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v2.4.1.9

Debt 7.5% Notes Redemption (Details) (Long-term Debt [Member], Senior secured notes due June 01, 2021 [Member]) | 12 Months Ended
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Dec. 31, 2014
Debt Instrument, Redemption [Line Items] |
Debt Redemptions Rights After Change Of Control | 101.00%cenx_DebtRedemptionsRightsAfterChangeOfControl
Debt Instrument, Redemption, Period One [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Debt Instrument, Redemption, Period Two [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 105.625%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Debt Instrument, Redemption, Period Three [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.75%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Debt Instrument, Redemption, Period Four [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.875%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Debt Instrument, Redemption, Period Five [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_DebtInstrumentAxis = cenx_SeniorsecurednotesdueJune012021Member / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

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- Definition After a change of control, details of effect on note. + References No definition available. + Details
Name: | cenx_DebtRedemptionsRightsAfterChangeOfControl
Namespace Prefix: | cenx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentRedemptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration