SunCoke Energy (SXC) 10-Q 1 Nov 23 2023 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-35243
Entity Registrant Name	SUNCOKE ENERGY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-0640593
Entity Address, Address Line One	1011 Warrenville Road
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Lisle
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60532
City Area Code	630
Local Phone Number	824-1000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SXC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		83,756,217
Entity Central Index Key	0001514705
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Sales and other operating revenue	$ 520.4	$ 516.8	$ 1,542.6	$ 1,458.5
Costs and operating expenses
Cost of products sold and operating expenses	436.1	413.4	1,281.2	1,163.2
Selling, general and administrative expenses	19.1	20.1	55.3	57.9
Depreciation and amortization expense	35.5	35.7	107.2	106.7
Total costs and operating expenses	490.7	469.2	1,443.7	1,327.8
Operating income	29.7	47.6	98.9	130.7
Interest expense, net	6.6	8	21	24.3
Income before income tax expense (benefit)	23.1	39.6	77.9	106.4
Income tax expense (benefit)	14.6	(2.9)	29.7	14.3
Net income	8.5	42.5	48.2	92.1
Less: Net income attributable to noncontrolling interests	1.5	1.1	4.5	3.2
Net income attributable to SunCoke Energy, Inc.	$ 7	$ 41.4	$ 43.7	$ 88.9
Earnings attributable to SunCoke Energy, Inc. per common share:
Basic (in dollars per share)	$ 0.08	$ 0.49	$ 0.52	$ 1.06
Diluted (in dollars per share)	$ 0.08	$ 0.49	$ 0.51	$ 1.05
Weighted average number of common shares outstanding:
Basic (in shares)	84.8	83.9	84.7	83.8
Diluted (in shares)	85.1	84.7	84.9	84.5

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 8.5	$ 42.5	$ 48.2	$ 92.1
Other comprehensive income (loss):
Reclassifications of prior service benefit and actuarial loss amortization to earnings, net of tax	0	0.1	0.1	0.3
Currency translation adjustment	(0.3)	(0.3)	0.2	0
Comprehensive income	8.2	42.3	48.5	92.4
Less: Comprehensive income attributable to noncontrolling interests	1.5	1.1	4.5	3.2
Comprehensive income attributable to SunCoke Energy, Inc.	$ 6.7	$ 41.2	$ 44	$ 89.2

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 125.9	$ 90
Receivables, net	81.5	104.8
Inventories	206.8	175.2
Other current assets	7.1	4
Total current assets	421.3	374
Properties, plants and equipment (net of accumulated depreciation of $1,365.9 million and $1,276.0 million at September 30, 2023 and December 31, 2022, respectively)	1,205.4	1,229.3
Intangible assets, net	31.6	33.2
Deferred charges and other assets	20.9	18.1
Total assets	1,679.2	1,654.6
Liabilities and Equity
Accounts payable	182.3	159.3
Accrued liabilities	54.9	60.8
Current portion of financing obligation	6.3	3.3
Interest payable	6.1	0
Income tax payable	1.3	0.6
Total current liabilities	250.9	224
Long-term debt and financing obligation	489.8	528.9
Accrual for black lung benefits	54.1	52.2
Retirement benefit liabilities	15.3	16.4
Deferred income taxes	188.1	172.3
Asset retirement obligations	13.8	13.4
Other deferred credits and liabilities	25.4	24.7
Total liabilities	1,037.4	1,031.9
Equity
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at both September 30, 2023 and December 31, 2022	0	0
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 99,160,699 and 98,815,780 shares at September 30, 2023 and December 31, 2022, respectively	1	1
Treasury stock, 15,404,482 shares at both September 30, 2023 and December 31, 2022	(184)	(184)
Additional paid-in capital	729	728.1
Accumulated other comprehensive loss	(12.7)	(13)
Retained earnings	75	53.5
Total SunCoke Energy, Inc. stockholders’ equity	608.3	585.6
Noncontrolling interest	33.5	37.1
Total equity	641.8	622.7
Total liabilities and equity	$ 1,679.2	$ 1,654.6

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accumulated depreciation	$ 1,365.9	$ 1,276
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares, issued (in shares)	99,160,699	98,815,780
Treasury stock, shares (in shares)	15,404,482	15,404,482

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities
Net income	$ 48.2	$ 92.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	107.2	106.7
Deferred income tax expense	15.8	1.8
Share-based compensation expense	4.3	5
Changes in working capital pertaining to operating activities:
Receivables, net	24.3	(44.7)
Inventories	(31.3)	(77.8)
Accounts payable	25.5	26.5
Accrued liabilities	(6.2)	2.4
Interest payable	6.1	6.2
Income taxes	0.7	1.8
Other operating activities	(2)	0.6
Net cash provided by operating activities	192.6	120.6
Cash Flows from Investing Activities
Capital expenditures	(84.5)	(55.7)
Other investing activities	(0.9)	3.6
Net cash used in investing activities	(85.4)	(52.1)
Cash Flows from Financing Activities
Proceeds from revolving facility	273	450
Repayment of revolving facility	(308)	(498)
Repayment of financing obligation	(2.5)	(2.4)
Dividends paid	(22.3)	(16.9)
Cash distribution to noncontrolling interests	(8.1)	(4.4)
Other financing activities	(3.4)	(1.3)
Net cash used in financing activities	(71.3)	(73)
Net increase (decrease) in cash and cash equivalents	35.9	(4.5)
Cash and cash equivalents at beginning of period	90	63.8
Cash and cash equivalents at end of period	125.9	59.3
Supplemental Disclosure of Cash Flow Information
Interest paid	13.4	15.4
Income taxes paid	$ 13.1	$ 10.8

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Millions	Total	Total  SunCoke Energy, Inc.  Equity	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained (Deficit) Earnings	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2021			98,496,809
Beginning balance at Dec. 31, 2021	$ 535.4	$ 498.1	$ 1	$ (184)	$ 721.2	$ (16.7)	$ (23.4)	$ 37.3
Treasury stock, beginning balance (in shares) at Dec. 31, 2021				15,404,482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	92.1	88.9					88.9	3.2
Reclassifications of prior service benefit and actuarial loss amortization to earnings, net of tax	0.3	0.3				0.3
Currency translation adjustment	0
Share-based compensation	6.4	6.4			6.4
Share issuances, net of shares withheld for taxes (in shares)			309,986
Share issuances, net of shares withheld for taxes	(1.2)	(1.2)			(1.2)
Dividends	(17)	(17)					(17)
Cash distribution to noncontrolling interests	(4.4)							(4.4)
Ending balance (in shares) at Sep. 30, 2022			98,806,795
Ending balance at Sep. 30, 2022	611.6	575.5	$ 1	$ (184)	726.4	(16.4)	48.5	36.1
Treasury stock, ending balance (in shares) at Sep. 30, 2022				15,404,482
Beginning balance (in shares) at Jun. 30, 2022			98,795,825
Beginning balance at Jun. 30, 2022	574.1	539.1	$ 1	$ (184)	724.4	(16.2)	13.9	35
Treasury stock, beginning balance (in shares) at Jun. 30, 2022				15,404,482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42.5	41.4					41.4	1.1
Reclassifications of prior service benefit and actuarial loss amortization to earnings, net of tax	0.1	0.1				0.1
Currency translation adjustment	(0.3)	(0.3)				(0.3)
Share-based compensation	2	2			2
Share issuances, net of shares withheld for taxes (in shares)			10,970
Dividends	(6.8)	(6.8)					(6.8)
Ending balance (in shares) at Sep. 30, 2022			98,806,795
Ending balance at Sep. 30, 2022	611.6	575.5	$ 1	$ (184)	726.4	(16.4)	48.5	36.1
Treasury stock, ending balance (in shares) at Sep. 30, 2022				15,404,482
Beginning balance (in shares) at Dec. 31, 2022			98,815,780
Beginning balance at Dec. 31, 2022	$ 622.7	585.6	$ 1	$ (184)	728.1	(13)	53.5	37.1
Treasury stock, beginning balance (in shares) at Dec. 31, 2022	15,404,482			15,404,482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 48.2	43.7					43.7	4.5
Reclassifications of prior service benefit and actuarial loss amortization to earnings, net of tax	0.1	0.1				0.1
Currency translation adjustment	0.2	0.2				0.2
Share-based compensation	4.3	4.3			4.3
Share issuances, net of shares withheld for taxes (in shares)			344,919
Share issuances, net of shares withheld for taxes	(3.4)	(3.4)			(3.4)
Dividends	(22.2)	(22.2)					(22.2)
Cash distribution to noncontrolling interests	(8.1)							(8.1)
Ending balance (in shares) at Sep. 30, 2023			99,160,699
Ending balance at Sep. 30, 2023	$ 641.8	608.3	$ 1	$ (184)	729	(12.7)	75	33.5
Treasury stock, ending balance (in shares) at Sep. 30, 2023	15,404,482			15,404,482
Beginning balance (in shares) at Jun. 30, 2023			99,160,699
Beginning balance at Jun. 30, 2023	$ 642.4	609	$ 1	$ (184)	727.9	(12.4)	76.5	33.4
Treasury stock, beginning balance (in shares) at Jun. 30, 2023				15,404,482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8.5	7					7	1.5
Currency translation adjustment	(0.3)	(0.3)				(0.3)
Share-based compensation	1.1	1.1			1.1
Dividends	(8.5)	(8.5)					(8.5)
Cash distribution to noncontrolling interests	(1.4)							(1.4)
Ending balance (in shares) at Sep. 30, 2023			99,160,699
Ending balance at Sep. 30, 2023	$ 641.8	$ 608.3	$ 1	$ (184)	$ 729	$ (12.7)	$ 75	$ 33.5
Treasury stock, ending balance (in shares) at Sep. 30, 2023	15,404,482			15,404,482

General

General	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	1. General Description of Business SunCoke Energy, Inc. (“SunCoke Energy,” “SunCoke,” “Company,” “we,” “our” and “us”) is the largest independent producer of high-quality coke in the Americas, as measured by tons of coke produced each year, and has more than 60 years of coke production experience. Coke is produced by heating metallurgical coal in a refractory oven, which releases certain volatile components from the coal, thus transforming the coal into coke. Our coke is primarily used as a principal raw material in the blast furnace steelmaking process as well as in the foundry production of casted iron, and the majority of our sales are derived from blast furnace coke sales made under long-term, take-or-pay agreements. We also export coke to international customers seeking high-quality product for their blast furnaces. We have designed, developed and built, and we currently own and operate, five cokemaking facilities in the United States (“U.S.”) with collective nameplate capacity to produce approximately 4.2 million tons of blast furnace coke per year. Additionally, we designed and currently operate one cokemaking facility in Brazil under licensing and operating agreements on behalf of ArcelorMittal Brasil S.A. (“ArcelorMittal Brazil”), which has approximately 1.7 million tons of annual cokemaking capacity. Our cokemaking ovens utilize efficient, modern heat recovery technology designed to combust the coal’s volatile components liberated during the cokemaking process and use the resulting heat to create steam or electricity for sale. We also own and operate a logistics business that provides export and domestic material handling and/or mixing services to steel, coke (including some of our domestic cokemaking facilities), electric utility, coal producing and other manufacturing based customers. Our logistics terminals, which are strategically located to reach Gulf Coast, East Coast, Great Lakes and international ports, have the collective capacity to mix and/or transload more than 40 million tons of coal and other aggregates annually and has storage capacity of approximately 3 million tons. Basis of Presentation The accompanying unaudited consolidated financial statements included herein have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim reporting. Certain information and disclosures normally included in financial statements have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In management’s opinion, the financial statements reflect all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results of operations, financial position and cash flows for the periods presented. The results of operations for the period ended September 30, 2023 are not necessarily indicative of the operating results expected for the entire year. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2022.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Inventories	2. Inventories The components of inventories were as follows: September 30, 2023 December 31, 2022 (Dollars in millions) Coal $ 127.8 $ 109.4 Coke 21.5 14.3 Materials, supplies and other 57.5 51.5 Total inventories $ 206.8 $ 175.2

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	3. Intangible Assets Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both September 30, 2023 and December 31, 2022, and other intangibles detailed in the table below, excluding fully amortized intangible assets. September 30, 2023 December 31, 2022 Weighted - Average Remaining Amortization Years Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net (Dollars in millions) Customer relationships 1 $ 6.7 $ 6.0 $ 0.7 $ 6.7 $ 5.6 $ 1.1 Permits 19 31.7 5.6 26.1 31.7 4.5 27.2 Other 27 1.6 0.2 1.4 1.6 0.1 1.5 Total $ 40.0 $ 11.8 $ 28.2 $ 40.0 $ 10.2 $ 29.8 Total amortization expense for intangible assets subject to amortization was $0.5 million for both the three months ended September 30, 2023 and 2022, and $1.6 million and $1.5 million for the nine months ended September 30, 2023 and 2022, respectively.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	4. Income Taxes At the end of each interim period, we make our best estimate of the annual effective tax rate and the impact of discrete items, if any, and adjust the rate as necessary. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Income before income tax expense (benefit) $ 23.1 $ 39.6 $ 77.9 $ 106.4 Income tax expense (benefit) 14.6 (2.9) 29.7 14.3 Effective tax rate 63.2 % (7.3) % 38.1 % 13.4 % During the three months ended September 30, 2023, the Company established an $8.5 million valuation allowance, which was a portion of an $11.3 million valuation allowance that was released during the third quarter of 2022 on deferred tax assets attributable to existing foreign tax credit carryforwards. The release of the valuation allowance during the third quarter of 2022 was a result of new regulations published in 2022 by the U.S. Treasury (2022 Foreign Tax Credit ( “ FTC ” ) final regulations) that made foreign taxes paid in future years to certain countries, including Brazil, no longer creditable in the U.S. After tax planning in 2022, the Company expected to be able to utilize its existing foreign tax credits carried forward from prior years. During the third quarter of 2023, Brazil enacted new legislation that aligned the Brazil transfer pricing law with the 2022 OECD Guidelines. As a result, the Company has determined that Brazil taxes paid or accrued in 2024 and forward will become creditable under the 2022 final FTC regulations. Due to the change in the Brazilian tax law, the FTCs that are projected to be created will cause $8.5 million of the foreign tax credit carryforward from prior years to not be utilized, resulting in the establishment of the valuation allowance during the three and nine months ended September 30, 2023. Also during the third quarter of 2023, the IRS issued Notice 2023-55 that generally allows taxpayers to defer the application of the of the 2022 FTC final regulations until 2024. As allowed under the notice, the Company elected not to defer the application of the 2022 FTC final regulations. The Company also recognized deferred tax benefits of $4.6 million from research and development tax credits during the three and nine months ended September 30, 2022. Additionally, income taxes recorded during the nine months ended September 30, 2022 included the revaluation of certain deferred tax liabilities due to changes in apportioned state tax rates, which resulted in an income tax benefit of $1.0 million recorded during the first quarter of 2022 . Before the impact of discrete items described above, the Company's effective tax rate was 26.1 percent and 27.2 percent for the three and nine months ended September 30, 2023, respectively, and 32.3 percent and 29.1 percent for the three and nine months ended September 30, 2022, respectively. The difference between the Company's effective tax rates and federal statutory rate of 21.0 percent during all periods presented reflect the impact of state taxes, compensation deduction limitations under Section 162(m) of the Internal Revenue Code as well as the impact of foreign taxes as a result of regulations published by the U.S. Treasury in 2022 and noted above.

Accrued Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 30, 2023
Payables and Accruals [Abstract]
Accrued Liabilities	5. Accrued Liabilities Accrued liabilities consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Accrued benefits $ 21.6 $ 29.7 Current portion of postretirement benefit obligation 2.4 2.4 Other taxes payable 12.8 9.8 Current portion of black lung liability 5.9 5.9 Accrued legal 0.6 4.9 Accrued losses on purchase commitments (1) 6.0 — Other 5.6 8.1 Total accrued liabilities $ 54.9 $ 60.8 (1) Reflects lower of cost or net realizable value adjustments of $6.0 million on purchase commitments of coal inventory.

Debt and Financing Obligation

Debt and Financing Obligation	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt and Financing Obligation	6. Debt and Financing Obligation Total debt and financing obligation, including the current portion of the financing obligation, consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) 4.875 percent senior notes, due 2029 (“2029 Senior Notes”) $ 500.0 $ 500.0 $350.0 revolving credit facility, due 2026 (“Revolving Facility”) — 35.0 5.346 percent financing obligation, due 2024 6.3 8.8 Total borrowings $ 506.3 $ 543.8 Debt issuance costs (10.2) (11.6) Total debt and financing obligation $ 496.1 $ 532.2 Less: current portion of financing obligation 6.3 3.3 Total long-term debt and financing obligation $ 489.8 $ 528.9 Revolving Facility As of September 30, 2023, the Revolving Facility had no outstanding balance, leaving $350.0 million available. Additionally, the Company has certain letters of credit totaling $21.7 million, which do not reduce the Revolving Facility's available balance. Covenants Under the terms of the Revolving Facility, the Company is subject to a maximum consolidated net leverage ratio of 4.50:1.00 and a minimum consolidated interest coverage ratio of 2.50:1.00. The Company's debt agreements contain other covenants and events of default that are customary for similar agreements and may limit our ability to take various actions including our ability to pay a dividend or repurchase our stock. If we fail to perform our obligations under these and other covenants, the lenders' credit commitment could be terminated and any outstanding borrowings, together with accrued interest, under the Revolving Facility could be declared immediately due and payable. The Company has a cross default provision that applies to our indebtedness having a principal amount in excess of $35.0 million.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	7. Commitments and Contingent Liabilities Legal Matters The Company is a party to certain pending and threatened claims, including matters related to commercial disputes, employment claims, personal injury claims, common law tort claims, and environmental claims. Although the ultimate outcome of these claims cannot be ascertained at this time, it is reasonably possible that some portion of these claims could be resolved unfavorably to the Company. Management of the Company believes that any liability which may arise from these claims would likely not have a material adverse impact on our consolidated financial statements. SunCoke's threshold for disclosing material environmental legal proceedings involving a government authority where potential monetary sanctions are involved is $1 million. Black Lung Benefit Liabilities The Company has obligations related to coal workers’ pneumoconiosis, or black lung, to provide benefits to certain of its former coal miners and their dependents. Such benefits are provided for under Title IV of the Federal Coal Mine and Safety Act of 1969 and subsequent amendments, as well as for black lung benefits provided in the states of Virginia, Kentucky and West Virginia pursuant to workers’ compensation legislation. The Patient Protection and Affordable Care Act (“PPACA”), which was implemented in 2010 and amended previous legislation related to coal workers’ black lung obligations, provides for the automatic extension of awarded lifetime benefits to surviving spouses and changes the legal criteria used to assess and award claims. We adjust our liability each year based upon actuarial calculations of our expected future payments for these benefits. Our independent actuarial consultants calculate the present value of the estimated black lung liability annually based on actuarial models utilizing our population of former coal miners, historical payout patterns of both the Company and the industry, actuarial mortality rates, medical costs, death benefits, dependents, discount rates and the current federally mandated payout rates. The estimated liability may be impacted by future changes in the statutory mechanisms, modifications by court decisions and changes in filing patterns by claimants and their advisors, the impact of which cannot be estimated. The following table summarizes the discount rate utilized, active claims and the total black lung liabilities as of December 31, 2022. Our independent actuarial consultants calculate the present value of the black lung liability annually in the fourth quarter, unless there are changes in facts and circumstances that could materially alter the amount of the liability. Therefore, the discount rate and active claims data utilized to estimate the liability as of December 31, 2022 are not updated as of September 30, 2023. Changes in the black lung liability from December 31, 2022 to September 30, 2023 are a result of actual black lung benefit payments made of $4.1 million and accretion of the black lung liability of $6.0 million during the nine months ended September 30, 2023. The black lung liability at September 30, 2023 was $60.0 million. December 31, 2022 Discount rate (1) 4.9 % Active claims 332 Total black lung liability, discounted (dollars in millions) (2) $ 58.1 Total black lung liability, undiscounted (dollars in millions) $ 88.4 (1) The discount rate is determined based on a portfolio of high-quality corporate bonds with maturities that are consistent with the estimated duration of our black lung obligations. A decrease of 25 basis points in the discount rate would have increased black lung expense by $1.1 million in 2022. (2) The current portion of the black lung liability was $5.9 million at both September 30, 2023 and December 31, 2022, and is included in accrued liabilities on the Consolidated Balance Sheets. Expected payments for each of the five succeeding years and the aggregate amount thereafter as of December 31, 2022: (Dollars in millions) 2023 $ 5.9 2024 4.7 2025 5.2 2026 4.7 2027 4.4 2028-Thereafter 63.5 Total $ 88.4 The following table reconciles the expected aggregate undiscounted amount to amounts recognized in Consolidated Balance Sheets: December 31, 2022 (Dollars in millions) Black lung liability, undiscounted $ 88.4 Impact of discounting (30.3) Black lung liability, discounted $ 58.1

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	8. Share-Based Compensation Equity Classified Awards During the nine months ended September 30, 2023, the Company granted share-based compensation to eligible participants under the SunCoke Energy, Inc. Omnibus Long-Term Incentive Plan (the “Omnibus Plan”). All awards vest immediately upon a qualifying termination of employment, as defined by the Omnibus Plan, following a change in control. Restricted Stock Units Settled in Shares During the nine months ended September 30, 2023, the Company issued 352,646 restricted stock units (“RSUs”) to certain employees and members of the Board of Directors, to be settled in shares of the Company’s common stock. The weighted average grant date fair value was $8.97 per unit, and was based on the closing price of our common stock on the date of grant. RSUs granted to employees vest and become issuable in three annual installments beginning one year from the date of grant. The service period for certain retiree eligible participants is accelerated. RSUs granted to the Company's Board of Directors vest upon grant, but are paid out upon termination of board service. Performance Share Units Performance share units (“PSUs”) were granted to certain employees to be settled in shares of the Company's common stock during the nine months ended September 30, 2023, for which the service period will end on December 31, 2025, and will vest and become issuable during the first quarter of 2026. The service period for certain retiree eligible participants is accelerated. The Company granted the following PSUs: Shares Weighted Average Grant Date Fair Value per Unit PSUs (1)(2) 147,232 $ 9.84 (1) Performance measures for the PSU awards are split 50/50 between the Company's three-year cumulative Adjusted EBITDA (as defined in Note 12 to the consolidated financial statements with the exception of the corporate/other expenses adjustment) and the Company's three-year average pre-tax return on capital for its coke and logistics businesses and unallocated corporate expenses. (2) The number of PSUs ultimately awarded will be determined by the above performance measures versus targets and the Company's three-year total shareholder return (“TSR”) as compared to the TSR of the companies making up the Nasdaq Iron & Steel Index (“TSR Modifier”). The TSR Modifier can impact the payout between 80 percent and 120 percent of the Company's final performance measure results. Each PSU award may vest between 25 percent and 200 percent of the original units granted. The fair value of the PSUs granted during the nine months ended September 30, 2023 is based on the closing price of our common stock on the date of grant as well as a Monte Carlo simulation for the valuation of the TSR Modifier. Liability Classified Awards Restricted Stock Units Settled in Cash During the nine months ended September 30, 2023, the Company issued 216,547 restricted stock units to certain employees to be settled in cash (“Cash RSUs”), which vest and become payable in three annual installments beginning one year from the grant date. The weighted average grant date fair value of the Cash RSUs granted during the nine months ended September 30, 2023 was $9.24 per unit, based on the closing price of our common stock on the date of grant. The Cash RSUs liability is adjusted based on the closing price of our common stock at the end of each quarterly period and was $2.2 million at September 30, 2023 and $2.4 million at December 31, 2022. Cash Incentive Awards The Company also granted long-term cash compensation to eligible participants under the Omnibus Plan. All awards vest immediately upon a qualifying termination of employment, as defined by the Omnibus Plan, following a change in control. The cash incentive award liability is included in accrued liabilities and other deferred credits and liabilities on the Consolidated Balance Sheets. The Company issued awards with an aggregate grant date fair value of approximately $2.2 million during the nine months ended September 30, 2023, for which the service period will end on December 31, 2025 and will vest and become payable during the first quarter of 2026. The service period for certain retiree eligible participants is accelerated. The performance measures for these awards are split 50/50 between the Company's three-year cumulative Adjusted EBITDA and the Company's three-year average pre-tax return on capital for its coke and logistics businesses and unallocated corporate expenses. The cash incentive award liability at September 30, 2023 was adjusted based on the Company's three-year cumulative Adjusted EBITDA and adjusted average pre-tax return on capital for the Company's coke and logistics businesses and unallocated corporate expenses. The cash incentive award liability was $7.7 million at September 30, 2023 and $8.7 million at December 31, 2022. Summary of Share-Based Compensation Expense Below is a summary of the compensation expense, unrecognized compensation costs, and the period for which the unrecognized compensation cost is expected to be recognized over: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 September 30, 2023 Compensation Expense (1) Unrecognized Compensation Cost Weighted Average Remaining Recognition Period (Dollars in millions) (Years) Equity Awards: RSUs $ 0.8 $ 0.6 $ 1.8 $ 1.6 $ 1.4 1.1 PSUs 0.3 1.2 1.8 3.0 0.9 1.7 Total equity awards $ 1.1 $ 1.8 $ 3.6 $ 4.6 Liability Awards: Cash RSUs $ 0.9 $ 0.1 $ 1.9 $ 1.0 $ 2.0 1.7 Cash incentive award 0.6 1.5 2.3 3.9 2.0 1.7 Total liability awards $ 1.5 $ 1.6 $ 4.2 $ 4.9 (1) Compensation expense recognized by the Company is included in selling, general and administrative expenses on the Consolidated Statements of Income. The Company issued $0.7 million and $0.4 million of share based compensation to the Company's Board of Directors during the nine months ended September 30, 2023 and 2022, respectively.

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings per Share	9. Earnings per Share Basic earnings per share (“EPS”) has been computed by dividing net income attributable to SunCoke Energy, Inc. by the weighted average number of shares outstanding during the period. Except where the result would be anti-dilutive, diluted EPS has been computed to give effect to share-based compensation awards using the treasury stock method. The following table sets forth the reconciliation of the weighted-average number of common shares used to compute basic EPS to those used to compute diluted EPS: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Shares in millions) Weighted-average number of common shares outstanding-basic 84.8 83.9 84.7 83.8 Add: Effect of dilutive share-based compensation awards 0.3 0.8 0.2 0.7 Weighted-average number of shares-diluted 85.1 84.7 84.9 84.5 The following table shows equity awards that are excluded from the computation of diluted EPS as the shares would have been anti-dilutive: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Shares in millions) Stock options $ 1.2 $ 1.6 $ 1.3 $ 1.7 Total $ 1.2 $ 1.6 $ 1.3 $ 1.7

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement	10. Fair Value Measurement The Company measures certain financial and non-financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. Fair value disclosures are reflected in a three-level hierarchy, maximizing the use of observable inputs and minimizing the use of unobservable inputs. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability on the measurement date. The three levels are defined as follows: • Level 1 - inputs to the valuation methodology are quoted prices (unadjusted) for an identical asset or liability in an active market. • Level 2 - inputs to the valuation methodology include quoted prices for a similar asset or liability in an active market or model-derived valuations in which all significant inputs are observable for substantially the full term of the asset or liability. • Level 3 - inputs to the valuation methodology are unobservable and significant to the fair value measurement of the asset or liability. Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Cash and Cash Equivalents Certain assets and liabilities are measured at fair value on a recurring basis. The Company's cash and cash equivalents were measured at fair value at September 30, 2023 and December 31, 2022 based on quoted prices in active markets for identical assets. These inputs are classified as Level 1 within the valuation hierarchy. Certain Financial Assets and Liabilities not Measured at Fair Value At September 30, 2023 and December 31, 2022, the fair value of the Company’s total debt was estimated to be $430.0 million and $471.9 million, respectively, compared to a carrying am ount of $506.3 million and $543.8 million, respectively. The fair value was estimated by management based upon estimates of debt pricing provided by financial institutions, which are considered Level 2 inputs.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	11. Revenue from Contracts with Customers Cokemaking Our blast furnace coke sales are largely made pursuant to long-term, take-or-pay coke sales agreements primarily with Cleveland-Cliffs Steel Holding Corporation and Cleveland-Cliffs Steel LLC, both subsidiaries of Cleveland Cliffs Inc. and collectively referred to as “Cliffs Steel”, United States Steel Corporation (“U.S. Steel”), and Algoma Steel Inc. The take-or-pay provisions in our agreements require our customers to purchase coke volumes as specified in the agreements or pay the contract price for any tonnage they do not purchase. The take-or-pay provisions of our agreements also require us to deliver minimum annual tonnage. As of September 30, 2023, our coke sales agreements have approximately 22.7 million tons of unsatisfied or partially unsatisfied performance obligations, which are expected to be delivered over a weighted average remaining contract term of approximately ten years . While the revenues in our Domestic Coke segment are primarily tied to blast furnace coke sales made under long-term, take-or-pay agreements, we also produce and sell foundry coke out of our Jewell cokemaking facility. Foundry coke sales are generally made under annual agreements with our customers for an agreed upon price and do not contain take-or-pay volume commitments. Non-contracted blast coke sales are produced utilizing capacity in excess of our long-term, take-or-pay agreements and foundry coke. These non-contracted blast coke sales are generally sold on a spot basis at the current market price into the global export and North American coke markets, and do not contain the same provisions as our long-term, take-or-pay agreements. Revenues on all coke sales are recognized when performance obligations to our customers are satisfied in an amount that reflects the consideration that we expect to receive in exchange for the coke. Logistics In our logistics business, handling and/or mixing services are provided to steel, coke (including some of our domestic cokemaking facilities), electric utility, coal producing and other manufacturing based customers. Materials are transported in numerous ways, including rail, truck, barge or ship. We do not take possession of materials handled, but rather act as intermediaries between our customers and end users, deriving our revenues from services provided on a per ton basis. The handling and mixing services consist primarily of two performance obligations, unloading and loading of materials. Revenues are recognized when the customer receives the benefits of the services provided, in an amount that reflects the consideration that we will receive in exchange for those services. Estimated take-or-pay revenue of approximately $28.3 million from all of our multi-year logistics contracts is expected to be recognized over t he next three years fo r unsatisfied or partially unsatisfied performance obligations as of September 30, 2023. Disaggregated Sales and Other Operating Revenue The following table provides disaggregated sales and other operating revenue by product or service, excluding intersegment revenues: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Cokemaking $ 481.3 $ 468.5 $ 1,418.5 $ 1,319.4 Energy 12.5 17.3 36.5 49.0 Logistics 15.4 20.1 55.6 58.4 Operating and licensing fees 9.1 8.9 25.8 27.9 Other 2.1 2.0 6.2 3.8 Sales and other operating revenue $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5 The following tables provide disaggregated sales and other operating revenue by customer: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Cliffs Steel $ 338.7 $ 302.7 $ 1,000.8 $ 861.4 U.S. Steel 79.2 75.2 230.4 209.8 Other 102.5 138.9 311.4 387.3 Sales and other operating revenue $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Business Segment Information	12. Business Segment Information The Company reports its business through three reportable segments: Domestic Coke, Brazil Coke and Logistics. The Domestic Coke segment includes the Jewell, Indiana Harbor, Haverhill, Granite City and Middletown cokemaking facilities. Each of these facilities produces coke, and all facilities except Jewell recover waste heat, which is converted to steam or electricity. The Brazil Coke segment includes the licensing and operating fees payable to us under long-term contracts with ArcelorMittal Brazil, under which we operate a cokemaking facility located in Vitória, Brazil through January 2028. Logistics operations are comprised of Convent Marine Terminal (“CMT”), Kanawha River Terminal (“KRT”), and Lake Terminal, which provides services to our Indiana Harbor cokemaking facility. Handling and mixing results are presented in the Logistics segment. The Company elected to combine Dismal River Terminal (“DRT”) operations into the Jewell cokemaking operations in the Domestic Coke segment beginning January 1, 2023. The DRT results were included in the Logistics segment in 2022 and are not recast. Corporate expenses that can be identified with a segment have been included in determining segment results. The remainder is included in Corporate and Other, which is not a reporting segment, but which also includes activity from our legacy coal mining business. Segment assets are those assets utilized within a specific segment and exclude taxes. The following table includes Adjusted EBITDA reportable segments, as defined below, which is a measure of segment profit or loss reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Domestic Coke $ 495.7 $ 487.7 $ 1,460.4 $ 1,371.8 Brazil Coke 9.1 8.9 25.8 27.9 Logistics 15.6 20.2 56.4 58.8 Logistics intersegment sales 5.6 7.4 16.9 22.2 Elimination of intersegment sales (5.6) (7.4) (16.9) (22.2) Total sales and other operating revenues $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5 Adjusted EBITDA reportable segments: Domestic Coke $ 64.0 $ 76.6 $ 192.6 $ 216.9 Brazil Coke 2.2 3.3 6.9 11.4 Logistics 8.4 12.9 33.6 38.0 Total Adjusted EBITDA reportable segments $ 74.6 $ 92.8 $ 233.1 $ 266.3 Depreciation and amortization expense: Domestic Coke $ 32.1 $ 31.7 $ 97.1 $ 94.9 Brazil Coke 0.1 — 0.2 0.1 Logistics 3.2 3.7 9.7 10.9 Total reportable segments $ 35.4 $ 35.4 $ 107.0 $ 105.9 Corporate and Other 0.1 0.3 0.2 0.8 Total depreciation and amortization expense $ 35.5 $ 35.7 $ 107.2 $ 106.7 Capital expenditures: Domestic Coke $ 32.6 $ 20.6 $ 80.8 $ 51.8 Brazil Coke — — 0.2 0.1 Logistics 1.4 0.5 3.3 3.2 Total reportable segments $ 34.0 $ 21.1 $ 84.3 $ 55.1 Corporate and Other 0.1 0.6 0.2 0.6 Total capital expenditures $ 34.1 $ 21.7 $ 84.5 $ 55.7 The following table sets forth the Company's segment assets: September 30, 2023 December 31, 2022 (Dollars in millions) Segment assets: Domestic Coke $ 1,443.0 $ 1,422.6 Brazil Coke 10.6 15.7 Logistics (1) 160.7 193.5 Total reportable segments $ 1,614.3 $ 1,631.8 Corporate and Other 64.9 22.8 Total assets $ 1,679.2 $ 1,654.6 (1) Logistics segment assets included $21.7 million of DRT assets as of December 31, 2022, which are included in the Domestic Coke segment in 2023. The Company evaluates the performance of its segments based on Adjusted EBITDA reportable segments, which is defined as earnings before interest, taxes, depreciation and amortization, adjusted for any impairments, restructuring costs, gains or losses on extinguishment of debt, transaction costs, and/or corporate/other expenses (“Adjusted EBITDA reportable segments”). Management believes Adjusted EBITDA reportable segments is an important measure in assessing operating performance. Additionally, other companies may calculate Adjusted EBITDA reportable segments differently than we do, limiting its usefulness as a comparative measure. Reconciliation of Adjusted EBITDA Reportable Segments to Net Income Below is a reconciliation of Adjusted EBITDA reportable segments to net income, which is its most directly comparable financial measure calculated and presented in accordance with GAAP: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Net income $ 8.5 $ 42.5 $ 48.2 $ 92.1 Add: Depreciation and amortization expense 35.5 35.7 107.2 106.7 Interest expense, net 6.6 8.0 21.0 24.3 Income tax expense (benefit) 14.6 (2.9) 29.7 14.3 Transaction costs (1) 0.2 0.4 0.4 1.4 Corporate and Other expenses 9.2 9.1 26.6 27.5 Adjusted EBITDA reportable segments $ 74.6 $ 92.8 $ 233.1 $ 266.3 (1) Costs incurred as part of the granulated pig iron project with U.S. Steel.

General (Policies)

General (Policies)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements included herein have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim reporting. Certain information and disclosures normally included in financial statements have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In management’s opinion, the financial statements reflect all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results of operations, financial position and cash flows for the periods presented. The results of operations for the period ended September 30, 2023 are not necessarily indicative of the operating results expected for the entire year. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2022.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Schedule of Components of Inventories	The components of inventories were as follows: September 30, 2023 December 31, 2022 (Dollars in millions) Coal $ 127.8 $ 109.4 Coke 21.5 14.3 Materials, supplies and other 57.5 51.5 Total inventories $ 206.8 $ 175.2

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both September 30, 2023 and December 31, 2022, and other intangibles detailed in the table below, excluding fully amortized intangible assets. September 30, 2023 December 31, 2022 Weighted - Average Remaining Amortization Years Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net (Dollars in millions) Customer relationships 1 $ 6.7 $ 6.0 $ 0.7 $ 6.7 $ 5.6 $ 1.1 Permits 19 31.7 5.6 26.1 31.7 4.5 27.2 Other 27 1.6 0.2 1.4 1.6 0.1 1.5 Total $ 40.0 $ 11.8 $ 28.2 $ 40.0 $ 10.2 $ 29.8

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Tax Rate	At the end of each interim period, we make our best estimate of the annual effective tax rate and the impact of discrete items, if any, and adjust the rate as necessary. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Income before income tax expense (benefit) $ 23.1 $ 39.6 $ 77.9 $ 106.4 Income tax expense (benefit) 14.6 (2.9) 29.7 14.3 Effective tax rate 63.2 % (7.3) % 38.1 % 13.4 %

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2023
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) Accrued benefits $ 21.6 $ 29.7 Current portion of postretirement benefit obligation 2.4 2.4 Other taxes payable 12.8 9.8 Current portion of black lung liability 5.9 5.9 Accrued legal 0.6 4.9 Accrued losses on purchase commitments (1) 6.0 — Other 5.6 8.1 Total accrued liabilities $ 54.9 $ 60.8 (1) Reflects lower of cost or net realizable value adjustments of $6.0 million on purchase commitments of coal inventory.

Debt and Financing Obligation (

Debt and Financing Obligation (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Total Debt and Financing Obligation	Total debt and financing obligation, including the current portion of the financing obligation, consisted of the following: September 30, 2023 December 31, 2022 (Dollars in millions) 4.875 percent senior notes, due 2029 (“2029 Senior Notes”) $ 500.0 $ 500.0 $350.0 revolving credit facility, due 2026 (“Revolving Facility”) — 35.0 5.346 percent financing obligation, due 2024 6.3 8.8 Total borrowings $ 506.3 $ 543.8 Debt issuance costs (10.2) (11.6) Total debt and financing obligation $ 496.1 $ 532.2 Less: current portion of financing obligation 6.3 3.3 Total long-term debt and financing obligation $ 489.8 $ 528.9

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Benefit Liabilities	The following table summarizes the discount rate utilized, active claims and the total black lung liabilities as of December 31, 2022. Our independent actuarial consultants calculate the present value of the black lung liability annually in the fourth quarter, unless there are changes in facts and circumstances that could materially alter the amount of the liability. Therefore, the discount rate and active claims data utilized to estimate the liability as of December 31, 2022 are not updated as of September 30, 2023. Changes in the black lung liability from December 31, 2022 to September 30, 2023 are a result of actual black lung benefit payments made of $4.1 million and accretion of the black lung liability of $6.0 million during the nine months ended September 30, 2023. The black lung liability at September 30, 2023 was $60.0 million. December 31, 2022 Discount rate (1) 4.9 % Active claims 332 Total black lung liability, discounted (dollars in millions) (2) $ 58.1 Total black lung liability, undiscounted (dollars in millions) $ 88.4 (1) The discount rate is determined based on a portfolio of high-quality corporate bonds with maturities that are consistent with the estimated duration of our black lung obligations. A decrease of 25 basis points in the discount rate would have increased black lung expense by $1.1 million in 2022. (2) The current portion of the black lung liability was $5.9 million at both September 30, 2023 and December 31, 2022, and is included in accrued liabilities on the Consolidated Balance Sheets. The following table reconciles the expected aggregate undiscounted amount to amounts recognized in Consolidated Balance Sheets: December 31, 2022 (Dollars in millions) Black lung liability, undiscounted $ 88.4 Impact of discounting (30.3) Black lung liability, discounted $ 58.1
Schedule of Other Commitments	Expected payments for each of the five succeeding years and the aggregate amount thereafter as of December 31, 2022: (Dollars in millions) 2023 $ 5.9 2024 4.7 2025 5.2 2026 4.7 2027 4.4 2028-Thereafter 63.5 Total $ 88.4

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation, PSUs, Activity	The Company granted the following PSUs: Shares Weighted Average Grant Date Fair Value per Unit PSUs (1)(2) 147,232 $ 9.84 (1) Performance measures for the PSU awards are split 50/50 between the Company's three-year cumulative Adjusted EBITDA (as defined in Note 12 to the consolidated financial statements with the exception of the corporate/other expenses adjustment) and the Company's three-year average pre-tax return on capital for its coke and logistics businesses and unallocated corporate expenses.
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	Below is a summary of the compensation expense, unrecognized compensation costs, and the period for which the unrecognized compensation cost is expected to be recognized over: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 September 30, 2023 Compensation Expense (1) Unrecognized Compensation Cost Weighted Average Remaining Recognition Period (Dollars in millions) (Years) Equity Awards: RSUs $ 0.8 $ 0.6 $ 1.8 $ 1.6 $ 1.4 1.1 PSUs 0.3 1.2 1.8 3.0 0.9 1.7 Total equity awards $ 1.1 $ 1.8 $ 3.6 $ 4.6 Liability Awards: Cash RSUs $ 0.9 $ 0.1 $ 1.9 $ 1.0 $ 2.0 1.7 Cash incentive award 0.6 1.5 2.3 3.9 2.0 1.7 Total liability awards $ 1.5 $ 1.6 $ 4.2 $ 4.9 (1) Compensation expense recognized by the Company is included in selling, general and administrative expenses on the Consolidated Statements of Income.
Schedule of Unrecognized Compensation Cost, Nonvested Awards	Below is a summary of the compensation expense, unrecognized compensation costs, and the period for which the unrecognized compensation cost is expected to be recognized over: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 September 30, 2023 Compensation Expense (1) Unrecognized Compensation Cost Weighted Average Remaining Recognition Period (Dollars in millions) (Years) Equity Awards: RSUs $ 0.8 $ 0.6 $ 1.8 $ 1.6 $ 1.4 1.1 PSUs 0.3 1.2 1.8 3.0 0.9 1.7 Total equity awards $ 1.1 $ 1.8 $ 3.6 $ 4.6 Liability Awards: Cash RSUs $ 0.9 $ 0.1 $ 1.9 $ 1.0 $ 2.0 1.7 Cash incentive award 0.6 1.5 2.3 3.9 2.0 1.7 Total liability awards $ 1.5 $ 1.6 $ 4.2 $ 4.9 (1) Compensation expense recognized by the Company is included in selling, general and administrative expenses on the Consolidated Statements of Income.

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Reconciliation of Weighted-Average Number of Common Shares Used to Compute Basic EPS to Those Used to Compute Diluted EPS	The following table sets forth the reconciliation of the weighted-average number of common shares used to compute basic EPS to those used to compute diluted EPS: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Shares in millions) Weighted-average number of common shares outstanding-basic 84.8 83.9 84.7 83.8 Add: Effect of dilutive share-based compensation awards 0.3 0.8 0.2 0.7 Weighted-average number of shares-diluted 85.1 84.7 84.9 84.5
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table shows equity awards that are excluded from the computation of diluted EPS as the shares would have been anti-dilutive: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Shares in millions) Stock options $ 1.2 $ 1.6 $ 1.3 $ 1.7 Total $ 1.2 $ 1.6 $ 1.3 $ 1.7

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table provides disaggregated sales and other operating revenue by product or service, excluding intersegment revenues: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Cokemaking $ 481.3 $ 468.5 $ 1,418.5 $ 1,319.4 Energy 12.5 17.3 36.5 49.0 Logistics 15.4 20.1 55.6 58.4 Operating and licensing fees 9.1 8.9 25.8 27.9 Other 2.1 2.0 6.2 3.8 Sales and other operating revenue $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5 The following tables provide disaggregated sales and other operating revenue by customer: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Cliffs Steel $ 338.7 $ 302.7 $ 1,000.8 $ 861.4 U.S. Steel 79.2 75.2 230.4 209.8 Other 102.5 138.9 311.4 387.3 Sales and other operating revenue $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Business Segment Information	The following table includes Adjusted EBITDA reportable segments, as defined below, which is a measure of segment profit or loss reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Sales and other operating revenue: Domestic Coke $ 495.7 $ 487.7 $ 1,460.4 $ 1,371.8 Brazil Coke 9.1 8.9 25.8 27.9 Logistics 15.6 20.2 56.4 58.8 Logistics intersegment sales 5.6 7.4 16.9 22.2 Elimination of intersegment sales (5.6) (7.4) (16.9) (22.2) Total sales and other operating revenues $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5 Adjusted EBITDA reportable segments: Domestic Coke $ 64.0 $ 76.6 $ 192.6 $ 216.9 Brazil Coke 2.2 3.3 6.9 11.4 Logistics 8.4 12.9 33.6 38.0 Total Adjusted EBITDA reportable segments $ 74.6 $ 92.8 $ 233.1 $ 266.3 Depreciation and amortization expense: Domestic Coke $ 32.1 $ 31.7 $ 97.1 $ 94.9 Brazil Coke 0.1 — 0.2 0.1 Logistics 3.2 3.7 9.7 10.9 Total reportable segments $ 35.4 $ 35.4 $ 107.0 $ 105.9 Corporate and Other 0.1 0.3 0.2 0.8 Total depreciation and amortization expense $ 35.5 $ 35.7 $ 107.2 $ 106.7 Capital expenditures: Domestic Coke $ 32.6 $ 20.6 $ 80.8 $ 51.8 Brazil Coke — — 0.2 0.1 Logistics 1.4 0.5 3.3 3.2 Total reportable segments $ 34.0 $ 21.1 $ 84.3 $ 55.1 Corporate and Other 0.1 0.6 0.2 0.6 Total capital expenditures $ 34.1 $ 21.7 $ 84.5 $ 55.7 The following table sets forth the Company's segment assets: September 30, 2023 December 31, 2022 (Dollars in millions) Segment assets: Domestic Coke $ 1,443.0 $ 1,422.6 Brazil Coke 10.6 15.7 Logistics (1) 160.7 193.5 Total reportable segments $ 1,614.3 $ 1,631.8 Corporate and Other 64.9 22.8 Total assets $ 1,679.2 $ 1,654.6
Schedule of Reconciliation of Adjusted EBITDA (Unaudited) to Net Income	Below is a reconciliation of Adjusted EBITDA reportable segments to net income, which is its most directly comparable financial measure calculated and presented in accordance with GAAP: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in millions) Net income $ 8.5 $ 42.5 $ 48.2 $ 92.1 Add: Depreciation and amortization expense 35.5 35.7 107.2 106.7 Interest expense, net 6.6 8.0 21.0 24.3 Income tax expense (benefit) 14.6 (2.9) 29.7 14.3 Transaction costs (1) 0.2 0.4 0.4 1.4 Corporate and Other expenses 9.2 9.1 26.6 27.5 Adjusted EBITDA reportable segments $ 74.6 $ 92.8 $ 233.1 $ 266.3 (1) Costs incurred as part of the granulated pig iron project with U.S. Steel.

General (Details)

General (Details) T in Millions	9 Months Ended
	Sep. 30, 2023 facility T
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Coke production experience, more than	60 years
United States
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of facilities | facility	5
Coke making capacity (in tons)	4.2
Brazil
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of facilities | facility	1
Coke making capacity (in tons)	1.7
Convent, Louisiana, East Chicago, Indiana, West Virginia
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Coal handling capacity (in tons)	40
Coal storage capacity (in tons)	3

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Coal	$ 127.8	$ 109.4
Coke	21.5	14.3
Materials, supplies and other	57.5	51.5
Total inventories	$ 206.8	$ 175.2

Intangible Assets - Goodwill Na

Intangible Assets - Goodwill Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Goodwill [Line Items]
Total amortization expense of intangible assets	$ 0.5	$ 0.5	$ 1.6	$ 1.5
Domestic Coke | Operating Segments
Goodwill [Line Items]
Goodwill	$ 3.4		$ 3.4		$ 3.4

Intangible Assets - Gross and N

Intangible Assets - Gross and Net Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 40	$ 40
Accumulated Amortization	11.8	10.2
Net	$ 28.2	29.8
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	1 year
Gross Carrying Amount	$ 6.7	6.7
Accumulated Amortization	6	5.6
Net	$ 0.7	1.1
Permits
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	19 years
Gross Carrying Amount	$ 31.7	31.7
Accumulated Amortization	5.6	4.5
Net	$ 26.1	27.2
Other
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	27 years
Gross Carrying Amount	$ 1.6	1.6
Accumulated Amortization	0.2	0.1
Net	$ 1.4	$ 1.5

Income Taxes - Effective Tax Ra

Income Taxes - Effective Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income before income tax expense (benefit)	$ 23.1	$ 39.6	$ 77.9	$ 106.4
Income tax expense (benefit)	$ 14.6	$ (2.9)	$ 29.7	$ 14.3
Effective tax rate (as a percent)	63.20%	(7.30%)	38.10%	13.40%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Valuation Allowance [Line Items]
Valuation allowance	$ 8.5			$ 8.5
Impact of research and development tax credits	$ 4.6			$ 4.6
Impact of change in tax rates			$ 1
Effective income tax rate before impact of discrete items	26.10%	32.30%		27.20%	29.10%
Foreign Tax Credit Carryforward
Valuation Allowance [Line Items]
Valuation allowance, increase (decrease)	$ 8.5	$ (11.3)		$ 8.5

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued benefits	$ 21.6	$ 29.7
Current portion of postretirement benefit obligation	2.4	2.4
Other taxes payable	12.8	9.8
Current portion of black lung liability	5.9	5.9
Accrued legal	0.6	4.9
Accrued losses on purchase commitments	6	0
Other	5.6	8.1
Total accrued liabilities	$ 54.9	$ 60.8

Debt and Financing Obligation -

Debt and Financing Obligation - Schedule of Total Debt and Financing Obligation (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total borrowings	$ 506,300,000	$ 543,800,000
Debt issuance costs	(10,200,000)	(11,600,000)
Total debt and financing obligation	496,100,000	532,200,000
Less: current portion of financing obligation	6,300,000	3,300,000
Total long-term debt and financing obligation	489,800,000	528,900,000
4.875 percent senior notes, due 2029 (“2029 Senior Notes”) | Senior notes
Debt Instrument [Line Items]
Total borrowings	$ 500,000,000	500,000,000
Interest rate on senior notes (as a percent)	4.875%
$350.0 revolving credit facility, due 2026 (“Revolving Facility”) | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total borrowings	$ 0	35,000,000
Principal amount of term loan	350,000,000
5.346 percent financing obligation, due 2024 | Financing Obligation
Debt Instrument [Line Items]
Total borrowings	$ 6,300,000	$ 8,800,000
Interest rate on senior notes (as a percent)	5.346%

Debt and Financing Obligation_2

Debt and Financing Obligation - Revolving Facility Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding balance	$ 506.3	$ 543.8
Revolving Credit Facility | Line of Credit | SunCoke Revolving Credit Facility, Due 2024
Debt Instrument [Line Items]
Outstanding balance	0
Remaining borrowing capacity	350
Letter of Credit | Line of Credit | SunCoke Revolving Credit Facility, Due 2024
Debt Instrument [Line Items]
Outstanding balance	$ 21.7

Debt and Financing Obligation_3

Debt and Financing Obligation - Covenants Narrative (Details) - Credit Agreement and Partner Revolver - SunCoke Energy Partners, L.P.	Sep. 30, 2023 USD ($)
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	4.50
Minimum consolidated interest coverage ratio	2.50
Cross default covenant threshold	$ 35,000,000

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2013
Loss Contingencies [Line Items]
Threshold for disclosing material environmental legal proceedings	$ 1
Uninsured Risk
Loss Contingencies [Line Items]
Payments	40.4	$ 8.4
Black lung Benefit
Loss Contingencies [Line Items]
Payments	4.1
Accretion	6
Accrual for black lung liability	$ 60

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Schedule of Black Lung Benefit Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) claim	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Current portion of black lung liability	$ 5.9	$ 5.9
Black lung Benefit
Loss Contingencies [Line Items]
Discount rate	4.90%
Active claims | claim	332
Total black lung liability discounted (dollars in millions)	$ 58.1
Total black lung liability, undiscounted (dollars in millions)	88.4
Increase in black lung expense	1.1
Current portion of black lung liability	$ 5.9	$ 5.9

Commitments and Contingent Li_5

Commitments and Contingent Liabilities - Schedule of Expected Payments for Black Lung Benefit Liabilities (Details) - Black lung Benefit $ in Millions	Dec. 31, 2022 USD ($)
Other Commitments [Line Items]
2023	$ 5.9
2024	4.7
2025	5.2
2026	4.7
2027	4.4
2028-Thereafter	63.5
Total	$ 88.4

Commitments and Contingent Li_6

Commitments and Contingent Liabilities - Schedule of Expected Aggregate Undiscounted Amount to Amounts Recognized (Details) - Black lung Benefit $ in Millions	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Black lung liability, undiscounted	$ 88.4
Impact of discounting	(30.3)
Black lung liability, discounted	$ 58.1

Share-Based Compensation -Narra

Share-Based Compensation -Narrative (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) installment $ / shares shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Director
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Compensation expense	$ 0.7	$ 0.4
RSUs
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Share based payment award, grants in period (in shares) | shares	352,646
Fair value grant (in dollars per share) | $ / shares	$ 8.97
Number of annual installment in which stock option exercisable (in installments) | installment	3
Period from grant date for annual installment (in years)	1 year
PSUs | Minimum
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Percent of original award granted	25%
PSUs | Maximum
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Percent of original award granted	200%
Restricted Stock Units Settled in Cash
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Share based payment award, grants in period (in shares) | shares	216,547
Fair value grant (in dollars per share) | $ / shares	$ 9.24
Number of annual installment in which stock option exercisable (in installments) | installment	3
Period from grant date for annual installment (in years)	1 year
Award liability	$ 2.2		$ 2.4
Cash incentive award | Suncoke LTCIP
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Award liability	7.7		$ 8.7
Grant date fair value of award	$ 2.2
Percent of award allocation	50%
Measurement period	3 years

Share-Based Compensation - Perf

Share-Based Compensation - Performance Share Units (Details) - PSUs - Suncoke LTPEP	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares) | shares	147,232
Weighted Average Per Share Grant Date Fair Value (in dollars per share) | $ / shares	$ 9.84
Pre-tax return of capital for Coke and Coal Logistics businesses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of award allocation	50%
Measurement period	3 years
TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
TSR | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement results payout percentage	80%
TSR | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement results payout percentage	120%

Share-Based Compensation - Comp

Share-Based Compensation - Compensation Expense and Unrecognized Compensation Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized Compensation Cost	$ 1.4		$ 1.4
Weighted Average Remaining Recognition Period			1 year 1 month 6 days
RSUs | Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	0.8	$ 0.6	$ 1.8	$ 1.6
PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized Compensation Cost	0.9		$ 0.9
Weighted Average Remaining Recognition Period			1 year 8 months 12 days
PSUs | Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	0.3	1.2	$ 1.8	3
Total equity awards | Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	1.1	1.8	3.6	4.6
Cash RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized Compensation Cost	2		$ 2
Weighted Average Remaining Recognition Period			1 year 8 months 12 days
Cash RSUs | Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	0.9	0.1	$ 1.9	1
Cash incentive award | Suncoke LTCIP
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized Compensation Cost	2		$ 2
Weighted Average Remaining Recognition Period			1 year 8 months 12 days
Cash incentive award | Selling, General and Administrative Expenses | Suncoke LTCIP
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	0.6	1.5	$ 2.3	3.9
Total liability awards | Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense	$ 1.5	$ 1.6	$ 4.2	$ 4.9

Earnings per Share - Computatio

Earnings per Share - Computation of EPS (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Weighted-average number of common shares outstanding-basic (in shares)	84.8	83.9	84.7	83.8
Add: Effect of dilutive share-based compensation awards (in shares)	0.3	0.8	0.2	0.7
Weighted-average number of shares-diluted (in shares)	85.1	84.7	84.9	84.5

Earnings per Share - Antidiluti

Earnings per Share - Antidilutive Securities Excluded From EPS Calculation (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect excluded from the computation of diluted weighted-average shares outstanding (in shares)	1.2	1.6	1.3	1.7
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect excluded from the computation of diluted weighted-average shares outstanding (in shares)	1.2	1.6	1.3	1.7

Fair Value Measurement (Details

Fair Value Measurement (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair value of Company's debt	$ 430	$ 471.9
Outstanding balance	$ 506.3	$ 543.8

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Narrative (Details) T in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) performance_obligation T
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Number of performance obligations in handling and mixing services | performance_obligation	2
Cokemaking
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations capacity (in tons) | T	22.7
Average remaining term	10 years
Logistics
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Average remaining term	3 years
Performance obligation amount | $	$ 28.3

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Disaggregated Sales and Other Operating Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 520.4	$ 516.8	$ 1,542.6	$ 1,458.5
Cliffs Steel
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	338.7	302.7	1,000.8	861.4
U.S. Steel
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	79.2	75.2	230.4	209.8
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	102.5	138.9	311.4	387.3
Cokemaking
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	481.3	468.5	1,418.5	1,319.4
Energy
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	12.5	17.3	36.5	49
Logistics
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	15.4	20.1	55.6	58.4
Operating and licensing fees
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	9.1	8.9	25.8	27.9
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 2.1	$ 2	$ 6.2	$ 3.8

Business Segment Information -

Business Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 segment
Segment Reporting [Abstract]
Number of reportable segments	3

Business Segment Information _2

Business Segment Information - Segment Profit or Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Sales and other operating revenue	$ 520.4	$ 516.8	$ 1,542.6	$ 1,458.5
Adjusted EBITDA	74.6	92.8	233.1	266.3
Depreciation and amortization expense	35.5	35.7	107.2	106.7
Capital expenditures	34.1	21.7	84.5	55.7
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization expense	35.4	35.4	107	105.9
Capital expenditures	34	21.1	84.3	55.1
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Sales and other operating revenue	495.7	487.7	1,460.4	1,371.8
Adjusted EBITDA	64	76.6	192.6	216.9
Depreciation and amortization expense	32.1	31.7	97.1	94.9
Capital expenditures	32.6	20.6	80.8	51.8
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Sales and other operating revenue	9.1	8.9	25.8	27.9
Adjusted EBITDA	2.2	3.3	6.9	11.4
Depreciation and amortization expense	0.1	0	0.2	0.1
Capital expenditures	0	0	0.2	0.1
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenue	15.6	20.2	56.4	58.8
Adjusted EBITDA	8.4	12.9	33.6	38
Depreciation and amortization expense	3.2	3.7	9.7	10.9
Capital expenditures	1.4	0.5	3.3	3.2
Intersegment sales
Segment Reporting Information [Line Items]
Sales and other operating revenue	(5.6)	(7.4)	(16.9)	(22.2)
Intersegment sales | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenue	5.6	7.4	16.9	22.2
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and amortization expense	0.1	0.3	0.2	0.8
Capital expenditures	$ 0.1	$ 0.6	$ 0.2	$ 0.6

Business Segment Information _3

Business Segment Information - Segment Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 1,679.2	$ 1,654.6
Operating Segments
Segment Reporting Information [Line Items]
Total assets	1,614.3	1,631.8
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Total assets	1,443	1,422.6
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Total assets	10.6	15.7
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Total assets	160.7	193.5
Operating Segments | Logistics | Dismal River Terminal ("DRT")
Segment Reporting Information [Line Items]
Total assets		21.7
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 64.9	$ 22.8

Business Segment Information _4

Business Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting [Abstract]
Net income	$ 8.5	$ 42.5	$ 48.2	$ 92.1
Add:
Depreciation and amortization expense	35.5	35.7	107.2	106.7
Interest expense, net	6.6	8	21	24.3
Income tax expense (benefit)	14.6	(2.9)	29.7	14.3
Transaction costs	0.2	0.4	0.4	1.4
Corporate and Other expenses	9.2	9.1	26.6	27.5
Adjusted EBITDA reportable segments	$ 74.6	$ 92.8	$ 233.1	$ 266.3