Debt Instrument, Convertible, Amount Exceeding Principal

No definition available.

Name:	cenx_DebtInstrumentConvertibleAmountExceedingPrincipal
Namespace Prefix:	cenx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Convertible, Threshold Consecutive Trading Days, Term

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Convertible, Threshold Trading Days, Term

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Credit Spread Adjustment

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Redemption Period

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Term Extension

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Variable Interest Rate

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Variable Interest Rate, Maximum Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt Offer To Purchase Percentage Of Outstanding Amount

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The amount of additional borrowings provided in credit facility under a letter of credit sub-facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

Face (par) amount of debt instrument at time of issuance.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- 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/2009/role/commonPracticeRef
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

+ Details

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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Debt - Narrative (Details)				3 Months Ended
Debt - Narrative (Details)	Jul. 22, 2025 USD ($)	Oct. 01, 2024 USD ($)	Apr. 09, 2021 USD ($) $ / shares	Mar. 31, 2026 USD ($)	Jun. 14, 2022 USD ($)
Senior Secured Notes, 6.875% \| Senior notes
Line of Credit Facility [Line Items]
Stated interest rate, percentage	6.875%			6.875%
Face amount	$ 400,000,000.0
Proceeds from issuance of Senior Notes due 2032	$ 393,700,000
Redemption price, percentage				100.00%
Redemption period				12 months
Percentage of outstanding amount, offer to purchase				101.00%
Senior Secured Notes, 6.875% \| Senior notes \| Level 2
Line of Credit Facility [Line Items]
Fair value of debt instrument				$ 413,700,000
Senior convertible notes, 2.75% \| Senior notes
Line of Credit Facility [Line Items]
Stated interest rate, percentage			2.75%	2.75%
Face amount			$ 86,300,000
Percentage of principal amount redeemed			100.00%	100.00%
Proceeds from convertible debt			$ 83,700,000
Conversion ratio			0.0533547
Conversion price (in dollars per share) \| $ / shares			$ 18.74
Debt instrument, convertible, threshold percentage of stock price trigger				130.00%
Debt instrument, trading days, term				20 days
Debt instrument, consecutive trading days, term				30 days
Value exceeding principal amount				$ 158,800,000
Senior convertible notes, 2.75% \| Senior notes \| Level 2
Line of Credit Facility [Line Items]
Fair value of debt instrument				$ 270,900,000
U.S. revolving credit facility \| U.S. revolving credit facility
Line of Credit Facility [Line Items]
Stated interest rate, percentage				7.25%
Credit facility maximum amount					$ 250,000,000.0
Credit spread adjustment	0.10%
Outstanding borrowings				$ 0
Outstanding letters of credit issued				$ 47,900,000
U.S. revolving credit facility \| Letter of credit
Line of Credit Facility [Line Items]
Letter of credit sub-facility amount					$ 150,000,000.0
U.S. revolving credit facility \| Foreign line of credit
Line of Credit Facility [Line Items]
Stated interest rate, percentage				7.18%
Credit facility maximum amount				$ 100,000,000.0
Outstanding borrowings				66,000,000.0
Outstanding letters of credit issued				0
Vlissingen Credit Facility \| Foreign line of credit
Line of Credit Facility [Line Items]
Credit facility maximum amount		$ 90,000,000.0
Term extension		2 years
Secured debt				$ 0
Debt instrument, basis spread on variable rate		3.687%
Vlissingen Credit Facility \| Foreign line of credit \| Maximum
Line of Credit Facility [Line Items]
Variable interest rate		9.00%
Vlissingen Credit Facility \| Foreign line of credit \| Minimum
Line of Credit Facility [Line Items]
Variable interest rate		7.00%
Industrial revenue bonds
Line of Credit Facility [Line Items]
Maximum variable interest rate				12.00%
Surety Bond
Line of Credit Facility [Line Items]
Loss contingency accrual				$ 6,600,000