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Supplemental financial statement info Components of Other Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment in BHH and other equity investments | $ 34,478 cenx_OtherAssetInvestmentinBHHandJointventures | $ 35,767 cenx_OtherAssetInvestmentinBHHandJointventures
Pension asset related to Mt. Holly | 30,842 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
Cash surrender value of life insurance and trust assets | 26,636 us-gaap_AssetsHeldInTrustNoncurrent | 27,857 us-gaap_AssetsHeldInTrustNoncurrent
Maintenance and operating supplies – non-current | 17,771 us-gaap_MaterialsSuppliesAndOther | 17,827 us-gaap_MaterialsSuppliesAndOther
Other assets | 13,850 us-gaap_OtherAssetsMiscellaneousNoncurrent | 10,023 us-gaap_OtherAssetsMiscellaneousNoncurrent
Total Other assets | $ 123,577 us-gaap_OtherAssetsNoncurrent | $ 91,474 us-gaap_OtherAssetsNoncurrent

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- Definition Other Asset Investment in BHH and Joint ventures The amount of noncurrent assets reported by an equity method investment of the entity. + References No definition available. + Details
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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The carrying amount of capitalized costs of materials, supplies, and other assets, which are not included in inventory but used in production. + References No definition available. + Details
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- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
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- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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