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Commitments and Contingencies - Other Commitments (Details) | Dec. 31, 2022 laborUnion
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Loss Contingencies [Line Items] |
Percentage of work force represented by a union | 59.00%
Percentage of U.S. based work force represented by a union | 43.00%
Netherlands |
Loss Contingencies [Line Items] |
Percentage of work force represented by a union | 100.00%
Grundartangi - Landsvirkjun |
Loss Contingencies [Line Items] |
Percentage of foreign work force covered under new labor agreement | 86.00%
Number of labor unions under new agreement | 5

X
- Definition The number of labor unions representing a group of employees. + References No definition available. + Details
Name: | cenx_NumberOfLaborUnionsUnderNewLaborAgreement
Namespace Prefix: | cenx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of a Company's work force, based in the country of domicile, that are subject to collective bargaining agreements. + References No definition available. + Details
Name: | cenx_PercentageOfDomesticWorkForceInUnion
Namespace Prefix: | cenx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of a Company's Icelandic work force that are subject to collective bargaining agreements. + References No definition available. + Details
Name: | cenx_PercentageOfForeignWorkForceCoveredUnderNewLaborAgreement
Namespace Prefix: | cenx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of a Company's work force that are subject to collective bargaining agreements. + References No definition available. + Details
Name: | cenx_PercentageofWorkForceinUnion
Namespace Prefix: | cenx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_NL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=cenx_GrundartangiLandsvirkjunMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |