims Disposed Of 7 11 Total Amount Paid in Settlements $ 0.2 $ 0.3 Since the onset of asbestos claims against us in 1990, five asbestos claims against us have proceeded to trial in four separate cases. All five concluded with a verdict in our favor. We continue to vigorously defend the asbestos claims. Based upon present knowledge, and the factors above, we believe it is unlikely that the resolution in the aggregate of the asbestos claims against us will have a materially adverse effect on our consolidated results of operations, cash flows or financial condition. However, predictions about the outcome of pending litigation, particularly claims alleging asbestos exposure, are subject to substantial uncertainties. These uncertainties include (1) the significantly variable rate at which new claims may be filed, (2) the effect of bankruptcies of other companies currently or historically defending asbestos claims, (3) the litigation process from jurisdiction to jurisdiction and from case to case, (4) the type and severity of the disease each claimant is alleged to suffer, and (5) the potential for enactment of legislation affecting asbestos litigation. As previously reported, on January 20, 2010, ArcelorMittal France and ArcelorMittal Atlantique et Lorraine (collectively “ArcelorMittal”) filed an action in the United States District Court for the District of Delaware, Case No. 10-050-SLR against us, Dearborn, and Wheeling-Nisshin Inc., whom Dearborn indemnified in this action. By virtue of our responsibility as a successor-in-interest to Dearborn and an indemnitor of Wheeling-Nisshin Inc., we now have complete responsibility for the defense of this action. The three named defendants are collectively referred to hereafter as “we” or “us”, though the precise claims against each separate defendant may vary. The complaint alleges that we are infringing the claims of U.S. Patent No. 6,296,805 (the “Patent”) in making pre-coated cold-rolled boron steel sheet and seeks injunctive relief and unspecified compensatory damages. We filed an answer denying ArcelorMittal’s claims and raised various affirmative defenses. We also filed counterclaims against ArcelorMittal for a declaratory judgment that we are not infringing the Patent and that the Patent is invalid. Subsequently, the trial court separated the issues of liability and damages. The case proceeded with a trial to a jury on the issue of liability during the week of January 15, 2011. The jury returned a verdict that we did not infringe the Patent and that the Patent was invalid. Judgment then was entered in our favor. ArcelorMittal filed an appeal with the United States Court of Appeals for the Federal Circuit. On November 30, 2012, the court of appeals issued a decision reversing certain findings related to claim construction and the validity of the Patent and remanded the case to the trial court for further proceedings. On January 30, 2013, ArcelorMittal filed a motion for rehearing with the court of appeals. On March 20, 2013, the court of appeals denied ArcelorMittal’s motion for rehearing. The case then was remanded to the trial court for further proceedings. On April 16, 2013, according to a petition previously filed by ArcelorMittal and ArcelorMittal USA LLC, the U.S. Patent and Trademark Office (“PTO”) reissued the Patent as U.S. Reissue Patent RE44,153 (the “Reissued Patent”). Also on April 16, 2013, ArcelorMittal filed a second action against us in the United States District Court for the District of Delaware, Case Nos. 1:13-cv-00685 and 1:13-cv-00686 (collectively the “Second Action”). The complaint filed in the Second Action alleges that we are infringing the claims of the Reissued Patent and seeks injunctive relief and unspecified compensatory damages. On April 23, 2013, we filed a motion to dismiss key elements of the complaint filed in the Second Action. In addition, the parties briefed related non-infringement and claims construction issues in the original action. On October 25, 2013, the district court granted summary judgment in our favor, confirming that our product does not infringe the original Patent or the Reissued Patent. The court further ruled that ArcelorMittal’s Reissued Patent was invalid due to ArcelorMittal’s deliberate violation of a statutory prohibition on broadening a patent through reissue more than two years after the original Patent was granted and that the original Patent had been surrendered when the Reissued Patent was issued and thus is no longer in effect. Final Judgment was entered on October 31, 2013. On November 6, 2013, ArcelorMittal filed a motion to clarify or, in the alternative, to alter or amend the October 31, 2013 judgment. We opposed the motion. On December 5, 2013, the court issued a memorandum and order denying the motion and entered final judgment in our favor, and against ArcelorMittal, specifically ruling that all claims of ArcelorMittal’s Reissued Patent are invalid as violative of 35 U.S.C. §251(d). On December 30, 2013, ArcelorMittal filed notices of appeal to the Federal Circuit Court of Appeals. On May 12, 2015, the Federal Circuit issued its decision affirming in part and reversing in part the trial court’s decision and remanding the case for further proceedings. The Federal Circuit ruled that 23 of the 25 claims of the Reissued Patent were improperly broadened and therefore invalid. However, the Federal Court found that the district court erred in invalidating the remaining two claims and remanded the case for further proceedings before the district court. Following the remand, ArcelorMittal filed a motion in the trial court for leave to amend the Second Action to assert additional patent infringement claims based on another, related patent that the PTO issued on June 10, 2014, No. RE44,940 (Second Reissue Patent). It also filed a motion to dismiss the original action on the grounds that it is now moot in light of the Court of Appeals’ last ruling. We opposed both of those motions. In addition, we filed separate motions for summary judgment in the original action on the grounds of non-infringement and invalidity. A hearing on all motions was held on October 27, 2015. On December 4, 2015, the district court issued an order granting our motion for summary judgment that neither of the remaining claims of the Reissued Patent are infringed and both are invalid as obvious. The court therefore entered final judgment in favor of the defendants in the original case. In the court’s order, the judge also granted ArcelorMittal’s motion to file a first amended complaint and ArcelorMittal did file an amended complaint in Case No. 1:13-cv-00685 (“685 Action”) alleging we are infringing the claims of the Second Reissue Patent, which we deny. On December 21, 2015, ArcelorMittal filed a notice of appeal from the district court’s December 4, 2015 final judgment. On May 16, 2017, the Federal Circuit Court of Appeals affirmed the district court’s judgment of invalidity and non-infringement of the reissued Patent. On June 14, 2017, ArcelorMittal filed a petition to the Federal Circuit for rehearing en banc of the May 16, 2017 decision. On August 14, 2017, the Federal Court of Appeals denied ArcelorMittal’s petition for rehearing en banc. On January 20, 2016, we filed a motion to dismiss the amended complaint in the 685 Action, or in the alternative, a motion to stay pending a resolution of the appeal in the original case. On April 19, 2016, the district court issued an order denying our motion and ordering limited discovery. Following discovery, on August 17, 2016, we filed a motion for summary judgment on the basis that the claims in the 685 Action are precluded by the judgment in the original case. On January 19, 2017, the district court issued an opinion granting summary judgment in our favor in the 685 Action on the grounds of non-infringement and also entered a final judgment on that basis. On February 14, 2017, ArcelorMittal filed a notice of appeal of the district court’s order in the Federal Circuit Court of Appeals. On November 5, 2018, the Federal Court of Appeals issued a decision vacating the judgment of non-infringement entered by the district court. The decision remands the case back to the district court for further proceedings. We intend to continue to contest this matter vigorously. We have not made a determination that a loss is probable and we do not have adequate information to reliably or accurately estimate a potential loss if ArcelorMittal prevails on remand. Because we have been unable to determine that the potential loss in this case is probable or estimable, we have not recorded an accrual for this matter. If our assumptions used to evaluate whether a loss in this matter is either probable or estimable prove to be incorrect or change, we may be required to record a liability for an adverse outcome. Other Contingencies In addition to the matters discussed above, there are various pending and potential claims against us and our subsidiaries involving product liability, commercial, employee benefits and other matters arising in the ordinary course of business. Because of the considerable uncertainties which exist for any claim, it is difficult to reliably or accurately estimate what would be the amount of a loss if a claimant prevails. If material assumptions or factual understandings we rely on to evaluate exposure for these contingencies prove to be inaccurate or otherwise change, we may be required to record a liability for an adverse outcome. If, however, we have reasonably evaluated potential future liabilities for all of these contingencies,

Share-based Compensation (Notes

Share-based Compensation (Notes)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation	Share-based Compensation AK Holding’s Stock Incentive Plan (“SIP”) permits the granting of nonqualified stock option, restricted stock, performance share and restricted stock unit awards to our Directors, officers and other employees. We have estimated share-based compensation expense to be $9.5 for 2019 . Information on share-based compensation expense is presented below: Three Months Ended March 31, Share-based Compensation Expense 2019 2018 Stock options $ 1.7 $ 1.7 Restricted stock 1.5 1.9 Restricted stock units issued to Directors 0.3 0.3 Performance shares 0.6 0.5 Equity-based long-term performance plan 0.2 0.1 Total share-based compensation expense $ 4.3 $ 4.5 We granted stock options on 1,199,415 shares during the three months ended March 31, 2019 , with a weighted-average fair value of $1.52 per share of stock option. No options were exercised during the three months ended March 31, 2019 . We granted restricted stock awards of 768,304 shares during the three months ended March 31, 2019 , at a weighted-average fair value of $2.66 per share. The total intrinsic value of restricted stock awards that vested (i.e., restrictions lapsed) during the three months ended March 31, 2019 was $1.9 . We granted performance share awards of 595,733 shares during the three months ended March 31, 2019 , with a weighted-average fair value of $3.09 per share. The total intrinsic value of performance share awards that vested during the three months ended March 31, 2019 was $0.7 . During the first quarter of 2019, in order to further align our management and stockholder interests, the Board of Directors changed the structure of long-term incentive compensation for executive officers. For performance periods beginning in 2019, 50% of the long-term incentive plan compensation earned by executive officers will now be denominated in stock instead of the 30% denominated in stock for performance periods beginning in 2018. In addition, beginning in 2019, 30% of the compensation earned by other participants under the long-term incentive plan will now be paid in stock. The remaining portion of the long-term incentive plan for all participants will be settled in cash. As a result, the equity-based portion of the long-term incentive plan is treated as share-based compensation with a performance condition.

Comprehensive Income (Loss) (No

Comprehensive Income (Loss) (Notes)	3 Months Ended
	Mar. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss)	Comprehensive Income (Loss) Other comprehensive income (loss), net of tax, information is presented below: Three Months Ended March 31, 2019 2018 Foreign currency translation Balance at beginning of period $ (0.6 ) $ 1.1 Other comprehensive income (loss)—foreign currency translation gain (loss) (0.7 ) 1.1 Balance at end of period $ (1.3 ) $ 2.2 Cash flow hedges Balance at beginning of period $ 7.2 $ 22.3 Cumulative effect of adopting new hedging standard — 0.8 Other comprehensive income (loss): Gains (losses) arising in period 7.4 (1.4 ) Income tax expense (benefit) (b) — — Gains (losses) arising in period, net of tax 7.4 (1.4 ) Reclassification of losses (gains) to net income: Recorded in cost of products sold (6.4 ) (7.6 ) Income tax (expense) benefit (b) — — Net amount of reclassification of losses (gains) to net income, net of tax (6.4 ) (7.6 ) Total other comprehensive income (loss), net of tax 1.0 (9.0 ) Balance at end of period $ 8.2 $ 14.1 Pension and OPEB plans Balance at beginning of period $ (106.6 ) $ (73.6 ) Reclassification to net income: Prior service costs (credits) (a) (2.6 ) (2.4 ) Actuarial (gains) losses (a) (2.6 ) 3.6 Subtotal (5.2 ) 1.2 Income tax (expense) benefit (b) — — Amount of reclassification to net income, net of tax (5.2 ) 1.2 Total other comprehensive income (loss), net of tax (5.2 ) 1.2 Balance at end of period $ (111.8 ) $ (72.4 ) (a) Included in pension and OPEB (income) expense (b)

Earnings Per Share (Notes)

Earnings Per Share (Notes)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share Earnings per share are calculated using the “two-class” method. Under the “two-class” method, undistributed earnings are allocated to both common shares and participating securities. We divide the sum of distributed earnings to common stockholders and undistributed earnings to common stockholders by the weighted-average number of common shares outstanding during the period. The restricted stock granted by AK Holding is entitled to dividends before vesting and meets the criteria of a participating security. Three Months Ended March 31, 2019 2018 Net income (loss) attributable to AK Steel Holding Corporation $ (4.5 ) $ 28.7 Less: distributed earnings to common stockholders and holders of certain stock compensation awards — — Undistributed earnings $ (4.5 ) $ 28.7 Common stockholders earnings—basic and diluted: Distributed earnings to common stockholders $ — $ — Undistributed earnings to common stockholders (4.5 ) 28.6 Common stockholders earnings—basic and diluted $ (4.5 ) $ 28.6 Common shares outstanding (weighted-average shares in millions): Common shares outstanding for basic earnings per share 315.6 314.7 Effect of exchangeable debt — 0.5 Effect of dilutive stock-based compensation — 0.8 Common shares outstanding for diluted earnings per share 315.6 316.0 Basic earnings per share: Distributed earnings $ — $ — Undistributed earnings (0.01 ) 0.09 Basic earnings per share $ (0.01 ) $ 0.09 Diluted earnings per share: Distributed earnings $ — $ — Undistributed earnings (0.01 ) 0.09 Diluted earnings per share $ (0.01 ) $ 0.09 Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect 3.5 2.2

Variable Interest Entities (Not

Variable Interest Entities (Notes)	3 Months Ended
	Mar. 31, 2019
Variable Interest Entity, Primary Beneficiary, Does Not Hold Majority Voting Interest, Disclosures [Abstract]
Variable Interest Entities	Variable Interest Entities SunCoke Middletown We purchase substantially all the coke and electrical power generated from SunCoke Middletown’s plant under long-term supply agreements. SunCoke Middletown is a consolidated variable interest entity because we have committed to purchase all the expected production from the facility through at least 2031 and we are the primary beneficiary. Therefore, we consolidate SunCoke Middletown’s financial results with our financial results, even though we have no ownership interest in SunCoke Middletown. SunCoke Middletown had income before income taxes of $12.7 and $16.2 for the three months ended March 31, 2019 and 2018 that was included in our consolidated income before income taxes. Vicksmetal/Armco Associates We indirectly own a 50% interest in Vicksmetal/Armco Associates (“VAA”), a joint venture with Vicksmetal Company. VAA slits electrical steel primarily for us, though it also does so for third parties. VAA is a consolidated variable interest entity and we are the primary beneficiary. Therefore, we consolidate VAA’s financial results with our financial results. During the first quarter, the owner of the other 50% equity interest in VAA transferred that interest to a third party.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We measure certain assets and liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. In determining fair value, we use various valuation approaches. The hierarchy of those valuation approaches is broken down into three levels based on the reliability of inputs as follows: • Level 1 inputs are quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date. • Level 2 inputs are inputs, other than quoted prices, that are directly or indirectly observable for the asset or liability. Level 2 inputs include model-generated values that rely on inputs either directly observed or readily-derived from available market data sources, such as Bloomberg or other news and data vendors. They include quoted prices for similar assets or liabilities in active markets, inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates and yield curves observable at commonly quoted intervals or current market) and contractual prices for the underlying financial instrument, as well as other relevant economic factors. As a practical expedient, we estimate the value of money market mutual funds by using a $1.00 per share multiplied by the number of shares in the fund as of the measurement date. We generate fair values for our commodity derivative contracts and foreign currency forward contracts from observable futures prices for the respective commodity or currency, from sources such as the New York Mercantile Exchange (NYMEX) or the London Metal Exchange (LME). We use the Black-Scholes option valuation model to value option contract derivatives (including caps, floors and collars). We use independent sources for implied volatilities, and we discount model-generated future values with discount factors that reflect the counterparty’s credit quality. We apply different discount rates to different contracts since the maturities and counterparties differ. As of March 31, 2019 , a spread over benchmark rates of less than 1% was used for derivatives valued as assets and a spread over benchmark rates of less than 3% was used for derivatives valued as liabilities. We have estimated the fair value of long-term debt based upon quoted market prices for the same or similar issues or on the current interest rates available to us for debt on similar terms and with similar maturities. • Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs are used to measure fair value if observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. This level of categorization is not applicable to our valuations on a normal, recurring basis. Assets and liabilities measured at fair value on a recurring basis are presented below: March 31, 2019 December 31, 2018 Level 1 Level 2 Total Level 1 Level 2 Total Assets measured at fair value Cash and cash equivalents $ 41.2 $ — $ 41.2 $ 48.6 $ — $ 48.6 Other current assets: Foreign exchange contracts — 0.2 0.2 — 0.1 0.1 Commodity hedge contracts — 26.1 26.1 — 13.0 13.0 Other non-current assets: Foreign exchange contracts — 0.3 0.3 — 0.4 0.4 Commodity hedge contracts — 6.3 6.3 — 2.9 2.9 Assets measured at fair value $ 41.2 $ 32.9 $ 74.1 $ 48.6 $ 16.4 $ 65.0 Liabilities measured at fair value Accrued liabilities: Foreign exchange contracts $ — $ (0.9 ) $ (0.9 ) $ — $ (1.2 ) $ (1.2 ) Commodity hedge contracts — (2.6 ) (2.6 ) — (5.9 ) (5.9 ) Other non-current liabilities: Foreign exchange contracts — (0.9 ) (0.9 ) — (1.5 ) (1.5 ) Commodity hedge contracts — (0.7 ) (0.7 ) — (1.6 ) (1.6 ) Liabilities measured at fair value $ — $ (5.1 ) $ (5.1 ) $ — $ (10.2 ) $ (10.2 ) Liabilities measured at other than fair value Long-term debt, including current portions: Fair value $ — $ (1,985.4 ) $ (1,985.4 ) $ — $ (1,852.4 ) $ (1,852.4 ) Carrying amount — (2,037.7 ) (2,037.7 ) — (1,993.7 ) (1,993.7 ) The carrying amounts of our other financial instruments do not differ materially from their estimated fair values at March 31, 2019 and December 31, 2018

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities Exchange rate fluctuations affect a portion of revenues and operating costs that are denominated in foreign currencies, and we use forward currency and currency option contracts to reduce our exposure to certain of these currency price fluctuations. Contracts to sell euros have not been designated as cash flow hedges for accounting purposes, and gains or losses are reported in earnings immediately in other (income) expense. Contracts to purchase Canadian dollars are designated as cash flow hedges for accounting purposes, and we record the gains and losses for the derivatives and premiums paid for option contracts in accumulated other comprehensive income (loss) until we reclassify them into cost of products sold when we recognize the associated underlying operating costs. We are exposed to fluctuations in market prices of raw materials and energy sources. We may use cash-settled commodity price swaps and options to hedge the market risk associated with the purchase of certain of our raw materials and energy requirements. For input commodities, these derivatives are typically used for a portion of our electricity, iron ore, natural gas and zinc requirements. Our hedging strategy is to reduce the effect on earnings from the price volatility of these various commodity exposures, including timing differences between when we incur raw material commodity costs and when we receive sales surcharges from our customers based on those raw materials. Independent of any hedging activities, price changes in any of these commodity markets could negatively affect operating costs. All commodity derivatives are recognized as an asset or liability at fair value. We record the gains and losses and premiums paid for option contracts for commodity derivatives designated as cash flow hedges of forecasted purchases of raw materials and energy sources in accumulated other comprehensive income (loss) and reclassify them into cost of products sold when we recognize earnings for the associated underlying transaction. We record all gains or losses from commodity derivatives for which hedge accounting treatment has not been elected to earnings immediately in cost of products sold. We have provided no collateral to counterparties under collateral funding arrangements as of March 31, 2019 . Outstanding derivative contracts and the period over which we are hedging our exposure to the volatility in future cash flows are presented below: Derivative Contracts Settlement Dates March 31, December 31, Commodity contracts: Natural gas (in MMBTUs) April 2019 to March 2021 43,525,000 39,868,000 Zinc (in lbs) April 2019 to December 2020 54,450,000 52,150,000 Iron ore (in metric tons) April 2019 to December 2020 1,955,000 2,125,000 Electricity (in MWHs) April 2019 to December 2020 1,440,000 1,461,000 Foreign exchange contracts: Euros (in millions) April 2019 to June 2019 € 7.0 € 4.0 Canadian dollars (in millions) April 2019 to December 2021 C$ 128.1 C$ 118.6 The fair value of derivative instruments in the condensed consolidated balance sheets is presented below: Asset (liability) March 31, December 31, Derivatives designated as cash flow hedges: Other current assets: Foreign exchange contracts $ 0.1 $ — Commodity contracts 7.9 3.4 Other non-current assets: Foreign exchange contracts 0.3 0.4 Commodity contracts 0.8 1.0 Accrued liabilities: Foreign exchange contracts (0.9 ) (1.2 ) Commodity contracts (2.3 ) (4.7 ) Other non-current liabilities: Foreign exchange contracts (0.9 ) (1.5 ) Commodity contracts (0.7 ) (1.2 ) Derivatives not designated as cash flow hedges: Other current assets: Foreign exchange contracts 0.1 0.1 Commodity contracts 18.2 9.6 Other non-current assets—commodity contracts 5.5 1.9 Accrued liabilities—commodity contracts (0.3 ) (1.2 ) Other non-current liabilities—commodity contracts — (0.4 ) Gains (losses) on derivative instruments included in the condensed consolidated statements of operations and comprehensive income (loss) are presented below: Three Months Ended March 31, 2019 2018 Gain (loss) Derivatives designated as cash flow hedges: Commodity contracts: Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness $ 6.8 $ 0.3 Reclassified from accumulated other comprehensive income into cost of products sold 6.7 7.6 Foreign exchange contracts: Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness 0.6 (1.7 ) Reclassified from accumulated other comprehensive income into cost of products sold (0.3 ) — Derivatives not designated as cash flow hedges: Commodity contracts—recognized in cost of products sold 20.5 (8.7 ) Foreign exchange contracts—recognized in other income (expense) (0.1 ) (0.3 ) We routinely use iron ore derivatives to reduce the volatility of the cost of our iron ore purchases. These derivatives do not qualify for hedge accounting treatment. Therefore, adjustments to mark these derivatives to fair value each period are recognized immediately in our financial results versus being recognized in the period that iron ore purchases affect earnings. For the three months ended March 31, 2019 , gains (losses) recognized in cost of products sold shown in the table above include $21.8 for unrealized mark-to-market gains (losses) on iron ore derivatives. Gains (losses) recognized in cost of products sold shown in the table above for unrealized mark-to-market gains (losses) on iron ore derivatives for the corresponding period in 2018 include $(7.7) . Not included in the financial results for the three months ended March 31, 2019 , were realized gains of $4.7 for iron ore derivatives contracts that settled during the period for which we had recognized mark-to-market gains in our financial results in prior quarters, compared to $2.3 for the same period in 2018 . Gains (losses) before tax expected to be reclassified into cost of products sold within the next twelve months for our existing derivatives that qualify as cash flow hedges for hedge accounting are presented below: Hedge Gains (losses) Natural gas $ (1.5 ) Zinc 4.0 Electricity (0.5 ) Canadian dollars (1.7 )

Supplementary Cash Flow Informa

Supplementary Cash Flow Information (Notes)	3 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Information [Abstract]
Supplementary Cash Flow Information	Supplementary Cash Flow Information Net cash paid (received) during the period for interest, net of capitalized interest, and income taxes are presented below: Three Months Ended March 31, 2019 2018 Net cash paid (received) during the period for: Interest, net of capitalized interest $ 33.7 $ 32.8 Income taxes 2.1 (7.5 ) Included in net cash flows from operations was cash provided by SunCoke Middletown of $7.0 and $21.5 for the three months ended March 31, 2019 and 2018 . Consolidated cash and cash equivalents at March 31, 2019 and December 31, 2018 , include SunCoke Middletown’s cash and cash equivalents of $0.3 and $1.1 . SunCoke Middletown’s cash and cash equivalents have no compensating balance arrangements or legal restrictions, but are not available for our use. We had capital investments during the three months ended March 31, 2019 and 2018 that had not been paid as of the end of the respective period. These amounts are included in accounts payable and accrued liabilities and have been excluded from the condensed consolidated statements of cash flows until paid. We also grant restricted stock to certain employees and restricted stock units to directors under the SIP. Non-cash investing and financing activities are presented below: Three Months Ended March 31, 2019 2018 Capital investments $ 17.8 $ 20.0 Issuance of restricted stock and restricted stock units 2.3 3.7

Labor Agreements (Notes)

Labor Agreements (Notes)	3 Months Ended
	Mar. 31, 2019
Union Contracts [Abstract]
Union Contracts	Labor Agreements On April 18, 2019, we and the United Steelworkers, Local 1865 , which represents approximately 230 production employees at Ashland Works, reached an agreement to revise and extend the collective bargaining agreement. The new agreement includes terms governing the permanent shut down of the facility, including benefits to employees who are terminated or transition to other plants within the company. In February 2019, we and the United Steelworkers, Local 1190 , which governs approximately 240 production employees at Mountain State Carbon LLC, agreed to extend the current labor agreement, originally scheduled to expire on March 1, 2019 , to May 1, 2019 . An agreement with the United Auto Workers, Local 3303 , which governs approximately 1,150 production employees at Butler Works, expired on April 15, 2019 . The parties are continuing to negotiate the terms of a new contract and are currently working under the terms of the old agreement while negotiations continue. An agreement with the United Auto Workers, Local 4104 , which governs approximately 110 production employees at Zanesville Works, is scheduled to expire on May 31, 2019 . An agreement with the United Auto Workers, Local 3462 , which governs approximately 310 production employees at Coshocton Works, is scheduled to expire on September 30, 2019

New Accounting Pronouncements (

New Accounting Pronouncements (Notes)	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles	New Accounting Pronouncements We adopted Accounting Standards Update No. 2016-02, Leases (Topic 842) , as subsequently amended, as of January 1, 2019 through the modified retrospective method applied to those contracts that were not completed as of January 1, 2019. Topic 842 requires entities to recognize lease assets and lease liabilities and disclose key information about leasing arrangements for certain leases. Results for reporting periods beginning after January 1, 2019 are presented under Topic 842, while prior period amounts have not been adjusted and continue to be reported in accordance with our historical accounting treatment. We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. We also elected the practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements. Adoption of the new standard resulted in recording additional lease assets and liabilities of $291.1

Supplementary Guarantor Informa

Supplementary Guarantor Information (Notes)	3 Months Ended
	Mar. 31, 2019
Supplemental Guarantor Information [Abstract]
Supplementary Guarantor Information	Supplementary Guarantor Information AK Steel’s senior secured notes due 2023 and senior unsecured notes due 2021, 2025 and 2027 (collectively, the “Senior Notes”) and its Exchangeable Notes due 2019 are governed by indentures entered into by AK Holding and its 100%-owned subsidiary, AK Steel. Under the terms of the Senior Notes’ indentures, AK Holding and certain subsidiary guarantors each fully and unconditionally, jointly and severally, guarantee the payment of interest, principal and premium, if any, on each of the notes included in the Senior Notes. Under the terms of the indenture for the Exchangeable Notes, AK Holding fully and unconditionally, jointly and severally, guarantees the payment of interest, principal and premium, if any, on the Exchangeable Notes. AK Holding is the sole guarantor of the Exchangeable Notes. We present all investments in subsidiaries in the supplementary guarantor information using the equity method of accounting. Therefore, the net income (loss) of the subsidiaries accounted for using the equity method is in their parents’ investment accounts. The principal elimination entries eliminate investments in subsidiaries and inter-company balances and transactions. The following supplementary condensed consolidating financial statements present information about AK Holding, AK Steel, the subsidiary guarantors of the Senior Notes and the other non-guarantor subsidiaries. Condensed Consolidated Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net sales $ — $ 1,549.4 $ 83.5 $ 185.4 $ (120.6 ) $ 1,697.7 Cost of products sold (exclusive of items shown separately below) — 1,362.0 59.3 151.9 (107.8 ) 1,465.4 Selling and administrative expenses 1.4 73.8 3.9 9.7 (12.2 ) 76.6 Depreciation — 35.7 2.1 12.6 — 50.4 Ashland Works closure — 64.1 — — — 64.1 Total operating costs 1.4 1,535.6 65.3 174.2 (120.0 ) 1,656.5 Operating profit (loss) (1.4 ) 13.8 18.2 11.2 (0.6 ) 41.2 Interest expense — 36.3 — 1.6 — 37.9 Pension and OPEB (income) expense — 6.5 6.5 Other (income) expense — (6.6 ) (5.0 ) (1.1 ) — (12.7 ) Income (loss) before income taxes (1.4 ) (22.4 ) 23.2 10.7 (0.6 ) 9.5 Income tax expense (benefit) — (4.6 ) 5.8 0.4 (0.2 ) 1.4 Equity in net income (loss) of subsidiaries (3.1 ) 14.7 — 0.1 (11.7 ) — Net income (loss) (4.5 ) (3.1 ) 17.4 10.4 (12.1 ) 8.1 Less: Net income attributable to noncontrolling interests — — — 12.6 — 12.6 Net income (loss) attributable to AK Steel Holding Corporation (4.5 ) (3.1 ) 17.4 (2.2 ) (12.1 ) (4.5 ) Other comprehensive income (loss) (4.9 ) (4.9 ) — (0.7 ) 5.6 (4.9 ) Comprehensive income (loss) attributable to AK Steel Holding Corporation $ (9.4 ) $ (8.0 ) $ 17.4 $ (2.9 ) $ (6.5 ) $ (9.4 ) Condensed Consolidated Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net sales $ — $ 1,503.0 $ 77.1 $ 208.7 $ (129.9 ) $ 1,658.9 Cost of products sold (exclusive of item shown separately below) — 1,353.4 54.6 171.7 (116.0 ) 1,463.7 Selling and administrative expenses 1.3 74.9 3.6 8.7 (11.8 ) 76.7 Depreciation — 43.4 2.0 9.5 — 54.9 Total operating costs 1.3 1,471.7 60.2 189.9 (127.8 ) 1,595.3 Operating profit (loss) (1.3 ) 31.3 16.9 18.8 (2.1 ) 63.6 Interest expense — 36.4 — 1.2 — 37.6 Pension and OPEB (income) expense — (10.0 ) — — — (10.0 ) Other (income) expense — 1.2 (3.5 ) (1.6 ) — (3.9 ) Income (loss) before income taxes (1.3 ) 3.7 20.4 19.2 (2.1 ) 39.9 Income tax expense (benefit) — (11.9 ) 5.1 2.4 (0.5 ) (4.9 ) Equity in net income (loss) of subsidiaries 30.0 14.4 — — (44.4 ) — Net income (loss) 28.7 30.0 15.3 16.8 (46.0 ) 44.8 Less: Net income attributable to noncontrolling interests — — — 16.1 — 16.1 Net income (loss) attributable to AK Steel Holding Corporation 28.7 30.0 15.3 0.7 (46.0 ) 28.7 Other comprehensive income (loss) (6.7 ) (6.7 ) — 1.1 5.6 (6.7 ) Comprehensive income (loss) attributable to AK Steel Holding Corporation $ 22.0 $ 23.3 $ 15.3 $ 1.8 $ (40.4 ) $ 22.0 Condensed Consolidated Balance Sheets March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company ASSETS Current assets: Cash and cash equivalents $ — $ 20.5 $ 4.6 $ 16.1 $ — $ 41.2 Accounts receivable, net — 591.5 39.5 111.9 (22.3 ) 720.6 Inventory — 1,255.1 55.7 77.8 (9.8 ) 1,378.8 Other current assets — 74.6 0.1 14.1 — 88.8 Total current assets — 1,941.7 99.9 219.9 (32.1 ) 2,229.4 Property, plant and equipment — 6,129.3 191.3 675.8 — 6,996.4 Accumulated depreciation — (4,821.7 ) (104.9 ) (180.1 ) — (5,106.7 ) Property, plant and equipment, net — 1,307.6 86.4 495.7 — 1,889.7 Investment in subsidiaries (3,105.0 ) 1,966.6 — 68.3 1,070.1 — Inter-company accounts 3,199.0 — 1,669.5 — (4,868.5 ) — Operating lease assets — 222.2 2.9 28.9 — 254.0 Other non-current assets — 57.1 32.9 307.0 — 397.0 TOTAL ASSETS $ 94.0 $ 5,495.2 $ 1,891.6 $ 1,119.8 $ (3,830.5 ) $ 4,770.1 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 690.7 $ 29.3 $ 62.5 $ (14.3 ) $ 768.2 Accrued liabilities — 194.6 6.9 23.7 — 225.2 Current portion of operating lease liabilities — 52.9 0.9 2.3 — 56.1 Current portion of pension and other postretirement benefit obligations — 37.9 — 0.3 — 38.2 Total current liabilities — 976.1 37.1 88.8 (14.3 ) 1,087.7 Non-current liabilities: Long-term debt — 2,037.7 — — — 2,037.7 Long-term operating lease liabilities — 190.8 1.9 27.6 — 220.3 Pension and other postretirement benefit obligations — 821.5 — 2.7 — 824.2 Inter-company accounts — 4,431.9 — 515.2 (4,947.1 ) — Other non-current liabilities — 142.2 0.2 28.0 — 170.4 TOTAL LIABILITIES — 8,600.2 39.2 662.3 (4,961.4 ) 4,340.3 Equity: Total stockholders’ equity (deficit) 94.0 (3,105.0 ) 1,852.4 121.7 1,130.9 94.0 Noncontrolling interests — — — 335.8 — 335.8 TOTAL EQUITY 94.0 (3,105.0 ) 1,852.4 457.5 1,130.9 429.8 TOTAL LIABILITIES AND EQUITY $ 94.0 $ 5,495.2 $ 1,891.6 $ 1,119.8 $ (3,830.5 ) $ 4,770.1 Condensed Consolidated Balance Sheets December 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company ASSETS Current assets: Cash and cash equivalents $ — $ 22.1 $ 8.2 $ 18.3 $ — $ 48.6 Accounts receivable, net — 515.4 34.0 95.3 (8.9 ) 635.8 Inventory — 1,299.6 53.9 75.6 (9.2 ) 1,419.9 Other current assets — 85.5 0.1 11.4 — 97.0 Total current assets — 1,922.6 96.2 200.6 (18.1 ) 2,201.3 Property, plant and equipment — 6,111.1 189.7 668.4 — 6,969.2 Accumulated depreciation — (4,785.5 ) (102.8 ) (169.3 ) — (5,057.6 ) Property, plant and equipment, net — 1,325.6 86.9 499.1 — 1,911.6 Investment in subsidiaries (3,017.4 ) 1,931.1 — 68.2 1,018.1 — Inter-company accounts 3,117.3 — 1,630.7 — (4,748.0 ) — Other non-current assets — 54.3 32.9 315.6 — 402.8 TOTAL ASSETS $ 99.9 $ 5,233.6 $ 1,846.7 $ 1,083.5 $ (3,748.0 ) $ 4,515.7 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 722.5 $ 26.2 $ 55.5 $ (3.2 ) $ 801.0 Accrued liabilities — 251.5 8.7 28.7 — 288.9 Current portion of pension and other postretirement benefit obligations — 38.4 — 0.3 — 38.7 Total current liabilities — 1,012.4 34.9 84.5 (3.2 ) 1,128.6 Non-current liabilities: Long-term debt — 1,993.7 — — — 1,993.7 Pension and other postretirement benefit obligations — 827.0 — 2.9 — 829.9 Inter-company accounts — 4,312.3 — 511.2 (4,823.5 ) — Other non-current liabilities — 105.6 0.2 28.2 — 134.0 TOTAL LIABILITIES — 8,251.0 35.1 626.8 (4,826.7 ) 4,086.2 Equity: Total stockholders’ equity (deficit) 99.9 (3,017.4 ) 1,811.6 127.1 1,078.7 99.9 Noncontrolling interests — — — 329.6 — 329.6 TOTAL EQUITY 99.9 (3,017.4 ) 1,811.6 456.7 1,078.7 429.5 TOTAL LIABILITIES AND EQUITY $ 99.9 $ 5,233.6 $ 1,846.7 $ 1,083.5 $ (3,748.0 ) $ 4,515.7 Condensed Consolidated Statements of Cash Flows Three Months Ended March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net cash flows from operating activities $ (1.1 ) $ (35.7 ) $ 13.0 $ 13.4 $ 2.5 $ (7.9 ) Cash flows from investing activities: Capital investments — (32.9 ) (1.2 ) (10.7 ) — (44.8 ) Other investing items, net — 11.6 — — — 11.6 Net cash flows from investing activities — (21.3 ) (1.2 ) (10.7 ) — (33.2 ) Cash flows from financing activities: Net borrowings (payments) under credit facility — 45.0 — — — 45.0 Redemption of long-term debt — (4.0 ) — — — (4.0 ) Inter-company activity 1.1 15.3 (15.4 ) 1.5 (2.5 ) — SunCoke Middletown distributions to noncontrolling interest owners — — — (6.4 ) — (6.4 ) Other financing items, net — (0.9 ) — — — (0.9 ) Net cash flows from financing activities 1.1 55.4 (15.4 ) (4.9 ) (2.5 ) 33.7 Net increase (decrease) in cash and cash equivalents — (1.6 ) (3.6 ) (2.2 ) — (7.4 ) Cash and equivalents, beginning of period — 22.1 8.2 18.3 — 48.6 Cash and equivalents, end of period $ — $ 20.5 $ 4.6 $ 16.1 $ — $ 41.2 Condensed Consolidated Statements of Cash Flows Three Months Ended March 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net cash flows from operating activities $ (1.0 ) $ 45.7 $ 4.8 $ 11.1 $ 5.0 $ 65.6 Cash flows from investing activities: Capital investments — (31.4 ) (0.9 ) (5.6 ) — (37.9 ) Other investing items, net — — — — — — Net cash flows from investing activities — (31.4 ) (0.9 ) (5.6 ) — (37.9 ) Cash flows from financing activities: Net borrowings (payments) under credit facility — (10.0 ) — — — (10.0 ) Redemption of long-term debt — — — — — — Inter-company activity 2.0 (6.2 ) (7.0 ) 16.2 (5.0 ) — SunCoke Middletown distributions to noncontrolling interest owners — — — (10.3 ) — (10.3 ) Other financing items, net (1.0 ) 0.1 — — — (0.9 ) Net cash flows from financing activities 1.0 (16.1 ) (7.0 ) 5.9 (5.0 ) (21.2 ) Net increase (decrease) in cash and cash equivalents — (1.8 ) (3.1 ) 11.4 — 6.5 Cash and equivalents, beginning of period — 14.5 7.2 16.3 — 38.0 Cash and equivalents, end of period $ — $ 12.7 $ 4.1 $ 27.7 $ — $ 44.5

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy	Basis of Presentation— These financial statements consolidate the operations and accounts of AK Steel Holding Corporation (“AK Holding”), its wholly owned subsidiary AK Steel Corporation (“AK Steel”), all subsidiaries in which AK Holding has a controlling interest, and two variable interest entities for which AK Steel is the primary beneficiary. Unless the context provides otherwise, references to “we,” “us” and “our” refer to AK Holding and its subsidiaries. In our opinion, the accompanying condensed consolidated financial statements contain all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2019 and December 31, 2018 , our results of operations for the three months ended March 31, 2019 and 2018 , and our cash flows for the three months ended March 31, 2019 and 2018 . Our results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results we expect for the full year ending December 31, 2019 . These condensed consolidated financial statements should be read along with our audited consolidated financial statements for the year ended December 31, 2018 , included in our Annual Report on Form 10-K for the year ended December 31, 2018
Leases, Policy	Leases— We determine if an arrangement contains a lease at inception. We recognize right-of-use assets and liabilities associated with leases based on the present value of the future minimum lease payments over the lease term at the later of the commencement date of the lease or January 1, 2019 (the implementation date of Accounting Standards Update No. 2016-02, Leases (Topic 842)

Earnings Per Share (Policies)

Earnings Per Share (Policies)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share, Policy	Earnings per share are calculated using the “two-class” method. Under the “two-class” method, undistributed earnings are allocated to both common shares and participating securities. We divide the sum of distributed earnings to common stockholders and undistributed earnings to common stockholders by the weighted-average number of common shares outstanding during the period. The restricted stock granted by AK Holding is entitled to dividends before vesting and meets the criteria of a participating security.

Supplementary Financial State_2

Supplementary Financial Statement Information (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Disaggregation of Revenue	Net sales by market are presented below: Three Months Ended March 31, 2019 2018 Automotive $ 1,090.9 $ 1,119.1 Infrastructure and Manufacturing 278.1 241.3 Distributors and Converters 328.7 298.5 Total $ 1,697.7 $ 1,658.9 Net sales by product line are presented below: Three Months Ended March 31, 2019 2018 Carbon steel $ 1,099.2 $ 1,068.6 Stainless and electrical steel 444.5 426.1 Tubular products, components and other 154.0 164.2 Total $ 1,697.7 $ 1,658.9
Inventory	Inventories as of March 31, 2019 and December 31, 2018 , are presented below: March 31, December 31, Finished and semi-finished $ 1,021.9 $ 1,054.4 Raw materials 356.9 365.5 Inventory $ 1,378.8 $ 1,419.9
Schedule of Intangible Assets	Intangible assets at March 31, 2019 and December 31, 2018 , consist of: Gross Amount Accumulated Amortization Net Amount As of March 31, 201 9 Customer relationships $ 36.6 $ (8.7 ) $ 27.9 Technology 19.3 (5.3 ) 14.0 Intangible assets $ 55.9 $ (14.0 ) $ 41.9 As of December 31, 2018 Customer relationships $ 36.6 $ (7.4 ) $ 29.2 Technology 19.3 (4.6 ) 14.7 Intangible assets $ 55.9 $ (12.0 ) $ 43.9
Investments in Affiliates	Summarized financial statement data for all investees is presented below. Three Months Ended March 31, 2019 2018 Revenue $ 77.8 $ 74.8 Gross profit 21.5 21.1 Net income 2.7 4.2 Our share of income of equity investees (included in cost of products sold) 0.7 1.3

Long-term Debt and Other Fina_2

Long-term Debt and Other Financing (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Debt balances at March 31, 2019 and December 31, 2018 , are presented below: March 31, December 31, Credit Facility $ 380.0 $ 335.0 7.50% Senior Secured Notes due July 2023 (effective rate of 8.3%) 380.0 380.0 5.00% Exchangeable Senior Notes due November 2019 (effective rate of 10.8%) 148.5 148.5 7.625% Senior Notes due October 2021 406.2 406.2 6.375% Senior Notes due October 2025 (effective rate of 7.1%) 270.2 274.8 7.00% Senior Notes due March 2027 391.6 391.6 Industrial Revenue Bonds due 2020 through 2028 99.3 99.3 Unamortized debt discount and issuance costs (38.1 ) (41.7 ) Total long-term debt $ 2,037.7 $ 1,993.7

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lease, Cost [Table Text Block]	Lease costs are presented below: Three Months Ended March 31, 2019 Operating leases $ 16.7 Short-term leases 11.1 Variable lease costs 17.3 Total $ 45.1
Leases, Other Information [Table Text Block]	Other information related to leases was as follows: Three Months Ended March 31, 2019 Cash paid for operating cash flows from operating leases $ 18.1 Right-of-use assets obtained in exchange for operating lease liabilities 3.7 Weighted-average remaining lease term of operating leases (in years) 7.8 Weighted-average discount rate for operating leases 8.4 %
Lessee, Lease Liability, Maturity [Table Text Block]	Future minimum lease payments under noncancelable operating leases as of March 31, 2019 , were as follows: Year ending December 31: 2019 (remaining period of year) $ 53.3 2020 63.4 2021 50.8 2022 40.9 2023 34.8 Thereafter 148.2 Total future minimum operating lease payments 391.4 Less imputed interest 115.0 Total operating lease liabilities 276.4 Less current portion of operating lease liabilities 56.1 Long-term operating lease liabilities $ 220.3

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits, Description [Abstract]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit (income) expense for pension and other postretirement benefits was as follows: Three Months Ended March 31, 2019 2018 Pension Benefits Service cost $ 0.5 $ 0.8 Interest cost 22.3 23.7 Expected return on assets (28.0 ) (38.8 ) Amortization of prior service cost 0.7 1.0 Amortization of (gain) loss (1.7 ) 3.9 Termination benefits—Ashland Works 9.7 — Net periodic benefit (income) expense $ 3.5 $ (9.4 ) Other Postretirement Benefits Service cost $ 0.9 $ 1.1 Interest cost 4.1 3.9 Amortization of prior service cost (credit) (3.3 ) (3.4 ) Amortization of (gain) loss (0.9 ) (0.3 ) Termination benefits—Ashland Works 3.6 — Net periodic benefit (income) expense $ 4.4 $ 1.3

Environmental and Legal Conti_2

Environmental and Legal Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Accrual of Liabilities Related to Environmental Loss Contingencies	We have recorded the following liabilities for environmental matters on our condensed consolidated balance sheets: March 31, December 31, Accrued liabilities $ 7.3 $ 8.0 Other non-current liabilities 32.6 31.2
Schedule of Information on Pending Asbestos Cases	The number of asbestos cases pending at March 31, 2019 , is presented below: Asbestos Cases Pending at March 31, 2019 Cases with specific dollar claims for damages: Claims up to $0.2 164 Claims above $0.2 to $5.0 4 Claims above $5.0 to $20.0 3 Total claims with a specific dollar claim for damages (a) 171 Cases without a specific dollar claim for damages 176 Total asbestos cases pending 347 (a) Involve a total of 2,246 plaintiffs and 19,559 defendants
Schedule of Number of New Asbestos Claims Filed, Number of Pending Asbestos Claims Disposed, And Amount Paid in Settlements	Asbestos-related claims information for the three months ended March 31, 2019 and 2018 is presented below: Three Months Ended March 31, 2019 2018 New Claims Filed 11 12 Pending Claims Disposed Of 7 11 Total Amount Paid in Settlements $ 0.2 $ 0.3

Share-based Compensation (Table

Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule about share-based compensation expense	Information on share-based compensation expense is presented below: Three Months Ended March 31, Share-based Compensation Expense 2019 2018 Stock options $ 1.7 $ 1.7 Restricted stock 1.5 1.9 Restricted stock units issued to Directors 0.3 0.3 Performance shares 0.6 0.5 Equity-based long-term performance plan 0.2 0.1 Total share-based compensation expense $ 4.3 $ 4.5

Comprehensive Income (Loss) (Ta

Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of T ax	Other comprehensive income (loss), net of tax, information is presented below: Three Months Ended March 31, 2019 2018 Foreign currency translation Balance at beginning of period $ (0.6 ) $ 1.1 Other comprehensive income (loss)—foreign currency translation gain (loss) (0.7 ) 1.1 Balance at end of period $ (1.3 ) $ 2.2 Cash flow hedges Balance at beginning of period $ 7.2 $ 22.3 Cumulative effect of adopting new hedging standard — 0.8 Other comprehensive income (loss): Gains (losses) arising in period 7.4 (1.4 ) Income tax expense (benefit) (b) — — Gains (losses) arising in period, net of tax 7.4 (1.4 ) Reclassification of losses (gains) to net income: Recorded in cost of products sold (6.4 ) (7.6 ) Income tax (expense) benefit (b) — — Net amount of reclassification of losses (gains) to net income, net of tax (6.4 ) (7.6 ) Total other comprehensive income (loss), net of tax 1.0 (9.0 ) Balance at end of period $ 8.2 $ 14.1 Pension and OPEB plans Balance at beginning of period $ (106.6 ) $ (73.6 ) Reclassification to net income: Prior service costs (credits) (a) (2.6 ) (2.4 ) Actuarial (gains) losses (a) (2.6 ) 3.6 Subtotal (5.2 ) 1.2 Income tax (expense) benefit (b) — — Amount of reclassification to net income, net of tax (5.2 ) 1.2 Total other comprehensive income (loss), net of tax (5.2 ) 1.2 Balance at end of period $ (111.8 ) $ (72.4 ) (a) Included in pension and OPEB (income) expense (b)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings per share	Three Months Ended March 31, 2019 2018 Net income (loss) attributable to AK Steel Holding Corporation $ (4.5 ) $ 28.7 Less: distributed earnings to common stockholders and holders of certain stock compensation awards — — Undistributed earnings $ (4.5 ) $ 28.7 Common stockholders earnings—basic and diluted: Distributed earnings to common stockholders $ — $ — Undistributed earnings to common stockholders (4.5 ) 28.6 Common stockholders earnings—basic and diluted $ (4.5 ) $ 28.6 Common shares outstanding (weighted-average shares in millions): Common shares outstanding for basic earnings per share 315.6 314.7 Effect of exchangeable debt — 0.5 Effect of dilutive stock-based compensation — 0.8 Common shares outstanding for diluted earnings per share 315.6 316.0 Basic earnings per share: Distributed earnings $ — $ — Undistributed earnings (0.01 ) 0.09 Basic earnings per share $ (0.01 ) $ 0.09 Diluted earnings per share: Distributed earnings $ — $ — Undistributed earnings (0.01 ) 0.09 Diluted earnings per share $ (0.01 ) $ 0.09 Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect 3.5 2.2

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair value assets and liabilities measured on a recurring basis	Assets and liabilities measured at fair value on a recurring basis are presented below: March 31, 2019 December 31, 2018 Level 1 Level 2 Total Level 1 Level 2 Total Assets measured at fair value Cash and cash equivalents $ 41.2 $ — $ 41.2 $ 48.6 $ — $ 48.6 Other current assets: Foreign exchange contracts — 0.2 0.2 — 0.1 0.1 Commodity hedge contracts — 26.1 26.1 — 13.0 13.0 Other non-current assets: Foreign exchange contracts — 0.3 0.3 — 0.4 0.4 Commodity hedge contracts — 6.3 6.3 — 2.9 2.9 Assets measured at fair value $ 41.2 $ 32.9 $ 74.1 $ 48.6 $ 16.4 $ 65.0 Liabilities measured at fair value Accrued liabilities: Foreign exchange contracts $ — $ (0.9 ) $ (0.9 ) $ — $ (1.2 ) $ (1.2 ) Commodity hedge contracts — (2.6 ) (2.6 ) — (5.9 ) (5.9 ) Other non-current liabilities: Foreign exchange contracts — (0.9 ) (0.9 ) — (1.5 ) (1.5 ) Commodity hedge contracts — (0.7 ) (0.7 ) — (1.6 ) (1.6 ) Liabilities measured at fair value $ — $ (5.1 ) $ (5.1 ) $ — $ (10.2 ) $ (10.2 ) Liabilities measured at other than fair value Long-term debt, including current portions: Fair value $ — $ (1,985.4 ) $ (1,985.4 ) $ — $ (1,852.4 ) $ (1,852.4 ) Carrying amount — (2,037.7 ) (2,037.7 ) — (1,993.7 ) (1,993.7 )

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Outstanding commodity price swaps and options and forward foreign exchange contracts	Outstanding derivative contracts and the period over which we are hedging our exposure to the volatility in future cash flows are presented below: Derivative Contracts Settlement Dates March 31, December 31, Commodity contracts: Natural gas (in MMBTUs) April 2019 to March 2021 43,525,000 39,868,000 Zinc (in lbs) April 2019 to December 2020 54,450,000 52,150,000 Iron ore (in metric tons) April 2019 to December 2020 1,955,000 2,125,000 Electricity (in MWHs) April 2019 to December 2020 1,440,000 1,461,000 Foreign exchange contracts: Euros (in millions) April 2019 to June 2019 € 7.0 € 4.0 Canadian dollars (in millions) April 2019 to December 2021 C$ 128.1 C$ 118.6
Fair value of derivative instruments in the condensed consolidated balance sheets	The fair value of derivative instruments in the condensed consolidated balance sheets is presented below: Asset (liability) March 31, December 31, Derivatives designated as cash flow hedges: Other current assets: Foreign exchange contracts $ 0.1 $ — Commodity contracts 7.9 3.4 Other non-current assets: Foreign exchange contracts 0.3 0.4 Commodity contracts 0.8 1.0 Accrued liabilities: Foreign exchange contracts (0.9 ) (1.2 ) Commodity contracts (2.3 ) (4.7 ) Other non-current liabilities: Foreign exchange contracts (0.9 ) (1.5 ) Commodity contracts (0.7 ) (1.2 ) Derivatives not designated as cash flow hedges: Other current assets: Foreign exchange contracts 0.1 0.1 Commodity contracts 18.2 9.6 Other non-current assets—commodity contracts 5.5 1.9 Accrued liabilities—commodity contracts (0.3 ) (1.2 ) Other non-current liabilities—commodity contracts — (0.4 )
Gains (losses) on derivative instruments included in the condensed consolidated statements of operations	Gains (losses) on derivative instruments included in the condensed consolidated statements of operations and comprehensive income (loss) are presented below: Three Months Ended March 31, 2019 2018 Gain (loss) Derivatives designated as cash flow hedges: Commodity contracts: Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness $ 6.8 $ 0.3 Reclassified from accumulated other comprehensive income into cost of products sold 6.7 7.6 Foreign exchange contracts: Recognized in accumulated other comprehensive income that were included in the assessment of effectiveness 0.6 (1.7 ) Reclassified from accumulated other comprehensive income into cost of products sold (0.3 ) — Derivatives not designated as cash flow hedges: Commodity contracts—recognized in cost of products sold 20.5 (8.7 ) Foreign exchange contracts—recognized in other income (expense) (0.1 ) (0.3 )
Amount of gains (losses) expected to be reclassified into earnings within the next twelve months	Gains (losses) before tax expected to be reclassified into cost of products sold within the next twelve months for our existing derivatives that qualify as cash flow hedges for hedge accounting are presented below: Hedge Gains (losses) Natural gas $ (1.5 ) Zinc 4.0 Electricity (0.5 ) Canadian dollars (1.7 )

Supplementary Cash Flow Infor_2

Supplementary Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Information [Abstract]
Schedule of cash flow, supplemental disclosures	Net cash paid (received) during the period for interest, net of capitalized interest, and income taxes are presented below: Three Months Ended March 31, 2019 2018 Net cash paid (received) during the period for: Interest, net of capitalized interest $ 33.7 $ 32.8 Income taxes 2.1 (7.5 )
Schedule of non-cash investing and financing activities	Non-cash investing and financing activities are presented below: Three Months Ended March 31, 2019 2018 Capital investments $ 17.8 $ 20.0 Issuance of restricted stock and restricted stock units 2.3 3.7

Supplementary Guarantor Infor_2

Supplementary Guarantor Information (Tables)	3 Months Ended
	Mar. 31, 2019
Supplemental Guarantor Information [Abstract]
Schedule of Condensed Comprehensive Income (Loss)	Condensed Consolidated Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net sales $ — $ 1,549.4 $ 83.5 $ 185.4 $ (120.6 ) $ 1,697.7 Cost of products sold (exclusive of items shown separately below) — 1,362.0 59.3 151.9 (107.8 ) 1,465.4 Selling and administrative expenses 1.4 73.8 3.9 9.7 (12.2 ) 76.6 Depreciation — 35.7 2.1 12.6 — 50.4 Ashland Works closure — 64.1 — — — 64.1 Total operating costs 1.4 1,535.6 65.3 174.2 (120.0 ) 1,656.5 Operating profit (loss) (1.4 ) 13.8 18.2 11.2 (0.6 ) 41.2 Interest expense — 36.3 — 1.6 — 37.9 Pension and OPEB (income) expense — 6.5 6.5 Other (income) expense — (6.6 ) (5.0 ) (1.1 ) — (12.7 ) Income (loss) before income taxes (1.4 ) (22.4 ) 23.2 10.7 (0.6 ) 9.5 Income tax expense (benefit) — (4.6 ) 5.8 0.4 (0.2 ) 1.4 Equity in net income (loss) of subsidiaries (3.1 ) 14.7 — 0.1 (11.7 ) — Net income (loss) (4.5 ) (3.1 ) 17.4 10.4 (12.1 ) 8.1 Less: Net income attributable to noncontrolling interests — — — 12.6 — 12.6 Net income (loss) attributable to AK Steel Holding Corporation (4.5 ) (3.1 ) 17.4 (2.2 ) (12.1 ) (4.5 ) Other comprehensive income (loss) (4.9 ) (4.9 ) — (0.7 ) 5.6 (4.9 ) Comprehensive income (loss) attributable to AK Steel Holding Corporation $ (9.4 ) $ (8.0 ) $ 17.4 $ (2.9 ) $ (6.5 ) $ (9.4 ) Condensed Consolidated Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net sales $ — $ 1,503.0 $ 77.1 $ 208.7 $ (129.9 ) $ 1,658.9 Cost of products sold (exclusive of item shown separately below) — 1,353.4 54.6 171.7 (116.0 ) 1,463.7 Selling and administrative expenses 1.3 74.9 3.6 8.7 (11.8 ) 76.7 Depreciation — 43.4 2.0 9.5 — 54.9 Total operating costs 1.3 1,471.7 60.2 189.9 (127.8 ) 1,595.3 Operating profit (loss) (1.3 ) 31.3 16.9 18.8 (2.1 ) 63.6 Interest expense — 36.4 — 1.2 — 37.6 Pension and OPEB (income) expense — (10.0 ) — — — (10.0 ) Other (income) expense — 1.2 (3.5 ) (1.6 ) — (3.9 ) Income (loss) before income taxes (1.3 ) 3.7 20.4 19.2 (2.1 ) 39.9 Income tax expense (benefit) — (11.9 ) 5.1 2.4 (0.5 ) (4.9 ) Equity in net income (loss) of subsidiaries 30.0 14.4 — — (44.4 ) — Net income (loss) 28.7 30.0 15.3 16.8 (46.0 ) 44.8 Less: Net income attributable to noncontrolling interests — — — 16.1 — 16.1 Net income (loss) attributable to AK Steel Holding Corporation 28.7 30.0 15.3 0.7 (46.0 ) 28.7 Other comprehensive income (loss) (6.7 ) (6.7 ) — 1.1 5.6 (6.7 ) Comprehensive income (loss) attributable to AK Steel Holding Corporation $ 22.0 $ 23.3 $ 15.3 $ 1.8 $ (40.4 ) $ 22.0
Schedule of Condensed Balance Sheet	Condensed Consolidated Balance Sheets March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company ASSETS Current assets: Cash and cash equivalents $ — $ 20.5 $ 4.6 $ 16.1 $ — $ 41.2 Accounts receivable, net — 591.5 39.5 111.9 (22.3 ) 720.6 Inventory — 1,255.1 55.7 77.8 (9.8 ) 1,378.8 Other current assets — 74.6 0.1 14.1 — 88.8 Total current assets — 1,941.7 99.9 219.9 (32.1 ) 2,229.4 Property, plant and equipment — 6,129.3 191.3 675.8 — 6,996.4 Accumulated depreciation — (4,821.7 ) (104.9 ) (180.1 ) — (5,106.7 ) Property, plant and equipment, net — 1,307.6 86.4 495.7 — 1,889.7 Investment in subsidiaries (3,105.0 ) 1,966.6 — 68.3 1,070.1 — Inter-company accounts 3,199.0 — 1,669.5 — (4,868.5 ) — Operating lease assets — 222.2 2.9 28.9 — 254.0 Other non-current assets — 57.1 32.9 307.0 — 397.0 TOTAL ASSETS $ 94.0 $ 5,495.2 $ 1,891.6 $ 1,119.8 $ (3,830.5 ) $ 4,770.1 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 690.7 $ 29.3 $ 62.5 $ (14.3 ) $ 768.2 Accrued liabilities — 194.6 6.9 23.7 — 225.2 Current portion of operating lease liabilities — 52.9 0.9 2.3 — 56.1 Current portion of pension and other postretirement benefit obligations — 37.9 — 0.3 — 38.2 Total current liabilities — 976.1 37.1 88.8 (14.3 ) 1,087.7 Non-current liabilities: Long-term debt — 2,037.7 — — — 2,037.7 Long-term operating lease liabilities — 190.8 1.9 27.6 — 220.3 Pension and other postretirement benefit obligations — 821.5 — 2.7 — 824.2 Inter-company accounts — 4,431.9 — 515.2 (4,947.1 ) — Other non-current liabilities — 142.2 0.2 28.0 — 170.4 TOTAL LIABILITIES — 8,600.2 39.2 662.3 (4,961.4 ) 4,340.3 Equity: Total stockholders’ equity (deficit) 94.0 (3,105.0 ) 1,852.4 121.7 1,130.9 94.0 Noncontrolling interests — — — 335.8 — 335.8 TOTAL EQUITY 94.0 (3,105.0 ) 1,852.4 457.5 1,130.9 429.8 TOTAL LIABILITIES AND EQUITY $ 94.0 $ 5,495.2 $ 1,891.6 $ 1,119.8 $ (3,830.5 ) $ 4,770.1 Condensed Consolidated Balance Sheets December 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company ASSETS Current assets: Cash and cash equivalents $ — $ 22.1 $ 8.2 $ 18.3 $ — $ 48.6 Accounts receivable, net — 515.4 34.0 95.3 (8.9 ) 635.8 Inventory — 1,299.6 53.9 75.6 (9.2 ) 1,419.9 Other current assets — 85.5 0.1 11.4 — 97.0 Total current assets — 1,922.6 96.2 200.6 (18.1 ) 2,201.3 Property, plant and equipment — 6,111.1 189.7 668.4 — 6,969.2 Accumulated depreciation — (4,785.5 ) (102.8 ) (169.3 ) — (5,057.6 ) Property, plant and equipment, net — 1,325.6 86.9 499.1 — 1,911.6 Investment in subsidiaries (3,017.4 ) 1,931.1 — 68.2 1,018.1 — Inter-company accounts 3,117.3 — 1,630.7 — (4,748.0 ) — Other non-current assets — 54.3 32.9 315.6 — 402.8 TOTAL ASSETS $ 99.9 $ 5,233.6 $ 1,846.7 $ 1,083.5 $ (3,748.0 ) $ 4,515.7 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 722.5 $ 26.2 $ 55.5 $ (3.2 ) $ 801.0 Accrued liabilities — 251.5 8.7 28.7 — 288.9 Current portion of pension and other postretirement benefit obligations — 38.4 — 0.3 — 38.7 Total current liabilities — 1,012.4 34.9 84.5 (3.2 ) 1,128.6 Non-current liabilities: Long-term debt — 1,993.7 — — — 1,993.7 Pension and other postretirement benefit obligations — 827.0 — 2.9 — 829.9 Inter-company accounts — 4,312.3 — 511.2 (4,823.5 ) — Other non-current liabilities — 105.6 0.2 28.2 — 134.0 TOTAL LIABILITIES — 8,251.0 35.1 626.8 (4,826.7 ) 4,086.2 Equity: Total stockholders’ equity (deficit) 99.9 (3,017.4 ) 1,811.6 127.1 1,078.7 99.9 Noncontrolling interests — — — 329.6 — 329.6 TOTAL EQUITY 99.9 (3,017.4 ) 1,811.6 456.7 1,078.7 429.5 TOTAL LIABILITIES AND EQUITY $ 99.9 $ 5,233.6 $ 1,846.7 $ 1,083.5 $ (3,748.0 ) $ 4,515.7
Schedule of Condensed Cash Flow Statement	Condensed Consolidated Statements of Cash Flows Three Months Ended March 31, 2019 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net cash flows from operating activities $ (1.1 ) $ (35.7 ) $ 13.0 $ 13.4 $ 2.5 $ (7.9 ) Cash flows from investing activities: Capital investments — (32.9 ) (1.2 ) (10.7 ) — (44.8 ) Other investing items, net — 11.6 — — — 11.6 Net cash flows from investing activities — (21.3 ) (1.2 ) (10.7 ) — (33.2 ) Cash flows from financing activities: Net borrowings (payments) under credit facility — 45.0 — — — 45.0 Redemption of long-term debt — (4.0 ) — — — (4.0 ) Inter-company activity 1.1 15.3 (15.4 ) 1.5 (2.5 ) — SunCoke Middletown distributions to noncontrolling interest owners — — — (6.4 ) — (6.4 ) Other financing items, net — (0.9 ) — — — (0.9 ) Net cash flows from financing activities 1.1 55.4 (15.4 ) (4.9 ) (2.5 ) 33.7 Net increase (decrease) in cash and cash equivalents — (1.6 ) (3.6 ) (2.2 ) — (7.4 ) Cash and equivalents, beginning of period — 22.1 8.2 18.3 — 48.6 Cash and equivalents, end of period $ — $ 20.5 $ 4.6 $ 16.1 $ — $ 41.2 Condensed Consolidated Statements of Cash Flows Three Months Ended March 31, 2018 AK Holding AK Steel Guarantor Subsidiaries of the Senior Notes Other Non-Guarantor Subsidiaries Eliminations Consolidated Company Net cash flows from operating activities $ (1.0 ) $ 45.7 $ 4.8 $ 11.1 $ 5.0 $ 65.6 Cash flows from investing activities: Capital investments — (31.4 ) (0.9 ) (5.6 ) — (37.9 ) Other investing items, net — — — — — — Net cash flows from investing activities — (31.4 ) (0.9 ) (5.6 ) — (37.9 ) Cash flows from financing activities: Net borrowings (payments) under credit facility — (10.0 ) — — — (10.0 ) Redemption of long-term debt — — — — — — Inter-company activity 2.0 (6.2 ) (7.0 ) 16.2 (5.0 ) — SunCoke Middletown distributions to noncontrolling interest owners — — — (10.3 ) — (10.3 ) Other financing items, net (1.0 ) 0.1 — — — (0.9 ) Net cash flows from financing activities 1.0 (16.1 ) (7.0 ) 5.9 (5.0 ) (21.2 ) Net increase (decrease) in cash and cash equivalents — (1.8 ) (3.1 ) 11.4 — 6.5 Cash and equivalents, beginning of period — 14.5 7.2 16.3 — 38.0 Cash and equivalents, end of period $ — $ 12.7 $ 4.1 $ 27.7 $ — $ 44.5

Supplementary Financial State_3

Supplementary Financial Statement Information Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 1,697.7	$ 1,658.9
Non-US [Member]
Disaggregation of Revenue [Line Items]
Net sales	143.2	167.8
Carbon steel
Disaggregation of Revenue [Line Items]
Net sales	1,099.2	1,068.6
Stainless and electrical steel
Disaggregation of Revenue [Line Items]
Net sales	444.5	426.1
Tubular products, components and other
Disaggregation of Revenue [Line Items]
Net sales	154	164.2
Automotive
Disaggregation of Revenue [Line Items]
Net sales	1,090.9	1,119.1
Infrastructure and Manufacturing
Disaggregation of Revenue [Line Items]
Net sales	278.1	241.3
Distributors and Converters
Disaggregation of Revenue [Line Items]
Net sales	$ 328.7	$ 298.5

Supplementary Financial State_4

Supplementary Financial Statement Information Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished and semi-finished	$ 1,021.9	$ 1,054.4
Raw materials	356.9	365.5
Inventory	$ 1,378.8	$ 1,419.9

Supplementary Financial State_5

Supplementary Financial Statement Information Intangibles (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Amount	$ 55.9		$ 55.9
Intangible Assets, Accumulated Amortization	(14)		(12)
Intangible Assets, Net Amount	41.9		43.9
Amortization of Intangible Assets	2	$ 2.4
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Amount	36.6		36.6
Intangible Assets, Accumulated Amortization	(8.7)		(7.4)
Intangible Assets, Net Amount	27.9		29.2
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Amount	19.3		19.3
Intangible Assets, Accumulated Amortization	(5.3)		(4.6)
Intangible Assets, Net Amount	$ 14		$ 14.7

Supplementary Financial State_6

Supplementary Financial Statement Information Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Revenue	$ 77.8	$ 74.8
Gross profit	21.5	21.1
Net income	2.7	4.2
Cost of Sales [Member]
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 0.7	$ 1.3

Supplementary Financial State_7

Supplementary Financial Statement Information Facility Closure (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	$ 77.4
Ashland Works Hot End [Member]
Restructuring Cost and Reserve [Line Items]
Costs For Temporarily Idled Operations	2.5	$ 5.4
Take-Or-Pay Supply Agreements [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	18.5
Supplemental Unemployment Benefits [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	15.2
Withdrawal from Multiemployer Defined Benefit Plan [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	23
Equipment Idling And Other Costs [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	7.4
Scenario, Forecast [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Cash Payments Related To Facility Closure			$ 30	$ 15
Cash Charge For Facility Closure				14
Scenario, Forecast [Member] | Facility Closing [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Cash Charge For Facility Closure				10
Scenario, Forecast [Member] | Accelerated Depreciation Due To Facility Closure [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Cash Charge For Facility Closure				$ 4
Pension and OPEB Expense (Income) [Member] | Other Pension, Postretirement and Supplemental Plans [Member] | Ashland Works [Member]
Restructuring Cost and Reserve [Line Items]
Ashland Works closure	$ 13.3

Income Tax (Details)

Income Tax (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Income Tax Disclosure [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (5.3)

Long-term Debt and Other Fina_3

Long-term Debt and Other Financing Debt Notes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized debt discount and issuance costs	$ (38.1)	$ (41.7)
Total long-term debt	2,037.7	1,993.7
Senior Secured Notes Due July 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 380	$ 380
Debt Instrument, Interest Rate, Stated Percentage	7.50%	7.50%
Debt Instrument, Interest Rate, Effective Percentage	8.30%	8.30%
Exchangeable Senior Notes Due November 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 148.5	$ 148.5
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%
Debt Instrument, Interest Rate, Effective Percentage	10.80%	10.80%
Senior Notes Due October 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 406.2	$ 406.2
Debt Instrument, Interest Rate, Stated Percentage	7.625%	7.625%
Senior Notes Due October 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 270.2	$ 274.8
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Debt Instrument, Interest Rate, Effective Percentage	7.10%	7.10%
Debt Instrument, Repurchase Amount	$ 4.6
Senior Notes Due March 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 391.6	$ 391.6
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 99.3	$ 99.3
Other Nonoperating Income (Expense) [Member] | Senior Notes Due October 2025 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument	$ 0.6

Long-term Debt and Other Fina_4

Long-term Debt and Other Financing Credit Facility (Details) - Revolving Credit Facility [Member] - USD ($)	Apr. 26, 2019	Mar. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,350,000,000
Outstanding borrowings on revolving credit facility		380,000,000	$ 335,000,000
Line of Credit Facility, Current Borrowing Capacity		1,350,000,000
Line of credit facility, remaining borrowing capacity		896,800,000
Letters of credit, outstanding		$ 73,200,000
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000

Leases - Lease cost (Details)

Leases - Lease cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating leases	$ 16.7
Short-term leases	11.1
Variable lease costs	17.3
Total	$ 45.1

Leases - Other Information (Det

Leases - Other Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Cash paid for operating cash flows from operating leases	$ 18.1
Right-of-use assets obtained in exchange for operating lease liabilities	$ 3.7
Weighted-average remaining lease term of operating leases (in years)	7 years 9 months 18 days
Weighted-average discount rate for operating leases	8.40%

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease Liability, Maturity [Line Items]
Lessee, Operating and Finance Lease, Earliest Option To Terminate	1 year
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (remaining period of year)	$ 53.3
2020	63.4
2021	50.8
2022	40.9
2023	34.8
Thereafter	148.2
Total future minimum operating lease payments	391.4
Less imputed interest	115
Total operating lease liabilities	276.4
Less current portion of operating lease liabilities	56.1	$ 0
Long-term operating lease liabilities	$ 220.3	$ 0
Minimum [Member]
Lessee, Lease Liability, Maturity [Line Items]
Lessee, Operating Lease, Renewal Term	1 year
Lessee, Operating and Finance Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Lease Liability, Maturity [Line Items]
Lessee, Operating Lease, Renewal Term	19 years
Lessee, Operating and Finance Lease, Renewal Term	32 years

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Payment for Pension Benefits		$ 9.2	$ 6
Net periodic benefit cost (income) [Abstract]
Net periodic benefit (income) expense		7.9	(8.1)
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated pension plan contributions in current year		45.9
Payment for Pension Benefits		9.2
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		50
Defined Benefit Plans, Estimated Future Employer Contributions, Year Two		50
Net periodic benefit cost (income) [Abstract]
Service cost		0.5	0.8
Interest cost		22.3	23.7
Expected return on assets		(28)	(38.8)
Amortization of prior service cost (credit)		0.7	1
Amortization of (gain) loss		(1.7)	3.9
Termination benefits—Ashland Works		9.7	0
Net periodic benefit (income) expense		3.5	(9.4)
Other Postretirement Benefits [Member]
Net periodic benefit cost (income) [Abstract]
Service cost		0.9	1.1
Interest cost		4.1	3.9
Amortization of prior service cost (credit)		(3.3)	(3.4)
Amortization of (gain) loss		(0.9)	(0.3)
Termination benefits—Ashland Works		3.6	0
Net periodic benefit (income) expense		$ 4.4	$ 1.3
Subsequent Event [Member] | Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Payment for Pension Benefits	$ 10.3

Environmental and Legal Conti_3

Environmental and Legal Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities	$ 7.3	$ 8
Other non-current liabilities	$ 32.6	$ 31.2

Environmental and Legal Conti_4

Environmental and Legal Contingencies (Details 2) $ in Millions	Mar. 31, 2019USD ($)
Hamilton Plant [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	$ 0.7
Mansfield OH Works [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	0.6
Ashland coke plant [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	1.4
Ambridge Works [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	5.6
Middletown Works RCRA Site [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	12.3
Zanesville Works RCRA [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	$ 0.1

Environmental and Legal Conti_5

Environmental and Legal Contingencies (Details 3)		3 Months Ended
		Mar. 31, 2019USD ($)plaintiffsdefendantsclaims-lawsuits	Mar. 31, 2018USD ($)claims-lawsuits
Asbestos Claims With Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending	[1]	171
Claims with specific dollar claims for damages [Abstract]
Asbestos Lawsuits Pending With Dollars Number Of Plaintiffs | plaintiffs		2,246
Asbestos Lawsuits Pending With Dollars Number Of Defendants | defendants		19,559
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 1 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		164
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 0
Amount claimed per plaintiff, upper range | $		$ 200,000
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 2 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		4
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 200,000
Amount claimed per plaintiff, upper range | $		$ 5,000,000
Asbestos Claims With Specific Dollar Claim For Damages [Member] | Asbestos Claims of Range 3 [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		3
Claims with specific dollar claims for damages [Abstract]
Amount claimed per plaintiff, lower range | $		$ 5,000,000
Amount claimed per plaintiff, upper range | $		$ 20,000,000
Asbestos Claims Without Specific Dollar Claim For Damages [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		176
Asbestos Issue [Member]
Information on pending asbestos cases [Line Items]
Number of asbestos cases pending		347
Claims with specific dollar claims for damages [Abstract]
New Claims Filed		11	12
Pending Claims Disposed Of		7	11
Total Amount Paid in Settlements | $		$ 200,000	$ 300,000
[1]	Involve a total of 2,246 plaintiffs and 19,559

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated share-based compensation expense	$ 9.5
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	4.3	$ 4.5
Stock Options [Member]
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	$ 1.7	1.7
Number of options granted (in shares)	1,199,415
Weighted-average grant-date fair value per share of options granted (dollars per share)	$ 1.52
Number of options exercised (in shares)	0
Restricted Stock [Member]
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	$ 1.5	1.9
Number of shares granted (in shares)	768,304
Weighted average grant date fair value, granted (dollars per share)	$ 2.66
Intrinsic value of shares vested/restrictions lapsed during the period	$ 1.9
Restricted Stock Units Issued to Directors [Member]
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	0.3	0.3
Performance shares [Member]
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	$ 0.6	0.5
Number of shares granted (in shares)	595,733
Weighted average grant date fair value, granted (dollars per share)	$ 3.09
Intrinsic value of shares vested/restrictions lapsed during the period	$ 0.7
Long-term Performance Plan [Member]
Share-based Compensation Expense [Abstract]
Share-based Compensation Expense	$ 0.2	$ 0.1
Share-based Compensation, Executive Officer Target Allocation of Equity Under Comprehensive Award	50.00%	30.00%
Share-based Compensation, Target Allocation of Equity Under Comprehensive Award (in hundredths)	30.00%

Comprehensive Income (Loss) (De

Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Foreign currency translation
Balance at beginning of period		$ (0.6)	$ 1.1
Other comprehensive income (loss)—foreign currency translation gain (loss)		(0.7)	1.1
Balance at end of period		(1.3)	2.2
Cash flow hedges
Balance at beginning of period		7.2	22.3
Other comprehensive income (loss):
Gains (losses) arising in period		7.4	(1.4)
Income tax expense (benefit) (b)	[1]	0	0
Gains (losses) arising in period, net of tax		7.4	(1.4)
Reclassification of losses (gains) to net income:
Recorded in cost of products sold		(6.4)	(7.6)
Income tax (expense) benefit (b)	[1]	0	0
Net amount of reclassification of losses (gains) to net income, net of tax		(6.4)	(7.6)
Total other comprehensive income (loss), net of tax		1	(9)
Balance at end of period		8.2	14.1
Pension and OPEB plans
Balance at beginning of period		(106.6)	(73.6)
Reclassification to net income:
Prior service costs (credits) (a)		(2.6)	(2.4)
Actuarial (gains) losses (a)		(2.6)	3.6
Subtotal		(5.2)	1.2
Income tax (expense) benefit (b)	[1]	0	0
Amount of reclassification to net income, net of tax		(5.2)	1.2
Total other comprehensive income (loss), net of tax		(5.2)	1.2
Balance at end of period		(111.8)	(72.4)
Cost of Sales [Member]
Reclassification of losses (gains) to net income:
Recorded in cost of products sold		(6.4)	(7.6)
Pension and OPEB Expense (Income) [Member]
Reclassification to net income:
Prior service costs (credits) (a)	[2]	(2.6)	(2.4)
Actuarial (gains) losses (a)	[2]	$ (2.6)	$ 3.6
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Accumulated Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 0	$ 0.8
[1]	Included in income tax expense (benefit)
[2]	Included in pension and OPEB (income) expense

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to AK Steel Holding Corporation	$ (4.5)	$ 28.7
Less: distributed earnings to common stockholders and holders of certain stock compensation awards	0	0
Undistributed earnings	(4.5)	28.7
Common stockholders earnings—basic and diluted
Distributed earnings - basic and diluted	0	0
Undistributed earnings to common stockholders - basic and diluted	(4.5)	28.6
Common stockholders earnings—basic and diluted	(4.5)	28.6
Common stockholders earnings – diluted:
Distributed earnings to common stockholders - diluted	0	0
Undistributed earnings to common stockholders - diluted	(4.5)	28.6
Common stockholders earnings (loss) – diluted	$ (4.5)	$ 28.6
Common shares outstanding (weighted-average shares in millions):
Common shares outstanding for basic earnings per share	315.6	314.7
Effect of exchangeable debt (in shares)	0	0.5
Effect of dilutive stock-based compensation (in shares)	0	0.8
Common shares outstanding for diluted earnings per share	315.6	316
Basic earnings per share:
Distributed earnings - basic (in dollars per share)	$ 0	$ 0
Undistributed earnings - basic (in dollars per share)	(0.01)	0.09
Basic earnings per share (in dollars per share)	(0.01)	0.09
Diluted earnings per share:
Distributed earnings - diluted (in dollars per share)	0	0
Undistributed earnings - diluted (in dollars per share)	(0.01)	0.09
Diluted earnings per share (in dollars per share)	$ (0.01)	$ 0.09
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect (in shares)	3.5	2.2

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Variable Interest Entity [Line Items]
Income before income taxes	$ 9.5	$ 39.9
SunCoke Middletown [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage (in hundredths)	0.00%
Income before income taxes	$ 12.7	$ 16.2
Vicksmetal Armco Associates [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage (in hundredths)	50.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) $ in Millions	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Estimate of Fair Value, Fair Value Disclosure [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	$ (1,985.4)	$ (1,852.4)
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	(1,985.4)	(1,852.4)
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	(2,037.7)	(1,993.7)
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Debt Instrument, Fair Value Disclosure	(2,037.7)	(1,993.7)
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value
Assets measured at fair value	74.1	65
Liabilities measured at fair value
Liabilities measured at fair value	(5.1)	(10.2)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Assets measured at fair value	41.2	48.6
Liabilities measured at fair value
Liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Assets measured at fair value	32.9	16.4
Liabilities measured at fair value
Liabilities measured at fair value	(5.1)	(10.2)
Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member]
Assets measured at fair value
Cash and cash equivalents	41.2	48.6
Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Cash and cash equivalents	41.2	48.6
Fair Value, Measurements, Recurring [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Cash and cash equivalents	$ 0	0
Measurement Input, Counterparty Credit Risk [Member] | Maximum [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Benchmark interest rates for asset contracts (in hundredths)	0.01
Benchmark interest rates for liability contracts (in hundredths)	0.03
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member]
Assets measured at fair value
Commodity hedge contracts - current	$ 0.2	0.1
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Commodity hedge contracts - current	0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Commodity hedge contracts - current	0.2	0.1
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	0.3	0.4
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	0.3	0.4
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	(0.9)	(1.2)
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	(0.9)	(1.2)
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	(0.9)	(1.5)
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	(0.9)	(1.5)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member]
Assets measured at fair value
Commodity hedge contracts - current	26.1	13
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Commodity hedge contracts - current	0	0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Commodity hedge contracts - current	26.1	13
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	6.3	2.9
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	0	0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Commodity hedge contracts - noncurrent	6.3	2.9
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	(2.6)	(5.9)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	0	0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts - current	(2.6)	(5.9)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	(0.7)	(1.6)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	0	0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other Non-current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts - noncurrent	$ (0.7)	$ (1.6)

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) € in Millions, $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)MMBTUtlbMW	Mar. 31, 2019CAD ($)MMBTUtlbMW	Mar. 31, 2019EUR (€)MMBTUtlbMW	Dec. 31, 2018CAD ($)MMBTUtlbMW	Dec. 31, 2018EUR (€)MMBTUtlbMW
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 0
Commodity Contract [Member] | Natural Gas [Member]
Derivative [Line Items]
Nonmonetary Notional Amount of Derivatives | MMBTU	43,525,000	43,525,000	43,525,000	39,868,000	39,868,000
Beginning Settlement Date	Apr. 1, 2019
Ending Settlement Date	Mar. 31, 2021
Gains (losses) expected to be reclassified into cost of products sold within the next twelve months	$ (1.5)
Commodity Contract [Member] | Zinc [Member]
Derivative [Line Items]
Nonmonetary Notional Amount of Derivatives | lb	54,450,000	54,450,000	54,450,000	52,150,000	52,150,000
Beginning Settlement Date	Apr. 1, 2019
Ending Settlement Date	Dec. 31, 2020
Gains (losses) expected to be reclassified into cost of products sold within the next twelve months	$ 4
Commodity Contract [Member] | Iron Ore [Member]
Derivative [Line Items]
Nonmonetary Notional Amount of Derivatives | t	1,955,000	1,955,000	1,955,000	2,125,000	2,125,000
Commodity Contract [Member] | Electricity [Member]
Derivative [Line Items]
Nonmonetary Notional Amount of Derivatives | MW	1,440,000	1,440,000	1,440,000	1,461,000	1,461,000
Beginning Settlement Date	Apr. 1, 2019
Ending Settlement Date	Dec. 31, 2020
Gains (losses) expected to be reclassified into cost of products sold within the next twelve months	$ (0.5)
Foreign Exchange Contract [Member] | Euro Member Countries, Euro
Derivative [Line Items]
Derivative, Notional Amount | €			€ 7		€ 4
Foreign Exchange Contract [Member] | Canada, Dollars
Derivative [Line Items]
Derivative, Notional Amount		$ 128.1		$ 118.6
Beginning Settlement Date	Apr. 1, 2019
Ending Settlement Date	Dec. 31, 2021
Gains (losses) expected to be reclassified into cost of products sold within the next twelve months	$ (1.7)

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	$ 7.9	$ 3.4
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent	0.8	1
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	(2.3)	(4.7)
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent	(0.7)	(1.2)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	0.1	0
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent	0.3	0.4
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	(0.9)	(1.2)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent	(0.9)	(1.5)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	18.2	9.6
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Non-current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent	5.5	1.9
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	(0.3)	(1.2)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Non-current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent	0	(0.4)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	$ 0.1	$ 0.1

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (Details 3) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) arising in period	$ 7.4	$ (1.4)
Recorded in cost of products sold	6.4	7.6
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) arising in period	6.8	0.3
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) arising in period	0.6	(1.7)
Other Nonoperating Income (Expense) [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as cash flow hedges:	(0.1)	(0.3)
Cost of Products Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recorded in cost of products sold	6.4	7.6
Cost of Products Sold [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recorded in cost of products sold	6.7	7.6
Derivatives not designated as cash flow hedges:	20.5	(8.7)
Cost of Products Sold [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recorded in cost of products sold	(0.3)	0
Iron Ore [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cash Received on Hedge	4.7	2.3
Iron Ore [Member] | Cost of Products Sold [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as cash flow hedges:	$ 21.8	$ (7.7)

Supplementary Cash Flow Infor_3

Supplementary Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Supplemental cash flow, net cash paid (received) during the period for: [Abstract]
Interest, net of capitalized interest	$ 33.7	$ 32.8
Income taxes	2.1	(7.5)
Net Cash Provided by (Used in) Operating Activities	(7.9)	65.6
Cash and cash equivalents	41.2		$ 48.6
Supplemental cash flow, noncash investing and financing activities [Abstract]
Capital investments	17.8	20
Restricted Stock and Restricted Stock Units [Member]
Supplemental cash flow, noncash investing and financing activities [Abstract]
Issuance of restricted stock and restricted stock units	2.3	3.7
SunCoke Middletown [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Supplemental cash flow, net cash paid (received) during the period for: [Abstract]
Net Cash Provided by (Used in) Operating Activities	7	$ 21.5
Cash and cash equivalents	$ 0.3		$ 1.1

Labor Agreements (Details)

Labor Agreements (Details)	Mar. 31, 2019employees
Ashland Works [Member]
Concentration Risk [Line Items]
Entity Number of Employees	230
Mountain State Carbon [Member]
Concentration Risk [Line Items]
Entity Number of Employees	240
Butler Works [Member]
Concentration Risk [Line Items]
Entity Number of Employees	1,150
Zanesville Works [Member]
Concentration Risk [Line Items]
Entity Number of Employees	110
Coshocton Works [Member]
Concentration Risk [Line Items]
Entity Number of Employees	310

New Accounting Pronouncements_2

New Accounting Pronouncements (Details) - USD ($)	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases, Other Information [Line Items]
Additional Operating Lease Right-of-Use Assets	$ 254,000,000		$ 0
Additional Operating Lease Liabilities	$ 276,400,000
Accounting Standards Update 2016-02 [Member]
Leases, Other Information [Line Items]
Additional Operating Lease Right-of-Use Assets		$ 291,100,000
Additional Operating Lease Liabilities		$ 291,100,000

Supplementary Guarantor Infor_3

Supplementary Guarantor Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	$ 1,697.7	$ 1,658.9
Cost of products sold (exclusive of items shown separately below)	1,465.4	1,463.7
Selling and administrative expenses	76.6	76.7
Depreciation	50.4	54.9
Ashland Works closure	64.1	0
Total operating costs	1,656.5	1,595.3
Operating profit (loss)	41.2	63.6
Interest expense	37.9	37.6
Pension and OPEB (income) expense	6.5	(10)
Other (income) expense	(12.7)	(3.9)
Income (loss) before income taxes	9.5	39.9
Income tax expense (benefit)	1.4	(4.9)
Equity in net income (loss) of subsidiaries	0	0
Net income	8.1	44.8
Less: Net income attributable to noncontrolling interests	12.6	16.1
Net income attributable to AK Steel Holding Corporation	(4.5)	28.7
Other comprehensive income (loss)	(4.9)	(6.7)
Comprehensive income (loss) attributable to AK Steel Holding Corporation	(9.4)	22
Current assets:
Cash and cash equivalents			$ 41.2	$ 48.6
Accounts receivable, net			720.6	635.8
Inventory			1,378.8	1,419.9
Other current assets			88.8	97
Total current assets			2,229.4	2,201.3
Property, plant and equipment			6,996.4	6,969.2
Accumulated depreciation			(5,106.7)	(5,057.6)
Property, plant and equipment, net			1,889.7	1,911.6
Investment in subsidiaries			0	0
Inter-company accounts			0	0
Operating lease assets			254	0
Other non-current assets			397	402.8
TOTAL ASSETS			4,770.1	4,515.7
Current liabilities:
Accounts payable			768.2	801
Accrued liabilities			225.2	288.9
Current portion of operating lease liabilities			56.1	0
Current portion of pension and other postretirement benefit obligations			38.2	38.7
Total current liabilities			1,087.7	1,128.6
Non-current liabilities:
Long-term debt			2,037.7	1,993.7
Long-term operating lease liabilities			220.3	0
Pension and other postretirement benefit obligations			824.2	829.9
Inter-company accounts			0	0
Other non-current liabilities			170.4	134
TOTAL LIABILITIES			4,340.3	4,086.2
Equity [Abstract]
Total stockholders’ equity (deficit)			94	99.9
Noncontrolling interests			335.8	329.6
TOTAL EQUITY			429.8	429.5	$ 331.9
TOTAL LIABILITIES AND EQUITY			4,770.1	4,515.7
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	(7.9)	65.6
Cash flows from investing activities:
Capital investments	(44.8)	(37.9)
Other investing items, net	11.6	0
Net cash flows from investing activities	(33.2)	(37.9)
Cash flows from financing activities:
Net borrowings (payments) under credit facility	45	(10)
Redemption of long-term debt	(4)	0
Inter-company activity	0	0
SunCoke Middletown distributions to noncontrolling interest owners	(6.4)	(10.3)
Other financing items, net	(0.9)	(0.9)
Net cash flows from financing activities	33.7	(21.2)
Net increase (decrease) in cash and cash equivalents	(7.4)	6.5
Cash and cash equivalents, beginning of period	48.6	38
Cash and equivalents, end of period	48.6	38	41.2	48.6	44.5
AK Holding [Member]
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	0	0
Cost of products sold (exclusive of items shown separately below)	0	0
Selling and administrative expenses	1.4	1.3
Depreciation	0	0
Ashland Works closure	0
Total operating costs	1.4	1.3
Operating profit (loss)	(1.4)	(1.3)
Interest expense	0	0
Pension and OPEB (income) expense	0	0
Other (income) expense	0	0
Income (loss) before income taxes	(1.4)	(1.3)
Income tax expense (benefit)	0	0
Equity in net income (loss) of subsidiaries	(3.1)	30
Net income	(4.5)	28.7
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to AK Steel Holding Corporation	(4.5)	28.7
Other comprehensive income (loss)	(4.9)	(6.7)
Comprehensive income (loss) attributable to AK Steel Holding Corporation	(9.4)	22
Current assets:
Cash and cash equivalents			0	0
Accounts receivable, net			0	0
Inventory			0	0
Other current assets			0	0
Total current assets			0	0
Property, plant and equipment			0	0
Accumulated depreciation			0	0
Property, plant and equipment, net			0	0
Investment in subsidiaries			(3,105)	(3,017.4)
Inter-company accounts			3,199	3,117.3
Operating lease assets			0
Other non-current assets			0	0
TOTAL ASSETS			94	99.9
Current liabilities:
Accounts payable			0	0
Accrued liabilities			0	0
Current portion of operating lease liabilities			0
Current portion of pension and other postretirement benefit obligations			0	0
Total current liabilities			0	0
Non-current liabilities:
Long-term debt			0	0
Long-term operating lease liabilities			0
Pension and other postretirement benefit obligations			0	0
Inter-company accounts			0	0
Other non-current liabilities			0	0
TOTAL LIABILITIES			0	0
Equity [Abstract]
Total stockholders’ equity (deficit)			94	99.9
Noncontrolling interests			0	0
TOTAL EQUITY			94	99.9
TOTAL LIABILITIES AND EQUITY			94	99.9
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	(1.1)	(1)
Cash flows from investing activities:
Capital investments	0	0
Other investing items, net	0	0
Net cash flows from investing activities	0	0
Cash flows from financing activities:
Net borrowings (payments) under credit facility	0	0
Redemption of long-term debt	0	0
Inter-company activity	1.1	2
SunCoke Middletown distributions to noncontrolling interest owners	0	0
Other financing items, net	0	(1)
Net cash flows from financing activities	1.1	1
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and equivalents, end of period	0	0	0	0	0
AK Steel [Member]
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	1,549.4	1,503
Cost of products sold (exclusive of items shown separately below)	1,362	1,353.4
Selling and administrative expenses	73.8	74.9
Depreciation	35.7	43.4
Ashland Works closure	64.1
Total operating costs	1,535.6	1,471.7
Operating profit (loss)	13.8	31.3
Interest expense	36.3	36.4
Pension and OPEB (income) expense	6.5	(10)
Other (income) expense	(6.6)	1.2
Income (loss) before income taxes	(22.4)	3.7
Income tax expense (benefit)	(4.6)	(11.9)
Equity in net income (loss) of subsidiaries	14.7	14.4
Net income	(3.1)	30
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to AK Steel Holding Corporation	(3.1)	30
Other comprehensive income (loss)	(4.9)	(6.7)
Comprehensive income (loss) attributable to AK Steel Holding Corporation	(8)	23.3
Current assets:
Cash and cash equivalents			20.5	22.1
Accounts receivable, net			591.5	515.4
Inventory			1,255.1	1,299.6
Other current assets			74.6	85.5
Total current assets			1,941.7	1,922.6
Property, plant and equipment			6,129.3	6,111.1
Accumulated depreciation			(4,821.7)	(4,785.5)
Property, plant and equipment, net			1,307.6	1,325.6
Investment in subsidiaries			1,966.6	1,931.1
Inter-company accounts			0	0
Operating lease assets			222.2
Other non-current assets			57.1	54.3
TOTAL ASSETS			5,495.2	5,233.6
Current liabilities:
Accounts payable			690.7	722.5
Accrued liabilities			194.6	251.5
Current portion of operating lease liabilities			52.9
Current portion of pension and other postretirement benefit obligations			37.9	38.4
Total current liabilities			976.1	1,012.4
Non-current liabilities:
Long-term debt			2,037.7	1,993.7
Long-term operating lease liabilities			190.8
Pension and other postretirement benefit obligations			821.5	827
Inter-company accounts			4,431.9	4,312.3
Other non-current liabilities			142.2	105.6
TOTAL LIABILITIES			8,600.2	8,251
Equity [Abstract]
Total stockholders’ equity (deficit)			(3,105)	(3,017.4)
Noncontrolling interests			0	0
TOTAL EQUITY			(3,105)	(3,017.4)
TOTAL LIABILITIES AND EQUITY			5,495.2	5,233.6
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	(35.7)	45.7
Cash flows from investing activities:
Capital investments	(32.9)	(31.4)
Other investing items, net	11.6	0
Net cash flows from investing activities	(21.3)	(31.4)
Cash flows from financing activities:
Net borrowings (payments) under credit facility	45	(10)
Redemption of long-term debt	(4)	0
Inter-company activity	15.3	(6.2)
SunCoke Middletown distributions to noncontrolling interest owners	0	0
Other financing items, net	(0.9)	0.1
Net cash flows from financing activities	55.4	(16.1)
Net increase (decrease) in cash and cash equivalents	(1.6)	(1.8)
Cash and cash equivalents, beginning of period	22.1	14.5
Cash and equivalents, end of period	22.1	14.5	20.5	22.1	12.7
Guarantor Subsidiaries [Member]
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	83.5	77.1
Cost of products sold (exclusive of items shown separately below)	59.3	54.6
Selling and administrative expenses	3.9	3.6
Depreciation	2.1	2
Ashland Works closure	0
Total operating costs	65.3	60.2
Operating profit (loss)	18.2	16.9
Interest expense	0	0
Pension and OPEB (income) expense		0
Other (income) expense	(5)	(3.5)
Income (loss) before income taxes	23.2	20.4
Income tax expense (benefit)	5.8	5.1
Equity in net income (loss) of subsidiaries	0	0
Net income	17.4	15.3
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to AK Steel Holding Corporation	17.4	15.3
Other comprehensive income (loss)	0	0
Comprehensive income (loss) attributable to AK Steel Holding Corporation	17.4	15.3
Current assets:
Cash and cash equivalents			4.6	8.2
Accounts receivable, net			39.5	34
Inventory			55.7	53.9
Other current assets			0.1	0.1
Total current assets			99.9	96.2
Property, plant and equipment			191.3	189.7
Accumulated depreciation			(104.9)	(102.8)
Property, plant and equipment, net			86.4	86.9
Investment in subsidiaries			0	0
Inter-company accounts			1,669.5	1,630.7
Operating lease assets			2.9
Other non-current assets			32.9	32.9
TOTAL ASSETS			1,891.6	1,846.7
Current liabilities:
Accounts payable			29.3	26.2
Accrued liabilities			6.9	8.7
Current portion of operating lease liabilities			0.9
Current portion of pension and other postretirement benefit obligations			0	0
Total current liabilities			37.1	34.9
Non-current liabilities:
Long-term debt			0	0
Long-term operating lease liabilities			1.9
Pension and other postretirement benefit obligations			0	0
Inter-company accounts			0	0
Other non-current liabilities			0.2	0.2
TOTAL LIABILITIES			39.2	35.1
Equity [Abstract]
Total stockholders’ equity (deficit)			1,852.4	1,811.6
Noncontrolling interests			0	0
TOTAL EQUITY			1,852.4	1,811.6
TOTAL LIABILITIES AND EQUITY			1,891.6	1,846.7
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	13	4.8
Cash flows from investing activities:
Capital investments	(1.2)	(0.9)
Other investing items, net	0	0
Net cash flows from investing activities	(1.2)	(0.9)
Cash flows from financing activities:
Net borrowings (payments) under credit facility	0	0
Redemption of long-term debt	0	0
Inter-company activity	(15.4)	(7)
SunCoke Middletown distributions to noncontrolling interest owners	0	0
Other financing items, net	0	0
Net cash flows from financing activities	(15.4)	(7)
Net increase (decrease) in cash and cash equivalents	(3.6)	(3.1)
Cash and cash equivalents, beginning of period	8.2	7.2
Cash and equivalents, end of period	8.2	7.2	4.6	8.2	4.1
Other Non-Guarantor Subsidiaries [Member]
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	185.4	208.7
Cost of products sold (exclusive of items shown separately below)	151.9	171.7
Selling and administrative expenses	9.7	8.7
Depreciation	12.6	9.5
Ashland Works closure	0
Total operating costs	174.2	189.9
Operating profit (loss)	11.2	18.8
Interest expense	1.6	1.2
Pension and OPEB (income) expense		0
Other (income) expense	(1.1)	(1.6)
Income (loss) before income taxes	10.7	19.2
Income tax expense (benefit)	0.4	2.4
Equity in net income (loss) of subsidiaries	0.1	0
Net income	10.4	16.8
Less: Net income attributable to noncontrolling interests	12.6	16.1
Net income attributable to AK Steel Holding Corporation	(2.2)	0.7
Other comprehensive income (loss)	(0.7)	1.1
Comprehensive income (loss) attributable to AK Steel Holding Corporation	(2.9)	1.8
Current assets:
Cash and cash equivalents			16.1	18.3
Accounts receivable, net			111.9	95.3
Inventory			77.8	75.6
Other current assets			14.1	11.4
Total current assets			219.9	200.6
Property, plant and equipment			675.8	668.4
Accumulated depreciation			(180.1)	(169.3)
Property, plant and equipment, net			495.7	499.1
Investment in subsidiaries			68.3	68.2
Inter-company accounts			0	0
Operating lease assets			28.9
Other non-current assets			307	315.6
TOTAL ASSETS			1,119.8	1,083.5
Current liabilities:
Accounts payable			62.5	55.5
Accrued liabilities			23.7	28.7
Current portion of operating lease liabilities			2.3
Current portion of pension and other postretirement benefit obligations			0.3	0.3
Total current liabilities			88.8	84.5
Non-current liabilities:
Long-term debt			0	0
Long-term operating lease liabilities			27.6
Pension and other postretirement benefit obligations			2.7	2.9
Inter-company accounts			515.2	511.2
Other non-current liabilities			28	28.2
TOTAL LIABILITIES			662.3	626.8
Equity [Abstract]
Total stockholders’ equity (deficit)			121.7	127.1
Noncontrolling interests			335.8	329.6
TOTAL EQUITY			457.5	456.7
TOTAL LIABILITIES AND EQUITY			1,119.8	1,083.5
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	13.4	11.1
Cash flows from investing activities:
Capital investments	(10.7)	(5.6)
Other investing items, net	0	0
Net cash flows from investing activities	(10.7)	(5.6)
Cash flows from financing activities:
Net borrowings (payments) under credit facility	0	0
Redemption of long-term debt	0	0
Inter-company activity	1.5	16.2
SunCoke Middletown distributions to noncontrolling interest owners	(6.4)	(10.3)
Other financing items, net	0	0
Net cash flows from financing activities	(4.9)	5.9
Net increase (decrease) in cash and cash equivalents	(2.2)	11.4
Cash and cash equivalents, beginning of period	18.3	16.3
Cash and equivalents, end of period	18.3	16.3	16.1	18.3	27.7
Consolidation, Eliminations [Member]
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales	(120.6)	(129.9)
Cost of products sold (exclusive of items shown separately below)	(107.8)	(116)
Selling and administrative expenses	(12.2)	(11.8)
Depreciation	0	0
Ashland Works closure	0
Total operating costs	(120)	(127.8)
Operating profit (loss)	(0.6)	(2.1)
Interest expense	0	0
Pension and OPEB (income) expense		0
Other (income) expense	0	0
Income (loss) before income taxes	(0.6)	(2.1)
Income tax expense (benefit)	(0.2)	(0.5)
Equity in net income (loss) of subsidiaries	(11.7)	(44.4)
Net income	(12.1)	(46)
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to AK Steel Holding Corporation	(12.1)	(46)
Other comprehensive income (loss)	5.6	5.6
Comprehensive income (loss) attributable to AK Steel Holding Corporation	(6.5)	(40.4)
Current assets:
Cash and cash equivalents			0	0
Accounts receivable, net			(22.3)	(8.9)
Inventory			(9.8)	(9.2)
Other current assets			0	0
Total current assets			(32.1)	(18.1)
Property, plant and equipment			0	0
Accumulated depreciation			0	0
Property, plant and equipment, net			0	0
Investment in subsidiaries			1,070.1	1,018.1
Inter-company accounts			(4,868.5)	(4,748)
Operating lease assets			0
Other non-current assets			0	0
TOTAL ASSETS			(3,830.5)	(3,748)
Current liabilities:
Accounts payable			(14.3)	(3.2)
Accrued liabilities			0	0
Current portion of operating lease liabilities			0
Current portion of pension and other postretirement benefit obligations			0	0
Total current liabilities			(14.3)	(3.2)
Non-current liabilities:
Long-term debt			0	0
Long-term operating lease liabilities			0
Pension and other postretirement benefit obligations			0	0
Inter-company accounts			(4,947.1)	(4,823.5)
Other non-current liabilities			0	0
TOTAL LIABILITIES			(4,961.4)	(4,826.7)
Equity [Abstract]
Total stockholders’ equity (deficit)			1,130.9	1,078.7
Noncontrolling interests			0	0
TOTAL EQUITY			1,130.9	1,078.7
TOTAL LIABILITIES AND EQUITY			(3,830.5)	(3,748)
Condensed Consolidated Statements of Cash Flows [Abstract]
Net cash flows from operating activities	2.5	5
Cash flows from investing activities:
Capital investments	0	0
Other investing items, net	0	0
Net cash flows from investing activities	0	0
Cash flows from financing activities:
Net borrowings (payments) under credit facility	0	0
Redemption of long-term debt	0	0
Inter-company activity	(2.5)	(5)
SunCoke Middletown distributions to noncontrolling interest owners	0	0
Other financing items, net	0	0
Net cash flows from financing activities	(2.5)	(5)
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and equivalents, end of period	$ 0	$ 0	$ 0	$ 0	$ 0