XML 132 R103.htm IDEA: XBRL DOCUMENT v3.24.0.1

Commitments and Contingencies - Other Commitments (Details)	Dec. 31, 2023 laborUnion
Loss Contingencies [Line Items]
Percentage of work force represented by a union	60.00%
Percentage of U.S. based work force represented by a union	42.00%
Percentage of foreign work force represented by union	0.62
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	87.00%
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-types1: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-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage Of Foreign Work Force, Represented By Union

+ References

No definition available.

+ Details

Name:	cenx_PercentageOfForeignWorkForceRepresentedByUnion
Namespace Prefix:	cenx_
Data Type:	xbrli:pureItemType
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-types1: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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

+ Details

Name:	us-gaap_LossContingenciesLineItems
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: