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Debt 7.5% Notes (Details) (Long-term Debt [Member], Senior secured notes due June 01, 2021 [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jun. 04, 2013
Long-term Debt [Member] | Senior secured notes due June 01, 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 250,000us-gaap_DebtInstrumentFaceAmount / 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

X

- 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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Balance Type:	credit
Period Type:	instant

X

- 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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Balance Type:	na
Period Type:	instant

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- Details

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Balance Type:	na
Period Type:	duration