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Debt 7.5% Notes Due 2021 (Details) (Senior secured notes due June 01, 2021 [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 04, 2013
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |
Long-term Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 250,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Proceeds from Issuance of Debt | $ 246,330 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Debt Instrument, Collateral, Equity Interests in Foreign Subsidiaries | 65.00%cenx_DebtInstrumentCollateralEquityInterestsinForeignSubsidiaries / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |

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- Definition The debt instrument is secured by a pledge of and lien on 65% of equity interests in foreign subsidiaries or foreign holding companies directly owned by Century and the guarantors. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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