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Commitments and Contingencies - Other Commitments (Details)	Dec. 31, 2021 labor_union
Loss Contingencies [Line Items]
Percentage of Company's work force represented by a union	63.00%
Percentage of U.S. based work force represented by a union	55.00%
Netherlands
Loss Contingencies [Line Items]
Percentage of Company's 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

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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

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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

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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

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Namespace Prefix:	cenx_
Data Type:	dtr-types:percentItemType
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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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X

- Details

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X

- Details

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