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Debt 7.5% Notes due May 2014 (Details) (Senior unsecured notes due August 15, 2014 [Member], Long-term Debt [Member], USD $) In Thousands, unless otherwise specified | 1 Months Ended
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Aug. 31, 2004
Senior unsecured notes due August 15, 2014 [Member] | Long-term Debt [Member] |
Debt Instrument [Line Items] |
Proceeds from Issuance of Debt | $ 250,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

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

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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
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration