General	3 Months Ended
Mar. 31, 2019
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, 2018. 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 three months of 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. 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, 2019, we adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2016-02, "Leases (Topic 842).” See Note 4. Leases for further information regarding our adoption of ASC 842 and impacts to the financial statements. On January 1, 2019, we adopted FASB ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” See Note 8. Income Taxes for further information regarding our adoption of ASU 2018-02. For the quarter ended March 31, 2019, we have adopted the requirements in SEC Final Rule 33-10532 “Disclosure Updates and Simplification.” The adoption of this guidance resulted in presentation of the Consolidated Statements of Shareholders' Equity as part of our quarterly financial statements.

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, 2018. 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 three months of 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. 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, 2019, we adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2016-02, "Leases (Topic 842).” See Note 4. Leases for further information regarding our adoption of ASC 842 and impacts to the financial statements.

On January 1, 2019, we adopted FASB ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” See Note 8. Income Taxes for further information regarding our adoption of ASU 2018-02.

For the quarter ended March 31, 2019, we have adopted the requirements in SEC Final Rule 33-10532 “Disclosure Updates and Simplification.” The adoption of this guidance resulted in presentation of the Consolidated Statements of Shareholders' Equity as part of our quarterly financial statements.