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Debt Principal payments on long term debt (Details) (Long-term Debt [Member], USD $) | Dec. 31, 2014
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Long-term Debt [Member] |
Debt Instrument [Line Items] |
Principal payments on long term debt during next 5 years | $ 0 cenx_LongTermDebtMaturitiesRepaymentsOfPrincipalDuringNext5Years / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing during the next 5 fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | cenx_LongTermDebtMaturitiesRepaymentsOfPrincipalDuringNext5Years
Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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