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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
	Aug. 31, 2004
Senior unsecured notes due August 15, 2014 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 250,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = cenx_SeniorUnsecuredNotesDueAugust152014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember

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- Details

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X

- 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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