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Debt - Credit Facility (Details) - USD ($) | Nov. 02, 2021 | Dec. 31, 2021 | Dec. 23, 2021 | Nov. 05, 2021 | Apr. 29, 2019
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U.S revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility face amount |  |  | $ 220,000,000.0 |  |
Letter of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility face amount |  |  | $ 110,000,000 |  |
Hawesville |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Due to related parties |  |  |  |  | $ 40,000,000
Revolving Credit Facility | U.S revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility maximum amount |  | $ 220,000,000.0 |  |  |
Borrowing availability |  | 215,200,000 |  |  |
Outstanding letters of credit issued |  | 81,100,000 |  |  |
Outstanding borrowings |  | 63,600,000 |  |  |
Letter of credit sub-facility amount |  | 70,500,000 |  |  |
U.S. revolving credit facility |  | 63,600,000 |  |  |
Revolving Credit Facility | Iceland revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility maximum amount |  | 50,000,000.0 |  |  |
Outstanding letters of credit issued |  | 0 |  |  |
Outstanding borrowings |  | 50,000,000.0 |  |  |
Borrowing availability, net of outstanding letters of credit and borrowings |  | 0 |  |  |
U.S. revolving credit facility |  | $ 50,000,000.0 |  |  |
Casthouse Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility face amount | $ 130,000,000 |  |  |  |
Outstanding borrowings |  |  |  | $ 0 |
Debt instrument, term | 8 years |  |  |  |
Debt instrument, quarterly installment fee | 1.818% |  |  |  |
Debt instrument, initial payment period after first drawdown of funds | 30 months |  |  |  |
Debt instrument, remaining payment after drawdown of funds | 60.00% |  |  |  |
U.S. revolving credit facility |  |  |  | $ 0 |
Debt instrument, arrangement fee, percentage of facility | 0.78% |  |  |  |
Debt instrument, arrangement fee, paid upfront | 50.00% |  |  |  |
Debt instrument, arrangement fee, paid at end of availability | 50.00% |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage | 0.38% |  |  |  |
Secured Credit Facility | Casthouse Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt | $ 430,000,000 |  |  |  |

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- 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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- Definition Line of Credit Facility, Remaining Borrowing Capacity, Net of Letters of Credit + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- 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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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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