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v3.22.4

Subsequent Events (Details) - Subsequent Event - Mt. Holly $ in Millions | Feb. 17, 2023 USD ($) a
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Subsequent Event [Line Items] |
Area of land | a | 133
Commitment to sell land held-for-use | $ | $ 28.5

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- Definition Commitment to Sell Land Held-for-Use + References No definition available. + Details
Name: | cenx_CommitmentToSellLandHeldForUse
Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=cenx_Mt.HollyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |