10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______ to _______.

Commission file number 001-34474

Century Aluminum Company

(Exact name of registrant as specified in its charter)

Delaware	13-3070826
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
One South Wacker Drive	60606
Suite 1000	(Zip Code)
Chicago
Illinois
(Address of principal executive offices)

Registrant’s telephone number, including area code: (312) 696-3101

Securities registered pursuant to Section 12(b) of the Act:

Title of each class:	Trading Symbol(s)	Name of each exchange on which registered:
Common Stock, $0.01 par value per share	CENX	Nasdaq Stock Market LLC
		(Nasdaq Global Select Market)

The registrant had 89,484,834 shares of common stock outstanding at October 29, 2020.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ☒ Yes ☐ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). ☒ Yes ☐ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

☐ Yes ☒ No

TABLE OF CONTENTS
	Page
PART I - FINANCIAL INFORMATION
Item 1. Financial Statements.	4
Condensed Notes to the Consolidated Financial Statements	11
Note 1. General	11
Note 2. Related Party Transactions	11
Note 3. Revenue	12
Note 4. Fair Value Measurements	13
Note 5. Earnings (Loss) per Share	17
Note 6. Shareholders' Equity	18
Note 7. Income Taxes	19
Note 8. Inventories	19
Note 9. Debt	20
Note 10. Commitments and Contingencies	23
Note 11. Components of Accumulated Other Comprehensive Loss	26
Note 12. Components of Net Periodic Benefit Cost	27
Note 13. Derivatives	27
Note 14. Condensed Consolidating Financial Information	29
Note 15. Subsequent Events	39
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.	40
Item 3. Quantitative and Qualitative Disclosures about Market Risk.	47
Item 4. Controls and Procedures.	50
PART II - OTHER INFORMATION
Item 1. Legal Proceedings.	51
Item 1A. Risk Factors.	51
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.	51
Item 5. Other Information.	52
Item 6. Exhibits.	53
SIGNATURES	54

3

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

CENTURY ALUMINUM COMPANY
CONSOLIDATED STATEMENTS OF OPERATIONS
(in millions, except per share amounts)
(Unaudited)
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
NET SALES:
Related parties	$	235.8	$	282.3	$	792.4	$	898.7
Other customers	157.1		155.7		423.6		502.5
Total net sales	392.9		438.0		1,216.0		1,401.2
Cost of goods sold	420.0		451.7		1,251.3		1,431.8
Gross profit (loss)	(27.1)		(13.7)		(35.3)		(30.6)
Selling, general and administrative expenses	11.0		11.6		31.7		38.2
Other operating (income) expense - net	(0.2)		(0.1)		0.3		0.4
Operating income (loss)	(37.9)		(25.2)		(67.3)		(69.2)
Interest expense - Hawesville term loan	(0.4)		(0.8)		(1.6)		(1.3)
Interest expense	(9.1)		(5.6)		(21.0)		(17.3)
Interest income	0.1		0.2		0.6		0.6
Net gain (loss) on forward and derivative contracts	(9.4)		10.3		(1.9)		10.7
Loss on early extinguishment of debt	(1.2)		—		(1.2)		—
Other income (expense) - net	0.0		(0.9)		3.0		(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(57.9)		(22.0)		(89.4)		(78.1)
Income tax benefit (expense)	(0.3)		1.3		1.6		5.7
Income (loss) before equity in earnings of joint ventures	(58.2)		(20.7)		(87.8)		(72.4)
Loss on sale of BHH	—		—		—		(4.3)
Equity in earnings of joint ventures	—		—		0.0		0.7
Net income (loss)	$	(58.2)	$	(20.7)	$	(87.8)	$	(76.0)
Net income (loss) allocated to common stockholders	$	(58.2)	$	(20.7)	$	(87.8)	$	(76.0)
EARNINGS (LOSS) PER COMMON SHARE:
Basic and diluted	$	(0.65)	$	(0.23)	$	(0.98)	$	(0.86)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic and diluted	89.5		88.9		89.4		88.6

See condensed notes to consolidated financial statements

4

CENTURY ALUMINUM COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
(in millions)
(Unaudited)
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Comprehensive income (loss):
Net income (loss)	$	(58.2)	$	(20.7)	$	(87.8)	$	(76.0)
Other comprehensive income before income tax effect:
Net income (loss) on foreign currency cash flow hedges reclassified as income	(0.1)		(0.0)		(0.1)		(0.1)
Defined benefit plans and other postretirement benefits:
Amortization of prior service benefit (cost) during the period	(0.7)		(1.2)		(2.3)		(3.8)
Amortization of net gain (loss) during the period	2.1		2.2		6.5		6.7
Other comprehensive income (loss) before income tax effect	1.3		1.0		4.1		2.8
Income tax effect	(0.2)		(0.3)		(0.8)		(0.8)
Other comprehensive income (loss)	1.1		0.7		3.3		2.0
Total comprehensive income (loss)	$	(57.1)	$	(20.0)	$	(84.5)	$	(74.0)

See condensed notes to consolidated financial statements

5

CENTURY ALUMINUM COMPANY
CONSOLIDATED BALANCE SHEETS
(in millions)
(Unaudited)
	September 30, 2020		December 31, 2019
ASSETS
Cash and cash equivalents	$	81.4	$	38.9
Restricted cash	3.7		0.8
Accounts receivable - net	50.6		70.1
Due from affiliates	15.0		30.1
Inventories	267.5		320.6
Derivative assets	10.6		14.6
Prepaid and other current assets	14.5		12.2
Total current assets	443.3		487.3
Property, plant and equipment - net	899.7		949.2
Due from affiliates - less current portion	1.3		0.5
Other assets	61.1		62.7
TOTAL	$	1,405.4	$	1,499.7
LIABILITIES AND SHAREHOLDERS’ EQUITY
LIABILITIES:
Accounts payable, trade	$	85.6	$	97.1
Due to affiliates	2.9		32.9
Accrued and other current liabilities	69.5		61.5
Accrued employee benefits costs	10.4		10.4
Hawesville term loan	20.0		20.0
U.S. revolving credit facility	5.0		4.0
Industrial revenue bonds	7.8		7.8
Total current liabilities	201.2		233.7
Senior notes payable	242.8		249.2
Hawesville term loan - less current portion	5.0		20.0
Iceland revolving credit facility	45.0		—
Accrued pension benefits costs - less current portion	56.0		60.8
Accrued postretirement benefits costs - less current portion	98.8		100.7
Other liabilities	46.2		42.4
Leases - right of use liabilities	23.4		22.8
Deferred taxes	94.6		95.1
Total noncurrent liabilities	611.8		591.0
COMMITMENTS AND CONTINGENCIES (NOTE 10)	—		—
SHAREHOLDERS’ EQUITY:
Preferred stock (Note 6)	0.0		0.0
Common stock (Note 6)	1.0		1.0
Additional paid-in capital	2,528.4		2,526.5
Treasury stock, at cost	(86.3)		(86.3)
Accumulated other comprehensive loss	(106.5)		(109.8)
Accumulated deficit	(1,744.2)		(1,656.4)
Total shareholders’ equity	592.4		675.0
TOTAL	$	1,405.4	$	1,499.7

See condensed notes to consolidated financial statements

6

CENTURY ALUMINUM COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in millions)
(Unaudited)
	Nine months ended September 30,
	2020		2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$	(87.8)	$	(76.0)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Loss on sale of BHH	—		4.3
Unrealized (gain) loss on derivative instruments	2.3		(10.9)
Lower of cost or NRV inventory adjustment	40.8		15.8
Depreciation and amortization	61.7		63.0
Loss on early extinguishment of debt	1.0		—
Other non-cash items - net	1.5		(5.9)
Change in operating assets and liabilities:
Accounts receivable - net	19.5		10.7
Due from affiliates	14.9		(0.2)
Inventories	12.3		5.7
Prepaid and other current assets	(1.0)		3.8
Accounts payable, trade	(12.0)		(11.3)
Due to affiliates	(29.9)		(10.3)
Accrued and other current liabilities	6.7		8.4
Ravenswood retiree medical settlement	(2.0)		(2.0)
Other - net	5.3		0.5
Net cash provided by (used in) operating activities	33.3		(4.4)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(11.5)		(39.9)
Proceeds from sales of property, plant & equipment	0.1		—
Proceeds from sale of joint venture	—		10.5
Net cash provided by (used in) investing activities	(11.4)		(29.4)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt	(250.0)		—
Proceeds from issuance of debt	243.8		—
Borrowing under Hawesville term loan	—		40.0
Repayments on Hawesville term loan	(15.0)		—
Borrowings under revolving credit facilities	173.6		314.6
Repayments under revolving credit facilities	(127.6)		(337.5)
Debt issuance costs	(1.1)		—
Debt retirement costs	(0.2)		—
Other short-term borrowings	—		3.4
Repayment on other short-term borrowings	—		(3.4)
Issuance of common stock	—		0.3
Net cash provided by (used in) financing activities	23.5		17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	45.4		(16.4)
Cash, cash equivalents and restricted cash, beginning of period	39.7		39.7
Cash, cash equivalents and restricted cash, end of period	$	85.1	$	23.3

7

CENTURY ALUMINUM COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in millions)
(Unaudited)
	Nine months ended September 30,
	2020		2019
Supplemental Cash Flow Information:
Cash paid for:
Interest	$	14.1	$	11.6
Taxes	0.1		0.3
Non-cash investing activities:
Capital expenditures	0.4		3.9

See condensed notes to consolidated financial statements

8

CENTURY ALUMINUM COMPANY
CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY
(in millions)
(Unaudited)
	Preferred stock		Common stock		Additional paid-in capital		Treasury stock, at cost		Accumulated other comprehensive loss		Accumulated deficit		Total shareholders’ equity
Three months ended September 30, 2020
Balance, June 30, 2020	$	0.0	$	1.0	$	2,527.6	$	(86.3)	$	(107.6)	$	(1,686.0)	$	648.7
Net income (loss)	—		—		—		—		—		(58.2)		(58.2)
Other comprehensive income (loss)	—		—		—		—		1.1		—		1.1
Share-based compensation	—		—		0.8		—		—		—		0.8
Conversion of preferred stock to common stock	—		—		—		—		—		—		—
Balance, September 30, 2020	$	0.0	$	1.0	$	2,528.4	$	(86.3)	$	(106.5)	$	(1,744.2)	$	592.4
Three months ended September 30, 2019
Balance, June 30, 2019	$	0.0	$	1.0	$	2,524.3	$	(86.3)	$	(98.7)	$	(1,630.9)	$	709.4
Net income (loss)	—		—		—		—		—		(20.7)		(20.7)
Other comprehensive income (loss)	—		—		—		—		0.7		—		0.7
Share-based compensation	—		—		0.5		—		—		—		0.5
Conversion of preferred stock to common stock	—		—		—		—		—		—		—
Balance, September 30, 2019	$	0.0	$	1.0	$	2,524.8	$	(86.3)	$	(98.0)	$	(1,651.6)	$	689.9
	Preferred stock		Common stock		Additional paid-in capital		Treasury stock, at cost		Accumulated other comprehensive loss		Accumulated deficit		Total shareholders’ equity
Nine months ended September 30, 2020
Balance, December 31, 2019	$	0.0	$	1.0	$	2,526.5	$	(86.3)	$	(109.8)	$	(1,656.4)	$	675.0
Net income (loss)	—		—		—		—		—		(87.8)		(87.8)
Other comprehensive income (loss)	—		—		—		—		3.3		—		3.3
Share-based compensation	—		0.0		1.9		—		—		—		1.9
Conversion of preferred stock to common stock	0.0		0.0		0.0		—		—		—		0.0
Balance, September 30, 2020	$	0.0	$	1.0	$	2,528.4	$	(86.3)	$	(106.5)	$	(1,744.2)	$	592.4
Nine months ended September 30, 2019
Balance, December 31, 2018	$	—	$	1.0	$	2,523.0	$	(86.3)	$	(98.7)	$	(1,576.8)	$	762.2

9

Impact of ASU 2018-02*	—		—		—		—		(1.3)		1.3		—
Net income (loss)	—		—		—		—		—		(76.0)		(76.0)
Other comprehensive income (loss)	—		—		—		—		2.0		—		2.0
Share-based compensation	—		0.0		1.8		—		—		—		1.8
Conversion of preferred stock to common stock	0.0		0.0		(0.0)		—		—		—		0.0
Balance, September 30, 2019	$	0.0	$	1.0	$	2,524.8	$	(86.3)	$	(98.0)	$	(1,651.6)	$	689.9

* ASU 2018-02. See Note 7. Income Taxes for further information regarding our adoption of ASU 2018-02.

10

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements

Three and nine months ended September 30, 2020 and 2019

(amounts in millions, except share and per share amounts)

(Unaudited)

1.General

The accompanying unaudited interim consolidated financial statements of Century Aluminum Company should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2019. In management’s opinion, the unaudited interim consolidated financial statements reflect all adjustments, which are of a normal and recurring nature, that are necessary for a fair presentation of financial results for the interim periods presented. Operating results for the first nine months of 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. Throughout this Form 10-Q, and unless expressly stated otherwise or as the context otherwise requires, "Century Aluminum," "Century," the "Company," "we," "us," "our" and "ours" refer to Century Aluminum Company and its consolidated subsidiaries.

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes." Amendments include the removal of certain exceptions to the general principles of ASC 740 and to improve and simplify accounting for income taxes by clarifying and amending existing guidance. Updates are related to intraperiod tax allocation, interim period tax calculations, tax laws or rate changes in interim periods, and income taxes related to employee stock ownership plans. The ASU is effective for fiscal years beginning after December 15, 2020, including interim periods therein and early adoption is permitted. The Company is currently evaluating the impacts of ASU 2019-12 and we do not expect the adoption to have a material effect on the consolidated financial statements.

In March 2020, the Securities and Exchange Commission (“SEC”) issued a final rule that amends the disclosure requirements related issuers and guarantors of certain registered securities under SEC Regulation S-X Rule 3-10. The final rule allows registrants to provide alternative financial disclosures in either the registrant’s MD&A or financial statements, rather than the previous requirement under Rule 3-10, which required condensed consolidating financial information within the financial statements. It also simplifies the requirements in Rule 3-10 that currently must be met for a parent company to qualify for exceptions allowing it to provide alternative disclosures rather than full audited financial statements. The ruling also reduces the periods for which summarized financial information is required to be presented to the most recent (1) annual period and (2) year-to-date interim period. The final rule applies to annual reports on Form 10-K for fiscal years ending after January 4, 2021 and quarterly reports on Form 10-Q for quarterly periods ending after January 4, 2021 and registrants may voluntarily comply with the final rule before the effective date. The Company does not expect the future adoption, which is limited to disclosures only, to have a material effect on the Company’s consolidated financial statements.

2.Related Party Transactions

The significant related party transactions occurring during the nine months ended September 30, 2020 and 2019 are described below. We believe all of our transactions with related parties are at prices that approximate market.

Glencore ownership

As of September 30, 2020, Glencore plc and its affiliates (together "Glencore") beneficially owned 42.9% of Century’s outstanding common stock (46.8% on a fully-diluted basis assuming the conversion of all of the Series A Convertible Preferred Stock) and all of our outstanding Series A Convertible Preferred Stock. See Note 6. Shareholders' Equity for a description of our outstanding Series A Convertible Preferred Stock. From time to time, Century and Glencore enter into various transactions for the purchase and sale of primary aluminum, purchase and sale of alumina, tolling agreements, certain forward financial contracts and loan agreements.

11

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

Sales to Glencore

For the three months ended September 30, 2020 and 2019, approximately 60.0% and 64.5%, respectively, of our consolidated net sales were made to Glencore, while for the nine months ended September 30, 2020 and 2019, we derived 65.2% and 64.1%, respectively, of our consolidated net sales from sales to Glencore.

Glencore purchases aluminum produced at our U.S smelters at prices based on the London Metal Exchange (the "LME") plus the Midwest regional delivery premium plus any additional market-based product premiums. Glencore purchases aluminum produced at our Grundartangi, Iceland smelter at prices based on the LME plus the European Duty Paid premium plus any additional market-based product premiums.

We have also entered into agreements with Glencore pursuant to which we sell certain amounts of alumina at market-based prices. For the three months and nine months ended September 30, 2020, we recorded $16.4 million and $17.6 million of revenue related to alumina sales to Glencore, respectively. For the three months and nine months ended September 30, 2019, we recorded $4.5 million and $26.2 million of revenue related to alumina sales to Glencore, respectively.

Purchases from Glencore

We purchase a portion of our alumina requirements from Glencore. Alumina purchases from Glencore during the nine months ended September 30, 2020 were priced based on published alumina and aluminum indices.

Financial contracts with Glencore

We have certain financial contracts with Glencore. See Note 13. Derivatives regarding these forward financial sales contracts.

Hawesville Term Loan

On April 29, 2019, we entered into a loan agreement with Glencore Ltd. pursuant to which the Company borrowed $40.0 million (the "Hawesville Term Loan”).  See Note 9. Debt for additional information. Borrowings under the Hawesville Term Loan were used to partially finance the second phase of the Hawesville restart project.

Summary

A summary of the aforementioned significant related party transactions is as follows: 

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Net sales to Glencore	$	235.8	$	282.3	$	792.4	$	898.7
Purchases from Glencore	63.7		43.6		137.3		249.8
Purchases from BHH (1)	—		2.2		—		16.8

(1) We previously owned a 40% interest in Baise Haohai Carbon Co. Ltd. ("BHH") and purchased carbon anodes from them for use in our operations. Purchases represented herein were prior to the divestiture of our interest in BHH in May 2019.

3.Revenue

We disaggregate our revenue by geographical region as follows:

Net Sales	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
United States	$	242.0	$	277.1	$	764.0	$	911.9
Iceland	150.9		160.9		452.0		489.3
Total	$	392.9	$	438.0	$	1,216.0	$	1,401.2

12

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

4.Fair Value Measurements

We measure certain of our assets and liabilities at fair value. Fair value represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.

The fair value hierarchy provides transparency regarding the inputs we use to measure fair value. We categorize each fair value measurement in its entirety into the following three levels, based on the lowest level input that is significant to the entire measurement:

•Level 1 Inputs - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.

•Level 2 Inputs - inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.

•Level 3 Inputs - significant unobservable inputs for the asset or liability.

Recurring Fair Value Measurements	As of September 30, 2020
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	71.2	$	—	$	—	$	71.2
Trust assets (1)	0.2		—		—		0.2
Derivative instruments	—		11.4		6.6		18.0
TOTAL	$	71.4	$	11.4	$	6.6	$	89.4
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		4.9		0.8		5.7
TOTAL	$	—	$	4.9	$	0.8	$	5.7

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

Recurring Fair Value Measurements	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	23.3	$	—	$	—	$	23.3
Trust assets (1)	0.2		—		—		0.2
Surety bonds (2)	1.8		—		—		1.8
Derivative instruments	—		9.1		10.6		19.7
TOTAL	$	25.3	$	9.1	$	10.6	$	45.0
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		1.3		2.9		4.2
TOTAL	$	—	$	1.3	$	2.9	$	4.2

13

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

(2) Surety bonds were invested in U.S. treasury bills and represent collateral against our workers' compensation insurance policy.

We use the following valuation techniques and inputs for fair value measurements categorized within Level 2 of the fair value hierarchy:

Level 2 Fair Value Measurements:
Asset / Liability	Level	Valuation Techniques	Inputs
LME forward financial sales contracts	2	Discounted cash flows	Quoted LME forward market
MWP forward financial sales contracts	2	Discounted cash flows	Quoted MWP forward market
Fixed for floating swaps	2	Discounted cash flows	Quoted LME forward market, quoted MWP forward market
Nord Pool power price swaps	2	Discounted cash flows	Quoted Nord Pool forward market
MISO Indiana Hub power price swaps	2	Discounted cash flows	Quoted Indy Hub forward market
FX swaps	2	Discounted cash flows	Euro/USD forward exchange rate

When valuing Level 3 assets and liabilities, we use certain significant unobservable inputs. Management incorporates various inputs and assumptions including forward commodity prices, commodity price volatility, and macroeconomic conditions, including interest rates and discount rates. Our estimates of significant unobservable inputs are ultimately based on our estimates of risks that market participants would consider when valuing our assets and liabilities.

The following table presents the inputs for fair value measurements categorized within Level 3 of the fair value hierarchy, along with information regarding significant unobservable inputs used to value Level 3 assets and liabilities:

Level 3 Fair Value Measurements:
Asset / Liability	Fair Value at September 30, 2020		Valuation Technique	Observable Inputs	Significant Unobservable Input	Value/Range of Unobservable Input
LME forward financial sales contracts	$	6.6	Discounted cash flows	Quoted LME forward market prices	Discount rate (1)	10.00%
Contingent obligation	$	—	Discounted cash flows	Quoted LME forward market prices	Management's estimates of the LME forward market price beyond the quoted periods (2)	$1,754/T-$2,312/T
Hawesville L4 power price swaps	$	(0.8)	Discounted cash flows	Quoted Indy Hub forward market prices	Estimates of locational margin prices during contract term in megawatt hours (MWh) (3)	$0.45/MWh

(1) Represents risk adjusted discount rate.

(2) Represents the range of estimated forward LME prices of primary aluminum through the term of the agreement in December 2028.

14

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

(3) Represents historical average of locational margin prices from January 2017-September 2020

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis.

	Level 3 Assets		Level 3 Liabilities
For the three months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of July 1, 2020	$	6.1	$	(1.5)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	(4.2)		(0.2)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		0.9
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3	—		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	(4.2)	$	0.7

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

For the three months ended September 30, 2019	Level 3 Assets		Level 3 Liabilities
	U.S. LME forward financial sales contracts		Hawesville L4 Power Price Swaps
Balance as of July 1, 2019	$	6.9	$	(2.7)
Total realized/unrealized gains (losses)
Included in Net Income (1)	8.8		1.2
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		—
Transfers into Level 3	—		—
Transfers out of Level 3	—		—
Balance as of September 30, 2019	$	15.7	$	(1.5)
Change in unrealized gains (losses) (1)	$	8.8	$	1.2

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

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CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

	Level 3 Assets		Level 3 Liabilities
For the nine months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of January 1, 2020	$	10.6	$	(2.9)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	0.8		(1.6)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		3.7
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3 (3)	(9.5)		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	0.8	$	2.1

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

(3) Transfer out of Level 3 due to period of time remaining in derivative contract.

For the nine months ended September 30, 2019	Level 3 Assets				Level 3 Liabilities
	Nord Pool power price swaps		US LME forward financial sales contracts		Hawesville L4 Power Price Swaps		Iceland LME forward financial sales contracts		FX Swaps
Balance as of January 1, 2019	$	4.7	$	0.3	$	—	$	(0.2)	$	(0.3)
Total realized/unrealized gains (losses)
Included in Net Income (1)	(1.0)		15.6		1.2		(0.1)		(0.3)
Purchases, sales, settlements
Purchases	—		—		—		—		—
Sales	—		—		—		—		—
Settlements	—		—		—		—		—
Transfers into Level 3 (2)	—		(0.2)		(2.7)		—		—
Transfers out of Level 3	(3.7)		—		—		0.3		0.6
Balance as of September 30, 2019	$	—	$	15.7	$	(1.5)	$	—	$	—
Change in unrealized gains (losses) (1)	$	(1.0)	$	15.4	$	(1.5)	$	(0.1)	$	(0.3)

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfer into Level 3 resulting from derivative contracts entered into during the first nine months of 2019.

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CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

5. Earnings (Loss) Per Share

Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive securities.

The following table shows the basic and diluted earnings (loss) per share:

	For the three months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(58.2)					$	(20.7)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(58.2)		89.5	$	(0.65)	$	(20.7)		88.9	$	(0.23)

	For the nine months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(87.8)					$	(76.0)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(87.8)		89.4	$	(0.98)	$	(76.0)		88.6	$	(0.86)

	Three months ended September 30,		Nine months ended September 30,
Securities excluded from the calculation of diluted EPS (in millions)(1):	2020	2019	2020	2019
Share-based compensation	1.7	0.7	1.2	0.6

(1) In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their anti-dilutive effect on earnings (loss) per share.

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CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

6.Shareholders’ Equity

Common Stock

As of September 30, 2020 and December 31, 2019, we had 195,000,000 shares of common stock, $0.01 par value per share, authorized under our Restated Certificate of Incorporation, of which 96,671,355 shares were issued and 89,484,834 shares were outstanding at September 30, 2020; 96,372,182 shares were issued and 89,185,661 shares were outstanding at December 31, 2019.

The rights, preferences and privileges of holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of our preferred stock which are currently outstanding, including our Series A Convertible Preferred Stock, or which we may designate and issue in the future.

Preferred Stock

As of September 30, 2020 and December 31, 2019, we had 5,000,000 shares of preferred stock, $0.01 par value per share, authorized under our Restated Certificate of Incorporation. In 2008, we issued 160,000 shares of our Series A Convertible Preferred Stock. Glencore holds all of the issued and outstanding Series A Convertible Preferred Stock. At September 30, 2020 and December 31, 2019, there were 66,039 and 67,323 shares of Series A Convertible Preferred Stock outstanding, respectively.

The issuance of common stock under our stock incentive programs, debt exchange transactions and any stock offering that excludes Glencore participation triggers anti-dilution provisions of the preferred stock agreement and results in the automatic conversion of Series A Convertible Preferred Stock shares into shares of common stock. The conversion ratio of preferred to common shares is 100 shares of common stock for each share of preferred stock.   

The Common and Preferred Stock table below contains additional information about preferred stock conversions during the nine months ended September 30, 2020 and 2019.

	Preferred stock	Common stock
Common and Preferred Stock Activity (in shares):	Series A Convertible	Treasury	Outstanding
Beginning balance as of December 31, 2019	67,323	7,186,521	89,185,661
Conversion of convertible preferred stock	(1,284)	—	128,389
Issuance for share-based compensation plans	—	—	170,784
Ending balance as of September 30, 2020	66,039	7,186,521	89,484,834
Beginning balance as of December 31, 2018	71,967	7,186,521	88,103,440
Conversion of convertible preferred stock	(3,392)	—	339,166
Issuance for share-based compensation plans	—	—	451,161
Ending balance as of September 30, 2019	68,575	7,186,521	88,893,767

Stock Repurchase Program

In 2011, our Board of Directors authorized a $60.0 million common stock repurchase program and during the first quarter of 2015, our Board of Directors increased the size of the program by $70.0 million. Under the program, Century is authorized to repurchase up to $130.0 million of our outstanding shares of common stock, from time to time, on the open market at prevailing market prices, in block trades or otherwise. The timing and amount of any shares repurchased will be determined by our management based on its evaluation of market conditions, the trading price of our common stock and other factors. The stock repurchase program may be suspended or discontinued at any time.

Shares of common stock repurchased are recorded at cost as treasury stock and result in a reduction of shareholders’ equity in the consolidated balance sheets. From time to time, treasury shares may be reissued as contributions to our employee benefit plans and for the conversion of convertible preferred stock. When shares are reissued, we use an average cost method for determining cost. The difference between the cost of the shares and the reissuance price is added to or deducted from additional

18

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

paid-in capital.

We have repurchased 7,186,521 shares of common stock under the program for an aggregate purchase price of $86.3 million. We have made no repurchases since April 2015 and we have $43.7 million remaining under the repurchase program authorization as of September 30, 2020.

7.    Income Taxes

We recorded an income tax expense of $0.3 million and income tax benefit of $1.3 million for the three months ended September 30, 2020 and 2019, respectively. The change is primarily due to improved operational results from foreign operations in the current quarter. For the nine months ended September 30, 2020 and 2019, we recorded an income tax benefit of $1.6 million and $5.7 million, respectively, which is primarily the result of overall losses from our foreign operations.

Our income tax benefit or expense is based on an annual effective tax rate forecast, including estimates and assumptions that could change during the year. The application of the accounting requirements for income taxes in interim periods, after consideration of our valuation allowance, causes a significant variation in the typical relationship between income tax expense/benefit and pre-tax accounting income/loss.

As of September 30, 2020, all of Century's U.S. and certain foreign deferred tax assets, net of deferred tax liabilities, continue to be subject to a valuation allowance.

On January 1, 2019, the Company adopted ASU 2018-02, "Income Statement-Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income," which provides for the reclassification from accumulated other comprehensive income to retained earnings of stranded tax effects resulting from the Tax Cuts and Jobs Act ("the Act"). In accordance with the provisions of ASU 2018-02, $1.3 million of stranded tax effects related to the Act were reclassified from accumulated other comprehensive loss to retained earnings in the first quarter of 2019. This reclassification included the impact of the change in the federal corporate income tax rate and the related federal benefit of state taxes.

The Company’s accounting policy with respect to releasing income tax effects from accumulated other comprehensive income is to apply a security by security approach whereby the tax effects are measured based on the change in the unrealized gains or losses reflected in other comprehensive loss.

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was enacted in response to the coronavirus ("COVID-19") pandemic. The CARES Act is aimed at providing assistance and health care for individuals, families, and businesses affected by COVID-19 and generally supporting the U.S. economy. The CARES Act, among other things, includes provisions related to refundable payroll tax credits, deferment of the employer portion of social security payments, net operating loss carryback periods, modifications to the net interest deduction limitations, and technical corrections to tax depreciation methods for qualified improvement property. We continue to analyze the various aspects of the CARES Act to determine the impact specific provisions may have on us and our operations. As of September 30, 2020, Century does not expect to record material benefits from the CARES Act.

8.    Inventories

Inventories consist of the following:

	September 30, 2020		December 31, 2019
Raw materials	$	75.2	$	101.3
Work-in-process	41.3		44.1
Finished goods	18.4		34.3
Operating and other supplies	132.6		140.9
Total inventories	$	267.5	$	320.6

19

Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out ("FIFO") or the weighted average cost method.

9.Debt

	September 30, 2020		December 31, 2019
Debt classified as current liabilities:
Hawesville Term Loan - current portion(1)	$	20.0	$	20.0
Hancock County industrial revenue bonds ("IRBs") due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (2)	7.8		7.8
U.S. Revolving Credit Facility(3)	5.0		4.0
Debt classified as non-current liabilities:
Iceland Revolving Credit Facility (4)	45.0		—
7.5% senior secured notes due June 2021, net of debt discount of $0.8 million at December 31, 2019	—		249.2
12.0% senior secured notes due June 2025, net of debt discount of $2.4 million and financing fees of $4.8 million at September 30, 2020, interest payable semiannually	242.8		—
Hawesville Term Loan - less current portion(1), principal and interest payable monthly	5.0		20.0
Total	$	325.6	$	301.0

(1) See "Hawesville Term Loan" below. At September 30, 2020, the applicable interest rate was LIBOR of 0.3% plus margin of 5.375% and there is no interest payable outstanding. As of September 30, 2020, we have made $15.0 million of principal payments and $1.6 million of interest payments.

(2) The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at September 30, 2020 was 0.34%.

(3) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 4.0%.

(4) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 3.2%.

12.0% Notes due 2025

General. On July 1, 2020, we issued $250.0 million in aggregate principal amount of 12.0% senior secured notes due 2025 (the "2025 Notes"). The 2025 Notes were issued at a discount and we received proceeds of $243.8 million, prior to payment of certain financing fees and related expenses.

Interest Rate. The 2025 Notes bear interest semi-annually in arrears on January 1 and July 1 of each year, beginning on January 1, 2021, at a rate of (i) 10.00% per annum in cash and (ii) 2.00% per annum in the form of additional notes or in cash, at our option.

Maturity. The 2025 Notes mature on July 1, 2025.

Seniority. The 2025 Notes are senior secured obligations of Century, ranking equally in right of payment with all existing and future senior indebtedness of Century, but effectively senior to unsecured debt to the extent of the value of the collateral.

Guaranty. Our obligations under the 2025 Notes are guaranteed by all of our existing and future domestic restricted subsidiaries (the “Guarantor Subsidiaries”), except for foreign owned holding companies, any domestic restricted subsidiary that owns no assets other than equity interests or other investments in foreign subsidiaries and certain immaterial subsidiaries, which guaranty shall in each case be a senior secured obligation of such Guarantor Subsidiaries, ranking equally in right of payment with all existing and future senior indebtedness of such Guarantor Subsidiaries but effectively senior to unsecured debt to the extent of the value of collateral.

20

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

Collateral. Our obligations under the 2025 Notes and the Guarantor Subsidiaries' obligations under the guarantees are secured by a pledge of and lien on (subject to certain exceptions):

(i) all of our and the Guarantor Subsidiaries' property, plant and equipment (other than certain excluded property);

(ii) all equity interests in subsidiaries directly owned by Century or any Guarantor Subsidiaries; and

(iii) proceeds of the foregoing.

Under certain circumstances, the indenture and the security documents governing the 2025 Notes will permit us and the guarantors to incur additional debt that also may be secured by liens on the collateral that are equal to or have priority over the liens securing the 2025 Notes. The collateral agent for the 2025 Notes will agree with the collateral agent for the other debt holders and us under such circumstances to enter into an intercreditor agreement that will cause the liens securing the 2025 Notes to be contractually subordinated to the liens securing such additional debt.

Redemption Rights. Prior to July 1, 2021, we may redeem the 2025 Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and if redeemed during the twelve-month period beginning on July 1 of the years indicated below, at the following redemption prices plus accrued and unpaid interest:

Year	Percentage
2021	105.0%
2022	102.5%
2023	101.25%
2024	100.0%

Upon a change of control (as defined in the indenture governing the 2025 Notes), we will be required to make an offer to purchase the 2025 Notes at a purchase price equal to 101% of the outstanding principal amount of the 2025 Notes on the date of the purchase, plus accrued and unpaid interest to the date of purchase.

Covenants. The indenture governing the 2025 Notes contains customary covenants which may limit our ability, and the ability of certain of our subsidiaries, to: (i) incur additional debt; (ii) incur additional liens; (iii) pay dividends or make distributions in respect of capital stock; (iv) purchase or redeem capital stock; (v) make investments or certain other restricted payments; (vi) sell assets; (vii) issue or sell stock of certain subsidiaries; (viii) enter into transactions with shareholders or affiliates; and (ix) effect a consolidation or merger.

7.5% Notes Tender Offer and Redemption

In June 2020, we commenced a tender offer to the holders of the outstanding 7.5% senior secured notes due June 2021 (the "2021 Notes") and notified all such holders of our election to redeem all 2021 Notes not purchased in the tender offer on July 31, 2020. We received tenders for approximately $243.7 million in aggregate principal amount of the 2021 Notes and the remaining 2021 Notes were redeemed on July 31, 2020 at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest. As a result, the Company’s and the guarantors’ obligations under the indenture governing the 2021 Notes have been fully discharged. We applied the net proceeds from the offering of the 2025 Notes described above, together with cash on hand, toward payment of the total consideration amount to holders whose 2021 Notes were accepted and purchased in the tender offer and to fund the redemption of any remaining 2021 Notes.

Based on the characteristics of the 2021 Notes and the 2025 Notes that were issued, the tender and redemption of the 2021 Notes are accounted for as an extinguishment of the debt. Accordingly, we have recorded a $1.2 million loss on early extinguishment of debt, consisting of the write-off of deferred financing costs and the debt discount associated with the 2021 Notes, as well as the tender fees paid as part of the tender offer.

Hawesville Term Loan

On April 29, 2019, we entered into a loan agreement with Glencore Ltd. pursuant to which the Company borrowed $40.0 million. Borrowings under the Hawesville Term Loan were used to partially finance the second phase of the Hawesville restart project. The Hawesville Term Loan matures on December 31, 2021 and is to be repaid in twenty-four (24) equal monthly

21

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

installments of principal, beginning on January 31, 2020.  The Hawesville Term Loan bears interest, due monthly, at a floating rate equal to LIBOR plus 5.375% per annum. The Hawesville Term Loan is not secured by any collateral. 

U.S. Revolving Credit Facility

We and certain of our direct and indirect domestic subsidiaries ("the Borrowers") have a senior secured revolving credit facility with a syndicate of lenders (as amended from time to time, the "U.S. revolving credit facility"). The U.S. revolving credit facility provides for borrowings of up to $175.0 million in the aggregate, including up to $110.0 million under a letter of credit sub-facility, and also includes an uncommitted accordion feature whereby borrowers may increase the capacity of the U.S. revolving credit facility by up to $50.0 million, subject to agreement with the lenders. The U.S. revolving credit facility matures on May 16, 2023.

Any letters of credit issued and outstanding under the U.S. revolving credit facility reduce our borrowing availability on a dollar-for-dollar basis. At September 30, 2020, there were $5.0 million in outstanding borrowings under our U.S. revolving credit facility. Principal payments, if any, are due upon maturity of the U.S. revolving credit facility and may be prepaid without penalty.

Status of our U.S. revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	175.0
Borrowing availability	124.6
Outstanding letters of credit issued	36.6
Outstanding borrowings	5.0
Borrowing availability, net of outstanding letters of credit and borrowings	83.0

Iceland Revolving Credit Facility

Our wholly-owned subsidiary, Nordural Grundartangi ehf ("Grundartangi"), has entered into a $50.0 million revolving credit facility agreement with Landsbankinn hf., dated November 2013, as amended (the "Iceland revolving credit facility"). At September 30, 2020, there were $45.0 million in outstanding borrowings under our Iceland revolving credit facility. The Iceland revolving credit facility has a term through November 2022. Principal payments, if any, are due upon maturity of the Iceland revolving credit facility and may be prepaid without penalty.

Status of our Iceland revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	50.0
Borrowing availability	50.0
Outstanding letters of credit issued	—
Outstanding borrowings	45.0
Borrowing availability, net of borrowings	5.0

22

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

10.Commitments and Contingencies

We have pending against us or may be subject to various lawsuits, claims and proceedings related primarily to employment, commercial, stockholder, environmental, safety and health matters and are involved in other matters that may give rise to contingent liabilities. While the results of such matters and claims cannot be predicted with certainty, we believe that the ultimate outcome of any such matters and claims will not have a material adverse impact on our financial condition, results of operations or liquidity. However, because of the nature and inherent uncertainties of litigation and estimating liabilities, should the resolution or outcome of these actions be unfavorable, our business, financial condition, results of operations and liquidity could be materially and adversely affected.

In evaluating whether to accrue for losses associated with legal or environmental contingencies, it is our policy to take into consideration factors such as the facts and circumstances asserted, our historical experience with contingencies of a similar nature, the likelihood of our prevailing and the severity of any potential loss.  For some matters, no accrual is established because we have assessed our risk of loss to be remote.  Where the risk of loss is probable and the amount of the loss can be reasonably estimated, we record an accrual, either on an individual basis or with respect to a group of matters involving similar claims, based on the factors set forth above. While we regularly review the status of, and our estimates of potential liability associated with, contingencies to determine the adequacy of any associated accruals and related disclosures, the ultimate amount of loss may differ from our estimates.

Legal Contingencies

Vernon

In July 2006, we were named as a defendant, together with certain affiliates of Alcan Inc., in a lawsuit brought by Alcoa Inc. seeking to determine responsibility for certain environmental indemnity obligations related to the sale of a cast aluminum plate manufacturing facility located in Vernon, California, which we purchased from Alcoa Inc. in December 1998, and sold to Alcan Rolled Products-Ravenswood LLC in July 1999. The complaint also seeks costs and attorney fees. The matter was stayed by the court in 2008 to allow for the remediation of environmental areas at the site. On June 30, 2016, the U.S. District Court for the District of Delaware ordered the stay lifted and reopened the case. Discovery was completed in the third quarter of 2019. Trial was bifurcated and moved from March 2020 to February 2021 for Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA") issues and to a later undetermined date in 2021 for questions of fact. At this stage, we cannot predict the ultimate outcome of this action or estimate a range of reasonably possible losses related to this matter.

Ravenswood Retiree Medical Benefits

In November 2009, Century Aluminum of West Virginia ("CAWV") filed a class action complaint for declaratory judgment against the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union ("USW"), the USW’s local and certain CAWV retirees, individually and as class representatives ("CAWV Retirees"), seeking a declaration of CAWV’s rights to modify/terminate retiree medical benefits. Later in November 2009, the USW and representatives of a retiree class filed a separate suit against CAWV, Century Aluminum Company, Century Aluminum Master Welfare Benefit Plan, and various John Does with respect to the foregoing. 

On August 18, 2017, the District Court for the Southern District of West Virginia approved a settlement agreement in respect of these actions. Under the terms of the settlement agreement, CAWV agreed to make payments into a trust for the benefit of the CAWV Retirees in the aggregate amount of $23.0 million over the course of ten years. Upon approval of the settlement, we paid $5.0 million to the aforementioned trust in September 2017 and recognized a gain of $5.5 million to arrive at the-then net present value of $12.5 million. CAWV has agreed to pay the remaining amounts under the settlement agreement in annual increments of $2.0 million for nine years. As of September 30, 2020, $2.0 million was recorded in other current liabilities and $7.3 million was recorded in other liabilities.

23

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

PBGC Settlement

In 2013, we entered into a settlement agreement with the Pension Benefit Guarantee Corporation ("PBGC") regarding an alleged "cessation of operations" at our Ravenswood facility. Pursuant to the terms of the agreement, we agreed to make additional contributions (above any minimum required contributions) to our defined benefit pension plans totaling approximately $17.4 million. Under certain circumstances, in periods of lower primary aluminum prices relative to our cost of operations, we are able to defer one or more of these payments, provided that we provide the PBGC with acceptable security for such deferred payments. We did not make any contributions for the nine month periods ended September 30, 2020, and 2019. We have elected to defer certain payments under the PBGC agreement and have provided the PBGC with the appropriate security. The remaining contributions under this agreement are approximately $9.6 million.

Environmental Contingencies

Matters relating to the St. Croix Alumina Refining Facility

We are a party to a United States Environmental Protection Agency Administrative Order on Consent (the "Order") pursuant to which certain past and present owners of an alumina refining facility at St. Croix, Virgin Islands (the "St. Croix Alumina Refinery") have agreed to carry out a Hydrocarbon Recovery Plan to remove and manage hydrocarbons floating on groundwater underlying the facility.  Pursuant to the Hydrocarbon Recovery Plan, recovered hydrocarbons and groundwater are delivered to the adjacent petroleum refinery where they are received and managed. At this time, we are not able to estimate the amount of any future potential payments under this indemnification to comply with the Order, but we do not anticipate that any such amounts will have a material adverse effect on our financial condition, results of operations or liquidity, regardless of the final outcome.

In December 2010, Century was among several defendants named in a lawsuit filed by plaintiffs who either worked, resided or owned property in the area downwind from the St. Croix Alumina Refinery. In March 2011, Century was also named a defendant in a nearly identical suit brought by certain additional plaintiffs. The plaintiffs in both suits allege damages caused by the presence of red mud and other particulates coming from the alumina facility and are seeking unspecified monetary damages, costs and attorney fees as well as certain injunctive relief. We tendered indemnity and defense to St. Croix Alumina LLC and Alcoa Alumina & Chemical LLC under the terms of an acquisition agreement relating to the facility and have filed motions to dismiss plaintiffs’ claims. In August 2015, the Superior Court of the Virgin Islands, Division of St. Croix denied the motions to dismiss but ordered all plaintiffs to refile individual complaints. On February 28, 2018, plaintiffs in both cases filed a Motion for Voluntary Dismissal of Century without prejudice to refiling. At this time, it is not possible to predict the ultimate outcome of or to estimate a range of reasonably possible losses for any of the foregoing actions relating to the St. Croix Alumina Refinery.

Power Commitments and Contingencies

Hawesville

Hawesville has a power supply arrangement with Kenergy and EDF Trading North America, LLC (“EDF") which provides market-based power to the Hawesville smelter. Under this arrangement, the power companies purchase power on the open market and pass it through to Hawesville at Midcontinent Independent System Operator ("MISO") pricing plus transmission and other costs. The power supply arrangement with Kenergy has an effective term through December 2023. The arrangement with EDF to act as our market participant with MISO has an effective term through May 2022. Each of these agreements provide for automatic extension on a year-to-year basis unless a one year notice is given.

Sebree

Sebree has a power supply arrangement with Kenergy and EDF which provides market-based power to the Sebree smelter. Similar to the arrangement at Hawesville, the power companies purchase power on the open market and pass it through to Sebree at MISO pricing plus transmission and other costs. The power supply arrangement with Kenergy has an effective term through December 2023. The arrangement with EDF to act as our market participant with MISO has an effective term through May 2022. Each of these agreements provides for automatic extension on a year-to-year basis unless a one year notice is given.

24

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

Mt. Holly

Mt. Holly has a power supply arrangement pursuant to which 25% of the Mt. Holly load is served from the South Carolina Public Service Authority’s ("Santee Cooper") generation at a cost-based industrial rate and 75% of the Mt. Holly load is sourced from a supplier that is outside Santee Cooper’s service territory at market prices that are tied to natural gas prices. The agreement with Santee Cooper has a term through December 31, 2020. The agreement with the other power supplier has a term through December 31, 2020 and may be terminated by Mt. Holly on 60 days’ notice.

On October 20, 2020, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2020, when our current power contracts at Mt. Holly expire, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the federal Worker Adjustment and Retraining Notification Act.

Grundartangi

Grundartangi has power purchase agreements for approximately 525 MW with HS Orka hf ("HS"), Landsvirkjun and Orkuveita Reykjavikur ("OR") to provide power to its Grundartangi smelter. These power purchase agreements expire on various dates from 2023 through 2036 (subject to extension). The power purchase agreements with HS and OR both provide power at LME-based variable rates for the duration of these agreements. The power purchase agreement with Landsvirkjun for 161 MW provides power at rates linked to the Nord Pool power market.

Helguvik

Nordural Helguvik ehf ("Helguvik") has a power purchase agreement with OR to provide a portion of the power requirements to the Helguvik project. The agreement would provide power at LME-based variable rates and contain take-or-pay obligations with respect to a significant percentage of the total committed and available power under such agreement. The first phase of power under the OR purchase agreement (approximately 47.5 MW) became available in the fourth quarter of 2011 and is currently being utilized at Grundartangi. The agreement contains certain conditions to OR’s obligations with respect to the remaining phases and OR has alleged that certain of these conditions have not been satisfied.

Other Commitments and Contingencies

Labor Commitments

The bargaining unit employees at our Grundartangi, Vlissingen, Hawesville and Sebree facilities are represented by labor unions, representing approximately 66% of our total workforce. 

Approximately 86% of Grundartangi’s work force is represented by five labor unions, governed by a labor agreement that establishes wages and work rules for covered employees. This agreement is effective through December 31, 2024.

100% of Vlissingen's work force is represented by the Federation for the Metal and Electrical Industry ("FME") by a labor agreement that is effective through December 1, 2020.

Approximately 57% of our U.S. based work force is represented by USW. The labor agreement for Hawesville employees is effective through April 1, 2021. Century Sebree's labor agreement with the USW for its employees is effective through October 28, 2023. Mt. Holly employees are not represented by a labor union.

25

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

11.Components of Accumulated Other Comprehensive Loss

Components of AOCL:	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	(111.7)	$	(115.9)
Unrealized gain (loss) on financial instruments	2.2		2.3
Other comprehensive loss before income tax effect	(109.5)		(113.6)
Income tax effect (1)	3.0		3.8
Accumulated other comprehensive loss	$	(106.5)	$	(109.8)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:

	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	3.4	$	4.3
Unrealized loss on financial instruments	(0.4)		(0.4)

The following table summarizes the changes in the accumulated balances for each component of AOCL:

	Defined benefit plan and other postretirement liabilities		Unrealized gain (loss) on financial instruments		Total, net of tax
Balance, July 1, 2020	$	(109.5)	$	1.9	$	(107.6)
Net amount reclassified to net income (loss)	1.2		(0.1)		1.1
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, July 1, 2019	$	(100.7)	$	2.0	$	(98.7)
Net amount reclassified to net income	0.7		0.0		0.7
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)
Balance, December 31, 2019	$	(111.7)	$	1.9	$	(109.8)
Net amount reclassified to net loss	3.4		(0.1)		3.3
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, December 31, 2018	$	(100.7)	$	2.0	$	(98.7)
Impact of ASU 2018-02 (1)	(1.3)		—		(1.3)
Net amount reclassified to net income (loss)	2.1		(0.1)		2.0
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)

(1) ASU 2018-02. See Note 7. Income Taxes for further information regarding our adoption of ASU 2018-02.

26

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

Reclassifications out of AOCL were included in the consolidated statements of operations as follows:

		Three months ended September 30,				Nine months ended September 30,
AOCL Components	Location	2020		2019		2020		2019
Defined benefit plan and other postretirement liabilities	Cost of goods sold	$	0.8	$	0.8	$	2.3	$	1.7
	Selling, general and administrative expenses	0.1		(0.3)		0.5		(0.9)
	Other operating expense, net	0.5		0.5		1.4		2.1
	Income tax effect	(0.2)		(0.3)		(0.8)		(0.8)
	Net of tax	$	1.2	$	0.7	$	3.4	$	2.1
Unrealized loss on financial instruments	Cost of goods sold	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)
	Income tax effect	0.0		0.0		0.0		0.0
	Net of tax	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)

12. Components of Net Periodic Benefit Cost

	Pension Benefits
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	1.3	$	1.0	$	3.7	$	2.5
Interest cost	2.9		3.3		8.5		10.0
Expected return on plan assets	(5.3)		(4.5)		(15.6)		(13.7)
Amortization of prior service costs	0.1		0.0		0.1		0.6
Amortization of net loss	1.6		1.6		4.9		4.9
Net periodic benefit cost	$	0.6	$	1.4	$	1.6	$	4.3

	Other Postretirement Benefits ("OPEB")
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	0.0	$	0.0	$	0.2	$	0.8
Interest cost	0.8		1.1		2.3		3.4
Amortization of prior service cost	(0.8)		(1.2)		(2.4)		(4.3)
Amortization of net loss	0.5		0.6		1.6		1.7
Net periodic benefit cost	$	0.5	$	0.5	$	1.7	$	1.6

13. Derivatives

As of September 30, 2020, we had an open position of 124,378 tonnes related to LME forward financial sales contracts to fix the forward LME aluminum price. These contracts are expected to settle monthly through December 2024. We also had an open position of 126,000 tonnes related to Midwest Premium ("MWP") forward financial sales contracts to fix the forward MWP price. These contracts are expected to settle through December 2021. We have also entered into LME and MWP financial

27

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions, except share and per share amounts)

(Unaudited)

contracts with various counterparties to offset fixed price sales arrangements with certain of our customers (“fixed for floating swaps”) to remain exposed to the LME and MWP aluminum prices. As of September 30, 2020, we had an open position related to such arrangements of 13,144 tonnes that will settle at various dates through October 2021.

We have entered into financial contracts to fix the forward price for power related to the expected production of Line 4 at Hawesville for the period of January 2020 through December 2020 ("Hawesville L4 power price swaps"). As of September 30, 2020, we had an open position of 198,810 MWh. The Hawesville L4 power price swaps are expected to settle monthly through December 2020.

We have entered into financial contracts to hedge a portion of Grundartangi's exposure to the Nord Pool power market (“Nord Pool power price swaps”). As of September 30, 2020, we had an open position of 1,373,790 MWh related to the Nord Pool power price swaps. The Nord Pool power price swaps are expected to settle monthly through December 2021. Because the Nord Pool power price swaps are settled in Euros, we have entered into financial contracts to hedge the risk of fluctuations associated with the Euro ("FX swaps"). As of September 30, 2020, we had an open position related to the FX swaps of €34.6 million that will settle monthly through December 2021.

The following table sets forth the Company's derivative assets and liabilities that were accounted for at fair value and not designated as cash flow hedges as of September 30, 2020 and December 31, 2019, respectively:

	Asset Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	17.0	$	19.7
Foreign exchange contracts (2)	1.0		—
Total	$	18.0	$	19.7

	Liability Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	5.7	$	3.6
Foreign exchange contracts (2)	—		0.6
Total	$	5.7	$	4.2

(1) Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, Hawesville L4 power price swaps, fixed for floating swaps, and Nord Pool power price swaps. At September 30, 2020 and December 31, 2019, $0.1 million and $0.2 million of Due from affiliates and $1.3 million and $0.5 million of Due from affiliates - less current portion, respectively, is related to commodity contract assets with Glencore.

(2) Foreign exchange contracts reflect our outstanding FX swaps.

The following table summarizes the net (loss) gain on forward and derivative contracts:

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Commodity contracts(3)	$	(11.0)	$	10.6	$	0.8	$	11.2
Foreign exchange contracts	1.6		(0.3)		(2.7)		(0.5)
Total	$	(9.4)	$	10.3	$	(1.9)	$	10.7

(3) For the three months ended September 30, 2020 and 2019, $(4.6) million and $1.9 million of the net (loss) gain, respectively, was with Glencore. For the nine months ended September 30, 2020 and 2019, $0.1 million and $2.7 million of net (loss) gain, respectively, was with Glencore.

28

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

14.Condensed Consolidating Financial Information

The Company has filed a Registration Statement on Form S-3 (the "Universal Shelf Registration Statement") with the Securities and Exchange Commission pursuant to which the Company may, from time to time, offer an indeterminate amount of securities, which may include securities that are guaranteed by certain of the Company's subsidiaries. The condensed consolidated financial information below is presented herein pursuant to the Universal Shelf Registration Statement. We have not issued any debt securities pursuant to the Universal Shelf Registration Statement.

"Guarantor Subsidiaries" refers to all of our material domestic subsidiaries except for Nordural US LLC, Century Aluminum Development LLC and Century Aluminum of West Virginia, Inc.  The Guarantor Subsidiaries are 100% owned by Century.  All guarantees will be full and unconditional; all guarantees will be joint and several.  Our foreign subsidiaries, together with Nordural US LLC, Century Aluminum Development LLC and Century Aluminum of West Virginia, Inc., are collectively referred to as the “Non-Guarantor Subsidiaries”.  We allocate corporate expenses or income to our subsidiaries and charge interest on certain intercompany balances.

The following summarized condensed consolidating statements of comprehensive income (loss) for the three and nine months ended September 30, 2020 and 2019, condensed consolidating balance sheets as of September 30, 2020 and December 31, 2019 and the condensed consolidating statements of cash flows for the nine months ended September 30, 2020 and 2019 present separate results for Century, the Guarantor Subsidiaries, the Non-Guarantor Subsidiaries, consolidating adjustments and total consolidated amounts. 

29

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	116.4	$	119.4	$	—	$	235.8
Other customers	—		125.7		31.4		—		157.1
Total net sales	—		242.1		150.8		—		392.9
Cost of goods sold	—		273.3		146.7		—		420.0
Gross profit (loss)	—		(31.2)		4.1		—		(27.1)
Selling, general and administrative expenses	10.6		—		0.4		—		11.0
Other operating (income) expense - net	—		—		(0.2)		—		(0.2)
Operating income (loss)	(10.6)		(31.2)		3.9		—		(37.9)
Interest expense - Hawesville term loan	(0.4)		—		—		—		(0.4)
Interest expense	(8.3)		(0.4)		(0.4)		—		(9.1)
Intercompany interest	8.1		2.8		(10.9)		—		—
Interest income	—		—		0.1		—		0.1
Net gain (loss) on forward and derivative contracts	(10.0)		0.4		0.2		—		(9.4)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	(0.1)		0.2		(0.1)		—		0.0
Income (loss) before income taxes and equity in earnings of joint ventures	(22.5)		(28.2)		(7.2)		—		(57.9)
Income tax benefit (expense)	0.0		—		(0.3)		—		(0.3)
Income (loss) before equity in earnings of joint ventures	(22.5)		(28.2)		(7.5)		—		(58.2)
Equity in earnings (loss) of joint ventures	(35.7)		0.8		—		34.9		—
Net income (loss)	(58.2)		(27.4)		(7.5)		34.9		(58.2)
Other comprehensive income before income tax effect	1.3		0.8		0.4		(1.2)		1.3
Income tax effect	(0.2)		—		—		—		(0.2)
Other comprehensive income	1.1		0.8		0.4		(1.2)		1.1
Total comprehensive income (loss)	$	(57.1)	$	(26.6)	$	(7.1)	$	33.7	$	(57.1)

30

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	132.9	$	149.4	$	—	$	282.3
Other customers	—		144.2		11.5		—		155.7
Total net sales	—		277.1		160.9		—		438.0
Cost of goods sold	—		288.3		163.4		—		451.7
Gross profit (loss)	—		(11.2)		(2.5)		—		(13.7)
Selling, general and administrative expenses	11.3		—		0.3		—		11.6
Other operating (income) expense - net	—		—		(0.1)		—		(0.1)
Operating income (loss)	(11.3)		(11.2)		(2.7)		—		(25.2)
Interest expense - Hawesville term loan	(0.8)		—		—		—		(0.8)
Interest expense	(5.1)		(0.4)		(0.1)		—		(5.6)
Intercompany interest	8.8		2.6		(11.4)		—		—
Interest income	0.1		—		0.1		—		0.2
Net gain (loss) on forward and derivative contracts	10.2		0.3		(0.2)		—		10.3
Other income (expense) - net	0.1		(0.1)		(0.9)		—		(0.9)
Income (loss) before income taxes and equity in earnings of joint ventures	2.0		(8.8)		(15.2)		—		(22.0)
Income tax (expense) benefit	0.7		—		0.6		—		1.3
Income (loss) before equity in earnings of joint ventures	2.7		(8.8)		(14.6)		—		(20.7)
Equity in earnings (loss) of joint ventures	(23.4)		3.4		(0.1)		20.1		—
Net income (loss)	(20.7)		(5.4)		(14.7)		20.1		(20.7)
Other comprehensive income (loss) before income tax effect	1.0		0.8		0.5		(1.3)		1.0
Income tax effect	(0.3)		—		—		—		(0.3)
Other comprehensive income	0.7		0.8		0.5		(1.3)		0.7
Total comprehensive income (loss)	$	(20.0)	$	(4.6)	$	(14.2)	$	18.8	$	(20.0)

31

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	420.5	$	371.9	$	—	$	792.4
Other customers	—		343.5		80.1		—		423.6
Total net sales	—		764.0		452.0		—		1,216.0
Cost of goods sold	—		820.6		430.7		—		1,251.3
Gross profit (loss)	—		(56.6)		21.3		—		(35.3)
Selling, general and administrative expenses	30.5		—		1.2		—		31.7
Other operating (income) expense - net	—		—		0.3		—		0.3
Operating income (loss)	(30.5)		(56.6)		19.8		—		(67.3)
Interest expense - Hawesville term loan	(1.6)		—		—		—		(1.6)
Interest expense	(18.8)		(1.2)		(1.0)		—		(21.0)
Intercompany interest	24.6		8.2		(32.8)		—		—
Interest income	0.3		—		0.3		—		0.6
Net gain (loss) on forward and derivative contracts	20.7		1.1		(23.7)		—		(1.9)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	—		0.9		2.1		—		3.0
Income (loss) before income taxes and equity in earnings of joint ventures	(6.5)		(47.6)		(35.3)		—		(89.4)
Income tax benefit (expense)	1.0		—		0.6		—		1.6
Income (loss) before equity in earnings of joint ventures	(5.5)		(47.6)		(34.7)		—		(87.8)
Equity in earnings (loss) of joint ventures	(82.3)		3.1		—		79.2		0.0
Net income (loss)	(87.8)		(44.5)		(34.7)		79.2		(87.8)
Other comprehensive income before income tax effect	4.1		2.3		1.3		(3.6)		4.1
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	3.3		2.3		1.3		(3.6)		3.3
Total comprehensive income (loss)	$	(84.5)	$	(42.2)	$	(33.4)	$	75.6	$	(84.5)

32

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	432.8	$	465.9	$	—	$	898.7
Other customers	—		479.1		23.4		—		502.5
Total net sales	—		911.9		489.3		—		1,401.2
Cost of goods sold	—		921.5		510.3		—		1,431.8
Gross profit (loss)	—		(9.6)		(21.0)		—		(30.6)
Selling, general and administrative expenses	36.9		—		1.3		—		38.2
Other operating (income) expense - net	—		—		0.4		—		0.4
Operating income (loss)	(36.9)		(9.6)		(22.7)		—		(69.2)
Interest expense - Hawesville term loan	(1.3)		—		—		—		(1.3)
Interest expense	(15.9)		(1.2)		(0.2)		—		(17.3)
Intercompany interest	26.2		7.6		(33.8)		—		—
Interest income	0.2		—		0.4		—		0.6
Net gain (loss) on forward and derivative contracts	10.3		1.0		(0.6)		—		10.7
Other income (expense) - net	0.9		(2.0)		(0.5)		—		(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(16.5)		(4.2)		(57.4)		—		(78.1)
Income tax benefit (expense)	1.6		—		4.1		—		5.7
Income (loss) before equity in earnings of joint ventures	(14.9)		(4.2)		(53.3)		—		(72.4)
Loss on sale of BHH	—		—		(4.3)		—		(4.3)
Equity in earnings (loss) of joint ventures	(61.1)		3.1		0.7		58.0		0.7
Net income (loss)	(76.0)		(1.1)		(56.9)		58.0		(76.0)
Other comprehensive income before income tax effect	2.8		1.6		2.0		(3.6)		2.8
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	2.0		1.6		2.0		(3.6)		2.0
Total comprehensive income (loss)	$	(74.0)	$	0.5	$	(54.9)	$	54.4	$	(74.0)

33

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Balance Sheets
As of September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	3.1	$	0.2	$	78.1	$	—	$	81.4
Restricted cash	—		1.8		1.9		—		3.7
Accounts receivable - net	1.7		46.8		2.1		—		50.6
Due from affiliates	—		4.5		10.5		—		15.0
Inventories	—		178.3		89.2		—		267.5
Derivative Assets	9.8		—		0.8		—		10.6
Prepaid and other current assets	4.1		1.9		8.5		—		14.5
Total current assets	18.7		233.5		191.1		—		443.3
Property, plant and equipment - net	14.8		319.8		565.1		—		899.7
Investment in subsidiaries	533.8		65.9		—		(599.7)		—
Due from affiliates - less current portion	768.7		584.5		3.4		(1,355.3)		1.3
Other assets	38.0		4.2		18.9		—		61.1
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4
Accounts payable, trade	$	3.2	$	59.4	$	23.0	$	—	$	85.6
Due to affiliates	1.6		1.3		—		—		2.9
Accrued and other current liabilities	23.8		22.3		23.4		—		69.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan - current	20.0		—		—		—		20.0
U.S revolving credit facility	5.0		—		—		—		5.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	55.5		98.5		47.2		—		201.2
Senior notes payable	242.8		—		—		—		242.8
Hawesville term loan - less current portion	5.0		—		—		—		5.0
Iceland revolving credit facility	—		—		45.0		—		45.0
Accrued pension benefits costs - less current portion	23.9		25.4		6.7		—		56.0
Accrued postretirement benefits costs - less current portion	1.0		96.0		1.8		—		98.8
Due to affiliates - long term	439.8		352.1		563.4		(1,355.3)		—
Other liabilities	7.5		24.4		14.3		—		46.2
Leases - right of use liabilities	6.1		0.0		17.3		—		23.4
Deferred taxes	—		0.4		94.2		—		94.6
Total noncurrent liabilities	726.1		498.3		742.7		(1,355.3)		611.8
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		—		—		—		1.0
Other shareholders' equity	591.4		611.1		(11.4)		(599.7)		591.4
Total shareholders' equity	592.4		611.1		(11.4)		(599.7)		592.4
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4

34

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Balance Sheets
As of December 31, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	0.3	$	0.1	$	38.5	$	—	$	38.9
Restricted cash	—		0.8		—		—		0.8
Accounts receivable - net	0.7		64.1		5.3		—		70.1
Due from affiliates	—		10.9		19.2		—		30.1
Inventories	—		205.5		115.1		—		320.6
Derivative Assets	12.2		—		2.4		—		14.6
Prepaid and other current assets	3.0		2.8		6.4		—		12.2
Total current assets	16.2		284.2		186.9		—		487.3
Property, plant and equipment - net	17.2		334.8		597.2		—		949.2
Investment in subsidiaries	609.5		62.7		—		(672.2)		—
Due from affiliates - long term	749.5		537.9		5.1		(1,292.0)		0.5
Other assets	38.1		5.7		18.9		—		62.7
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7
Accounts payable, trade	$	2.3	$	66.2	$	28.6	$	—	$	97.1
Due to affiliates	—		2.2		30.7		—		32.9
Accrued and other current liabilities	23.5		27.3		14.7		—		65.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan	20.0		—		—		—		20.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	47.7		111.2		74.8		—		233.7
Senior notes payable	249.2		—		—		—		249.2
Hawesville term loan - less current portion	20.0		—		—		—		20.0
Accrued pension benefits costs - less current portion	25.1		27.3		8.4		—		60.8
Accrued postretirement benefits costs - less current portion	1.1		97.8		1.8		—		100.7
Leases - right of use liabilities	5.5		0.4		16.9		—		22.8
Other liabilities	3.5		22.2		16.7		—		42.4
Due to affiliates - long term	403.4		315.9		572.7		(1,292.0)		—
Deferred taxes	—		0.4		94.7		—		95.1
Total noncurrent liabilities	707.8		464.0		711.2		(1,292.0)		591.0
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		0.0		0.1		(0.1)		1.0
Other shareholders' equity	674.0		650.1		22.0		(672.1)		674.0
Total shareholders' equity	675.0		650.1		22.1		(672.2)		675.0
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7

35

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(26.1)	$	21.3	$	38.1	$	—	$	33.3
Purchase of property, plant and equipment	(0.8)		(9.3)		(1.4)		—		(11.5)
Proceeds from sale of property, plant, and equipment	—		—		0.1		—		0.1
Intercompany transactions	14.9		(38.3)		1.8		21.6		—
Net cash provided by (used in) investing activities	14.1		(47.6)		0.5		21.6		(11.4)
Repayment of debt	(250.0)		—		—		—		(250.0)
Proceeds from issuance of debt	243.8		—		—		—		243.8
Repayments on Hawesville term loan	(15.0)		—		—		—		(15.0)
Borrowings under revolving credit facilities	128.6		—		45.0		—		173.6
Repayments under revolving credit facilities	(127.6)		—		—		—		(127.6)
Debt issuance costs	(1.1)		—		—		—		(1.1)
Debt retirement costs	(0.2)		—		—		—		(0.2)
Intercompany transactions	36.3		27.4		(42.1)		(21.6)		—
Net cash provided by (used in) financing activities	14.8		27.4		2.9		(21.6)		23.5
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2.8		1.1		41.5		—		45.4
Cash, cash equivalents and restricted cash, beginning of period	0.3		0.9		38.5		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	3.1	$	2.0	$	80.0	$	—	$	85.1

36

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(57.1)	$	45.0	$	7.7	$	—	$	(4.4)
Purchase of property, plant and equipment	(0.6)		(26.4)		(12.9)		—		(39.9)
Proceeds from sale of joint venture	—		—		10.5		—		10.5
Intercompany transactions	(9.3)		(52.6)		2.0		59.9		—
Net cash provided by (used in) investing activities	(9.9)		(79.0)		(0.4)		59.9		(29.4)
Borrowing under Hawesville term loan	40.0		—		—		—		40.0
Borrowings under revolving credit facilities	295.1		—		19.5		—		314.6
Repayments under revolving credit facilities	(318.0)		—		(19.5)		—		(337.5)
Other short term borrowings	3.4		—		—		—		3.4
Repayment on other short term borrowings	(3.4)		—		—		—		(3.4)
Issuance of common stock	0.3		—		—		—		0.3
Intercompany transactions	51.0		34.0		(25.1)		(59.9)		—
Net cash provided by (used in) financing activities	68.4		34.0		(25.1)		(59.9)		17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	1.4		—		(17.8)		—		(16.4)
Cash, cash equivalents and restricted cash, beginning of period	0.1		0.8		38.8		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	1.5	$	0.8	$	21.0	$	—	$	23.3

37

CENTURY ALUMINUM COMPANY

Condensed Notes to the Consolidated Financial Statements (continued)

(amounts in millions)

(Unaudited)

15. Subsequent Events

A new five-year labor agreement for our Grundartangi aluminum smelter was ratified by the employees on October 22, 2020. The agreement is retroactive to January 1, 2020 and continues through December 31, 2024.

On October 20, 2020, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2020 when our current power contracts at Mt. Holly expire, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the Worker Adjustment and Retraining Notification Act.

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FORWARD-LOOKING STATEMENTS

This quarterly report includes "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, which are subject to the "safe harbor" created by section 27A of the Securities Act of 1933, as amended, and section 21E of the Securities Exchange Act of 1934 (the "Exchange Act"), as amended. Forward-looking statements are statements about future events and are based on our current expectations. These forward-looking statements may be identified by the words “believe,” “expect,” “hope,” “target,” “anticipate,” “intend,” “plan,” “seek,” “estimate,” “potential,” “project,” “scheduled,” “forecast” or words of similar meaning, or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” or “may.”

Forward-looking statements in this quarterly report and in our other reports filed with the Securities and Exchange Commission (the "SEC"), for example, may include statements regarding:

•Our assessment of global and local financial and economic conditions;

•Our assessment of the aluminum market and aluminum prices (including premiums);

•Our assessment of alumina pricing and costs associated with our other key raw materials, including power;

•The impact of the continuously evolving COVID-19 pandemic, including any possible impact on our business, operations, financial condition, results of operation, global supply chains or workforce;

•The future financial and operating performance of the Company and its subsidiaries;

•Our ability to successfully manage market risk and to control or reduce costs;

•Our plans and expectations with respect to future operations, including any plans and expectations to curtail or restart production;

•Our plans with regards to future operations and potential curtailment of our Mt. Holly smelter, including our expectations as to the cost and impact of any curtailment and any future impairment or restructuring charges associated therewith;

•Our plans and ability to bring our Hawesville smelter back to full production and expectations as to the costs and benefits associated with this project, including expected incremental production or earnings and cash flow as well as benefits from investments in new technology and other production improvements;

•Our ability to successfully obtain long-term competitive power arrangements for our operations;

•The impact of Section 232 relief, including tariffs or other trade remedies, the extent to which any such remedies may be changed, including through exclusions or exemptions, and the duration of any trade remedy;

•The impact of any new or changed law, regulation, including, without limitation, sanctions or other similar remedies or restrictions;

•Our anticipated tax liabilities, benefits or refunds including the realization of U.S. and certain foreign deferred tax assets and liabilities;

•Our ability to access existing or future financing arrangements and the terms of any such future financing arrangements;

•Our ability to repay or refinance debt in the future;

•Our ability to recover losses from our insurance;

•Estimates of our pension and other postretirement liabilities, legal and environmental liabilities and other contingent liabilities;

•Our assessment of any future tax audits or insurance claims and their respective outcomes;

•Negotiations with labor unions;

•Our assessment of any information technology-related risks, including the risk from cyberattack or data security breaches; and

•Our future business objectives, plans, strategies and initiatives, including our competitive position and prospects.

Where we express an expectation or belief as to future events or results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, our forward-looking statements are based on current expectations and assumptions that are subject to risks and uncertainties which may cause actual results to differ materially from future results expressed, projected or implied by those forward-looking statements. Important factors that could cause actual results and events to differ from those described in such forward-looking statements can be found in the risk factors and forward-looking statements cautionary language contained in our Annual Report on Form 10-K, quarterly reports on Form 10-Q and in other filings made with the SEC. Although we have attempted to identify those material factors that could cause actual results or events to differ from those described in such forward-looking statements, there may be other factors that could cause actual results or events to differ from those anticipated, estimated or intended. Many of these factors are beyond our ability to control or predict. Given these uncertainties, the reader is cautioned not to place undue reliance on our forward-looking statements. We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events, or otherwise.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

This Management’s Discussion and Analysis (“MD&A”) provides information that management believes is relevant to an assessment and understanding of the consolidated financial condition and results of operations of Century Aluminum Company and should be read in conjunction with the accompanying consolidated financial statements and related notes thereto. This MD&A contains “forward-looking statements” - see “Forward-Looking Statements” above.

Overview

We are a global producer of primary aluminum with aluminum reduction facilities, or "smelters," in the United States and Iceland. The key determinants of our results of operations and cash flow from operations are as follows:

•the price of primary aluminum, which is based on the London Metal Exchange ("LME") and other exchanges, plus any regional premiums and value-added product premiums;

•the cost of goods sold, the principal components of which are electrical power, alumina, carbon products and labor, which in aggregate represent more than 75% of our cost of goods sold; and

•our production volume.

Recent Developments

On October 20, 2020, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2020, when our current power contracts at Mt. Holly expire, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the federal Worker Adjustment and Retraining Notification Act. If a decision is made to curtail the Mt. Holly facility, we would be subject to various costs and it could cause us to write down the book value of the Mt. Holly facility.

COVID-19 Update

In response to the COVID-19 pandemic, we have taken a number of actions to protect the health and well-being of our employees and to prevent the spread of COVID-19 within our operations. As a result, our plants have not experienced any disruption in operations as a result of the pandemic, and we continue to sell all of our metal essentially as it is cast.

The impact of the COVID-19 pandemic on the broader economy, however, resulted in decreased prices for our product. For example, the LME price for primary aluminum averaged $1,494 per tonne for the three months ended June 30, 2020 and $1,592 per tonne for the six months ended June 30, 2020, as compared to an average of $1,792 for 2019. We have recently continued to see some improvement in the global economy resulting in an increase in the price for our product. For example, the LME price for primary aluminum averaged $1,706 for the three months ended September 30, 2020 and $1,803 per tonne for October 2020. However, because we sell our product on a one- to three-month lag to current prices, our results reflect the LME price on this one to three month lag basis. Customer demand for value-added aluminum products and, in turn, the product premium we receive for such products, also have generally returned to first quarter levels after having been negatively impacted by the COVID-19 pandemic. We have taken actions to mitigate the financial impact of the COVID-19 pandemic, including reducing discretionary spending, optimizing working capital and deferring non-essential capital projects. Decreases in the prices of our products have also been partially offset by decreases in the prices of our key cost inputs.

The potential future impact of the COVID-19 pandemic on our business, results of operations and financial performance is difficult to predict and will depend on future developments, and such effects could exist for an extended period of time. See Item 1A. Risk Factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 and Part II, Item 1A. Risk Factors of our quarterly reports on Form 10-Q for additional information on the potential risks associated with the COVID-19 pandemic.

Results of Operations

The following discussion for the three and nine months ended September 30, 2020 reflects restart activity at Hawesville and no change in production capacities at our other operating facilities.

Our net sales are impacted primarily by the LME price for aluminum, regional and value-added premiums, and the volume and product mix of aluminum we ship during the period. In general, our results reflect the LME and regional premium pricing on an approximately one to three month lag basis reflecting contractual terms with our customers.

Electrical power, alumina, carbon products and labor are the principal components of our cost of goods sold. In general, our results reflect the market cost of alumina on an approximately three-month lag reflecting the terms of our alumina contracts and inventory levels.

40

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
	(in millions, except per share data)
NET SALES:
Related parties	$	235.8	$	282.3	$	792.4	$	898.7
Other customers	157.1		155.7		423.6		502.5
Total net sales	392.9		438.0		1,216.0		1,401.2
Gross profit (loss)	(27.1)		(13.7)		(35.3)		(30.6)
Net income (loss)	(58.2)		(20.7)		(87.8)		(76.0)
EARNINGS (LOSS) PER COMMON SHARE:
Basic and Diluted	$	(0.65)	$	(0.23)	$	(0.98)	$	(0.86)

SHIPMENTS - PRIMARY ALUMINUM(1)
	United States			Iceland			Total
	Tonnes	Net Sales (in millions)		Tonnes	Net Sales (in millions)		Tonnes	Net Sales (in millions)
2020
3rd Quarter	118,835	$	221.8	84,187	$	138.4	203,022	$	360.2
2nd Quarter	130,645	$	246.6	79,664	$	145.9	210,309	$	392.5
1st Quarter	129,114	$	273.8	73,791	$	141.0	202,905	$	414.8
Total	378,594	$	742.2	237,642	$	425.3	616,236	$	1,167.5
2019
3rd Quarter	119,916	$	272.0	78,627	$	152.1	198,543	$	424.1
2nd Quarter	125,154	$	295.0	78,226	$	157.7	203,380	$	452.7
1st Quarter	130,043	$	313.3	76,408	$	159.3	206,451	$	472.6
Total	375,113	880.3		233,261	469.1		608,374	1,349.4

    (1) Excludes scrap aluminum and alumina sales.

Net sales (in millions)	2020		2019
Three months ended September 30,	$	392.9	$	438.0
Nine months ended September 30,	$	1,216.0	$	1,401.2

Net sales (excluding alumina sales) decreased by $63.9 million for the three months ended September 30, 2020, compared to the same period in 2019, primarily driven by unfavorable LME and regional premium price realizations of $65.1 million.

Net sales decreased by $185.2 million for the nine months ended September 30, 2020 compared to the same period in 2019, primarily driven by unfavorable LME and regional premium price realizations of $175.4 million.

Gross profit (loss) (in millions)	2020		2019
Three months ended September 30,	$	(27.1)	$	(13.7)
Nine months ended September 30,	$	(35.3)	$	(30.6)

Gross loss increased by $13.4 million for the three months ended September 30, 2020 compared to the same period in 2019 primarily due to unfavorable LME and regional premium price realizations of $65.1 million and unfavorable operating expenses of $8.9 million, partially offset by favorable raw material price realizations of $64.4 million.

41

Gross loss for the nine months ended September 30, 2020 increased by $4.7 million compared to the same period in 2019 primarily due to unfavorable LME and regional premium price realizations of $175.4 million and unfavorable operating expenses of $20.6 million, partially offset by favorable raw material and power price realizations of $192.7 million.

Selling, general and administrative expenses (in millions)	2020		2019
Three months ended September 30,	$	11.0	$	11.6
Nine months ended September 30,	$	31.7	$	38.2

Selling, general and administrative expenses decreased by $0.6 million for the three months ended September 30, 2020 compared to the same period in 2019 primarily driven by a decrease in compensation costs.

Selling, general and administrative expenses for the nine months ended September 30, 2020 decreased by $6.5 million compared to the same period in 2019 primarily driven by a decrease in compensation costs.

Net gain (loss) on forward and derivative contracts (in millions)	2020		2019
Three months ended September 30,	$	(9.4)	$	10.3
Nine months ended September 30,	$	(1.9)	$	10.7

For the three months ended September 30, 2020, net gain on forward and derivative contracts decreased by $19.7 million compared to that for the three months ended September 30, 2019. The period to period change is primarily due to increases in LME and MWP prices from June 30, 2020 to September 30, 2020, as compared to those from June 30, 2019 to September 30, 2019.

For the nine months ended September 30, 2020, net gain on our forward and derivative contracts decreased by $12.6 million compared to that for the nine months ended September 30, 2019. The decrease in gain relates to the impact of increases in LME and MWP prices.

Income tax benefit (expense) (in millions)	2020		2019
Three months ended September 30,	$	(0.3)	$	1.3
Nine months ended September 30,	$	1.6	$	5.7

We have a valuation allowance against all of our U.S. and certain foreign deferred tax assets. The period to period change is primarily due to the change in earnings at our foreign entities that are not subject to a valuation allowance. See Note 7. Income Taxes to the consolidated financial statements included herein for additional information.

Liquidity and Capital Resources

Liquidity

Our principal sources of liquidity are available cash and cash flow from operations. We also have access to our existing revolving credit facilities and have raised capital in the past through public equity and debt markets. We regularly explore various other financing alternatives. Our principal uses of cash include the funding of operating costs (including post-retirement benefits), debt service requirements, capital expenditures, investments in our growth activities and in related businesses, working capital and other general corporate requirements.

We believe that cash provided from operations and financing activities will be adequate to cover our operations and business needs over the next 12 months. As of September 30, 2020, we had cash and cash equivalents of approximately $81.4 million and unused availability under our revolving credit facilities of $88.0 million, resulting in a total liquidity position of approximately $169.4 million.

42

Adverse changes in the price of aluminum or our principal costs of production could materially impact our ability to generate and raise cash. Furthermore, the COVID-19 pandemic could continue to impact the economy which may impact the price of our products as well as our ability to access capital and/or the terms under which we can do so. As noted above, we have taken preemptive action to preserve our liquidity and manage our cash flow. Such actions include reducing discretionary spending, optimizing working capital and deferring non-essential capital projects. To preserve liquidity in light of the uncertainty in the global markets due to COVID-19, in March 2020, we drew down a total of $90.0 million under our U.S. and Iceland revolving credit facilities. In the third quarter, we repaid $40.0 million on our U.S. revolving credit facility. As of September 30, 2020, the remaining outstanding borrowings on the U.S. and Iceland revolving credit facilities were $50.0 million. We also effectively extended the maturities of our principal debt obligations. On July 1, 2020, we issued $250.0 million in aggregate principal amount of our 2025 Notes and used the proceeds, together with cash on hand, to purchase all 2021 Notes tendered in a tender offer and to redeem all 2021 Notes that were not tendered. In connection with the offering of the 2025 Notes, we also entered into Amendment No.1 to our U.S. revolving credit facility extending the maturity date to May 16, 2023. As the impact of the COVID-19 pandemic on the economy and our operations is fluid and constantly evolving, we will continue to assess a variety of measures to improve our financial performance and liquidity. See Item 1A. Risk Factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 and Part II, Item 1A. Risk Factors of our quarterly report on Form 10-Q for the three months ended March 31, 2020 for additional information.

Available Cash

Our available cash and cash equivalents balance at September 30, 2020 was $81.4 million compared to $38.9 million at December 31, 2019.

Sources and Uses of Cash

Our statements of cash flows are summarized below:

	Nine months ended September 30,
	2020		2019
	(in millions)
Net cash provided by (used in) operating activities	$	33.3	$	(4.4)
Net cash provided by (used in) investing activities	(11.4)		(29.4)
Net cash provided by (used in) financing activities	23.5		17.4
Change in cash, cash equivalents and restricted cash	$	45.4	$	(16.4)

The increase in net cash provided by operating activities was primarily driven by improvements in working capital. The improvements in working capital were primarily attributable to lower raw material prices, timing of raw material receipts and the timing of trade receivable collection.

The decrease in net cash used in investing activities was primarily due to higher spending on capital projects during the nine months ended September 30, 2019, driven by a higher level of capital investments in the Hawesville restart project during that period, as compared to the nine months ended September 30, 2020.

The increase in net cash provided by financing activities was primarily due to outstanding borrowings on our U.S. revolving credit facility and Iceland revolving credit facility at September 30, 2020 compared to September 30, 2019, partially offset by payments on our Hawesville Term Loan. Borrowings on our revolving credit facilities are available, if needed, for working capital requirements, general corporate or other purposes.

Availability Under Our Credit Facilities

The U.S. revolving credit facility, dated May 2018, provides for borrowings of up to $175.0 million in the aggregate including up to $110.0 million under a letter of credit sub-facility, and also includes an uncommitted accordion feature whereby borrowers may increase the capacity of the U.S. revolving credit facility by up to $50.0 million, subject to agreement with the lenders. The U.S. revolving credit facility matures on May 16, 2023.

Any letters of credit issued and outstanding under the U.S. revolving credit facility reduce our borrowing availability on a dollar-for-dollar basis.

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We have also entered into, through our wholly-owned subsidiary Nordural Grundartangi ehf ("Grundartangi"), a $50.0 million revolving credit facility, dated November 2013, as amended. The Iceland revolving credit facility matures in November 2022.

The availability of funds under our credit facilities is limited by a specified borrowing base consisting of certain accounts receivable, inventory and qualified cash deposits which meet the lenders' eligibility criteria. Increases in the price of aluminum and/or restarts of previously curtailed operations, for example, increase our borrowing base by increasing our accounts receivable and inventory balances; decreases in the price of aluminum and/or curtailment of production capacity would decrease our borrowing base by reducing our accounts receivable and inventory balances. As of September 30, 2020, our U.S. revolving credit facility had a borrowing base of $124.6 million, $5.0 million in borrowings and $36.6 million in letters of credit outstanding. Of the outstanding letters of credit, $15.7 million related to our domestic power commitments and the remainder secured certain debt and workers’ compensation commitments. As of September 30, 2020, our Iceland revolving credit facility had a borrowing base of $50.0 million and $45.0 million in borrowings.

As of September 30, 2020, our credit facilities had $88.0 million of net availability after consideration of our outstanding borrowings and letters of credit. We may borrow and make repayments under our credit facilities in the ordinary course based on a number of factors, including the timing of payments from our customers and payments to our suppliers.

Our credit facilities contain customary covenants, including restrictions on mergers and acquisitions, indebtedness, affiliate transactions, liens, dividends and distributions, dispositions of collateral, investments and prepayments of indebtedness, including, a springing financial covenant that requires us to maintain a fixed charge coverage ratio of at least 1.0 to 1.0 any time availability under the U.S. revolving credit facility is less than or equal to the lower of $17.5 million or 10% of the borrowing base but not less than $12.5 million. We intend to maintain availability to comply with these levels any time we would not meet the ratio, which could limit our ability to access the full amount of our availability under our U.S revolving credit facility. Our Iceland revolving credit facility also contains a covenant that requires Grundartangi to maintain a minimum equity ratio. As of September 30, 2020, we were in compliance with all such covenants or maintained availability above such covenant triggers.

Senior Secured Notes

We have $250.0 million aggregate principal of senior secured notes that will mature in June 2025 (the "2025 Notes"), unless earlier refinanced in accordance with their terms. Interest on the 2025 Notes is payable semi-annually on January 1 and July 1 of each year, beginning on January 1, 2021, at a rate of (i) 10.00% per annum in cash and (ii) 2.00% per annum in the form of additional notes or in cash, at Century's option. The indenture governing the 2025 Notes contains customary covenants which may limit our ability, and the ability of certain of our subsidiaries, to: (i) incur additional debt; (ii) incur additional liens; (iii) pay dividends or make distributions in respect of capital stock; (iv) purchase or redeem capital stock; (v) make investments or certain other restricted payments; (vi) sell assets; (vii) issue or sell stock of certain subsidiaries; (viii) enter into transactions with shareholders or affiliates; and (ix) effect a consolidation or merger.

We applied the net proceeds from the offering of the 2025 Notes described above, together with cash on hand, toward payment of the total consideration amount to holders whose 2021 Notes were accepted and purchased in the tender offer and to fund the redemption of any remaining 2021 Notes. As a result, the Company's and the guarantors' obligations under the indenture governing the 2021 Notes have been fully discharged.

Hawesville Term Loan

On April 29, 2019, we entered into a term loan agreement with Glencore Ltd. pursuant to which the Company borrowed $40.0 million (the "Hawesville Term Loan"). Borrowings under the Hawesville Term Loan were used to partially finance the second phase of the Hawesville restart project. The Hawesville Term Loan matures on December 31, 2021, and is to be repaid in twenty-four (24) equal monthly installments of principal that began on January 31, 2020. The Hawesville Term Loan bears interest, due monthly, at a floating rate equal to LIBOR plus 5.375% per annum. The Hawesville Term Loan is not secured by any collateral.

Contingent Commitments

We have a contingent obligation in connection with the "unwind" of a contractual arrangement between Century Aluminum of Kentucky ("CAKY"), Big Rivers and a third party and the execution of a long-term cost-based power contract with Kenergy, a member of a cooperative of Big Rivers in July 2009. This contingent obligation consists of the aggregate payments made to Big Rivers by the third party on CAKY’s behalf in excess of the agreed upon base amount under the long-term cost-based power contract with Kenergy.  As of September 30, 2020, the principal and accrued interest for the contingent obligation was $26.3 million, which was fully offset by a derivative asset. We may be required to make installment payments for the contingent obligation in the future. These payments are contingent based on the LME price of primary aluminum and

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the level of Hawesville’s operations. Based on the LME forward market at September 30, 2020 and management’s estimate of the LME forward market beyond the quoted market period, we believe that we will not be required to make payments on the contingent obligation during the term of the agreement, which expires in 2028. There can be no assurance that circumstances will not change, thus accelerating the timing of such payments.

Employee Benefit Plan Contributions

In 2013, we entered into a settlement agreement with the Pension Benefit Guarantee Corporation ("PBGC") regarding an alleged "cessation of operations" at our Ravenswood facility. Pursuant to the terms of the agreement, we will make additional contributions (above any minimum required contributions) to our defined benefit pension plans totaling approximately $17.4 million. Under certain circumstances, in periods of lower primary aluminum prices relative to our cost of operations, we are able to defer one or more of these payments, but would then be required to provide the PBGC with acceptable security for deferred payments. We did not make any contributions in the three month periods ended September 30, 2020 and 2019. We have elected to defer certain payments under the PBGC agreement and have provided the PBGC with the appropriate security. The remaining contributions under this agreement are approximately $9.6 million.

Section 232 Aluminum Tariff

On March 23, 2018, the U.S. implemented a 10% tariff on imported primary aluminum products into the U.S. These tariffs are intended to protect U.S. national security by incentivizing the restart of primary aluminum production in the U.S., reducing reliance on imports and ensuring that domestic producers, like Century, can supply all the aluminum necessary for critical industries and national defense.  In addition to primary aluminum products, the tariffs also cover certain other semi-finished products. All imports that directly compete with our products are covered by the tariff, with the exception of imports from Australia, Argentina, Canada and Mexico or imports that receive a product exclusion from the Department of Commerce.

Other Items

In March 2018, we announced our intention to return our Hawesville smelter, which since 2015 had been operating at approximately 40% capacity, to full production and upgrade its existing reduction technology. The first phase of the project, which involved the restart of the three potlines and approximately 150,000 tonnes of production capacity that had been curtailed in 2015, was successfully completed on budget and ahead of schedule in early 2019. The second phase of the project involves the rebuilding of the pots associated with the 100,000 tonnes of production from the two potlines that had continued to operate past their expected life cycle and the implementation of certain new technology across all production. These two potlines were taken out of production in February and September 2019, respectively. The rebuild of the first of these potlines was completed in the second quarter of 2020. With the restart of this potline, the Hawesville smelter is currently operating at approximately 80% production capacity with total project costs to date of approximately $107.4 million. The rebuild of the fifth and final potline and the completion of the technology upgrades is expected to be completed over the next several years subject to market conditions.

In May 2018, we temporarily curtailed one potline at our Sebree aluminum smelter due to an equipment failure. Sebree was returned to full capacity by the end of the third quarter of 2018.  We expect that all losses arising from the Sebree equipment failure will be covered under our insurance policies, less $7.0 million in deductibles. As of September 30, 2020, we have received $19.1 million in insurance proceeds to offset against such losses.

In November 2009, Century Aluminum of West Virginia ("CAWV") filed a class action complaint for declaratory judgment against the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union ("USW"), the USW’s local and certain CAWV retirees, individually and as class representatives ("CAWV Retirees"), seeking a declaration of CAWV’s rights to modify/terminate retiree medical benefits.  Later in November 2009, the USW and representatives of a retiree class filed a separate suit against CAWV, Century Aluminum Company, Century Aluminum Master Welfare Benefit Plan, and various John Does with respect to the foregoing. On August 18, 2017, the District Court for the Southern District of West Virginia approved a settlement agreement in respect of these actions. Under the terms of the settlement agreement, CAWV agreed to make payments into a trust for the benefit of the CAWV Retirees in the aggregate amount of $23.0 million over the course of ten years. Upon approval of the settlement, we paid $5.0 million to the aforementioned trust in September 2017 and agreed to pay the remaining amounts under the settlement agreement in annual increments of $2.0 million for nine years. At September 30, 2020, we had $2.0 million in other current liabilities and $7.3 million in other liabilities related to this agreement.

We are a defendant in several actions relating to various aspects of our business. While it is impossible to predict the ultimate disposition of any litigation, we do not believe that any of these lawsuits, either individually or in the aggregate, will have a material adverse effect on our financial condition, results of operations or liquidity. See Note 10. Commitments and Contingencies to the consolidated financial statements included herein for additional information.

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Capital Resources

We intend to finance our future capital expenditures from available cash, cash flow from operations and if necessary, borrowing under our existing revolving credit facilities. For major investment projects we would likely seek financing from various capital and loan markets, and may potentially pursue the formation of strategic alliances. We may be unable, however, to issue additional debt or equity securities, or enter into other financing arrangements on attractive terms, or at all, due to a number of factors including a lack of demand, unfavorable pricing, poor economic conditions, unfavorable interest rates, or our financial condition or credit rating at the time. Future uncertainty in the U.S. and international markets and economies may adversely affect our liquidity, our ability to access the debt or capital markets and our financial condition.

Capital expenditures incurred for the nine months ended September 30, 2020 were $7.2 million, excluding expenditures of $4.7 million associated with the restart project at Hawesville. We estimate our total capital spending in 2020, excluding the Hawesville restart project, will be approximately $10.0 million related to ongoing investment projects at our plants.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

Commodity Price and Raw Material Costs Sensitivities

Aluminum is an internationally traded commodity, and its price is effectively determined on the LME plus any regional premium (e.g. the Midwest premium for aluminum sold in the United States and the European Duty Paid premium for metal sold into Europe) and any product premiums. From time to time, we may manage our exposure to fluctuations in the LME price of primary aluminum and/or the regional premium through financial instruments designed to protect our downside price risk exposure. From time to time, we also enter into financial contracts to offset fixed price sales arrangements with certain of our customers (the "fixed for floating swaps").   

We are also exposed to price risk for alumina which is one of the largest components of our cost of goods sold. Certain of the alumina we purchase is priced based on a published alumina index. As a result, our cost structure is exposed to market fluctuations and price volatility. Because we sell our products based principally on the LME price for primary aluminum, regional premiums and value-added product premiums, we are not able to directly pass on increased production costs to our customers. From time to time, we may manage our exposure to fluctuations in our alumina costs by purchasing certain of our alumina requirements under supply contracts with prices tied to the same indices as our aluminum sales contracts (the LME price of primary aluminum).

Market-Based Power Price Sensitivity

Market-Based Electrical Power Agreements

Hawesville and Sebree have market-based electrical power agreements pursuant to which EDF and Kenergy purchase electrical power on the open market and pass it through at MISO energy pricing, plus transmission and other costs incurred by them. Seventy five percent (75%) of Mt. Holly's electric power requirements were supplied at rates based on natural gas prices. See Note 10. Commitments and Contingencies to the consolidated financial statements included herein for additional information about these market-based power agreements.

Power is supplied to Grundartangi from hydroelectric and geothermal sources under long-term power purchase agreements. These power purchase agreements, which will expire on various dates from 2023 through 2036 (subject to extension), primarily provide power at LME-based variable rates. However, the price of approximately thirty percent (30%) of Grundartangi's power requirement is linked to the market price for power in the Nord Pool power market.

From time to time, we may manage our exposure to fluctuations in the market price of power through financial instruments designed to protect our downside risk exposure. 

Electrical Power Price Sensitivity

With the movement toward market-based power supply agreements, we have increased our exposure to fluctuations in the price of power on the MISO and Nord Pool power markets as well as the price of natural gas. Power represents one of our largest operating costs, so changes in the price of market power could significantly impact the profitability and viability of our operations. Transmission line outages, problems with grid stability or limitations on energy import capability could also increase power prices, disrupt production through pot instability or force a curtailment of all or part of the production at these facilities. In addition, indirect factors that lead to power cost increases, such as any increasing prices for natural gas or coal, fluctuations in or extremes in weather patterns or new or more stringent environmental regulations may severely impact our financial condition, results of operations and liquidity.

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The consumption shown in the table below reflects each operation at 100% capacity and does not reflect partial production curtailments.

	Hawesville		Sebree		Mt. Holly		Grundartangi		Total
Expected average load (in megawatts ("MW"))	482		385		400		537		1,804
Quarterly estimated electrical power usage (in megawatt hours ("MWh"))	1,055,580		843,150		876,000		1,176,030		3,950,760
Quarterly cost impact of an increase or decrease of $1 per MWh (in millions)	$	1.1	$	0.8	$	0.9	$	1.2	$	4.0
Annual expected electrical power usage (in MWh)	4,222,320		3,372,600		3,504,000		4,704,120		15,803,040
Annual cost impact of an increase or decrease of $1 per MWh (in millions)	$	4.2	$	3.4	$	3.5	$	4.7	$	15.8

Foreign Currency

We are exposed to foreign currency risk due to fluctuations in the value of the U.S. dollar as compared to the Icelandic krona ("ISK"), the Euro, the Chinese renminbi and other currencies.  Grundartangi’s labor costs, part of its maintenance costs and other local services are denominated in ISK and a portion of its anode costs are denominated in Euros and Chinese renminbi.  We also have deposits denominated in ISK in Icelandic banks and our estimated payments of Icelandic income taxes and any associated refunds are denominated in ISK. Further, Vlissingen's labor costs, maintenance costs and other local services are denominated in Euros and our existing Nord Pool power price swaps described above are settled in Euros. As a result, an increase or decrease in the value of those currencies relative to the U.S. dollar would affect Grundartangi and Vlissingen’s operating margins.

We may manage our exposure by entering into foreign currency forward contracts or option contracts for forecasted transactions and projected cash flows for foreign currencies in future periods.  We have entered into financial contracts to hedge the risk of fluctuations associated with the Euro under our Nord Pool power price swaps (the "FX swaps").

Natural Economic Hedges

Any analysis of our exposure to the commodity price of aluminum should consider the impact of natural hedges provided by certain contracts that contain pricing indexed to the LME price for primary aluminum. Certain of our alumina contracts and a substantial portion of Grundartangi’s electrical power requirements are indexed to the LME price for primary aluminum and provide a natural hedge for a portion of our production.

Risk Management

Any metals, power, natural gas and foreign currency risk management activities are subject to the control and direction of senior management within guidelines established by Century’s Board of Directors. These activities are regularly reported to Century’s Board of Directors.

Fair Values and Sensitivity Analysis

The following tables present the fair value of our derivative asset and liabilities as of September 30, 2020 and the effect on the fair value of a hypothetical ten percent (10%) adverse change in the market prices in effect at September 30, 2020. Our risk management activities do not include any trading or speculative transactions.

	Asset Fair Value		Fair Value with 10% Adverse Price Change
Commodity contracts (1)	$	17.0	$	7.6
Foreign exchange contracts (2)	1.0		—
Total	$	18.0	$	7.6

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	Liability Fair Value		Fair Value with 10% Adverse Price Change
Commodity contracts (1)	$	5.7	$	19.7
Foreign exchange contracts (2)	—		3.1
Total	$	5.7	$	22.8

(1) Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, Hawesville L4 power price swaps, fixed for floating swaps, and Nord Pool power price swaps.

(2) Foreign exchange contracts reflect our outstanding FX swaps.

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Item 4. Controls and Procedures

a. Evaluation of Disclosure Controls and Procedures

As of September 30, 2020, we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures. Based upon that evaluation, our management, including the Chief Executive Officer and Chief Financial Officer, concluded that our disclosure controls and procedures were effective as of September 30, 2020.

b. Changes in Internal Control over Financial Reporting

During the three months ended September 30, 2020, there were no changes in our internal control over financial reporting that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II – OTHER INFORMATION

Item 1. Legal Proceedings

We are a party from time to time in various legal actions arising in the normal course of business, the outcomes of which, in the opinion of management, neither individually nor in the aggregate are likely to result in a material adverse effect on our financial condition, results of operations or liquidity. For information regarding legal proceedings pending against us at September 30, 2020, refer to Note 10. Commitments and Contingencies to the consolidated financial statements included herein.

Item 1A. Risk Factors

The following is an update to the risk factors set forth in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 and our Quarterly Report on Form 10-Q for the quarter ended March 31, 2020. Other than the following update, there have been no material changes to the risk factors previously disclosed under the heading "Risk Factors" in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 and our Quarterly Report on Form 10-Q for the quarter ended March 31, 2020. You should carefully consider the risk factors set forth below and those contained in our Annual Report on Form 10-K, our Quarterly Reports on Form 10-Q and our other filings made with the Securities and Exchange Commission. You should be aware that these risk factors and other information may not describe every risk facing our Company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

If we are unable to enter into a long term, market-based, power arrangement for Mt. Holly, we may choose, or be forced, to further curtail operations at the Mt. Holly plant.

Mt. Holly purchases power pursuant to a power purchase agreement (the "Santee Cooper Agreement") with the South Carolina Public Service Authority ("Santee Cooper"). The term of the Santee Cooper Agreement expires on December 31, 2020. Under the Santee Cooper Agreement, Mt. Holly is required to purchase 25% of its power requirements from Santee Cooper's generation at a standard cost-based industrial rate, which is substantially higher than the market-based rate Mt. Holly pays for the remaining 75% of its power. Mt. Holly's inability to access the open market for 100% of its power requirements significantly impacts its ability to be competitive in the aluminum industry. As a result of such uncompetitive power prices, in 2015 Mt. Holly curtailed approximately 50% of its production capacity. We continue to seek the ability to access the open market for 100% of our power requirements at Mt. Holly and to pursue every reasonable alternative available to us to achieve this objective. There can be no assurance, however, that we will be successful in these efforts before the Santee Cooper Agreement expires on December 31, 2020. If we are unable to secure a long term power arrangement for 100% of Mt. Holly's power requirements on competitive terms before December 31, 2020, we may choose, or be forced, to further curtail operations at the plant. On October 20, 2020, we issued a notice to Mt. Holly employees of our intent to curtail 100% of the Mt. Holly smelter operations by no later than December 31, 2020 if a competitively priced power arrangement has not been secured.

Closure of the Mt. Holly facility would impose various costs on us that could have a material adverse effect on our business, financial condition, results of operations and liquidity and could cause us to write down the book value of the Mt. Holly facility. In addition, the ongoing uncertainty regarding the future operation of Mt. Holly may damage our relationships with our customers, suppliers, employees and other stakeholders, whether or not Mt. Holly is ultimately closed. We may need to take actions to terminate certain customer and supply contracts or curtail additional production in advance of any plant closure. Customers and suppliers may also become unwilling to renew existing contracts or enter into new contracts with us. It may also become more difficult to attract and retain employees. Such actions and events could have a material adverse effect on our business, financial condition, results of operations and liquidity.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

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Item 5. Other Information

Disclosure pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act

Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 (“ITRA”), effective August 10, 2012, added a new subsection (r) to Section 13 of the Exchange Act, which requires issuers that file periodic reports with the SEC to disclose in their annual and quarterly reports whether, during the reporting period, they or any of their

“affiliates” (as defined in Rule 12b-2 under the Exchange Act) have knowingly engaged in specified activities or

transactions relating to Iran, including activities not prohibited by U.S. law and conducted outside the U.S. by non-

U.S. affiliates in compliance with applicable laws. Issuers must also file a notice with the SEC if any disclosable

activity under ITRA has been included in an annual or quarterly report.

Because the SEC defines the term “affiliate” broadly, our largest stockholder may be considered an affiliate of the

Company despite the fact that the Company has no control over its largest stockholder’s actions or the actions of its

affiliates. As such, pursuant to Section 13(r)(1)(D)(iii) of the Exchange Act, the Company hereby discloses the

following information provided by our largest stockholder regarding transactions or dealings with entities controlled

by the Government of Iran (“the GOI”):

During the quarter ended September 30, 2020, non-U.S. affiliates of the largest stockholder of the Company (“the non-U.S. Stockholder Affiliates”) entered into sales contracts for agricultural products with, or for delivery to or from Iranian entities wholly or majority owned by the GOI. The non-U.S. Stockholder Affiliates performed their obligations under the contracts in compliance with applicable sanction laws and, where required, with the necessary prior approvals by the relevant governmental authorities.

The gross revenue of the non-U.S. Stockholder Affiliates related to the contracts did not exceed the value of USD $131 million for the quarter ended September 30, 2020.

The non-U.S. Stockholder Affiliates do not allocate net profit on a country-by-country or activity-by-activity basis, but estimate that the net profit attributable to the contracts would not exceed a small fraction of the gross revenue from such contracts. It is not possible to determine accurately the precise net profit attributable to such contracts.

The contracts disclosed above do not violate applicable sanctions laws administered by the U.S. Department of the Treasury, Office of Foreign Assets Control, and are not the subject of any enforcement action under Iran sanction laws.

The non-U.S. Stockholder Affiliates expect to continue to engage in similar activities in the future in compliance with applicable economic sanctions and in conformity with U.S. secondary sanctions.

The Company and its global subsidiaries had no transactions or activities requiring disclosure under ITRA, nor were we involved in the transactions described in this section. As of the date of this report, the Company is not aware of any other activity, transaction or dealing by it or any of its affiliates during the quarter ended September 30, 2020 that requires disclosure in this report under Section 13(r) of the Exchange Act.  

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Item 6. Exhibits

Exhibit Number	Description of Exhibit	Incorporated by Reference			Filed Herewith
		Form	File No.	Filing Date
31.1	Rule 13a-14(a)/15d-14(a) Certification of the Chief Executive Officer				X
31.2	Rule 13a-14(a)/15d-14(a) Certification of the Chief Financial Officer				X
32.1	Section 1350 Certification (pursuant to Sarbanes-Oxley Section 906) by Chief Executive Officer				X
32.2	Section 1350 Certification (pursuant to Sarbanes-Oxley Section 906) by Chief Financial Officer				X
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	Inline XBRL Taxonomy Extension Schema				X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase				X
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase				X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase				X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase				X
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			Century Aluminum Company
Date:	November 5, 2020	By:	/s/ CRAIG CONTI
			Craig Conti
			Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date:	November 5, 2020	By:	/s/ ELISABETH INDRIANI
			Elisabeth Indriani
			Global Controller (Principal Accounting Officer)

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EX-31.1

EXHIBIT 31.1

CERTIFICATION OF DISCLOSURE IN CENTURY ALUMINUM COMPANY'S

QUARTERLY REPORT FILED ON FORM 10-Q

I, Michael A. Bless, certify that:

1)I have reviewed this quarterly report on Form 10-Q of Century Aluminum Company;

2)Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5)The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	November 5, 2020
		/s/ MICHAEL A. BLESS
		Name:  Michael A. Bless
		Title:  President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF DISCLOSURE IN CENTURY ALUMINUM COMPANY'S

QUARTERLY REPORT FILED ON FORM 10-Q

I, Craig Conti, certify that:

1)I have reviewed this quarterly report on Form 10-Q of Century Aluminum Company;

2)Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5)The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	November 5, 2020
		/s/ CRAIG CONTI
		Name:  Craig Conti
		Title:  Executive Vice President and Chief Financial Officer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350)

In connection with the quarterly report on Form 10-Q of Century Aluminum Company (the “Company”) for the quarter ended September 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Michael A. Bless, as President and Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

1.This Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in this Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ MICHAEL A. BLESS
By:	Michael A. Bless
Title:	President and Chief Executive Officer (Principal Executive Officer)
Date:	November 5, 2020

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350)

In connection with the quarterly report on Form 10-Q of Century Aluminum Company (the “Company”) for the quarter ended September 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Craig Conti, as Executive Vice President and Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

1.This Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in this Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ CRAIG CONTI
By:	Craig Conti
Title:	Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date:	November 5, 2020

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

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Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 29, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-34474
Entity Registrant Name	Century Aluminum Company
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3070826
Entity Address, Address Line One	One South Wacker Drive
Entity Address, Address Line Two	Suite 1000
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	696-3101
Title of 12(b) Security	Common Stock, $0.01 par value per share
Entity Trading Symbol	CENX
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		89,484,834
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 Central Index Key	0000949157
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
NET SALES
Related parties	$ 235.8	$ 282.3	$ 792.4	$ 898.7
Other customers	157.1	155.7	423.6	502.5
Total net sales	392.9	438.0	1,216.0	1,401.2
Cost of goods sold	420.0	451.7	1,251.3	1,431.8
Gross profit (loss)	(27.1)	(13.7)	(35.3)	(30.6)
Selling, general and administrative expenses	11.0	11.6	31.7	38.2
Other operating (income) expense - net	(0.2)	(0.1)	0.3	0.4
Operating income (loss)	(37.9)	(25.2)	(67.3)	(69.2)
Interest expense - Hawesville term loan	(0.4)	(0.8)	(1.6)	(1.3)
Interest expense	(9.1)	(5.6)	(21.0)	(17.3)
Interest income	0.1	0.2	0.6	0.6
Net gain (loss) on forward and derivative contracts	(9.4)	10.3	(1.9)	10.7
Loss on early extinguishment of debt	(1.2)	0.0	(1.2)	0.0
Other income (expense) - net	0.0	(0.9)	3.0	(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(57.9)	(22.0)	(89.4)	(78.1)
Income tax benefit (expense)	(0.3)	1.3	1.6	5.7
Income (loss) before equity in earnings of joint ventures	(58.2)	(20.7)	(87.8)	(72.4)
Loss on sale of BHH	0.0	0.0	0.0	(4.3)
Equity in earnings of joint ventures	0.0	0.0	0.0	0.7
Net income (loss)	$ (58.2)	$ (20.7)	$ (87.8)	$ (76.0)
EARNINGS (LOSS) PER COMMON SHARE:
Basic and diluted (USD per share)	$ (0.65)	$ (0.23)	$ (0.98)	$ (0.86)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic and diluted (per share)	89.5	88.9	89.4	88.6

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive income (loss):
Net income (loss)	$ (58.2)	$ (20.7)	$ (87.8)	$ (76.0)
Other comprehensive income before income tax effect:
Net income (loss) on foreign currency cash flow hedges reclassified as income	(0.1)	(0.0)	(0.1)	(0.1)
Defined benefit plans and other postretirement benefits:
Amortization of prior service benefit (cost) during the period	(0.7)	(1.2)	(2.3)	(3.8)
Amortization of net gain (loss) during the period	2.1	2.2	6.5	6.7
Other comprehensive income (loss) before income tax effect	1.3	1.0	4.1	2.8
Income tax effect	(0.2)	(0.3)	(0.8)	(0.8)
Other comprehensive income (loss)	1.1	0.7	3.3	2.0
Total comprehensive income (loss)	$ (57.1)	$ (20.0)	$ (84.5)	$ (74.0)

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 81.4	$ 38.9
Restricted cash	3.7	0.8
Accounts receivable - net	50.6	70.1
Due from affiliates	15.0	30.1
Inventories	267.5	320.6
Derivative assets	10.6	14.6
Prepaid and other current assets	14.5	12.2
Total current assets	443.3	487.3
Property, plant and equipment - net	899.7	949.2
Due from affiliates - less current portion	1.3	0.5
Other assets	61.1	62.7
TOTAL	1,405.4	1,499.7
LIABILITIES:
Accounts payable, trade	85.6	97.1
Due to affiliates	2.9	32.9
Accrued and other current liabilities	69.5	61.5
Accrued employee benefits costs	10.4	10.4
Hawesville term loan	20.0	20.0
U.S. revolving credit facility	5.0	4.0
Industrial revenue bonds	7.8	7.8
Total current liabilities	201.2	233.7
Senior notes payable	242.8	249.2
Hawesville term loan - less current portion	5.0	20.0
Iceland revolving credit facility	45.0	0.0
Accrued pension benefits costs - less current portion	56.0	60.8
Accrued postretirement benefits costs - less current portion	98.8	100.7
Other liabilities	46.2	42.4
Leases - right of use liabilities	23.4	22.8
Deferred taxes	94.6	95.1
Total noncurrent liabilities	611.8	591.0
COMMITMENTS AND CONTINGENCIES	0.0	0.0
SHAREHOLDERS’ EQUITY:
Preferred stock	0.0	0.0
Common stock	1.0	1.0
Additional paid-in capital	2,528.4	2,526.5
Treasury stock, at cost	(86.3)	(86.3)
Accumulated other comprehensive loss	(106.5)	(109.8)
Accumulated deficit	(1,744.2)	(1,656.4)
Total shareholders’ equity	592.4	675.0
TOTAL	$ 1,405.4	$ 1,499.7

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (87.8)	$ (76.0)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Loss on sale of BHH	0.0	4.3
Unrealized (gain) loss on derivative instruments	2.3	(10.9)
Lower of cost or NRV inventory adjustment	40.8	15.8
Depreciation and amortization	61.7	63.0
Loss on early extinguishment of debt	1.0	0.0
Other non-cash items - net	1.5	(5.9)
Change in operating assets and liabilities:
Accounts receivable - net	19.5	10.7
Due from affiliates	14.9	(0.2)
Inventories	12.3	5.7
Prepaid and other current assets	(1.0)	3.8
Accounts payable, trade	(12.0)	(11.3)
Due to affiliates	(29.9)	(10.3)
Accrued and other current liabilities	6.7	8.4
Ravenswood retiree medical settlement	(2.0)	(2.0)
Other - net	5.3	0.5
Net cash provided by (used in) operating activities	33.3	(4.4)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(11.5)	(39.9)
Proceeds from sales of property, plant & equipment	0.1	0.0
Proceeds from sale of joint venture	0.0	10.5
Net cash provided by (used in) investing activities	(11.4)	(29.4)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt	(250.0)	0.0
Proceeds from issuance of debt	243.8	0.0
Borrowing under Hawesville term loan	0.0	40.0
Repayments on Hawesville term loan	(15.0)	0.0
Borrowings under revolving credit facilities	173.6	314.6
Repayments under revolving credit facilities	(127.6)	(337.5)
Debt issuance costs	(1.1)	0.0
Debt retirement costs	(0.2)	0.0
Other short-term borrowings	0.0	3.4
Repayment on other short-term borrowings	0.0	(3.4)
Issuance of common stock	0.0	0.3
Net cash provided by (used in) financing activities	23.5	17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	45.4	(16.4)
Cash, cash equivalents and restricted cash, beginning of period	39.7	39.7
Cash, cash equivalents and restricted cash, end of period	85.1	23.3
Cash paid for:
Interest	14.1	11.6
Taxes	0.1	0.3
Non-cash investing activities:
Capital expenditures	$ 0.4	$ 3.9

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Cumulative effect, period of adoption, adjustment [Member]	[1]	Preferred stock [Member]	Common stock [Member]	Additional paid-in capital [Member]	Treasury stock, at cost [Member]	Accumulated other comprehensive loss [Member]	Accumulated other comprehensive loss [Member] Cumulative effect, period of adoption, adjustment [Member]	[1]	Accumulated deficit [Member]	Accumulated deficit [Member] Cumulative effect, period of adoption, adjustment [Member]	[1]
Balance, start at Dec. 31, 2018	$ 762.2	$ 0.0		$ 0.0	$ 1.0	$ 2,523.0	$ (86.3)	$ (98.7)	$ (1.3)		$ (1,576.8)	$ 1.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(76.0)										(76.0)
Other comprehensive income (loss)	2.0							2.0
Share-based compensation	1.8				0.0	1.8
Conversion of preferred stock to common stock	0.0			0.0	0.0	(0.0)
Balance, end at Sep. 30, 2019	$ 689.9			0.0	1.0	2,524.8	(86.3)	(98.0)			(1,651.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201802Member
Balance, start at Jun. 30, 2019	$ 709.4			0.0	1.0	2,524.3	(86.3)	(98.7)			(1,630.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(20.7)										(20.7)
Other comprehensive income (loss)	0.7							0.7
Share-based compensation	0.5					0.5
Conversion of preferred stock to common stock	0.0			0.0	0.0	0.0
Balance, end at Sep. 30, 2019	689.9			0.0	1.0	2,524.8	(86.3)	(98.0)			(1,651.6)
Balance, start at Dec. 31, 2019	675.0			0.0	1.0	2,526.5	(86.3)	(109.8)			(1,656.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(87.8)										(87.8)
Other comprehensive income (loss)	3.3							3.3
Share-based compensation	1.9				0.0	1.9
Conversion of preferred stock to common stock	0.0			0.0	0.0	0.0
Balance, end at Sep. 30, 2020	592.4			0.0	1.0	2,528.4	(86.3)	(106.5)			(1,744.2)
Balance, start at Jun. 30, 2020	648.7			0.0	1.0	2,527.6	(86.3)	(107.6)			(1,686.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(58.2)										(58.2)
Other comprehensive income (loss)	1.1							1.1
Share-based compensation	0.8					0.8
Conversion of preferred stock to common stock	0.0			0.0	0.0	0.0
Balance, end at Sep. 30, 2020	$ 592.4			$ 0.0	$ 1.0	$ 2,528.4	$ (86.3)	$ (106.5)			$ (1,744.2)

[1] ASU 2018-02. See Note 7. Income Taxes for further information regarding our adoption of ASU 2018-02.

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General

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

General

General

The accompanying unaudited interim consolidated financial statements of Century Aluminum Company should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2019. In management’s opinion, the unaudited interim consolidated financial statements reflect all adjustments, which are of a normal and recurring nature, that are necessary for a fair presentation of financial results for the interim periods presented. Operating results for the first nine months of 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. Throughout this Form 10-Q, and unless expressly stated otherwise or as the context otherwise requires, "Century Aluminum," "Century," the "Company," "we," "us," "our" and "ours" refer to Century Aluminum Company and its consolidated subsidiaries.

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes." Amendments include the removal of certain exceptions to the general principles of ASC 740 and to improve and simplify accounting for income taxes by clarifying and amending existing guidance. Updates are related to intraperiod tax allocation, interim period tax calculations, tax laws or rate changes in interim periods, and income taxes related to employee stock ownership plans. The ASU is effective for fiscal years beginning after December 15, 2020, including interim periods therein and early adoption is permitted. The Company is currently evaluating the impacts of ASU 2019-12 and we do not expect the adoption to have a material effect on the consolidated financial statements.

In March 2020, the Securities and Exchange Commission (“SEC”) issued a final rule that amends the disclosure requirements related issuers and guarantors of certain registered securities under SEC Regulation S-X Rule 3-10. The final rule allows registrants to provide alternative financial disclosures in either the registrant’s MD&A or financial statements, rather than the previous requirement under Rule 3-10, which required condensed consolidating financial information within the financial statements. It also simplifies the requirements in Rule 3-10 that currently must be met for a parent company to qualify for exceptions allowing it to provide alternative disclosures rather than full audited financial statements. The ruling also reduces the periods for which summarized financial information is required to be presented to the most recent (1) annual period and (2) year-to-date interim period. The final rule applies to annual reports on Form 10-K for fiscal years ending after January 4, 2021 and quarterly reports on Form 10-Q for quarterly periods ending after January 4, 2021 and registrants may voluntarily comply with the final rule before the effective date. The Company does not expect the future adoption, which is limited to disclosures only, to have a material effect on the Company’s consolidated financial statements.

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Related Party Transactions

9 Months Ended

Sep. 30, 2020

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

The significant related party transactions occurring during the nine months ended September 30, 2020 and 2019 are described below. We believe all of our transactions with related parties are at prices that approximate market.

Glencore ownership

As of September 30, 2020, Glencore plc and its affiliates (together "Glencore") beneficially owned 42.9% of Century’s outstanding common stock (46.8% on a fully-diluted basis assuming the conversion of all of the Series A Convertible Preferred Stock) and all of our outstanding Series A Convertible Preferred Stock. See Note 6. Shareholders' Equity for a description of our outstanding Series A Convertible Preferred Stock. From time to time, Century and Glencore enter into various transactions for the purchase and sale of primary aluminum, purchase and sale of alumina, tolling agreements, certain forward financial contracts and loan agreements.

Sales to Glencore

For the three months ended September 30, 2020 and 2019, approximately 60.0% and 64.5%, respectively, of our consolidated net sales were made to Glencore, while for the nine months ended September 30, 2020 and 2019, we derived 65.2% and 64.1%, respectively, of our consolidated net sales from sales to Glencore.

Glencore purchases aluminum produced at our U.S smelters at prices based on the London Metal Exchange (the "LME") plus the Midwest regional delivery premium plus any additional market-based product premiums. Glencore purchases aluminum produced at our Grundartangi, Iceland smelter at prices based on the LME plus the European Duty Paid premium plus any additional market-based product premiums.

We have also entered into agreements with Glencore pursuant to which we sell certain amounts of alumina at market-based prices. For the three months and nine months ended September 30, 2020, we recorded $16.4 million and $17.6 million of revenue related to alumina sales to Glencore, respectively. For the three months and nine months ended September 30, 2019, we recorded $4.5 million and $26.2 million of revenue related to alumina sales to Glencore, respectively.

Purchases from Glencore

We purchase a portion of our alumina requirements from Glencore. Alumina purchases from Glencore during the nine months ended September 30, 2020 were priced based on published alumina and aluminum indices.

Financial contracts with Glencore

We have certain financial contracts with Glencore. See Note 13. Derivatives regarding these forward financial sales contracts.

Hawesville Term Loan

On April 29, 2019, we entered into a loan agreement with Glencore Ltd. pursuant to which the Company borrowed $40.0 million (the "Hawesville Term Loan”).  See Note 9. Debt for additional information. Borrowings under the Hawesville Term Loan were used to partially finance the second phase of the Hawesville restart project.

Summary

A summary of the aforementioned significant related party transactions is as follows: 

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Net sales to Glencore	$	235.8	$	282.3	$	792.4	$	898.7
Purchases from Glencore	63.7		43.6		137.3		249.8
Purchases from BHH (1)	—		2.2		—		16.8

(1) We previously owned a 40% interest in Baise Haohai Carbon Co. Ltd. ("BHH") and purchased carbon anodes from them for use in our operations. Purchases represented herein were prior to the divestiture of our interest in BHH in May 2019.

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Revenue

9 Months Ended

Sep. 30, 2020

Revenue Recognition and Deferred Revenue [Abstract]

Revenue

Revenue

We disaggregate our revenue by geographical region as follows:

Net Sales	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
United States	$	242.0	$	277.1	$	764.0	$	911.9
Iceland	150.9		160.9		452.0		489.3
Total	$	392.9	$	438.0	$	1,216.0	$	1,401.2

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Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

We measure certain of our assets and liabilities at fair value. Fair value represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.

The fair value hierarchy provides transparency regarding the inputs we use to measure fair value. We categorize each fair value measurement in its entirety into the following three levels, based on the lowest level input that is significant to the entire measurement:

•Level 1 Inputs - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.

•Level 2 Inputs - inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.

•Level 3 Inputs - significant unobservable inputs for the asset or liability.

Recurring Fair Value Measurements	As of September 30, 2020
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	71.2	$	—	$	—	$	71.2
Trust assets (1)	0.2		—		—		0.2
Derivative instruments	—		11.4		6.6		18.0
TOTAL	$	71.4	$	11.4	$	6.6	$	89.4
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		4.9		0.8		5.7
TOTAL	$	—	$	4.9	$	0.8	$	5.7

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

Recurring Fair Value Measurements	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	23.3	$	—	$	—	$	23.3
Trust assets (1)	0.2		—		—		0.2
Surety bonds (2)	1.8		—		—		1.8
Derivative instruments	—		9.1		10.6		19.7
TOTAL	$	25.3	$	9.1	$	10.6	$	45.0
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		1.3		2.9		4.2
TOTAL	$	—	$	1.3	$	2.9	$	4.2

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

(2) Surety bonds were invested in U.S. treasury bills and represent collateral against our workers' compensation insurance policy.

We use the following valuation techniques and inputs for fair value measurements categorized within Level 2 of the fair value hierarchy:

Level 2 Fair Value Measurements:
Asset / Liability	Level	Valuation Techniques	Inputs
LME forward financial sales contracts	2	Discounted cash flows	Quoted LME forward market
MWP forward financial sales contracts	2	Discounted cash flows	Quoted MWP forward market
Fixed for floating swaps	2	Discounted cash flows	Quoted LME forward market, quoted MWP forward market
Nord Pool power price swaps	2	Discounted cash flows	Quoted Nord Pool forward market
MISO Indiana Hub power price swaps	2	Discounted cash flows	Quoted Indy Hub forward market
FX swaps	2	Discounted cash flows	Euro/USD forward exchange rate

When valuing Level 3 assets and liabilities, we use certain significant unobservable inputs. Management incorporates various inputs and assumptions including forward commodity prices, commodity price volatility, and macroeconomic conditions, including interest rates and discount rates. Our estimates of significant unobservable inputs are ultimately based on our estimates of risks that market participants would consider when valuing our assets and liabilities.

The following table presents the inputs for fair value measurements categorized within Level 3 of the fair value hierarchy, along with information regarding significant unobservable inputs used to value Level 3 assets and liabilities:

Level 3 Fair Value Measurements:
Asset / Liability	Fair Value at September 30, 2020		Valuation Technique	Observable Inputs	Significant Unobservable Input	Value/Range of Unobservable Input
LME forward financial sales contracts	$	6.6	Discounted cash flows	Quoted LME forward market prices	Discount rate (1)	10.00%
Contingent obligation	$	—	Discounted cash flows	Quoted LME forward market prices	Management's estimates of the LME forward market price beyond the quoted periods (2)	$1,754/T-$2,312/T
Hawesville L4 power price swaps	$	(0.8)	Discounted cash flows	Quoted Indy Hub forward market prices	Estimates of locational margin prices during contract term in megawatt hours (MWh) (3)	$0.45/MWh

(1) Represents risk adjusted discount rate.

(2) Represents the range of estimated forward LME prices of primary aluminum through the term of the agreement in December 2028.

(3) Represents historical average of locational margin prices from January 2017-September 2020

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis.

	Level 3 Assets		Level 3 Liabilities
For the three months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of July 1, 2020	$	6.1	$	(1.5)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	(4.2)		(0.2)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		0.9
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3	—		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	(4.2)	$	0.7

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

For the three months ended September 30, 2019	Level 3 Assets		Level 3 Liabilities
	U.S. LME forward financial sales contracts		Hawesville L4 Power Price Swaps
Balance as of July 1, 2019	$	6.9	$	(2.7)
Total realized/unrealized gains (losses)
Included in Net Income (1)	8.8		1.2
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		—
Transfers into Level 3	—		—
Transfers out of Level 3	—		—
Balance as of September 30, 2019	$	15.7	$	(1.5)
Change in unrealized gains (losses) (1)	$	8.8	$	1.2

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

	Level 3 Assets		Level 3 Liabilities
For the nine months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of January 1, 2020	$	10.6	$	(2.9)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	0.8		(1.6)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		3.7
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3 (3)	(9.5)		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	0.8	$	2.1

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

(3) Transfer out of Level 3 due to period of time remaining in derivative contract.

For the nine months ended September 30, 2019	Level 3 Assets				Level 3 Liabilities
	Nord Pool power price swaps		US LME forward financial sales contracts		Hawesville L4 Power Price Swaps		Iceland LME forward financial sales contracts		FX Swaps
Balance as of January 1, 2019	$	4.7	$	0.3	$	—	$	(0.2)	$	(0.3)
Total realized/unrealized gains (losses)
Included in Net Income (1)	(1.0)		15.6		1.2		(0.1)		(0.3)
Purchases, sales, settlements
Purchases	—		—		—		—		—
Sales	—		—		—		—		—
Settlements	—		—		—		—		—
Transfers into Level 3 (2)	—		(0.2)		(2.7)		—		—
Transfers out of Level 3	(3.7)		—		—		0.3		0.6
Balance as of September 30, 2019	$	—	$	15.7	$	(1.5)	$	—	$	—
Change in unrealized gains (losses) (1)	$	(1.0)	$	15.4	$	(1.5)	$	(0.1)	$	(0.3)

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfer into Level 3 resulting from derivative contracts entered into during the first nine months of 2019.

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Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Earnings (Loss) Per Share

Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive securities.

The following table shows the basic and diluted earnings (loss) per share:

	For the three months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(58.2)					$	(20.7)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(58.2)		89.5	$	(0.65)	$	(20.7)		88.9	$	(0.23)

	For the nine months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(87.8)					$	(76.0)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(87.8)		89.4	$	(0.98)	$	(76.0)		88.6	$	(0.86)

	Three months ended September 30,		Nine months ended September 30,
Securities excluded from the calculation of diluted EPS (in millions)(1):	2020	2019	2020	2019
Share-based compensation	1.7	0.7	1.2	0.6

(1) In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their anti-dilutive effect on earnings (loss) per share.

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Shareholders’ Equity

9 Months Ended

Sep. 30, 2020

Stockholders' Equity Note [Abstract]

Shareholders’ Equity

Shareholders’ Equity

Common Stock

As of September 30, 2020 and December 31, 2019, we had 195,000,000 shares of common stock, $0.01 par value per share, authorized under our Restated Certificate of Incorporation, of which 96,671,355 shares were issued and 89,484,834 shares were outstanding at September 30, 2020; 96,372,182 shares were issued and 89,185,661 shares were outstanding at December 31, 2019.

The rights, preferences and privileges of holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of our preferred stock which are currently outstanding, including our Series A Convertible Preferred Stock, or which we may designate and issue in the future.

Preferred Stock

As of September 30, 2020 and December 31, 2019, we had 5,000,000 shares of preferred stock, $0.01 par value per share, authorized under our Restated Certificate of Incorporation. In 2008, we issued 160,000 shares of our Series A Convertible Preferred Stock. Glencore holds all of the issued and outstanding Series A Convertible Preferred Stock. At September 30, 2020 and December 31, 2019, there were 66,039 and 67,323 shares of Series A Convertible Preferred Stock outstanding, respectively.

The issuance of common stock under our stock incentive programs, debt exchange transactions and any stock offering that excludes Glencore participation triggers anti-dilution provisions of the preferred stock agreement and results in the automatic conversion of Series A Convertible Preferred Stock shares into shares of common stock. The conversion ratio of preferred to common shares is 100 shares of common stock for each share of preferred stock.   

The Common and Preferred Stock table below contains additional information about preferred stock conversions during the nine months ended September 30, 2020 and 2019.

	Preferred stock	Common stock
Common and Preferred Stock Activity (in shares):	Series A Convertible	Treasury	Outstanding
Beginning balance as of December 31, 2019	67,323	7,186,521	89,185,661
Conversion of convertible preferred stock	(1,284)	—	128,389
Issuance for share-based compensation plans	—	—	170,784
Ending balance as of September 30, 2020	66,039	7,186,521	89,484,834
Beginning balance as of December 31, 2018	71,967	7,186,521	88,103,440
Conversion of convertible preferred stock	(3,392)	—	339,166
Issuance for share-based compensation plans	—	—	451,161
Ending balance as of September 30, 2019	68,575	7,186,521	88,893,767

Stock Repurchase Program

In 2011, our Board of Directors authorized a $60.0 million common stock repurchase program and during the first quarter of 2015, our Board of Directors increased the size of the program by $70.0 million. Under the program, Century is authorized to repurchase up to $130.0 million of our outstanding shares of common stock, from time to time, on the open market at prevailing market prices, in block trades or otherwise. The timing and amount of any shares repurchased will be determined by our management based on its evaluation of market conditions, the trading price of our common stock and other factors. The stock repurchase program may be suspended or discontinued at any time.

Shares of common stock repurchased are recorded at cost as treasury stock and result in a reduction of shareholders’ equity in the consolidated balance sheets. From time to time, treasury shares may be reissued as contributions to our employee benefit plans and for the conversion of convertible preferred stock. When shares are reissued, we use an average cost method for determining cost. The difference between the cost of the shares and the reissuance price is added to or deducted from additional

paid-in capital.We have repurchased 7,186,521 shares of common stock under the program for an aggregate purchase price of $86.3 million. We have made no repurchases since April 2015 and we have $43.7 million remaining under the repurchase program authorization as of September 30, 2020.

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Income Taxes

9 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

We recorded an income tax expense of $0.3 million and income tax benefit of $1.3 million for the three months ended September 30, 2020 and 2019, respectively. The change is primarily due to improved operational results from foreign operations in the current quarter. For the nine months ended September 30, 2020 and 2019, we recorded an income tax benefit of $1.6 million and $5.7 million, respectively, which is primarily the result of overall losses from our foreign operations.

Our income tax benefit or expense is based on an annual effective tax rate forecast, including estimates and assumptions that could change during the year. The application of the accounting requirements for income taxes in interim periods, after consideration of our valuation allowance, causes a significant variation in the typical relationship between income tax expense/benefit and pre-tax accounting income/loss.

As of September 30, 2020, all of Century's U.S. and certain foreign deferred tax assets, net of deferred tax liabilities, continue to be subject to a valuation allowance.

On January 1, 2019, the Company adopted ASU 2018-02, "Income Statement-Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income," which provides for the reclassification from accumulated other comprehensive income to retained earnings of stranded tax effects resulting from the Tax Cuts and Jobs Act ("the Act"). In accordance with the provisions of ASU 2018-02, $1.3 million of stranded tax effects related to the Act were reclassified from accumulated other comprehensive loss to retained earnings in the first quarter of 2019. This reclassification included the impact of the change in the federal corporate income tax rate and the related federal benefit of state taxes.

The Company’s accounting policy with respect to releasing income tax effects from accumulated other comprehensive income is to apply a security by security approach whereby the tax effects are measured based on the change in the unrealized gains or losses reflected in other comprehensive loss.

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was enacted in response to the coronavirus ("COVID-19") pandemic. The CARES Act is aimed at providing assistance and health care for individuals, families, and businesses affected by COVID-19 and generally supporting the U.S. economy. The CARES Act, among other things, includes provisions related to refundable payroll tax credits, deferment of the employer portion of social security payments, net operating loss carryback periods, modifications to the net interest deduction limitations, and technical corrections to tax depreciation methods for qualified improvement property. We continue to analyze the various aspects of the CARES Act to determine the impact specific provisions may have on us and our operations. As of September 30, 2020, Century does not expect to record material benefits from the CARES Act.

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Inventories

9 Months Ended

Sep. 30, 2020

Inventory, Net [Abstract]

Inventories

Inventories

Inventories consist of the following:

	September 30, 2020		December 31, 2019
Raw materials	$	75.2	$	101.3
Work-in-process	41.3		44.1
Finished goods	18.4		34.3
Operating and other supplies	132.6		140.9
Total inventories	$	267.5	$	320.6

Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out ("FIFO") or the weighted average cost method.

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Debt

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Debt

Debt

	September 30, 2020		December 31, 2019
Debt classified as current liabilities:
Hawesville Term Loan - current portion(1)	$	20.0	$	20.0
Hancock County industrial revenue bonds ("IRBs") due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (2)	7.8		7.8
U.S. Revolving Credit Facility(3)	5.0		4.0
Debt classified as non-current liabilities:
Iceland Revolving Credit Facility (4)	45.0		—
7.5% senior secured notes due June 2021, net of debt discount of $0.8 million at December 31, 2019	—		249.2
12.0% senior secured notes due June 2025, net of debt discount of $2.4 million and financing fees of $4.8 million at September 30, 2020, interest payable semiannually	242.8		—
Hawesville Term Loan - less current portion(1), principal and interest payable monthly	5.0		20.0
Total	$	325.6	$	301.0

(1) See "Hawesville Term Loan" below. At September 30, 2020, the applicable interest rate was LIBOR of 0.3% plus margin of 5.375% and there is no interest payable outstanding. As of September 30, 2020, we have made $15.0 million of principal payments and $1.6 million of interest payments.

(2) The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at September 30, 2020 was 0.34%.

(3) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 4.0%.

(4) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 3.2%.

12.0% Notes due 2025

General. On July 1, 2020, we issued $250.0 million in aggregate principal amount of 12.0% senior secured notes due 2025 (the "2025 Notes"). The 2025 Notes were issued at a discount and we received proceeds of $243.8 million, prior to payment of certain financing fees and related expenses.

Interest Rate. The 2025 Notes bear interest semi-annually in arrears on January 1 and July 1 of each year, beginning on January 1, 2021, at a rate of (i) 10.00% per annum in cash and (ii) 2.00% per annum in the form of additional notes or in cash, at our option.

Maturity. The 2025 Notes mature on July 1, 2025.

Seniority. The 2025 Notes are senior secured obligations of Century, ranking equally in right of payment with all existing and future senior indebtedness of Century, but effectively senior to unsecured debt to the extent of the value of the collateral.

Guaranty. Our obligations under the 2025 Notes are guaranteed by all of our existing and future domestic restricted subsidiaries (the “Guarantor Subsidiaries”), except for foreign owned holding companies, any domestic restricted subsidiary that owns no assets other than equity interests or other investments in foreign subsidiaries and certain immaterial subsidiaries, which guaranty shall in each case be a senior secured obligation of such Guarantor Subsidiaries, ranking equally in right of payment with all existing and future senior indebtedness of such Guarantor Subsidiaries but effectively senior to unsecured debt to the extent of the value of collateral.

Collateral. Our obligations under the 2025 Notes and the Guarantor Subsidiaries' obligations under the guarantees are secured by a pledge of and lien on (subject to certain exceptions):

(i) all of our and the Guarantor Subsidiaries' property, plant and equipment (other than certain excluded property);

(ii) all equity interests in subsidiaries directly owned by Century or any Guarantor Subsidiaries; and

(iii) proceeds of the foregoing.

Under certain circumstances, the indenture and the security documents governing the 2025 Notes will permit us and the guarantors to incur additional debt that also may be secured by liens on the collateral that are equal to or have priority over the liens securing the 2025 Notes. The collateral agent for the 2025 Notes will agree with the collateral agent for the other debt holders and us under such circumstances to enter into an intercreditor agreement that will cause the liens securing the 2025 Notes to be contractually subordinated to the liens securing such additional debt.

Redemption Rights. Prior to July 1, 2021, we may redeem the 2025 Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and if redeemed during the twelve-month period beginning on July 1 of the years indicated below, at the following redemption prices plus accrued and unpaid interest:

Year	Percentage
2021	105.0%
2022	102.5%
2023	101.25%
2024	100.0%

Upon a change of control (as defined in the indenture governing the 2025 Notes), we will be required to make an offer to purchase the 2025 Notes at a purchase price equal to 101% of the outstanding principal amount of the 2025 Notes on the date of the purchase, plus accrued and unpaid interest to the date of purchase.

Covenants. The indenture governing the 2025 Notes contains customary covenants which may limit our ability, and the ability of certain of our subsidiaries, to: (i) incur additional debt; (ii) incur additional liens; (iii) pay dividends or make distributions in respect of capital stock; (iv) purchase or redeem capital stock; (v) make investments or certain other restricted payments; (vi) sell assets; (vii) issue or sell stock of certain subsidiaries; (viii) enter into transactions with shareholders or affiliates; and (ix) effect a consolidation or merger.

7.5% Notes Tender Offer and Redemption

In June 2020, we commenced a tender offer to the holders of the outstanding 7.5% senior secured notes due June 2021 (the "2021 Notes") and notified all such holders of our election to redeem all 2021 Notes not purchased in the tender offer on July 31, 2020. We received tenders for approximately $243.7 million in aggregate principal amount of the 2021 Notes and the remaining 2021 Notes were redeemed on July 31, 2020 at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest. As a result, the Company’s and the guarantors’ obligations under the indenture governing the 2021 Notes have been fully discharged. We applied the net proceeds from the offering of the 2025 Notes described above, together with cash on hand, toward payment of the total consideration amount to holders whose 2021 Notes were accepted and purchased in the tender offer and to fund the redemption of any remaining 2021 Notes.

Based on the characteristics of the 2021 Notes and the 2025 Notes that were issued, the tender and redemption of the 2021 Notes are accounted for as an extinguishment of the debt. Accordingly, we have recorded a $1.2 million loss on early extinguishment of debt, consisting of the write-off of deferred financing costs and the debt discount associated with the 2021 Notes, as well as the tender fees paid as part of the tender offer.

Hawesville Term Loan

On April 29, 2019, we entered into a loan agreement with Glencore Ltd. pursuant to which the Company borrowed $40.0 million. Borrowings under the Hawesville Term Loan were used to partially finance the second phase of the Hawesville restart project. The Hawesville Term Loan matures on December 31, 2021 and is to be repaid in twenty-four (24) equal monthly

installments of principal, beginning on January 31, 2020.  The Hawesville Term Loan bears interest, due monthly, at a floating rate equal to LIBOR plus 5.375% per annum. The Hawesville Term Loan is not secured by any collateral. 

U.S. Revolving Credit Facility

We and certain of our direct and indirect domestic subsidiaries ("the Borrowers") have a senior secured revolving credit facility with a syndicate of lenders (as amended from time to time, the "U.S. revolving credit facility"). The U.S. revolving credit facility provides for borrowings of up to $175.0 million in the aggregate, including up to $110.0 million under a letter of credit sub-facility, and also includes an uncommitted accordion feature whereby borrowers may increase the capacity of the U.S. revolving credit facility by up to $50.0 million, subject to agreement with the lenders. The U.S. revolving credit facility matures on May 16, 2023.

Any letters of credit issued and outstanding under the U.S. revolving credit facility reduce our borrowing availability on a dollar-for-dollar basis. At September 30, 2020, there were $5.0 million in outstanding borrowings under our U.S. revolving credit facility. Principal payments, if any, are due upon maturity of the U.S. revolving credit facility and may be prepaid without penalty.

Status of our U.S. revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	175.0
Borrowing availability	124.6
Outstanding letters of credit issued	36.6
Outstanding borrowings	5.0
Borrowing availability, net of outstanding letters of credit and borrowings	83.0

Iceland Revolving Credit Facility

Our wholly-owned subsidiary, Nordural Grundartangi ehf ("Grundartangi"), has entered into a $50.0 million revolving credit facility agreement with Landsbankinn hf., dated November 2013, as amended (the "Iceland revolving credit facility"). At September 30, 2020, there were $45.0 million in outstanding borrowings under our Iceland revolving credit facility. The Iceland revolving credit facility has a term through November 2022. Principal payments, if any, are due upon maturity of the Iceland revolving credit facility and may be prepaid without penalty.

Status of our Iceland revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	50.0
Borrowing availability	50.0
Outstanding letters of credit issued	—
Outstanding borrowings	45.0
Borrowing availability, net of borrowings	5.0

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and contingencies

Commitments and Contingencies

We have pending against us or may be subject to various lawsuits, claims and proceedings related primarily to employment, commercial, stockholder, environmental, safety and health matters and are involved in other matters that may give rise to contingent liabilities. While the results of such matters and claims cannot be predicted with certainty, we believe that the ultimate outcome of any such matters and claims will not have a material adverse impact on our financial condition, results of operations or liquidity. However, because of the nature and inherent uncertainties of litigation and estimating liabilities, should the resolution or outcome of these actions be unfavorable, our business, financial condition, results of operations and liquidity could be materially and adversely affected.

In evaluating whether to accrue for losses associated with legal or environmental contingencies, it is our policy to take into consideration factors such as the facts and circumstances asserted, our historical experience with contingencies of a similar nature, the likelihood of our prevailing and the severity of any potential loss.  For some matters, no accrual is established because we have assessed our risk of loss to be remote.  Where the risk of loss is probable and the amount of the loss can be reasonably estimated, we record an accrual, either on an individual basis or with respect to a group of matters involving similar claims, based on the factors set forth above. While we regularly review the status of, and our estimates of potential liability associated with, contingencies to determine the adequacy of any associated accruals and related disclosures, the ultimate amount of loss may differ from our estimates.

Legal Contingencies

Vernon

In July 2006, we were named as a defendant, together with certain affiliates of Alcan Inc., in a lawsuit brought by Alcoa Inc. seeking to determine responsibility for certain environmental indemnity obligations related to the sale of a cast aluminum plate manufacturing facility located in Vernon, California, which we purchased from Alcoa Inc. in December 1998, and sold to Alcan Rolled Products-Ravenswood LLC in July 1999. The complaint also seeks costs and attorney fees. The matter was stayed by the court in 2008 to allow for the remediation of environmental areas at the site. On June 30, 2016, the U.S. District Court for the District of Delaware ordered the stay lifted and reopened the case. Discovery was completed in the third quarter of 2019. Trial was bifurcated and moved from March 2020 to February 2021 for Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA") issues and to a later undetermined date in 2021 for questions of fact. At this stage, we cannot predict the ultimate outcome of this action or estimate a range of reasonably possible losses related to this matter.

Ravenswood Retiree Medical Benefits

In November 2009, Century Aluminum of West Virginia ("CAWV") filed a class action complaint for declaratory judgment against the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union ("USW"), the USW’s local and certain CAWV retirees, individually and as class representatives ("CAWV Retirees"), seeking a declaration of CAWV’s rights to modify/terminate retiree medical benefits. Later in November 2009, the USW and representatives of a retiree class filed a separate suit against CAWV, Century Aluminum Company, Century Aluminum Master Welfare Benefit Plan, and various John Does with respect to the foregoing. 

On August 18, 2017, the District Court for the Southern District of West Virginia approved a settlement agreement in respect of these actions. Under the terms of the settlement agreement, CAWV agreed to make payments into a trust for the benefit of the CAWV Retirees in the aggregate amount of $23.0 million over the course of ten years. Upon approval of the settlement, we paid $5.0 million to the aforementioned trust in September 2017 and recognized a gain of $5.5 million to arrive at the-then net present value of $12.5 million. CAWV has agreed to pay the remaining amounts under the settlement agreement in annual increments of $2.0 million for nine years. As of September 30, 2020, $2.0 million was recorded in other current liabilities and $7.3 million was recorded in other liabilities.

PBGC Settlement

In 2013, we entered into a settlement agreement with the Pension Benefit Guarantee Corporation ("PBGC") regarding an alleged "cessation of operations" at our Ravenswood facility. Pursuant to the terms of the agreement, we agreed to make additional contributions (above any minimum required contributions) to our defined benefit pension plans totaling approximately $17.4 million. Under certain circumstances, in periods of lower primary aluminum prices relative to our cost of operations, we are able to defer one or more of these payments, provided that we provide the PBGC with acceptable security for such deferred payments. We did not make any contributions for the nine month periods ended September 30, 2020, and 2019. We have elected to defer certain payments under the PBGC agreement and have provided the PBGC with the appropriate security. The remaining contributions under this agreement are approximately $9.6 million.

Environmental Contingencies

Matters relating to the St. Croix Alumina Refining Facility

We are a party to a United States Environmental Protection Agency Administrative Order on Consent (the "Order") pursuant to which certain past and present owners of an alumina refining facility at St. Croix, Virgin Islands (the "St. Croix Alumina Refinery") have agreed to carry out a Hydrocarbon Recovery Plan to remove and manage hydrocarbons floating on groundwater underlying the facility.  Pursuant to the Hydrocarbon Recovery Plan, recovered hydrocarbons and groundwater are delivered to the adjacent petroleum refinery where they are received and managed. At this time, we are not able to estimate the amount of any future potential payments under this indemnification to comply with the Order, but we do not anticipate that any such amounts will have a material adverse effect on our financial condition, results of operations or liquidity, regardless of the final outcome.

In December 2010, Century was among several defendants named in a lawsuit filed by plaintiffs who either worked, resided or owned property in the area downwind from the St. Croix Alumina Refinery. In March 2011, Century was also named a defendant in a nearly identical suit brought by certain additional plaintiffs. The plaintiffs in both suits allege damages caused by the presence of red mud and other particulates coming from the alumina facility and are seeking unspecified monetary damages, costs and attorney fees as well as certain injunctive relief. We tendered indemnity and defense to St. Croix Alumina LLC and Alcoa Alumina & Chemical LLC under the terms of an acquisition agreement relating to the facility and have filed motions to dismiss plaintiffs’ claims. In August 2015, the Superior Court of the Virgin Islands, Division of St. Croix denied the motions to dismiss but ordered all plaintiffs to refile individual complaints. On February 28, 2018, plaintiffs in both cases filed a Motion for Voluntary Dismissal of Century without prejudice to refiling. At this time, it is not possible to predict the ultimate outcome of or to estimate a range of reasonably possible losses for any of the foregoing actions relating to the St. Croix Alumina Refinery.

Power Commitments and Contingencies

Hawesville

Hawesville has a power supply arrangement with Kenergy and EDF Trading North America, LLC (“EDF") which provides market-based power to the Hawesville smelter. Under this arrangement, the power companies purchase power on the open market and pass it through to Hawesville at Midcontinent Independent System Operator ("MISO") pricing plus transmission and other costs. The power supply arrangement with Kenergy has an effective term through December 2023. The arrangement with EDF to act as our market participant with MISO has an effective term through May 2022. Each of these agreements provide for automatic extension on a year-to-year basis unless a one year notice is given.

Sebree

Sebree has a power supply arrangement with Kenergy and EDF which provides market-based power to the Sebree smelter. Similar to the arrangement at Hawesville, the power companies purchase power on the open market and pass it through to Sebree at MISO pricing plus transmission and other costs. The power supply arrangement with Kenergy has an effective term through December 2023. The arrangement with EDF to act as our market participant with MISO has an effective term through May 2022. Each of these agreements provides for automatic extension on a year-to-year basis unless a one year notice is given.

Mt. Holly

Mt. Holly has a power supply arrangement pursuant to which 25% of the Mt. Holly load is served from the South Carolina Public Service Authority’s ("Santee Cooper") generation at a cost-based industrial rate and 75% of the Mt. Holly load is sourced from a supplier that is outside Santee Cooper’s service territory at market prices that are tied to natural gas prices. The agreement with Santee Cooper has a term through December 31, 2020. The agreement with the other power supplier has a term through December 31, 2020 and may be terminated by Mt. Holly on 60 days’ notice.

On October 20, 2020, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2020, when our current power contracts at Mt. Holly expire, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the federal Worker Adjustment and Retraining Notification Act.

Grundartangi

Grundartangi has power purchase agreements for approximately 525 MW with HS Orka hf ("HS"), Landsvirkjun and Orkuveita Reykjavikur ("OR") to provide power to its Grundartangi smelter. These power purchase agreements expire on various dates from 2023 through 2036 (subject to extension). The power purchase agreements with HS and OR both provide power at LME-based variable rates for the duration of these agreements. The power purchase agreement with Landsvirkjun for 161 MW provides power at rates linked to the Nord Pool power market.

Helguvik

Nordural Helguvik ehf ("Helguvik") has a power purchase agreement with OR to provide a portion of the power requirements to the Helguvik project. The agreement would provide power at LME-based variable rates and contain take-or-pay obligations with respect to a significant percentage of the total committed and available power under such agreement. The first phase of power under the OR purchase agreement (approximately 47.5 MW) became available in the fourth quarter of 2011 and is currently being utilized at Grundartangi. The agreement contains certain conditions to OR’s obligations with respect to the remaining phases and OR has alleged that certain of these conditions have not been satisfied.

Other Commitments and Contingencies

Labor Commitments

The bargaining unit employees at our Grundartangi, Vlissingen, Hawesville and Sebree facilities are represented by labor unions, representing approximately 66% of our total workforce. 

Approximately 86% of Grundartangi’s work force is represented by five labor unions, governed by a labor agreement that establishes wages and work rules for covered employees. This agreement is effective through December 31, 2024.

100% of Vlissingen's work force is represented by the Federation for the Metal and Electrical Industry ("FME") by a labor agreement that is effective through December 1, 2020.

Approximately 57% of our U.S. based work force is represented by USW. The labor agreement for Hawesville employees is effective through April 1, 2021. Century Sebree's labor agreement with the USW for its employees is effective through October 28, 2023. Mt. Holly employees are not represented by a labor union.

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Components of Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Components of Accumulated Other Comprehensive Loss

Components of Accumulated Other Comprehensive Loss

Components of AOCL:	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	(111.7)	$	(115.9)
Unrealized gain (loss) on financial instruments	2.2		2.3
Other comprehensive loss before income tax effect	(109.5)		(113.6)
Income tax effect (1)	3.0		3.8
Accumulated other comprehensive loss	$	(106.5)	$	(109.8)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:

	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	3.4	$	4.3
Unrealized loss on financial instruments	(0.4)		(0.4)

The following table summarizes the changes in the accumulated balances for each component of AOCL:

	Defined benefit plan and other postretirement liabilities		Unrealized gain (loss) on financial instruments		Total, net of tax
Balance, July 1, 2020	$	(109.5)	$	1.9	$	(107.6)
Net amount reclassified to net income (loss)	1.2		(0.1)		1.1
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, July 1, 2019	$	(100.7)	$	2.0	$	(98.7)
Net amount reclassified to net income	0.7		0.0		0.7
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)
Balance, December 31, 2019	$	(111.7)	$	1.9	$	(109.8)
Net amount reclassified to net loss	3.4		(0.1)		3.3
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, December 31, 2018	$	(100.7)	$	2.0	$	(98.7)
Impact of ASU 2018-02 (1)	(1.3)		—		(1.3)
Net amount reclassified to net income (loss)	2.1		(0.1)		2.0
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)

(1) ASU 2018-02. See Note 7. Income Taxes for further information regarding our adoption of ASU 2018-02.

Reclassifications out of AOCL were included in the consolidated statements of operations as follows:

		Three months ended September 30,				Nine months ended September 30,
AOCL Components	Location	2020		2019		2020		2019
Defined benefit plan and other postretirement liabilities	Cost of goods sold	$	0.8	$	0.8	$	2.3	$	1.7
	Selling, general and administrative expenses	0.1		(0.3)		0.5		(0.9)
	Other operating expense, net	0.5		0.5		1.4		2.1
	Income tax effect	(0.2)		(0.3)		(0.8)		(0.8)
	Net of tax	$	1.2	$	0.7	$	3.4	$	2.1
Unrealized loss on financial instruments	Cost of goods sold	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)
	Income tax effect	0.0		0.0		0.0		0.0
	Net of tax	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)

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Components of Net Periodic Benefit Cost

9 Months Ended

Sep. 30, 2020

Components of net periodic benefit cost [Abstract]

Components of Net Periodic Benefit Cost

Components of Net Periodic Benefit Cost

	Pension Benefits
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	1.3	$	1.0	$	3.7	$	2.5
Interest cost	2.9		3.3		8.5		10.0
Expected return on plan assets	(5.3)		(4.5)		(15.6)		(13.7)
Amortization of prior service costs	0.1		0.0		0.1		0.6
Amortization of net loss	1.6		1.6		4.9		4.9
Net periodic benefit cost	$	0.6	$	1.4	$	1.6	$	4.3

	Other Postretirement Benefits ("OPEB")
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	0.0	$	0.0	$	0.2	$	0.8
Interest cost	0.8		1.1		2.3		3.4
Amortization of prior service cost	(0.8)		(1.2)		(2.4)		(4.3)
Amortization of net loss	0.5		0.6		1.6		1.7
Net periodic benefit cost	$	0.5	$	0.5	$	1.7	$	1.6

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Derivatives

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DerivativesAs of September 30, 2020, we had an open position of 124,378 tonnes related to LME forward financial sales contracts to fix the forward LME aluminum price. These contracts are expected to settle monthly through December 2024. We also had an open position of 126,000 tonnes related to Midwest Premium ("MWP") forward financial sales contracts to fix the forward MWP price. These contracts are expected to settle through December 2021. We have also entered into LME and MWP financial

contracts with various counterparties to offset fixed price sales arrangements with certain of our customers (“fixed for floating swaps”) to remain exposed to the LME and MWP aluminum prices. As of September 30, 2020, we had an open position related to such arrangements of 13,144 tonnes that will settle at various dates through October 2021.

We have entered into financial contracts to fix the forward price for power related to the expected production of Line 4 at Hawesville for the period of January 2020 through December 2020 ("Hawesville L4 power price swaps"). As of September 30, 2020, we had an open position of 198,810 MWh. The Hawesville L4 power price swaps are expected to settle monthly through December 2020.

We have entered into financial contracts to hedge a portion of Grundartangi's exposure to the Nord Pool power market (“Nord Pool power price swaps”). As of September 30, 2020, we had an open position of 1,373,790 MWh related to the Nord Pool power price swaps. The Nord Pool power price swaps are expected to settle monthly through December 2021. Because the Nord Pool power price swaps are settled in Euros, we have entered into financial contracts to hedge the risk of fluctuations associated with the Euro ("FX swaps"). As of September 30, 2020, we had an open position related to the FX swaps of €34.6 million that will settle monthly through December 2021.

The following table sets forth the Company's derivative assets and liabilities that were accounted for at fair value and not designated as cash flow hedges as of September 30, 2020 and December 31, 2019, respectively:

	Asset Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	17.0	$	19.7
Foreign exchange contracts (2)	1.0		—
Total	$	18.0	$	19.7

	Liability Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	5.7	$	3.6
Foreign exchange contracts (2)	—		0.6
Total	$	5.7	$	4.2

(1) Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, Hawesville L4 power price swaps, fixed for floating swaps, and Nord Pool power price swaps. At September 30, 2020 and December 31, 2019, $0.1 million and $0.2 million of Due from affiliates and $1.3 million and $0.5 million of Due from affiliates - less current portion, respectively, is related to commodity contract assets with Glencore.

(2) Foreign exchange contracts reflect our outstanding FX swaps.

The following table summarizes the net (loss) gain on forward and derivative contracts:

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Commodity contracts(3)	$	(11.0)	$	10.6	$	0.8	$	11.2
Foreign exchange contracts	1.6		(0.3)		(2.7)		(0.5)
Total	$	(9.4)	$	10.3	$	(1.9)	$	10.7

(3) For the three months ended September 30, 2020 and 2019, $(4.6) million and $1.9 million of the net (loss) gain, respectively, was with Glencore. For the nine months ended September 30, 2020 and 2019, $0.1 million and $2.7 million of net (loss) gain, respectively, was with Glencore.

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Condensed Consolidating Financial Information

9 Months Ended

Sep. 30, 2020

Condensed Financial Information Disclosure [Abstract]

Condensed Consolidating Financial Information

Condensed Consolidating Financial Information

The Company has filed a Registration Statement on Form S-3 (the "Universal Shelf Registration Statement") with the Securities and Exchange Commission pursuant to which the Company may, from time to time, offer an indeterminate amount of securities, which may include securities that are guaranteed by certain of the Company's subsidiaries. The condensed consolidated financial information below is presented herein pursuant to the Universal Shelf Registration Statement. We have not issued any debt securities pursuant to the Universal Shelf Registration Statement.

"Guarantor Subsidiaries" refers to all of our material domestic subsidiaries except for Nordural US LLC, Century Aluminum Development LLC and Century Aluminum of West Virginia, Inc.  The Guarantor Subsidiaries are 100% owned by Century.  All guarantees will be full and unconditional; all guarantees will be joint and several.  Our foreign subsidiaries, together with Nordural US LLC, Century Aluminum Development LLC and Century Aluminum of West Virginia, Inc., are collectively referred to as the “Non-Guarantor Subsidiaries”.  We allocate corporate expenses or income to our subsidiaries and charge interest on certain intercompany balances.

The following summarized condensed consolidating statements of comprehensive income (loss) for the three and nine months ended September 30, 2020 and 2019, condensed consolidating balance sheets as of September 30, 2020 and December 31, 2019 and the condensed consolidating statements of cash flows for the nine months ended September 30, 2020 and 2019 present separate results for Century, the Guarantor Subsidiaries, the Non-Guarantor Subsidiaries, consolidating adjustments and total consolidated amounts. 

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	116.4	$	119.4	$	—	$	235.8
Other customers	—		125.7		31.4		—		157.1
Total net sales	—		242.1		150.8		—		392.9
Cost of goods sold	—		273.3		146.7		—		420.0
Gross profit (loss)	—		(31.2)		4.1		—		(27.1)
Selling, general and administrative expenses	10.6		—		0.4		—		11.0
Other operating (income) expense - net	—		—		(0.2)		—		(0.2)
Operating income (loss)	(10.6)		(31.2)		3.9		—		(37.9)
Interest expense - Hawesville term loan	(0.4)		—		—		—		(0.4)
Interest expense	(8.3)		(0.4)		(0.4)		—		(9.1)
Intercompany interest	8.1		2.8		(10.9)		—		—
Interest income	—		—		0.1		—		0.1
Net gain (loss) on forward and derivative contracts	(10.0)		0.4		0.2		—		(9.4)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	(0.1)		0.2		(0.1)		—		0.0
Income (loss) before income taxes and equity in earnings of joint ventures	(22.5)		(28.2)		(7.2)		—		(57.9)
Income tax benefit (expense)	0.0		—		(0.3)		—		(0.3)
Income (loss) before equity in earnings of joint ventures	(22.5)		(28.2)		(7.5)		—		(58.2)
Equity in earnings (loss) of joint ventures	(35.7)		0.8		—		34.9		—
Net income (loss)	(58.2)		(27.4)		(7.5)		34.9		(58.2)
Other comprehensive income before income tax effect	1.3		0.8		0.4		(1.2)		1.3
Income tax effect	(0.2)		—		—		—		(0.2)
Other comprehensive income	1.1		0.8		0.4		(1.2)		1.1
Total comprehensive income (loss)	$	(57.1)	$	(26.6)	$	(7.1)	$	33.7	$	(57.1)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	132.9	$	149.4	$	—	$	282.3
Other customers	—		144.2		11.5		—		155.7
Total net sales	—		277.1		160.9		—		438.0
Cost of goods sold	—		288.3		163.4		—		451.7
Gross profit (loss)	—		(11.2)		(2.5)		—		(13.7)
Selling, general and administrative expenses	11.3		—		0.3		—		11.6
Other operating (income) expense - net	—		—		(0.1)		—		(0.1)
Operating income (loss)	(11.3)		(11.2)		(2.7)		—		(25.2)
Interest expense - Hawesville term loan	(0.8)		—		—		—		(0.8)
Interest expense	(5.1)		(0.4)		(0.1)		—		(5.6)
Intercompany interest	8.8		2.6		(11.4)		—		—
Interest income	0.1		—		0.1		—		0.2
Net gain (loss) on forward and derivative contracts	10.2		0.3		(0.2)		—		10.3
Other income (expense) - net	0.1		(0.1)		(0.9)		—		(0.9)
Income (loss) before income taxes and equity in earnings of joint ventures	2.0		(8.8)		(15.2)		—		(22.0)
Income tax (expense) benefit	0.7		—		0.6		—		1.3
Income (loss) before equity in earnings of joint ventures	2.7		(8.8)		(14.6)		—		(20.7)
Equity in earnings (loss) of joint ventures	(23.4)		3.4		(0.1)		20.1		—
Net income (loss)	(20.7)		(5.4)		(14.7)		20.1		(20.7)
Other comprehensive income (loss) before income tax effect	1.0		0.8		0.5		(1.3)		1.0
Income tax effect	(0.3)		—		—		—		(0.3)
Other comprehensive income	0.7		0.8		0.5		(1.3)		0.7
Total comprehensive income (loss)	$	(20.0)	$	(4.6)	$	(14.2)	$	18.8	$	(20.0)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	420.5	$	371.9	$	—	$	792.4
Other customers	—		343.5		80.1		—		423.6
Total net sales	—		764.0		452.0		—		1,216.0
Cost of goods sold	—		820.6		430.7		—		1,251.3
Gross profit (loss)	—		(56.6)		21.3		—		(35.3)
Selling, general and administrative expenses	30.5		—		1.2		—		31.7
Other operating (income) expense - net	—		—		0.3		—		0.3
Operating income (loss)	(30.5)		(56.6)		19.8		—		(67.3)
Interest expense - Hawesville term loan	(1.6)		—		—		—		(1.6)
Interest expense	(18.8)		(1.2)		(1.0)		—		(21.0)
Intercompany interest	24.6		8.2		(32.8)		—		—
Interest income	0.3		—		0.3		—		0.6
Net gain (loss) on forward and derivative contracts	20.7		1.1		(23.7)		—		(1.9)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	—		0.9		2.1		—		3.0
Income (loss) before income taxes and equity in earnings of joint ventures	(6.5)		(47.6)		(35.3)		—		(89.4)
Income tax benefit (expense)	1.0		—		0.6		—		1.6
Income (loss) before equity in earnings of joint ventures	(5.5)		(47.6)		(34.7)		—		(87.8)
Equity in earnings (loss) of joint ventures	(82.3)		3.1		—		79.2		0.0
Net income (loss)	(87.8)		(44.5)		(34.7)		79.2		(87.8)
Other comprehensive income before income tax effect	4.1		2.3		1.3		(3.6)		4.1
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	3.3		2.3		1.3		(3.6)		3.3
Total comprehensive income (loss)	$	(84.5)	$	(42.2)	$	(33.4)	$	75.6	$	(84.5)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	432.8	$	465.9	$	—	$	898.7
Other customers	—		479.1		23.4		—		502.5
Total net sales	—		911.9		489.3		—		1,401.2
Cost of goods sold	—		921.5		510.3		—		1,431.8
Gross profit (loss)	—		(9.6)		(21.0)		—		(30.6)
Selling, general and administrative expenses	36.9		—		1.3		—		38.2
Other operating (income) expense - net	—		—		0.4		—		0.4
Operating income (loss)	(36.9)		(9.6)		(22.7)		—		(69.2)
Interest expense - Hawesville term loan	(1.3)		—		—		—		(1.3)
Interest expense	(15.9)		(1.2)		(0.2)		—		(17.3)
Intercompany interest	26.2		7.6		(33.8)		—		—
Interest income	0.2		—		0.4		—		0.6
Net gain (loss) on forward and derivative contracts	10.3		1.0		(0.6)		—		10.7
Other income (expense) - net	0.9		(2.0)		(0.5)		—		(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(16.5)		(4.2)		(57.4)		—		(78.1)
Income tax benefit (expense)	1.6		—		4.1		—		5.7
Income (loss) before equity in earnings of joint ventures	(14.9)		(4.2)		(53.3)		—		(72.4)
Loss on sale of BHH	—		—		(4.3)		—		(4.3)
Equity in earnings (loss) of joint ventures	(61.1)		3.1		0.7		58.0		0.7
Net income (loss)	(76.0)		(1.1)		(56.9)		58.0		(76.0)
Other comprehensive income before income tax effect	2.8		1.6		2.0		(3.6)		2.8
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	2.0		1.6		2.0		(3.6)		2.0
Total comprehensive income (loss)	$	(74.0)	$	0.5	$	(54.9)	$	54.4	$	(74.0)

Condensed Consolidating Balance Sheets
As of September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	3.1	$	0.2	$	78.1	$	—	$	81.4
Restricted cash	—		1.8		1.9		—		3.7
Accounts receivable - net	1.7		46.8		2.1		—		50.6
Due from affiliates	—		4.5		10.5		—		15.0
Inventories	—		178.3		89.2		—		267.5
Derivative Assets	9.8		—		0.8		—		10.6
Prepaid and other current assets	4.1		1.9		8.5		—		14.5
Total current assets	18.7		233.5		191.1		—		443.3
Property, plant and equipment - net	14.8		319.8		565.1		—		899.7
Investment in subsidiaries	533.8		65.9		—		(599.7)		—
Due from affiliates - less current portion	768.7		584.5		3.4		(1,355.3)		1.3
Other assets	38.0		4.2		18.9		—		61.1
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4
Accounts payable, trade	$	3.2	$	59.4	$	23.0	$	—	$	85.6
Due to affiliates	1.6		1.3		—		—		2.9
Accrued and other current liabilities	23.8		22.3		23.4		—		69.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan - current	20.0		—		—		—		20.0
U.S revolving credit facility	5.0		—		—		—		5.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	55.5		98.5		47.2		—		201.2
Senior notes payable	242.8		—		—		—		242.8
Hawesville term loan - less current portion	5.0		—		—		—		5.0
Iceland revolving credit facility	—		—		45.0		—		45.0
Accrued pension benefits costs - less current portion	23.9		25.4		6.7		—		56.0
Accrued postretirement benefits costs - less current portion	1.0		96.0		1.8		—		98.8
Due to affiliates - long term	439.8		352.1		563.4		(1,355.3)		—
Other liabilities	7.5		24.4		14.3		—		46.2
Leases - right of use liabilities	6.1		0.0		17.3		—		23.4
Deferred taxes	—		0.4		94.2		—		94.6
Total noncurrent liabilities	726.1		498.3		742.7		(1,355.3)		611.8
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		—		—		—		1.0
Other shareholders' equity	591.4		611.1		(11.4)		(599.7)		591.4
Total shareholders' equity	592.4		611.1		(11.4)		(599.7)		592.4
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4

Condensed Consolidating Balance Sheets
As of December 31, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	0.3	$	0.1	$	38.5	$	—	$	38.9
Restricted cash	—		0.8		—		—		0.8
Accounts receivable - net	0.7		64.1		5.3		—		70.1
Due from affiliates	—		10.9		19.2		—		30.1
Inventories	—		205.5		115.1		—		320.6
Derivative Assets	12.2		—		2.4		—		14.6
Prepaid and other current assets	3.0		2.8		6.4		—		12.2
Total current assets	16.2		284.2		186.9		—		487.3
Property, plant and equipment - net	17.2		334.8		597.2		—		949.2
Investment in subsidiaries	609.5		62.7		—		(672.2)		—
Due from affiliates - long term	749.5		537.9		5.1		(1,292.0)		0.5
Other assets	38.1		5.7		18.9		—		62.7
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7
Accounts payable, trade	$	2.3	$	66.2	$	28.6	$	—	$	97.1
Due to affiliates	—		2.2		30.7		—		32.9
Accrued and other current liabilities	23.5		27.3		14.7		—		65.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan	20.0		—		—		—		20.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	47.7		111.2		74.8		—		233.7
Senior notes payable	249.2		—		—		—		249.2
Hawesville term loan - less current portion	20.0		—		—		—		20.0
Accrued pension benefits costs - less current portion	25.1		27.3		8.4		—		60.8
Accrued postretirement benefits costs - less current portion	1.1		97.8		1.8		—		100.7
Leases - right of use liabilities	5.5		0.4		16.9		—		22.8
Other liabilities	3.5		22.2		16.7		—		42.4
Due to affiliates - long term	403.4		315.9		572.7		(1,292.0)		—
Deferred taxes	—		0.4		94.7		—		95.1
Total noncurrent liabilities	707.8		464.0		711.2		(1,292.0)		591.0
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		0.0		0.1		(0.1)		1.0
Other shareholders' equity	674.0		650.1		22.0		(672.1)		674.0
Total shareholders' equity	675.0		650.1		22.1		(672.2)		675.0
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(26.1)	$	21.3	$	38.1	$	—	$	33.3
Purchase of property, plant and equipment	(0.8)		(9.3)		(1.4)		—		(11.5)
Proceeds from sale of property, plant, and equipment	—		—		0.1		—		0.1
Intercompany transactions	14.9		(38.3)		1.8		21.6		—
Net cash provided by (used in) investing activities	14.1		(47.6)		0.5		21.6		(11.4)
Repayment of debt	(250.0)		—		—		—		(250.0)
Proceeds from issuance of debt	243.8		—		—		—		243.8
Repayments on Hawesville term loan	(15.0)		—		—		—		(15.0)
Borrowings under revolving credit facilities	128.6		—		45.0		—		173.6
Repayments under revolving credit facilities	(127.6)		—		—		—		(127.6)
Debt issuance costs	(1.1)		—		—		—		(1.1)
Debt retirement costs	(0.2)		—		—		—		(0.2)
Intercompany transactions	36.3		27.4		(42.1)		(21.6)		—
Net cash provided by (used in) financing activities	14.8		27.4		2.9		(21.6)		23.5
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2.8		1.1		41.5		—		45.4
Cash, cash equivalents and restricted cash, beginning of period	0.3		0.9		38.5		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	3.1	$	2.0	$	80.0	$	—	$	85.1

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(57.1)	$	45.0	$	7.7	$	—	$	(4.4)
Purchase of property, plant and equipment	(0.6)		(26.4)		(12.9)		—		(39.9)
Proceeds from sale of joint venture	—		—		10.5		—		10.5
Intercompany transactions	(9.3)		(52.6)		2.0		59.9		—
Net cash provided by (used in) investing activities	(9.9)		(79.0)		(0.4)		59.9		(29.4)
Borrowing under Hawesville term loan	40.0		—		—		—		40.0
Borrowings under revolving credit facilities	295.1		—		19.5		—		314.6
Repayments under revolving credit facilities	(318.0)		—		(19.5)		—		(337.5)
Other short term borrowings	3.4		—		—		—		3.4
Repayment on other short term borrowings	(3.4)		—		—		—		(3.4)
Issuance of common stock	0.3		—		—		—		0.3
Intercompany transactions	51.0		34.0		(25.1)		(59.9)		—
Net cash provided by (used in) financing activities	68.4		34.0		(25.1)		(59.9)		17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	1.4		—		(17.8)		—		(16.4)
Cash, cash equivalents and restricted cash, beginning of period	0.1		0.8		38.8		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	1.5	$	0.8	$	21.0	$	—	$	23.3

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Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsA new five-year labor agreement for our Grundartangi aluminum smelter was ratified by the employees on October 22, 2020. The agreement is retroactive to January 1, 2020 and continues through December 31, 2024.On October 20, 2020, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2020 when our current power contracts at Mt. Holly expire, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the Worker Adjustment and Retraining Notification Act.

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General (Policies)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes." Amendments include the removal of certain exceptions to the general principles of ASC 740 and to improve and simplify accounting for income taxes by clarifying and amending existing guidance. Updates are related to intraperiod tax allocation, interim period tax calculations, tax laws or rate changes in interim periods, and income taxes related to employee stock ownership plans. The ASU is effective for fiscal years beginning after December 15, 2020, including interim periods therein and early adoption is permitted. The Company is currently evaluating the impacts of ASU 2019-12 and we do not expect the adoption to have a material effect on the consolidated financial statements.

In March 2020, the Securities and Exchange Commission (“SEC”) issued a final rule that amends the disclosure requirements related issuers and guarantors of certain registered securities under SEC Regulation S-X Rule 3-10. The final rule allows registrants to provide alternative financial disclosures in either the registrant’s MD&A or financial statements, rather than the previous requirement under Rule 3-10, which required condensed consolidating financial information within the financial statements. It also simplifies the requirements in Rule 3-10 that currently must be met for a parent company to qualify for exceptions allowing it to provide alternative disclosures rather than full audited financial statements. The ruling also reduces the periods for which summarized financial information is required to be presented to the most recent (1) annual period and (2) year-to-date interim period. The final rule applies to annual reports on Form 10-K for fiscal years ending after January 4, 2021 and quarterly reports on Form 10-Q for quarterly periods ending after January 4, 2021 and registrants may voluntarily comply with the final rule before the effective date. The Company does not expect the future adoption, which is limited to disclosures only, to have a material effect on the Company’s consolidated financial statements.

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2020

Related Party Transactions [Abstract]

Schedule of related party transactions

A summary of the aforementioned significant related party transactions is as follows: 

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Net sales to Glencore	$	235.8	$	282.3	$	792.4	$	898.7
Purchases from Glencore	63.7		43.6		137.3		249.8
Purchases from BHH (1)	—		2.2		—		16.8

(1) We previously owned a 40% interest in Baise Haohai Carbon Co. Ltd. ("BHH") and purchased carbon anodes from them for use in our operations. Purchases represented herein were prior to the divestiture of our interest in BHH in May 2019.

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Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of revenue

We disaggregate our revenue by geographical region as follows:

Net Sales	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
United States	$	242.0	$	277.1	$	764.0	$	911.9
Iceland	150.9		160.9		452.0		489.3
Total	$	392.9	$	438.0	$	1,216.0	$	1,401.2

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Financial assets and liabilities at fair value on a recurring basis

Recurring Fair Value Measurements	As of September 30, 2020
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	71.2	$	—	$	—	$	71.2
Trust assets (1)	0.2		—		—		0.2
Derivative instruments	—		11.4		6.6		18.0
TOTAL	$	71.4	$	11.4	$	6.6	$	89.4
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		4.9		0.8		5.7
TOTAL	$	—	$	4.9	$	0.8	$	5.7

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

Recurring Fair Value Measurements	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash equivalents	$	23.3	$	—	$	—	$	23.3
Trust assets (1)	0.2		—		—		0.2
Surety bonds (2)	1.8		—		—		1.8
Derivative instruments	—		9.1		10.6		19.7
TOTAL	$	25.3	$	9.1	$	10.6	$	45.0
LIABILITIES:
Contingent obligation – net	$	—	$	—	$	—	$	—
Derivative instruments	—		1.3		2.9		4.2
TOTAL	$	—	$	1.3	$	2.9	$	4.2

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.(2) Surety bonds were invested in U.S. treasury bills and represent collateral against our workers' compensation insurance policy.

Schedule of valuation methodology for assets and liabilities at fair value

We use the following valuation techniques and inputs for fair value measurements categorized within Level 2 of the fair value hierarchy:

Level 2 Fair Value Measurements:
Asset / Liability	Level	Valuation Techniques	Inputs
LME forward financial sales contracts	2	Discounted cash flows	Quoted LME forward market
MWP forward financial sales contracts	2	Discounted cash flows	Quoted MWP forward market
Fixed for floating swaps	2	Discounted cash flows	Quoted LME forward market, quoted MWP forward market
Nord Pool power price swaps	2	Discounted cash flows	Quoted Nord Pool forward market
MISO Indiana Hub power price swaps	2	Discounted cash flows	Quoted Indy Hub forward market
FX swaps	2	Discounted cash flows	Euro/USD forward exchange rate

When valuing Level 3 assets and liabilities, we use certain significant unobservable inputs. Management incorporates various inputs and assumptions including forward commodity prices, commodity price volatility, and macroeconomic conditions, including interest rates and discount rates. Our estimates of significant unobservable inputs are ultimately based on our estimates of risks that market participants would consider when valuing our assets and liabilities.

The following table presents the inputs for fair value measurements categorized within Level 3 of the fair value hierarchy, along with information regarding significant unobservable inputs used to value Level 3 assets and liabilities:

Level 3 Fair Value Measurements:
Asset / Liability	Fair Value at September 30, 2020		Valuation Technique	Observable Inputs	Significant Unobservable Input	Value/Range of Unobservable Input
LME forward financial sales contracts	$	6.6	Discounted cash flows	Quoted LME forward market prices	Discount rate (1)	10.00%
Contingent obligation	$	—	Discounted cash flows	Quoted LME forward market prices	Management's estimates of the LME forward market price beyond the quoted periods (2)	$1,754/T-$2,312/T
Hawesville L4 power price swaps	$	(0.8)	Discounted cash flows	Quoted Indy Hub forward market prices	Estimates of locational margin prices during contract term in megawatt hours (MWh) (3)	$0.45/MWh

(1) Represents risk adjusted discount rate.

(2) Represents the range of estimated forward LME prices of primary aluminum through the term of the agreement in December 2028.

(3) Represents historical average of locational margin prices from January 2017-September 2020

Schedule of fair value reconciliation of Level 3 assets and liabilities measured at fair value

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis.

	Level 3 Assets		Level 3 Liabilities
For the three months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of July 1, 2020	$	6.1	$	(1.5)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	(4.2)		(0.2)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		0.9
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3	—		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	(4.2)	$	0.7

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

For the three months ended September 30, 2019	Level 3 Assets		Level 3 Liabilities
	U.S. LME forward financial sales contracts		Hawesville L4 Power Price Swaps
Balance as of July 1, 2019	$	6.9	$	(2.7)
Total realized/unrealized gains (losses)
Included in Net Income (1)	8.8		1.2
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		—
Transfers into Level 3	—		—
Transfers out of Level 3	—		—
Balance as of September 30, 2019	$	15.7	$	(1.5)
Change in unrealized gains (losses) (1)	$	8.8	$	1.2

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

	Level 3 Assets		Level 3 Liabilities
For the nine months ended September 30, 2020	LME forward financial sales contracts		Hawesville L4 power price swaps
Balance as of January 1, 2020	$	10.6	$	(2.9)
Total realized/unrealized gains (losses)
Included in net income (loss) (1)	0.8		(1.6)
Purchases, sales, settlements
Purchases	—		—
Sales	—		—
Settlements	—		3.7
Transfers into Level 3 (2)	4.7		—
Transfers out of Level 3 (3)	(9.5)		—
Balance as of September 30, 2020	$	6.6	$	(0.8)
Change in unrealized gains (losses) (1)	$	0.8	$	2.1

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfers into Level 3 due to contracts with applied discount rate during the third quarter of 2020.

(3) Transfer out of Level 3 due to period of time remaining in derivative contract.

For the nine months ended September 30, 2019	Level 3 Assets				Level 3 Liabilities
	Nord Pool power price swaps		US LME forward financial sales contracts		Hawesville L4 Power Price Swaps		Iceland LME forward financial sales contracts		FX Swaps
Balance as of January 1, 2019	$	4.7	$	0.3	$	—	$	(0.2)	$	(0.3)
Total realized/unrealized gains (losses)
Included in Net Income (1)	(1.0)		15.6		1.2		(0.1)		(0.3)
Purchases, sales, settlements
Purchases	—		—		—		—		—
Sales	—		—		—		—		—
Settlements	—		—		—		—		—
Transfers into Level 3 (2)	—		(0.2)		(2.7)		—		—
Transfers out of Level 3	(3.7)		—		—		0.3		0.6
Balance as of September 30, 2019	$	—	$	15.7	$	(1.5)	$	—	$	—
Change in unrealized gains (losses) (1)	$	(1.0)	$	15.4	$	(1.5)	$	(0.1)	$	(0.3)

(1) Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

(2) Transfer into Level 3 resulting from derivative contracts entered into during the first nine months of 2019.

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Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Basic and diluted earnings (loss) per share

The following table shows the basic and diluted earnings (loss) per share:

	For the three months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(58.2)					$	(20.7)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(58.2)		89.5	$	(0.65)	$	(20.7)		88.9	$	(0.23)

	For the nine months ended September 30,
	2020						2019
	Net Income (Loss)			Shares (in millions)	Per Share		Net Income (Loss)			Shares (in millions)	Per Share
Net income (loss)	$	(87.8)					$	(76.0)
Amount allocated to common stockholders	100.0		%				100.0		%
Basic and diluted EPS(1)	$	(87.8)		89.4	$	(0.98)	$	(76.0)		88.6	$	(0.86)

(1) In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their anti-dilutive effect on earnings (loss) per share.

Securities excluded from the calculation of diluted EPS

	Three months ended September 30,		Nine months ended September 30,
Securities excluded from the calculation of diluted EPS (in millions)(1):	2020	2019	2020	2019
Share-based compensation	1.7	0.7	1.2	0.6

(1) In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their anti-dilutive effect on earnings (loss) per share.

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Shareholders’ Equity (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders' Equity Note [Abstract]

Common and Preferred Stock Activity

The Common and Preferred Stock table below contains additional information about preferred stock conversions during the nine months ended September 30, 2020 and 2019.

	Preferred stock	Common stock
Common and Preferred Stock Activity (in shares):	Series A Convertible	Treasury	Outstanding
Beginning balance as of December 31, 2019	67,323	7,186,521	89,185,661
Conversion of convertible preferred stock	(1,284)	—	128,389
Issuance for share-based compensation plans	—	—	170,784
Ending balance as of September 30, 2020	66,039	7,186,521	89,484,834
Beginning balance as of December 31, 2018	71,967	7,186,521	88,103,440
Conversion of convertible preferred stock	(3,392)	—	339,166
Issuance for share-based compensation plans	—	—	451,161
Ending balance as of September 30, 2019	68,575	7,186,521	88,893,767

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Inventories (Tables)

9 Months Ended

Sep. 30, 2020

Inventory, Net [Abstract]

Schedule of Inventories

Inventories consist of the following:

	September 30, 2020		December 31, 2019
Raw materials	$	75.2	$	101.3
Work-in-process	41.3		44.1
Finished goods	18.4		34.3
Operating and other supplies	132.6		140.9
Total inventories	$	267.5	$	320.6

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Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt

	September 30, 2020		December 31, 2019
Debt classified as current liabilities:
Hawesville Term Loan - current portion(1)	$	20.0	$	20.0
Hancock County industrial revenue bonds ("IRBs") due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (2)	7.8		7.8
U.S. Revolving Credit Facility(3)	5.0		4.0
Debt classified as non-current liabilities:
Iceland Revolving Credit Facility (4)	45.0		—
7.5% senior secured notes due June 2021, net of debt discount of $0.8 million at December 31, 2019	—		249.2
12.0% senior secured notes due June 2025, net of debt discount of $2.4 million and financing fees of $4.8 million at September 30, 2020, interest payable semiannually	242.8		—
Hawesville Term Loan - less current portion(1), principal and interest payable monthly	5.0		20.0
Total	$	325.6	$	301.0

(1) See "Hawesville Term Loan" below. At September 30, 2020, the applicable interest rate was LIBOR of 0.3% plus margin of 5.375% and there is no interest payable outstanding. As of September 30, 2020, we have made $15.0 million of principal payments and $1.6 million of interest payments.

(2) The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at September 30, 2020 was 0.34%.

(3) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 4.0%.

(4) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2020 was 3.2%.

Schedule of Debt Redemption Rights

Prior to July 1, 2021, we may redeem the 2025 Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and if redeemed during the twelve-month period beginning on July 1 of the years indicated below, at the following redemption prices plus accrued and unpaid interest:

Year	Percentage
2021	105.0%
2022	102.5%
2023	101.25%
2024	100.0%

Schedule of Line of Credit Facilities

Status of our U.S. revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	175.0
Borrowing availability	124.6
Outstanding letters of credit issued	36.6
Outstanding borrowings	5.0
Borrowing availability, net of outstanding letters of credit and borrowings	83.0

Status of our Iceland revolving credit facility:	September 30, 2020
Credit facility maximum amount	$	50.0
Borrowing availability	50.0
Outstanding letters of credit issued	—
Outstanding borrowings	45.0
Borrowing availability, net of borrowings	5.0

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Components of Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated balances for each component of AOCI

Components of AOCL:	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	(111.7)	$	(115.9)
Unrealized gain (loss) on financial instruments	2.2		2.3
Other comprehensive loss before income tax effect	(109.5)		(113.6)
Income tax effect (1)	3.0		3.8
Accumulated other comprehensive loss	$	(106.5)	$	(109.8)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:

	September 30, 2020		December 31, 2019
Defined benefit plan liabilities	$	3.4	$	4.3
Unrealized loss on financial instruments	(0.4)		(0.4)

The following table summarizes the changes in the accumulated balances for each component of AOCL:

	Defined benefit plan and other postretirement liabilities		Unrealized gain (loss) on financial instruments		Total, net of tax
Balance, July 1, 2020	$	(109.5)	$	1.9	$	(107.6)
Net amount reclassified to net income (loss)	1.2		(0.1)		1.1
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, July 1, 2019	$	(100.7)	$	2.0	$	(98.7)
Net amount reclassified to net income	0.7		0.0		0.7
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)
Balance, December 31, 2019	$	(111.7)	$	1.9	$	(109.8)
Net amount reclassified to net loss	3.4		(0.1)		3.3
Balance, September 30, 2020	$	(108.3)	$	1.8	$	(106.5)
Balance, December 31, 2018	$	(100.7)	$	2.0	$	(98.7)
Impact of ASU 2018-02 (1)	(1.3)		—		(1.3)
Net amount reclassified to net income (loss)	2.1		(0.1)		2.0
Balance, September 30, 2019	$	(100.0)	$	2.0	$	(98.0)

(1) ASU 2018-02. See Note 7. Income Taxes for further information regarding our adoption of ASU 2018-02.

Reclassification out of AOCI

Reclassifications out of AOCL were included in the consolidated statements of operations as follows:

		Three months ended September 30,				Nine months ended September 30,
AOCL Components	Location	2020		2019		2020		2019
Defined benefit plan and other postretirement liabilities	Cost of goods sold	$	0.8	$	0.8	$	2.3	$	1.7
	Selling, general and administrative expenses	0.1		(0.3)		0.5		(0.9)
	Other operating expense, net	0.5		0.5		1.4		2.1
	Income tax effect	(0.2)		(0.3)		(0.8)		(0.8)
	Net of tax	$	1.2	$	0.7	$	3.4	$	2.1
Unrealized loss on financial instruments	Cost of goods sold	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)
	Income tax effect	0.0		0.0		0.0		0.0
	Net of tax	$	(0.1)	$	0.0	$	(0.1)	$	(0.1)

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Components of Net Periodic Benefit Cost (Tables)

9 Months Ended

Sep. 30, 2020

Components of net periodic benefit cost [Abstract]

Schedule of net periodic benefit cost

	Pension Benefits
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	1.3	$	1.0	$	3.7	$	2.5
Interest cost	2.9		3.3		8.5		10.0
Expected return on plan assets	(5.3)		(4.5)		(15.6)		(13.7)
Amortization of prior service costs	0.1		0.0		0.1		0.6
Amortization of net loss	1.6		1.6		4.9		4.9
Net periodic benefit cost	$	0.6	$	1.4	$	1.6	$	4.3

	Other Postretirement Benefits ("OPEB")
	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	0.0	$	0.0	$	0.2	$	0.8
Interest cost	0.8		1.1		2.3		3.4
Amortization of prior service cost	(0.8)		(1.2)		(2.4)		(4.3)
Amortization of net loss	0.5		0.6		1.6		1.7
Net periodic benefit cost	$	0.5	$	0.5	$	1.7	$	1.6

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Derivatives (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives Not Designated as Hedging Instruments

The following table sets forth the Company's derivative assets and liabilities that were accounted for at fair value and not designated as cash flow hedges as of September 30, 2020 and December 31, 2019, respectively:

	Asset Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	17.0	$	19.7
Foreign exchange contracts (2)	1.0		—
Total	$	18.0	$	19.7

	Liability Fair Value
	September 30, 2020		December 31, 2019
Commodity contracts (1)	$	5.7	$	3.6
Foreign exchange contracts (2)	—		0.6
Total	$	5.7	$	4.2

(1) Commodity contracts reflect our outstanding LME forward financial sales contracts, MWP forward financial sales contracts, Hawesville L4 power price swaps, fixed for floating swaps, and Nord Pool power price swaps. At September 30, 2020 and December 31, 2019, $0.1 million and $0.2 million of Due from affiliates and $1.3 million and $0.5 million of Due from affiliates - less current portion, respectively, is related to commodity contract assets with Glencore.

(2) Foreign exchange contracts reflect our outstanding FX swaps.

Schedule of Derivative Instruments

The following table summarizes the net (loss) gain on forward and derivative contracts:

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Commodity contracts(3)	$	(11.0)	$	10.6	$	0.8	$	11.2
Foreign exchange contracts	1.6		(0.3)		(2.7)		(0.5)
Total	$	(9.4)	$	10.3	$	(1.9)	$	10.7

(3) For the three months ended September 30, 2020 and 2019, $(4.6) million and $1.9 million of the net (loss) gain, respectively, was with Glencore. For the nine months ended September 30, 2020 and 2019, $0.1 million and $2.7 million of net (loss) gain, respectively, was with Glencore.

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Condensed Consolidating Financial Information (Tables)

9 Months Ended

Sep. 30, 2020

Condensed Financial Information Disclosure [Abstract]

Condensed Consolidating Statements of Comprehensive Income (Loss)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	116.4	$	119.4	$	—	$	235.8
Other customers	—		125.7		31.4		—		157.1
Total net sales	—		242.1		150.8		—		392.9
Cost of goods sold	—		273.3		146.7		—		420.0
Gross profit (loss)	—		(31.2)		4.1		—		(27.1)
Selling, general and administrative expenses	10.6		—		0.4		—		11.0
Other operating (income) expense - net	—		—		(0.2)		—		(0.2)
Operating income (loss)	(10.6)		(31.2)		3.9		—		(37.9)
Interest expense - Hawesville term loan	(0.4)		—		—		—		(0.4)
Interest expense	(8.3)		(0.4)		(0.4)		—		(9.1)
Intercompany interest	8.1		2.8		(10.9)		—		—
Interest income	—		—		0.1		—		0.1
Net gain (loss) on forward and derivative contracts	(10.0)		0.4		0.2		—		(9.4)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	(0.1)		0.2		(0.1)		—		0.0
Income (loss) before income taxes and equity in earnings of joint ventures	(22.5)		(28.2)		(7.2)		—		(57.9)
Income tax benefit (expense)	0.0		—		(0.3)		—		(0.3)
Income (loss) before equity in earnings of joint ventures	(22.5)		(28.2)		(7.5)		—		(58.2)
Equity in earnings (loss) of joint ventures	(35.7)		0.8		—		34.9		—
Net income (loss)	(58.2)		(27.4)		(7.5)		34.9		(58.2)
Other comprehensive income before income tax effect	1.3		0.8		0.4		(1.2)		1.3
Income tax effect	(0.2)		—		—		—		(0.2)
Other comprehensive income	1.1		0.8		0.4		(1.2)		1.1
Total comprehensive income (loss)	$	(57.1)	$	(26.6)	$	(7.1)	$	33.7	$	(57.1)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the three months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	132.9	$	149.4	$	—	$	282.3
Other customers	—		144.2		11.5		—		155.7
Total net sales	—		277.1		160.9		—		438.0
Cost of goods sold	—		288.3		163.4		—		451.7
Gross profit (loss)	—		(11.2)		(2.5)		—		(13.7)
Selling, general and administrative expenses	11.3		—		0.3		—		11.6
Other operating (income) expense - net	—		—		(0.1)		—		(0.1)
Operating income (loss)	(11.3)		(11.2)		(2.7)		—		(25.2)
Interest expense - Hawesville term loan	(0.8)		—		—		—		(0.8)
Interest expense	(5.1)		(0.4)		(0.1)		—		(5.6)
Intercompany interest	8.8		2.6		(11.4)		—		—
Interest income	0.1		—		0.1		—		0.2
Net gain (loss) on forward and derivative contracts	10.2		0.3		(0.2)		—		10.3
Other income (expense) - net	0.1		(0.1)		(0.9)		—		(0.9)
Income (loss) before income taxes and equity in earnings of joint ventures	2.0		(8.8)		(15.2)		—		(22.0)
Income tax (expense) benefit	0.7		—		0.6		—		1.3
Income (loss) before equity in earnings of joint ventures	2.7		(8.8)		(14.6)		—		(20.7)
Equity in earnings (loss) of joint ventures	(23.4)		3.4		(0.1)		20.1		—
Net income (loss)	(20.7)		(5.4)		(14.7)		20.1		(20.7)
Other comprehensive income (loss) before income tax effect	1.0		0.8		0.5		(1.3)		1.0
Income tax effect	(0.3)		—		—		—		(0.3)
Other comprehensive income	0.7		0.8		0.5		(1.3)		0.7
Total comprehensive income (loss)	$	(20.0)	$	(4.6)	$	(14.2)	$	18.8	$	(20.0)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	420.5	$	371.9	$	—	$	792.4
Other customers	—		343.5		80.1		—		423.6
Total net sales	—		764.0		452.0		—		1,216.0
Cost of goods sold	—		820.6		430.7		—		1,251.3
Gross profit (loss)	—		(56.6)		21.3		—		(35.3)
Selling, general and administrative expenses	30.5		—		1.2		—		31.7
Other operating (income) expense - net	—		—		0.3		—		0.3
Operating income (loss)	(30.5)		(56.6)		19.8		—		(67.3)
Interest expense - Hawesville term loan	(1.6)		—		—		—		(1.6)
Interest expense	(18.8)		(1.2)		(1.0)		—		(21.0)
Intercompany interest	24.6		8.2		(32.8)		—		—
Interest income	0.3		—		0.3		—		0.6
Net gain (loss) on forward and derivative contracts	20.7		1.1		(23.7)		—		(1.9)
Loss on early extinguishment of debt	(1.2)		—		—		—		(1.2)
Other income (expense) - net	—		0.9		2.1		—		3.0
Income (loss) before income taxes and equity in earnings of joint ventures	(6.5)		(47.6)		(35.3)		—		(89.4)
Income tax benefit (expense)	1.0		—		0.6		—		1.6
Income (loss) before equity in earnings of joint ventures	(5.5)		(47.6)		(34.7)		—		(87.8)
Equity in earnings (loss) of joint ventures	(82.3)		3.1		—		79.2		0.0
Net income (loss)	(87.8)		(44.5)		(34.7)		79.2		(87.8)
Other comprehensive income before income tax effect	4.1		2.3		1.3		(3.6)		4.1
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	3.3		2.3		1.3		(3.6)		3.3
Total comprehensive income (loss)	$	(84.5)	$	(42.2)	$	(33.4)	$	75.6	$	(84.5)

Condensed Consolidating Statements of Comprehensive Income (Loss)
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
NET SALES:
Related parties	$	—	$	432.8	$	465.9	$	—	$	898.7
Other customers	—		479.1		23.4		—		502.5
Total net sales	—		911.9		489.3		—		1,401.2
Cost of goods sold	—		921.5		510.3		—		1,431.8
Gross profit (loss)	—		(9.6)		(21.0)		—		(30.6)
Selling, general and administrative expenses	36.9		—		1.3		—		38.2
Other operating (income) expense - net	—		—		0.4		—		0.4
Operating income (loss)	(36.9)		(9.6)		(22.7)		—		(69.2)
Interest expense - Hawesville term loan	(1.3)		—		—		—		(1.3)
Interest expense	(15.9)		(1.2)		(0.2)		—		(17.3)
Intercompany interest	26.2		7.6		(33.8)		—		—
Interest income	0.2		—		0.4		—		0.6
Net gain (loss) on forward and derivative contracts	10.3		1.0		(0.6)		—		10.7
Other income (expense) - net	0.9		(2.0)		(0.5)		—		(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(16.5)		(4.2)		(57.4)		—		(78.1)
Income tax benefit (expense)	1.6		—		4.1		—		5.7
Income (loss) before equity in earnings of joint ventures	(14.9)		(4.2)		(53.3)		—		(72.4)
Loss on sale of BHH	—		—		(4.3)		—		(4.3)
Equity in earnings (loss) of joint ventures	(61.1)		3.1		0.7		58.0		0.7
Net income (loss)	(76.0)		(1.1)		(56.9)		58.0		(76.0)
Other comprehensive income before income tax effect	2.8		1.6		2.0		(3.6)		2.8
Income tax effect	(0.8)		—		—		—		(0.8)
Other comprehensive income	2.0		1.6		2.0		(3.6)		2.0
Total comprehensive income (loss)	$	(74.0)	$	0.5	$	(54.9)	$	54.4	$	(74.0)

Condensed Consolidating Balance Sheets

Condensed Consolidating Balance Sheets
As of September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	3.1	$	0.2	$	78.1	$	—	$	81.4
Restricted cash	—		1.8		1.9		—		3.7
Accounts receivable - net	1.7		46.8		2.1		—		50.6
Due from affiliates	—		4.5		10.5		—		15.0
Inventories	—		178.3		89.2		—		267.5
Derivative Assets	9.8		—		0.8		—		10.6
Prepaid and other current assets	4.1		1.9		8.5		—		14.5
Total current assets	18.7		233.5		191.1		—		443.3
Property, plant and equipment - net	14.8		319.8		565.1		—		899.7
Investment in subsidiaries	533.8		65.9		—		(599.7)		—
Due from affiliates - less current portion	768.7		584.5		3.4		(1,355.3)		1.3
Other assets	38.0		4.2		18.9		—		61.1
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4
Accounts payable, trade	$	3.2	$	59.4	$	23.0	$	—	$	85.6
Due to affiliates	1.6		1.3		—		—		2.9
Accrued and other current liabilities	23.8		22.3		23.4		—		69.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan - current	20.0		—		—		—		20.0
U.S revolving credit facility	5.0		—		—		—		5.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	55.5		98.5		47.2		—		201.2
Senior notes payable	242.8		—		—		—		242.8
Hawesville term loan - less current portion	5.0		—		—		—		5.0
Iceland revolving credit facility	—		—		45.0		—		45.0
Accrued pension benefits costs - less current portion	23.9		25.4		6.7		—		56.0
Accrued postretirement benefits costs - less current portion	1.0		96.0		1.8		—		98.8
Due to affiliates - long term	439.8		352.1		563.4		(1,355.3)		—
Other liabilities	7.5		24.4		14.3		—		46.2
Leases - right of use liabilities	6.1		0.0		17.3		—		23.4
Deferred taxes	—		0.4		94.2		—		94.6
Total noncurrent liabilities	726.1		498.3		742.7		(1,355.3)		611.8
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		—		—		—		1.0
Other shareholders' equity	591.4		611.1		(11.4)		(599.7)		591.4
Total shareholders' equity	592.4		611.1		(11.4)		(599.7)		592.4
TOTAL	$	1,374.0	$	1,207.9	$	778.5	$	(1,955.0)	$	1,405.4

Condensed Consolidating Balance Sheets
As of December 31, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Cash & cash equivalents	$	0.3	$	0.1	$	38.5	$	—	$	38.9
Restricted cash	—		0.8		—		—		0.8
Accounts receivable - net	0.7		64.1		5.3		—		70.1
Due from affiliates	—		10.9		19.2		—		30.1
Inventories	—		205.5		115.1		—		320.6
Derivative Assets	12.2		—		2.4		—		14.6
Prepaid and other current assets	3.0		2.8		6.4		—		12.2
Total current assets	16.2		284.2		186.9		—		487.3
Property, plant and equipment - net	17.2		334.8		597.2		—		949.2
Investment in subsidiaries	609.5		62.7		—		(672.2)		—
Due from affiliates - long term	749.5		537.9		5.1		(1,292.0)		0.5
Other assets	38.1		5.7		18.9		—		62.7
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7
Accounts payable, trade	$	2.3	$	66.2	$	28.6	$	—	$	97.1
Due to affiliates	—		2.2		30.7		—		32.9
Accrued and other current liabilities	23.5		27.3		14.7		—		65.5
Accrued employee benefits costs	1.9		7.7		0.8		—		10.4
Hawesville term loan	20.0		—		—		—		20.0
Industrial revenue bonds	—		7.8		—		—		7.8
Total current liabilities	47.7		111.2		74.8		—		233.7
Senior notes payable	249.2		—		—		—		249.2
Hawesville term loan - less current portion	20.0		—		—		—		20.0
Accrued pension benefits costs - less current portion	25.1		27.3		8.4		—		60.8
Accrued postretirement benefits costs - less current portion	1.1		97.8		1.8		—		100.7
Leases - right of use liabilities	5.5		0.4		16.9		—		22.8
Other liabilities	3.5		22.2		16.7		—		42.4
Due to affiliates - long term	403.4		315.9		572.7		(1,292.0)		—
Deferred taxes	—		0.4		94.7		—		95.1
Total noncurrent liabilities	707.8		464.0		711.2		(1,292.0)		591.0
Preferred stock	0.0		—		—		—		0.0
Common stock	1.0		0.0		0.1		(0.1)		1.0
Other shareholders' equity	674.0		650.1		22.0		(672.1)		674.0
Total shareholders' equity	675.0		650.1		22.1		(672.2)		675.0
TOTAL	$	1,430.5	$	1,225.3	$	808.1	$	(1,964.2)	$	1,499.7

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2020
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(26.1)	$	21.3	$	38.1	$	—	$	33.3
Purchase of property, plant and equipment	(0.8)		(9.3)		(1.4)		—		(11.5)
Proceeds from sale of property, plant, and equipment	—		—		0.1		—		0.1
Intercompany transactions	14.9		(38.3)		1.8		21.6		—
Net cash provided by (used in) investing activities	14.1		(47.6)		0.5		21.6		(11.4)
Repayment of debt	(250.0)		—		—		—		(250.0)
Proceeds from issuance of debt	243.8		—		—		—		243.8
Repayments on Hawesville term loan	(15.0)		—		—		—		(15.0)
Borrowings under revolving credit facilities	128.6		—		45.0		—		173.6
Repayments under revolving credit facilities	(127.6)		—		—		—		(127.6)
Debt issuance costs	(1.1)		—		—		—		(1.1)
Debt retirement costs	(0.2)		—		—		—		(0.2)
Intercompany transactions	36.3		27.4		(42.1)		(21.6)		—
Net cash provided by (used in) financing activities	14.8		27.4		2.9		(21.6)		23.5
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2.8		1.1		41.5		—		45.4
Cash, cash equivalents and restricted cash, beginning of period	0.3		0.9		38.5		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	3.1	$	2.0	$	80.0	$	—	$	85.1

Condensed Consolidating Statements of Cash Flows
For the nine months ended September 30, 2019
	The Company		Combined Guarantor Subsidiaries		Combined Non-Guarantor Subsidiaries		Consolidating Adjustments		Total Consolidated
Net cash provided by (used in) operating activities	$	(57.1)	$	45.0	$	7.7	$	—	$	(4.4)
Purchase of property, plant and equipment	(0.6)		(26.4)		(12.9)		—		(39.9)
Proceeds from sale of joint venture	—		—		10.5		—		10.5
Intercompany transactions	(9.3)		(52.6)		2.0		59.9		—
Net cash provided by (used in) investing activities	(9.9)		(79.0)		(0.4)		59.9		(29.4)
Borrowing under Hawesville term loan	40.0		—		—		—		40.0
Borrowings under revolving credit facilities	295.1		—		19.5		—		314.6
Repayments under revolving credit facilities	(318.0)		—		(19.5)		—		(337.5)
Other short term borrowings	3.4		—		—		—		3.4
Repayment on other short term borrowings	(3.4)		—		—		—		(3.4)
Issuance of common stock	0.3		—		—		—		0.3
Intercompany transactions	51.0		34.0		(25.1)		(59.9)		—
Net cash provided by (used in) financing activities	68.4		34.0		(25.1)		(59.9)		17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	1.4		—		(17.8)		—		(16.4)
Cash, cash equivalents and restricted cash, beginning of period	0.1		0.8		38.8		—		39.7
Cash, cash equivalents and restricted cash, end of period	$	1.5	$	0.8	$	21.0	$	—	$	23.3

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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Apr. 29, 2019
Related Party Transaction [Line Items]
Related parties	$ 235.8	$ 282.3	$ 792.4	$ 898.7
Glencore [Member]
Related Party Transaction [Line Items]
Related parties	235.8	282.3	792.4	898.7
Hawesville [Member]
Related Party Transaction [Line Items]
Term loan - less current portion					$ 40.0
Aluminum [Member] | Glencore [Member]
Related Party Transaction [Line Items]
Related parties	$ 16.4	$ 4.5	$ 17.6	$ 26.2
Consolidated Sales [Member] | Customer Concentration Risk [Member] | Glencore [Member]
Related Party Transaction [Line Items]
Major customer, percentage of revenue, net (percent)	60.00%	64.50%	65.20%	64.10%
Glencore [Member]
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners	42.90%		42.90%
Economic ownership percentage by related party	46.80%		46.80%

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Related Party Transactions - Summary of related party transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction [Line Items]
Net sales to Glencore	$ 235.8	$ 282.3	$ 792.4	$ 898.7
Glencore [Member]
Related Party Transaction [Line Items]
Net sales to Glencore	235.8	282.3	792.4	898.7
Purchases from Glencore	63.7	43.6	137.3	249.8
BHH [Member]
Related Party Transaction [Line Items]
Purchases from Glencore	$ 0.0	$ 2.2	$ 0.0	$ 16.8
Percentage of voting interests sold	40.00%		40.00%

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Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 392.9	$ 438.0	$ 1,216.0	$ 1,401.2
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	242.0	277.1	764.0	911.9
Iceland [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 150.9	$ 160.9	$ 452.0	$ 489.3

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Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
ASSETS:
Cash equivalents	$ 71.2	$ 23.3
Trust assets	0.2	0.2
Surety bonds		1.8
Derivative instruments	18.0	19.7
TOTAL	89.4	45.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	5.7	4.2
TOTAL	5.7	4.2
Level 1 [Member]
ASSETS:
Cash equivalents	71.2	23.3
Trust assets	0.2	0.2
Surety bonds		1.8
Derivative instruments	0.0	0.0
TOTAL	71.4	25.3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	0.0	0.0
TOTAL	0.0	0.0
Level 2 [Member]
ASSETS:
Cash equivalents	0.0	0.0
Trust assets	0.0	0.0
Surety bonds		0.0
Derivative instruments	11.4	9.1
TOTAL	11.4	9.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	4.9	1.3
TOTAL	4.9	1.3
Level 3 [Member]
ASSETS:
Cash equivalents	0.0	0.0
Trust assets	0.0	0.0
Surety bonds		0.0
Derivative instruments	6.6	10.6
TOTAL	6.6	10.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	0.8	2.9
TOTAL	$ 0.8	$ 2.9

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Fair Value Measurements - Significant Unobservable Inputs (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) MWh T	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
LME Swap [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 6.6	$ 6.1	$ 10.6
LME Swap [Member] | Discounted Cash Flow [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, percentage	0.1000
Contingent obligation [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 0.0
Contingent obligation [Member] | Minimum [Member] | Discounted Cash Flow [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset (in tones) | T	1,754
Contingent obligation [Member] | Maximum [Member] | Discounted Cash Flow [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset (in tones) | T	2,312
Hawesville L4 Power Price Swaps [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ (0.8)	$ (1.5)	$ (2.9)	$ (1.5)	$ (2.7)	$ 0.0
Hawesville L4 Power Price Swaps [Member] | Discounted Cash Flow [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability (in MwH) | MWh	0.45

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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Nordpool Power Price Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning				$ 4.7
Total realized/unrealized gains (losses)
Included in net income (loss)				(1.0)
Purchases, sales, settlements
Purchases				0.0
Sales				0.0
Settlements				0.0
Transfers into Level 3				0.0
Transfers out of Level 3				(3.7)
Balance, ending		$ 0.0		0.0
Change in unrealized gains (losses)				(1.0)
LME Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning	$ 6.1		$ 10.6
Total realized/unrealized gains (losses)
Included in net income (loss)	(4.2)		0.8
Purchases, sales, settlements
Purchases	0.0		0.0
Sales	0.0		0.0
Settlements	0.0		0.0
Transfers into Level 3	4.7		4.7
Transfers out of Level 3	0.0		(9.5)
Balance, ending	6.6		6.6
Change in unrealized gains (losses)	(4.2)		0.8
Hawesville L4 Power Price Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning	(1.5)	(2.7)	(2.9)	0.0
Total realized/unrealized gains (losses)
Included in net income (loss)	(0.2)	1.2	(1.6)	1.2
Purchases, sales, settlements
Purchases	0.0	0.0	0.0	0.0
Sales	0.0	0.0	0.0	0.0
Settlements	0.9	0.0	3.7	0.0
Transfers into Level 3	0.0	0.0	0.0	(2.7)
Transfers out of Level 3	0.0	0.0	0.0	0.0
Balance, ending	(0.8)	(1.5)	(0.8)	(1.5)
Change in unrealized gains (losses)	$ 0.7	1.2	$ 2.1	(1.5)
FX Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning				(0.3)
Total realized/unrealized gains (losses)
Included in net income (loss)				(0.3)
Purchases, sales, settlements
Purchases				0.0
Sales				0.0
Settlements				0.0
Transfers into Level 3				0.0
Transfers out of Level 3				0.6
Balance, ending		0.0		0.0
Change in unrealized gains (losses)				(0.3)
United States [Member] | LME Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning		6.9		0.3
Total realized/unrealized gains (losses)
Included in net income (loss)		8.8		15.6
Purchases, sales, settlements
Purchases		0.0		0.0
Sales		0.0		0.0
Settlements		0.0		0.0
Transfers into Level 3		0.0		(0.2)
Transfers out of Level 3		0.0		0.0
Balance, ending		15.7		15.7
Change in unrealized gains (losses)		8.8		15.4
Iceland [Member] | LME Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning				(0.2)
Total realized/unrealized gains (losses)
Included in net income (loss)				(0.1)
Purchases, sales, settlements
Purchases				0.0
Sales				0.0
Settlements				0.0
Transfers into Level 3				0.0
Transfers out of Level 3				0.3
Balance, ending		$ 0.0		0.0
Change in unrealized gains (losses)				$ (0.1)

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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (58.2)	$ (20.7)	$ (87.8)	$ (76.0)
Amount allocated to common stockholders (as percent)	100.00%	100.00%	100.00%	100.00%
Basic and diluted EPS
Net income (loss) allocated to common stockholders (shares)	89.5	88.9	89.4	88.6
Basic and diluted (USD per share)	$ (0.65)	$ (0.23)	$ (0.98)	$ (0.86)
Securities excluded from calculation of diluted EPS (shares)	1.7	0.7	1.2	0.6

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Shareholders’ Equity (Details) - USD ($)	3 Months Ended	9 Months Ended		66 Months Ended	117 Months Ended
	Mar. 31, 2015	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2011	Dec. 31, 2008
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		195,000,000		195,000,000	195,000,000	195,000,000
Common stock, par value (in dollars per share)		$ 0.01		$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued (in shares)		96,671,355		96,671,355	96,671,355	96,372,182
Common stock, shares, outstanding (in shares)		89,484,834		89,484,834	89,484,834	89,185,661
Preferred stock, shares authorized (in shares)		5,000,000		5,000,000	5,000,000	5,000,000
Preferred stock par value (in dollars per share)		$ 0.01		$ 0.01	$ 0.01	$ 0.01
Preferred shares issued (in shares)								160,000
Number of shares issued for each share of preferred stock (in shares)		100		100	100
Stock repurchase program, authorized amount	$ 130,000,000.0						$ 60,000,000.0
Stock repurchase program, authorized, increase amount	$ 70,000,000.0
Treasury stock, shares, acquired (in shares)				0	7,186,521
Treasury stock, value, acquired, cost method					$ 86,300,000
Stock repurchase program, remaining authorized repurchase amount		$ 43,700,000		$ 43,700,000	$ 43,700,000
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred shares outstanding (in shares)		66,039		66,039	66,039	67,323
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		67,323	71,967
Conversion of convertible preferred stock (in shares)		(1,284)	(3,392)
Issuance for stock compensation plans (in shares)		0	0
Ending balance (in shares)		66,039	68,575	66,039	66,039
Treasury [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		7,186,521	7,186,521
Conversion of convertible preferred stock (in shares)		0	0
Issuance for stock compensation plans (in shares)		0	0
Ending balance (in shares)		7,186,521	7,186,521	7,186,521	7,186,521
Common stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		89,185,661	88,103,440
Conversion of convertible preferred stock (in shares)		128,389	339,166
Issuance for stock compensation plans (in shares)		170,784	451,161
Ending balance (in shares)		89,484,834	88,893,767	89,484,834	89,484,834

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (0.3)	$ 1.3		$ 1.6	$ 5.7
Impact of ASU 2018-02			$ 1.3		$ (1.3)

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Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventory, Net [Abstract]
Raw materials	$ 75.2	$ 101.3
Work-in-process	41.3	44.1
Finished goods	18.4	34.3
Operating and other supplies	132.6	140.9
Total inventories	$ 267.5	$ 320.6

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Debt - Activity (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Hawesville term loan - current portion	$ 20,000,000.0		$ 20,000,000.0
Hancock County industrial revenue bonds (IRBs) due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%))	7,800,000		7,800,000
Hawesville term loan - less current portion, interest payable monthly	5,000,000.0		20,000,000.0
Total debt	325,600,000		301,000,000.0
Hawesville [Member]
Debt Instrument [Line Items]
Hawesville term loan - current portion	20,000,000.0		20,000,000.0
Hawesville term loan - less current portion, interest payable monthly	5,000,000.0		20,000,000.0
Long-term Debt [Member] | Senior secured notes due June 01, 2021 [Member]
Debt Instrument [Line Items]
Senior securities notes	0		$ 249,200,000
Stated interest rate, percentage		7.50%	7.50%
Debt discount			$ 800,000
Long-term Debt [Member] | Senior Secured Notes Due June 01, 2025 [Member]
Debt Instrument [Line Items]
Senior securities notes	$ 242,800,000		0
Stated interest rate, percentage	12.00%
Debt discount				$ 2,400,000
Financing fees				$ 4,800,000
Short-term Debt [Member] | Industrial revenue bonds due April 1, 2028 [Member]
Debt Instrument [Line Items]
Hancock County industrial revenue bonds (IRBs) due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%))	$ 7,800,000		7,800,000
Stated interest rate, percentage	0.34%
Short-term Debt [Member] | Industrial revenue bonds due April 1, 2028 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate, maximum	12.00%
Short-term Debt [Member] | Revolving credit facility [Member]
Debt Instrument [Line Items]
Stated interest rate, percentage	5.375%
Interest payable outstanding	$ 0
Principal payment	15,000,000.0
Interest payable	$ 1,600,000
Short-term Debt [Member] | Revolving credit facility [Member] | Revolving Credit Facility, Portion Subject To LIBOR Rate [Member]
Debt Instrument [Line Items]
Stated interest rate, percentage	0.30%
U.S. revolving credit facility [Member] | Short-term Debt [Member] | Revolving credit facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 5,000,000.0		4,000,000.0
Stated interest rate, percentage	4.00%
Iceland revolving line of credit [Member] | Long-term Debt [Member] | Revolving credit facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 45,000,000.0		$ 0
Stated interest rate, percentage	3.20%

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Debt - Narrative (Details)			3 Months Ended		9 Months Ended
	Jul. 01, 2020 USD ($)	Apr. 29, 2019 USD ($) payment	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Proceeds from issuance of debt					$ 243,800,000	$ 0
Loss on early extinguishment of debt			$ (1,200,000)	$ 0	(1,200,000)	$ 0
U.S. revolving credit facility [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings			5,000,000.0		5,000,000.0
Credit facility maximum amount			175,000,000.0		175,000,000.0
U.S. revolving credit facility [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Credit facility face amount			175,000,000.0		175,000,000.0
U.S. letter of credit [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility amount			110,000,000.0		110,000,000.0
U.S. revolving credit facility, accordion [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Credit facility face amount			50,000,000.0		50,000,000.0
Iceland revolving line of credit [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings			45,000,000.0		45,000,000.0
Credit facility maximum amount			$ 50,000,000.0		$ 50,000,000.0
Senior Secured Notes Due June 01, 2025 [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of debt	$ 243,800,000
Senior Secured Notes Due June 01, 2025 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Stated interest rate, percentage			12.00%		12.00%
Face amount	$ 250,000,000.0
Interest rate, cash percentage	10.00%
Interest rate, additional notes or cash percentage	2.00%
Redemption price, percentage					100.00%
Redemption period	12 months
Percentage of outstanding amount, offer to purchase	101.00%
Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Stated interest rate, percentage							7.50%	7.50%
Face amount	$ 243,700,000
Redemption price, percentage					100.00%
Loss on early extinguishment of debt					$ 1,200,000
Revolving credit facility [Member] | Iceland revolving line of credit [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Stated interest rate, percentage			3.20%		3.20%
Revolving credit facility			$ 45,000,000.0		$ 45,000,000.0			$ 0
Hawesville [Member]
Line of Credit Facility [Line Items]
Due to related parties, noncurrent		$ 40,000,000.0
Debt instrument, payment terms, number of monthly payments | payment		24
London Interbank Offered Rate (LIBOR) [Member] | Hawesville [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		5.375%

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Debt - Redemption Rights (Details) - Senior Secured Notes Due June 01, 2025 [Member] - Long-term Debt [Member]	9 Months Ended
	Sep. 30, 2020
Line of Credit Facility [Line Items]
Redemption price, percentage	100.00%
2021 [Member]
Line of Credit Facility [Line Items]
Redemption price, percentage	105.00%
2022 [Member]
Line of Credit Facility [Line Items]
Redemption price, percentage	102.50%
2023 [Member]
Line of Credit Facility [Line Items]
Redemption price, percentage	101.25%
2024 [Member]
Line of Credit Facility [Line Items]
Redemption price, percentage	100.00%

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Debt - Credit Facility (Details)	Sep. 30, 2020 USD ($)
U.S. revolving credit facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum amount	$ 175,000,000.0
Borrowing availability	124,600,000
Outstanding letters of credit issued	36,600,000
Outstanding borrowings	5,000,000.0
Borrowing availability, net of borrowings	83,000,000.0
Iceland revolving line of credit [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Credit facility maximum amount	50,000,000.0
Borrowing availability	50,000,000.0
Outstanding letters of credit issued	0
Outstanding borrowings	45,000,000.0
Borrowing availability, net of borrowings	$ 5,000,000.0

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Commitments and Contingencies (Details)		1 Months Ended	9 Months Ended		12 Months Ended
	Aug. 18, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2020 USD ($) Labor_Union MW	Sep. 30, 2019 USD ($)	Dec. 31, 2013 USD ($)
Labor Commitments [Abstract]
Percentage of total work force in union			66.00%
Percentage of Grundartangi work force represented by the labor unions (in hundredths)			86.00%
Number of labor unions Grundartangi subsidiary entered into a new labor agreement with | Labor_Union			5
Percentage of U.S. based work force represented by a union (in hundredths)			57.00%
Ravenswood Retiree Medical Benefits Changes [Member]
Ravenswood litigation [Abstract]
Gain (loss) related to litigation settlement		$ 5,500,000
Loss contingency accrual		12,500,000
PBGC Agreement [Member]
PBGC Settlement [Abstract]
Required pension contributions above minimum					$ 17,400,000
Payment for pension benefits			$ 0	$ 0
Pension contributions above minimum remaining			$ 9,600,000
Hawesville [Member]
Power Contingencies [Abstract]
Power supply agreement, termination notice period			1 year
Sebree [Member]
Power Contingencies [Abstract]
Power supply agreement, termination notice period			1 year
South Carolina Public Service Authority [Member]
Power Contingencies [Abstract]
Power agreement, power supply from source one, percentage			25.00%
Power agreement, power supply from source two, percentage			75.00%
Other Power Suppliers [Member]
Power Contingencies [Abstract]
Power supply agreement, termination notice period			60 days
Grundartangi - HS, Landsvirkjun and OR [Member]
Power Contingencies [Abstract]
Power currently available under the power purchase agreement (in megawatts) | MW			525
Grundartangi - Landsvirkjun [Member]
Power Contingencies [Abstract]
Power currently available under the power purchase agreement (in megawatts) | MW			161
Helguvik [Member]
Power Contingencies [Abstract]
Power currently available under the power purchase agreement (in megawatts) | MW			47.5
Netherlands [Member]
Labor Commitments [Abstract]
Percentage of Vlissingen work force represented by the labor union (in hundredths)			100.00%
Ravenswood Retiree Medical Benefits Changes [Member]
Ravenswood litigation [Abstract]
Ravenswood litigation settlement amount	$ 23,000,000.0
Ravenswood litigation settlement installment period	10 years		9 years
Litigation payment to trust		$ 5,000,000.0
Litigation settlement, amount awarded to other party, annual payments			$ 2,000,000.0
Other Current Liabilities [Member] | Ravenswood Retiree Medical Benefits Changes [Member]
Ravenswood litigation [Abstract]
Litigation settlement, amount awarded to other party, annual payments			2,000,000.0
Other Liabilities [Member] | Ravenswood Retiree Medical Benefits Changes [Member]
Ravenswood litigation [Abstract]
Litigation settlement, amount awarded to other party, annual payments			$ 7,300,000

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Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	$ (109.5)			$ (109.5)		$ (113.6)
Income tax effect	3.0			3.0		3.8
Accumulated other comprehensive loss	(106.5)			(106.5)		(109.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	648.7	$ 709.4	$ 762.2	675.0	$ 762.2
Impact of ASU 2018-02			1.3		(1.3)
Net amount reclassified to net income (loss)	1.1	0.7		3.3	2.0
Balance, end	592.4	689.9		592.4	689.9
Defined benefit plan and other postretirement liabilities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	(111.7)			(111.7)		(115.9)
Income tax effect	(3.4)			(3.4)		(4.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	(109.5)	(100.7)	(100.7)	(111.7)	(100.7)
Impact of ASU 2018-02					(1.3)
Net amount reclassified to net income (loss)	1.2	0.7		3.4	2.1
Balance, end	(108.3)	(100.0)		(108.3)	(100.0)
Unrealized gain (loss) on financial instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	2.2			2.2		2.3
Income tax effect	0.4			0.4		$ 0.4
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	1.9	2.0	2.0	1.9	2.0
Impact of ASU 2018-02					0.0
Net amount reclassified to net income (loss)	(0.1)	0.0		(0.1)	(0.1)
Balance, end	1.8	2.0		1.8	2.0
Accumulated other comprehensive loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	(107.6)	(98.7)	$ (98.7)	(109.8)	(98.7)
Balance, end	$ (106.5)	$ (98.0)		$ (106.5)	$ (98.0)

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Components of Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of goods sold	$ 420.0	$ 451.7	$ 1,251.3	$ 1,431.8
Selling, general and administrative expenses	11.0	11.6	31.7	38.2
Other operating (income) expense - net	(0.2)	(0.1)	0.3	0.4
Income tax effect	0.3	(1.3)	(1.6)	(5.7)
Net of tax	58.2	20.7	87.8	76.0
Reclassification out of accumulated other comprehensive income [Member] | Defined benefit plan and other postretirement liabilities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of goods sold	0.8	0.8	2.3	1.7
Selling, general and administrative expenses	0.1	(0.3)	0.5	(0.9)
Other operating (income) expense - net	0.5	0.5	1.4	2.1
Income tax effect	(0.2)	(0.3)	(0.8)	(0.8)
Net of tax	1.2	0.7	3.4	2.1
Reclassification out of accumulated other comprehensive income [Member] | Unrealized loss on financial instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of goods sold	(0.1)	0.0	(0.1)	(0.1)
Income tax effect	0.0	0.0	0.0	0.0
Net of tax	$ (0.1)	$ 0.0	$ (0.1)	$ (0.1)

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Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.3	$ 1.0	$ 3.7	$ 2.5
Interest cost	2.9	3.3	8.5	10.0
Expected return on plan assets	(5.3)	(4.5)	(15.6)	(13.7)
Amortization of prior service costs	0.1	0.0	0.1	0.6
Amortization of net loss	1.6	1.6	4.9	4.9
Net periodic benefit cost	0.6	1.4	1.6	4.3
Other Postretirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	(0.0)	0.0	0.2	0.8
Interest cost	0.8	1.1	2.3	3.4
Amortization of prior service costs	(0.8)	(1.2)	(2.4)	(4.3)
Amortization of net loss	0.5	0.6	1.6	1.7
Net periodic benefit cost	$ 0.5	$ 0.5	$ 1.7	$ 1.6

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Derivatives (Details) € in Millions	9 Months Ended
	Sep. 30, 2020 EUR (€) MWh t
LME Swap [Member]
Derivative [Line Items]
Other forward delivery contracts to sell primary aluminum, open (in tonnes)	124,378
Midwest Premium (MWP) [Member]
Derivative [Line Items]
Open position to offset fixed prices	126,000
Fixed For Floating Swaps [Member]
Derivative [Line Items]
Open position to offset fixed prices	13,144
Hawesville L4 Power Price Swaps [Member]
Derivative [Line Items]
Power available | MWh	198,810
Nordpool Power Price Swap [Member] | Grundartangi [Member]
Derivative [Line Items]
Power available | MWh	1,373,790
FX Swap [Member]
Derivative [Line Items]
Derivative asset | €	€ 34.6

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Derivatives - Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Due from affiliates	$ 15.0	$ 30.1
Due from affiliates, noncurrent	1.3	0.5
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative asset	18.0	19.7
Derivative liability	5.7	4.2
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative asset	17.0	19.7
Derivative liability	5.7	3.6
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative asset	1.0	0.0
Derivative liability	0.0	0.6
Glencore [Member] | Commodity Contract [Member]
Derivative [Line Items]
Due from affiliates	0.1	0.2
Due from affiliates, noncurrent	$ 1.3	$ 0.5

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Derivatives - Net Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	$ (9.4)	$ 10.3	$ (1.9)	$ 10.7
Commodity Contract [Member]
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	(11.0)	10.6	0.8	11.2
Commodity Contract [Member] | Glencore [Member]
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	(4.6)	1.9	0.1	2.7
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	$ 1.6	$ (0.3)	$ (2.7)	$ (0.5)

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Condensed Consolidating Financial Information - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
NET SALES
Related parties	$ 235.8	$ 282.3	$ 792.4	$ 898.7
Other customers	157.1	155.7	423.6	502.5
Total net sales	392.9	438.0	1,216.0	1,401.2
Cost of goods sold	420.0	451.7	1,251.3	1,431.8
Gross profit (loss)	(27.1)	(13.7)	(35.3)	(30.6)
Selling, general and administrative expenses	11.0	11.6	31.7	38.2
Other operating (income) expense - net	(0.2)	(0.1)	0.3	0.4
Operating income (loss)	(37.9)	(25.2)	(67.3)	(69.2)
Interest expense - Hawesville term loan	(0.4)	(0.8)	(1.6)	(1.3)
Interest expense	(9.1)	(5.6)	(21.0)	(17.3)
Intercompany interest	0.0	0.0	0.0	0.0
Interest income	0.1	0.2	0.6	0.6
Net gain (loss) on forward and derivative contracts	(9.4)	10.3	(1.9)	10.7
Loss on early extinguishment of debt	(1.2)	0.0	(1.2)	0.0
Other income (expense) - net	0.0	(0.9)	3.0	(1.6)
Income (loss) before income taxes and equity in earnings of joint ventures	(57.9)	(22.0)	(89.4)	(78.1)
Income tax benefit (expense)	(0.3)	1.3	1.6	5.7
Income (loss) before equity in earnings of joint ventures	(58.2)	(20.7)	(87.8)	(72.4)
Loss on sale of BHH	0.0	0.0	0.0	(4.3)
Equity in earnings of joint ventures	0.0	0.0	0.0	0.7
Net income (loss)	(58.2)	(20.7)	(87.8)	(76.0)
Other comprehensive income before income tax effect	1.3	1.0	4.1	2.8
Income tax effect	(0.2)	(0.3)	(0.8)	(0.8)
Other comprehensive income (loss)	1.1	0.7	3.3	2.0
Total comprehensive income (loss)	(57.1)	(20.0)	(84.5)	(74.0)
Consolidating Adjustments [Member]
NET SALES
Related parties	0.0	0.0	0.0	0.0
Other customers	0.0	0.0	0.0	0.0
Total net sales	0.0	0.0	0.0	0.0
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit (loss)	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Other operating (income) expense - net	0.0	0.0	0.0	0.0
Operating income (loss)	0.0	0.0	0.0	0.0
Interest expense - Hawesville term loan	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Intercompany interest	0.0	0.0	0.0	0.0
Interest income	0.0	0.0	0.0	0.0
Net gain (loss) on forward and derivative contracts	0.0	0.0	0.0	0.0
Loss on early extinguishment of debt	0.0		0.0
Other income (expense) - net	0.0	0.0	0.0	0.0
Income (loss) before income taxes and equity in earnings of joint ventures	0.0	0.0	0.0	0.0
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of joint ventures	0.0	0.0	0.0	0.0
Loss on sale of BHH				0.0
Equity in earnings of joint ventures	34.9	20.1	79.2	58.0
Net income (loss)	34.9	20.1	79.2	58.0
Other comprehensive income before income tax effect	(1.2)	(1.3)	(3.6)	(3.6)
Income tax effect	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	(1.2)	(1.3)	(3.6)	(3.6)
Total comprehensive income (loss)	33.7	18.8	75.6	54.4
The Company [Member] | Reportable Legal Entities [Member]
NET SALES
Related parties	0.0	0.0	0.0	0.0
Other customers	0.0	0.0	0.0	0.0
Total net sales	0.0	0.0	0.0	0.0
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit (loss)	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	10.6	11.3	30.5	36.9
Other operating (income) expense - net	0.0	0.0	0.0	0.0
Operating income (loss)	(10.6)	(11.3)	(30.5)	(36.9)
Interest expense - Hawesville term loan	(0.4)	(0.8)	(1.6)	(1.3)
Interest expense	(8.3)	(5.1)	(18.8)	(15.9)
Intercompany interest	8.1	8.8	24.6	26.2
Interest income	0.0	0.1	0.3	0.2
Net gain (loss) on forward and derivative contracts	(10.0)	10.2	20.7	10.3
Loss on early extinguishment of debt	(1.2)		(1.2)
Other income (expense) - net	(0.1)	0.1	0.0	0.9
Income (loss) before income taxes and equity in earnings of joint ventures	(22.5)	2.0	(6.5)	(16.5)
Income tax benefit (expense)	0.0	0.7	1.0	1.6
Income (loss) before equity in earnings of joint ventures	(22.5)	2.7	(5.5)	(14.9)
Loss on sale of BHH				0.0
Equity in earnings of joint ventures	(35.7)	(23.4)	(82.3)	(61.1)
Net income (loss)	(58.2)	(20.7)	(87.8)	(76.0)
Other comprehensive income before income tax effect	1.3	1.0	4.1	2.8
Income tax effect	(0.2)	(0.3)	(0.8)	(0.8)
Other comprehensive income (loss)	1.1	0.7	3.3	2.0
Total comprehensive income (loss)	(57.1)	(20.0)	(84.5)	(74.0)
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
NET SALES
Related parties	116.4	132.9	420.5	432.8
Other customers	125.7	144.2	343.5	479.1
Total net sales	242.1	277.1	764.0	911.9
Cost of goods sold	273.3	288.3	820.6	921.5
Gross profit (loss)	(31.2)	(11.2)	(56.6)	(9.6)
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Other operating (income) expense - net	0.0	0.0	0.0	0.0
Operating income (loss)	(31.2)	(11.2)	(56.6)	(9.6)
Interest expense - Hawesville term loan	0.0	0.0	0.0	0.0
Interest expense	(0.4)	(0.4)	(1.2)	(1.2)
Intercompany interest	2.8	2.6	8.2	7.6
Interest income	0.0	0.0	0.0	0.0
Net gain (loss) on forward and derivative contracts	0.4	0.3	1.1	1.0
Loss on early extinguishment of debt	0.0		0.0
Other income (expense) - net	0.2	(0.1)	0.9	(2.0)
Income (loss) before income taxes and equity in earnings of joint ventures	(28.2)	(8.8)	(47.6)	(4.2)
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of joint ventures	(28.2)	(8.8)	(47.6)	(4.2)
Loss on sale of BHH				0.0
Equity in earnings of joint ventures	0.8	3.4	3.1	3.1
Net income (loss)	(27.4)	(5.4)	(44.5)	(1.1)
Other comprehensive income before income tax effect	0.8	0.8	2.3	1.6
Income tax effect	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	0.8	0.8	2.3	1.6
Total comprehensive income (loss)	(26.6)	(4.6)	(42.2)	0.5
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
NET SALES
Related parties	119.4	149.4	371.9	465.9
Other customers	31.4	11.5	80.1	23.4
Total net sales	150.8	160.9	452.0	489.3
Cost of goods sold	146.7	163.4	430.7	510.3
Gross profit (loss)	4.1	(2.5)	21.3	(21.0)
Selling, general and administrative expenses	0.4	0.3	1.2	1.3
Other operating (income) expense - net	(0.2)	(0.1)	0.3	0.4
Operating income (loss)	3.9	(2.7)	19.8	(22.7)
Interest expense - Hawesville term loan	0.0	0.0	0.0	0.0
Interest expense	(0.4)	(0.1)	(1.0)	(0.2)
Intercompany interest	(10.9)	(11.4)	(32.8)	(33.8)
Interest income	0.1	0.1	0.3	0.4
Net gain (loss) on forward and derivative contracts	0.2	(0.2)	(23.7)	(0.6)
Loss on early extinguishment of debt	0.0		0.0
Other income (expense) - net	(0.1)	(0.9)	2.1	(0.5)
Income (loss) before income taxes and equity in earnings of joint ventures	(7.2)	(15.2)	(35.3)	(57.4)
Income tax benefit (expense)	(0.3)	0.6	0.6	4.1
Income (loss) before equity in earnings of joint ventures	(7.5)	(14.6)	(34.7)	(53.3)
Loss on sale of BHH				(4.3)
Equity in earnings of joint ventures	0.0	(0.1)	0.0	0.7
Net income (loss)	(7.5)	(14.7)	(34.7)	(56.9)
Other comprehensive income before income tax effect	0.4	0.5	1.3	2.0
Income tax effect	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	0.4	0.5	1.3	2.0
Total comprehensive income (loss)	$ (7.1)	$ (14.2)	$ (33.4)	$ (54.9)
Century Aluminum [Member] | Combined Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Ownership percentage	100.00%		100.00%

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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]
Cash & cash equivalents	$ 81.4		$ 38.9
Restricted cash	3.7		0.8
Accounts receivable - net	50.6		70.1
Due from affiliates	15.0		30.1
Inventories	267.5		320.6
Derivative assets	10.6		14.6
Prepaid and other current assets	14.5		12.2
Total current assets	443.3		487.3
Property, plant and equipment - net	899.7		949.2
Investment in subsidiaries	0.0		0.0
Due from affiliates - less current portion	1.3		0.5
Other assets	61.1		62.7
TOTAL	1,405.4		1,499.7
Accounts payable, trade	85.6		97.1
Due to affiliates	2.9		32.9
Accrued and other current liabilities	69.5		65.5
Accrued employee benefits costs	10.4		10.4
Hawesville term loan	20.0		20.0
U.S. revolving credit facility	5.0		4.0
Industrial revenue bonds	7.8		7.8
Total current liabilities	201.2		233.7
Senior notes payable	242.8		249.2
Hawesville term loan - less current portion	5.0		20.0
Iceland revolving credit facility	45.0		0.0
Accrued pension benefits costs - less current portion	56.0		60.8
Accrued postretirement benefits costs - less current portion	98.8		100.7
Due to affiliates - long term	0.0		0.0
Other liabilities	46.2		42.4
Leases - right of use liabilities	23.4		22.8
Deferred taxes	94.6		95.1
Total noncurrent liabilities	611.8		591.0
Preferred stock	0.0		0.0
Common stock	1.0		1.0
Other shareholders' equity	591.4		674.0
Total shareholders’ equity	592.4	$ 648.7	675.0	$ 689.9	$ 709.4	$ 762.2
TOTAL	1,405.4		1,499.7
Consolidating Adjustments [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash & cash equivalents	0.0		0.0
Restricted cash	0.0		0.0
Accounts receivable - net	0.0		0.0
Due from affiliates	0.0		0.0
Inventories	0.0		0.0
Derivative assets	0.0		0.0
Prepaid and other current assets	0.0		0.0
Total current assets	0.0		0.0
Property, plant and equipment - net	0.0		0.0
Investment in subsidiaries	(599.7)		(672.2)
Due from affiliates - less current portion	(1,355.3)		(1,292.0)
Other assets	0.0		0.0
TOTAL	(1,955.0)		(1,964.2)
Accounts payable, trade	0.0		0.0
Due to affiliates	0.0		0.0
Accrued and other current liabilities	0.0		0.0
Accrued employee benefits costs	0.0		0.0
Hawesville term loan	0.0		0.0
U.S. revolving credit facility	0.0
Industrial revenue bonds	0.0		0.0
Total current liabilities	0.0		0.0
Senior notes payable	0.0		0.0
Hawesville term loan - less current portion	0.0		0.0
Iceland revolving credit facility	0.0
Accrued pension benefits costs - less current portion	0.0		0.0
Accrued postretirement benefits costs - less current portion	0.0		0.0
Due to affiliates - long term	(1,355.3)		(1,292.0)
Other liabilities	0.0		0.0
Leases - right of use liabilities	0.0		0.0
Deferred taxes	0.0		0.0
Total noncurrent liabilities	(1,355.3)		(1,292.0)
Preferred stock	0.0		0.0
Common stock	0.0		(0.1)
Other shareholders' equity	(599.7)		(672.1)
Total shareholders’ equity	(599.7)		(672.2)
TOTAL	(1,955.0)		(1,964.2)
The Company [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash & cash equivalents	3.1		0.3
Restricted cash	0.0		0.0
Accounts receivable - net	1.7		0.7
Due from affiliates	0.0		0.0
Inventories	0.0		0.0
Derivative assets	9.8		12.2
Prepaid and other current assets	4.1		3.0
Total current assets	18.7		16.2
Property, plant and equipment - net	14.8		17.2
Investment in subsidiaries	533.8		609.5
Due from affiliates - less current portion	768.7		749.5
Other assets	38.0		38.1
TOTAL	1,374.0		1,430.5
Accounts payable, trade	3.2		2.3
Due to affiliates	1.6		0.0
Accrued and other current liabilities	23.8		23.5
Accrued employee benefits costs	1.9		1.9
Hawesville term loan	20.0		20.0
U.S. revolving credit facility	5.0
Industrial revenue bonds	0.0		0.0
Total current liabilities	55.5		47.7
Senior notes payable	242.8		249.2
Hawesville term loan - less current portion	5.0		20.0
Iceland revolving credit facility	0.0
Accrued pension benefits costs - less current portion	23.9		25.1
Accrued postretirement benefits costs - less current portion	1.0		1.1
Due to affiliates - long term	439.8		403.4
Other liabilities	7.5		3.5
Leases - right of use liabilities	6.1		5.5
Deferred taxes	0.0		0.0
Total noncurrent liabilities	726.1		707.8
Preferred stock	0.0		0.0
Common stock	1.0		1.0
Other shareholders' equity	591.4		674.0
Total shareholders’ equity	592.4		675.0
TOTAL	1,374.0		1,430.5
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash & cash equivalents	0.2		0.1
Restricted cash	1.8		0.8
Accounts receivable - net	46.8		64.1
Due from affiliates	4.5		10.9
Inventories	178.3		205.5
Derivative assets	0.0		0.0
Prepaid and other current assets	1.9		2.8
Total current assets	233.5		284.2
Property, plant and equipment - net	319.8		334.8
Investment in subsidiaries	65.9		62.7
Due from affiliates - less current portion	584.5		537.9
Other assets	4.2		5.7
TOTAL	1,207.9		1,225.3
Accounts payable, trade	59.4		66.2
Due to affiliates	1.3		2.2
Accrued and other current liabilities	22.3		27.3
Accrued employee benefits costs	7.7		7.7
Hawesville term loan	0.0		0.0
U.S. revolving credit facility	0.0
Industrial revenue bonds	7.8		7.8
Total current liabilities	98.5		111.2
Senior notes payable	0.0		0.0
Hawesville term loan - less current portion	0.0		0.0
Iceland revolving credit facility	0.0
Accrued pension benefits costs - less current portion	25.4		27.3
Accrued postretirement benefits costs - less current portion	96.0		97.8
Due to affiliates - long term	352.1		315.9
Other liabilities	24.4		22.2
Leases - right of use liabilities	0.0		0.4
Deferred taxes	0.4		0.4
Total noncurrent liabilities	498.3		464.0
Preferred stock	0.0		0.0
Common stock	0.0		0.0
Other shareholders' equity	611.1		650.1
Total shareholders’ equity	611.1		650.1
TOTAL	1,207.9		1,225.3
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash & cash equivalents	78.1		38.5
Restricted cash	1.9		0.0
Accounts receivable - net	2.1		5.3
Due from affiliates	10.5		19.2
Inventories	89.2		115.1
Derivative assets	0.8		2.4
Prepaid and other current assets	8.5		6.4
Total current assets	191.1		186.9
Property, plant and equipment - net	565.1		597.2
Investment in subsidiaries	0.0		0.0
Due from affiliates - less current portion	3.4		5.1
Other assets	18.9		18.9
TOTAL	778.5		808.1
Accounts payable, trade	23.0		28.6
Due to affiliates	0.0		30.7
Accrued and other current liabilities	23.4		14.7
Accrued employee benefits costs	0.8		0.8
Hawesville term loan	0.0		0.0
U.S. revolving credit facility	0.0
Industrial revenue bonds	0.0		0.0
Total current liabilities	47.2		74.8
Senior notes payable	0.0		0.0
Hawesville term loan - less current portion	0.0		0.0
Iceland revolving credit facility	45.0
Accrued pension benefits costs - less current portion	6.7		8.4
Accrued postretirement benefits costs - less current portion	1.8		1.8
Due to affiliates - long term	563.4		572.7
Other liabilities	14.3		16.7
Leases - right of use liabilities	17.3		16.9
Deferred taxes	94.2		94.7
Total noncurrent liabilities	742.7		711.2
Preferred stock	0.0		0.0
Common stock	0.0		0.1
Other shareholders' equity	(11.4)		22.0
Total shareholders’ equity	(11.4)		22.1
TOTAL	$ 778.5		$ 808.1

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Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	$ 33.3	$ (4.4)
Net cash provided by (used in) investing activities
Purchase of property, plant and equipment	(11.5)	(39.9)
Proceeds from sale of joint venture		10.5
Proceeds from sales of property, plant & equipment	0.1	0.0
Intercompany transactions	0.0	0.0
Net cash provided by (used in) investing activities	(11.4)	(29.4)
Net cash provided by (used in) financing activities
Repayment of debt	(250.0)	0.0
Proceeds from issuance of debt	243.8	0.0
Repayments on Hawesville term loan	(15.0)	0.0
Borrowing under Hawesville term loan	0.0	40.0
Borrowings under revolving credit facilities	173.6	314.6
Repayments under revolving credit facilities	(127.6)	(337.5)
Debt issuance costs	(1.1)	0.0
Debt retirement costs	(0.2)	0.0
Other short term borrowings		3.4
Repayment on other short-term borrowings	0.0	(3.4)
Issuance of common stock	0.0	0.3
Intercompany transactions	0.0	0.0
Net cash provided by (used in) financing activities	23.5	17.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	45.4	(16.4)
Cash, cash equivalents and restricted cash, beginning of period	39.7	39.7
Cash, cash equivalents and restricted cash, end of period	85.1	23.3
Consolidating Adjustments [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	0.0	0.0
Net cash provided by (used in) investing activities
Purchase of property, plant and equipment	0.0	0.0
Proceeds from sale of joint venture		0.0
Proceeds from sales of property, plant & equipment	0.0
Intercompany transactions	21.6	59.9
Net cash provided by (used in) investing activities	21.6	59.9
Net cash provided by (used in) financing activities
Repayment of debt	0.0
Proceeds from issuance of debt	0.0
Repayments on Hawesville term loan	0.0
Borrowing under Hawesville term loan		0.0
Borrowings under revolving credit facilities	0.0	0.0
Repayments under revolving credit facilities	0.0	0.0
Debt issuance costs	0.0
Debt retirement costs	0.0
Other short term borrowings		0.0
Repayment on other short-term borrowings		0.0
Issuance of common stock		0.0
Intercompany transactions	(21.6)	(59.9)
Net cash provided by (used in) financing activities	(21.6)	(59.9)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0.0	0.0
Cash, cash equivalents and restricted cash, beginning of period	0.0	0.0
Cash, cash equivalents and restricted cash, end of period	0.0	0.0
The Company [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	(26.1)	(57.1)
Net cash provided by (used in) investing activities
Purchase of property, plant and equipment	(0.8)	(0.6)
Proceeds from sale of joint venture		0.0
Proceeds from sales of property, plant & equipment	0.0
Intercompany transactions	14.9	(9.3)
Net cash provided by (used in) investing activities	14.1	(9.9)
Net cash provided by (used in) financing activities
Repayment of debt	(250.0)
Proceeds from issuance of debt	243.8
Repayments on Hawesville term loan	(15.0)
Borrowing under Hawesville term loan		40.0
Borrowings under revolving credit facilities	128.6	295.1
Repayments under revolving credit facilities	(127.6)	(318.0)
Debt issuance costs	(1.1)
Debt retirement costs	(0.2)
Other short term borrowings		3.4
Repayment on other short-term borrowings		(3.4)
Issuance of common stock		0.3
Intercompany transactions	36.3	51.0
Net cash provided by (used in) financing activities	14.8	68.4
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2.8	1.4
Cash, cash equivalents and restricted cash, beginning of period	0.3	0.1
Cash, cash equivalents and restricted cash, end of period	3.1	1.5
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	21.3	45.0
Net cash provided by (used in) investing activities
Purchase of property, plant and equipment	(9.3)	(26.4)
Proceeds from sale of joint venture		0.0
Proceeds from sales of property, plant & equipment	0.0
Intercompany transactions	(38.3)	(52.6)
Net cash provided by (used in) investing activities	(47.6)	(79.0)
Net cash provided by (used in) financing activities
Repayment of debt	0.0
Proceeds from issuance of debt	0.0
Repayments on Hawesville term loan	0.0
Borrowing under Hawesville term loan		0.0
Borrowings under revolving credit facilities	0.0	0.0
Repayments under revolving credit facilities	0.0	0.0
Debt issuance costs	0.0
Debt retirement costs	0.0
Other short term borrowings		0.0
Repayment on other short-term borrowings		0.0
Issuance of common stock		0.0
Intercompany transactions	27.4	34.0
Net cash provided by (used in) financing activities	27.4	34.0
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	1.1	0.0
Cash, cash equivalents and restricted cash, beginning of period	0.9	0.8
Cash, cash equivalents and restricted cash, end of period	2.0	0.8
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities	38.1	7.7
Net cash provided by (used in) investing activities
Purchase of property, plant and equipment	(1.4)	(12.9)
Proceeds from sale of joint venture		10.5
Proceeds from sales of property, plant & equipment	0.1
Intercompany transactions	1.8	2.0
Net cash provided by (used in) investing activities	0.5	(0.4)
Net cash provided by (used in) financing activities
Repayment of debt	0.0
Proceeds from issuance of debt	0.0
Repayments on Hawesville term loan	0.0
Borrowing under Hawesville term loan		0.0
Borrowings under revolving credit facilities	45.0	19.5
Repayments under revolving credit facilities	0.0	(19.5)
Debt issuance costs	0.0
Debt retirement costs	0.0
Other short term borrowings		0.0
Repayment on other short-term borrowings		0.0
Issuance of common stock		0.0
Intercompany transactions	(42.1)	(25.1)
Net cash provided by (used in) financing activities	2.9	(25.1)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	41.5	(17.8)
Cash, cash equivalents and restricted cash, beginning of period	38.5	38.8
Cash, cash equivalents and restricted cash, end of period	$ 80.0	$ 21.0

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Subsequent Events (Details)	Oct. 22, 2020
Subsequent Event [Member] | Grundartangi [Member]
Subsequent Event [Line Items]
Labor agreement period	5 years