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General	6 Months Ended
	Jun. 30, 2021
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, 2020. 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 six months of 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. 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 Adopted Accounting Standards On January 1, 2021, we adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes." The ASU 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. The adoption of the ASU did not have a material effect on the Company’s consolidated financial statements. On January 1, 2021, we adopted FASB ASU 2020-06, “Debt With Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity" using the modified retrospective method. The ASU amendments include simplification of the accounting models for convertible instruments and conversion options, and amendments to diluted earnings per share (“EPS”) calculations for certain convertible instruments, requiring the inclusion of convertible securities in the calculation of diluted EPS using the if-converted method. The adoption of the ASU did not have a material effect on the Company’s consolidated financial statements. On January 1, 2021, we adopted the final rule issued by the Securities and Exchange Commission (“SEC”) that amends the disclosure requirements related to issuers and guarantors of certain registered securities under SEC Regulation S-X Rule 3-10. We presented the alternative financial disclosures in Item 2. Management's Discussion and Analysis - Liquidity and Capital Resources. The adoption of the SEC rule is limited to disclosures only and did not have a material effect on the Company’s consolidated financial statements.

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- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-URI http://asc.fasb.org/topic&trid=2197479

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