10-K Filing

CENTURY ALUMINUM CO CIK: 949157 FY 2017

Filing Information

Form Type	10-K
Accession Number	`0000949157-18-000020`
Period End Date	20171231
Filing Date	20180228
Fiscal Year	2017
Fiscal Period	FY
XBRL Instance	cenx-20171231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 69 Income Statement 110 Cash Flow Statement 118 Stockholders Equity 27 Comprehensive Income 38

Balance Sheet 69 line items

Line Item	Tag	Value	Unit	Period
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$163.24M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$167.21M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$132.40M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$115.39M	USD	Point-in-time
Restricted cash	`RestrictedCashAndCashEquivalents`	$1.05M	USD	Point-in-time
Restricted cash	`RestrictedCashAndCashEquivalents`	$848.00K	USD	Point-in-time
Accounts receivable - net	`AccountsReceivableNetCurrent`	$12.43M	USD	Point-in-time
Accounts receivable - net	`AccountsReceivableNetCurrent`	$43.07M	USD	Point-in-time
Due from affiliates	`DueFromRelatedPartiesCurrent`	$10.37M	USD	Point-in-time
Due from affiliates	`DueFromRelatedPartiesCurrent`	$16.65M	USD	Point-in-time
Inventories	`InventoryNet`	$233.56M	USD	Point-in-time
Inventories	`InventoryNet`	$317.47M	USD	Point-in-time
Prepaid and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$14.71M	USD	Point-in-time
Prepaid and other current assets	`PrepaidExpenseAndOtherAssetsCurrent`	$22.21M	USD	Point-in-time
Assets held for sale	`AssetsHeldForSaleNotPartOfDisposalGroupCurrent`	-	USD	Point-in-time
Assets held for sale	`AssetsHeldForSaleNotPartOfDisposalGroupCurrent`	$22.31M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$553.67M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$440.62M	USD	Point-in-time
Property, plant and equipment - net	`PropertyPlantAndEquipmentNet`	$971.92M	USD	Point-in-time
Property, plant and equipment - net	`PropertyPlantAndEquipmentNet`	$1.03B	USD	Point-in-time
Other assets	`OtherAssetsNoncurrent`	$56.05M	USD	Point-in-time
Other assets	`OtherAssetsNoncurrent`	$73.42M	USD	Point-in-time
TOTAL	`Assets`	$1.58B	USD	Point-in-time
TOTAL	`Assets`	$1.75B	USD	Point-in-time
TOTAL	`Assets`	$1.54B	USD	Point-in-time
Accounts payable, trade	`AccountsPayableTradeCurrent`	$94.96M	USD	Point-in-time
Accounts payable, trade	`AccountsPayableTradeCurrent`	$89.93M	USD	Point-in-time
Due to affiliates	`DueToRelatedPartiesCurrent`	$20.37M	USD	Point-in-time
Due to affiliates	`DueToRelatedPartiesCurrent`	$15.37M	USD	Point-in-time
Accrued and other current liabilities	`AccruedLiabilitiesCurrent`	$50.10M	USD	Point-in-time
Accrued and other current liabilities	`AccruedLiabilitiesCurrent`	$61.40M	USD	Point-in-time
Accrued employee benefits costs	`PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities`	$10.92M	USD	Point-in-time
Accrued employee benefits costs	`PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities`	$11.00M	USD	Point-in-time
Industrial revenue bonds	`IndustrialRevenueBonds`	$7.82M	USD	Point-in-time
Industrial revenue bonds	`IndustrialRevenueBonds`	$7.82M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$179.16M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$190.52M	USD	Point-in-time
Senior notes payable	`SeniorLongTermNotes`	$248.15M	USD	Point-in-time
Senior notes payable	`SeniorLongTermNotes`	$247.70M	USD	Point-in-time
Accrued pension benefits costs - less current portion	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$49.49M	USD	Point-in-time
Accrued pension benefits costs - less current portion	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$38.93M	USD	Point-in-time
Accrued postretirement benefits costs - less current portion	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$126.36M	USD	Point-in-time
Accrued postretirement benefits costs - less current portion	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$113.00M	USD	Point-in-time
Other liabilities	`OtherLiabilitiesNoncurrent`	$72.03M	USD	Point-in-time
Other liabilities	`OtherLiabilitiesNoncurrent`	$57.93M	USD	Point-in-time
Deferred taxes	`DeferredTaxLiabilitiesNoncurrent`	$108.94M	USD	Point-in-time
Deferred taxes	`DeferredTaxLiabilitiesNoncurrent`	$103.48M	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$561.48M	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$604.51M	USD	Point-in-time
COMMITMENTS AND CONTINGENCIES	`CommitmentsAndContingencies`	-	USD	Point-in-time
COMMITMENTS AND CONTINGENCIES	`CommitmentsAndContingencies`	-	USD	Point-in-time
Preferred stock	`PreferredStockValue`	$1.00K	USD	Point-in-time
Preferred stock	`PreferredStockValue`	$1.00K	USD	Point-in-time
Common stock	`CommonStockValue`	$947.00K	USD	Point-in-time
Common stock	`CommonStockValue`	$944.00K	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapital`	$2.52B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapital`	$2.52B	USD	Point-in-time
Treasury stock, at cost	`TreasuryStockValue`	$86.28M	USD	Point-in-time
Treasury stock, at cost	`TreasuryStockValue`	$86.28M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-91.74M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-113.89M	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.56B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.51B	USD	Point-in-time
Total shareholders equity	`StockholdersEquity`	$1.10B	USD	Point-in-time
Total shareholders equity	`StockholdersEquity`	$829.64M	USD	Point-in-time
Total shareholders equity	`StockholdersEquity`	$756.65M	USD	Point-in-time
Total shareholders equity	`StockholdersEquity`	$1.01B	USD	Point-in-time
TOTAL	`LiabilitiesAndStockholdersEquity`	$1.58B	USD	Point-in-time
TOTAL	`LiabilitiesAndStockholdersEquity`	$1.54B	USD	Point-in-time

Income Statement 110 line items

Line Item	Tag	Value	Unit	Period
Related parties	`RevenueFromRelatedParties`	$1.20B	USD	Annual
Related parties	`RevenueFromRelatedParties`	$1.87B	USD	Annual
Related parties	`RevenueFromRelatedParties`	$1.18B	USD	Annual
Other customers	`SalesRevenueGoodsNet`	$391.00M	USD	Annual
Other customers	`SalesRevenueGoodsNet`	$82.15M	USD	Annual
Other customers	`SalesRevenueGoodsNet`	$140.46M	USD	Annual
Total net sales	`SalesRevenueNet`	$318.85M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$1.32B	USD	Annual
Total net sales	`SalesRevenueNet`	$1.95B	USD	Annual
Total net sales	`SalesRevenueNet`	$326.75M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$388.80M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$339.84M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$400.64M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$433.85M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$333.65M	USD	1 Quarter
Total net sales	`SalesRevenueNet`	$1.59B	USD	Annual
Total net sales	`SalesRevenueNet`	$365.79M	USD	1 Quarter
Cost of goods sold	`CostOfGoodsSold`	$1.33B	USD	Annual
Cost of goods sold	`CostOfGoodsSold`	$1.46B	USD	Annual
Cost of goods sold	`CostOfGoodsSold`	$1.91B	USD	Annual
Gross profit (loss)	`GrossProfit`	$5.06M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$128.60M	USD	Annual
Gross profit (loss)	`GrossProfit`	$47.89M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$-17.61M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$-3.05M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$16.85M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$-11.04M	USD	Annual
Gross profit (loss)	`GrossProfit`	$22.46M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$5.58M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$41.40M	USD	1 Quarter
Gross profit (loss)	`GrossProfit`	$41.31M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$42.12M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$45.45M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$40.26M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	$7.31M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	$-152.22M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	-	USD	Annual
Ravenswood (gains)	`GainLossRelatedtoLitigationSettlementAndLitigationExpenses`	$-30.85M	USD	Annual
Ravenswood (gains)	`GainLossRelatedtoLitigationSettlementAndLitigationExpenses`	$-26.83M	USD	Annual
Ravenswood (gains)	`GainLossRelatedtoLitigationSettlementAndLitigationExpenses`	$5.50M	USD	Annual
Other operating expense - net	`OtherOperatingIncomeExpenseNet`	$-2.11M	USD	Annual
Other operating expense - net	`OtherOperatingIncomeExpenseNet`	$-3.86M	USD	Annual
Other operating expense - net	`OtherOperatingIncomeExpenseNet`	$-7.44M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$93.86M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$-39.09M	USD	Annual
Operating income (loss)	`OperatingIncomeLoss`	$-234.21M	USD	Annual
Interest expense	`InterestExpense`	$22.17M	USD	Annual
Interest expense	`InterestExpense`	$21.95M	USD	Annual
Interest expense	`InterestExpense`	$22.22M	USD	Annual
Interest income	`InterestIncomeOther`	$1.40M	USD	Annual
Interest income	`InterestIncomeOther`	$339.00K	USD	Annual
Interest income	`InterestIncomeOther`	$758.00K	USD	Annual
Net (loss) gain on forward and derivative contracts	`GainLossOnDerivativeInstrumentsNetPretax`	$-16.55M	USD	Annual
Net (loss) gain on forward and derivative contracts	`GainLossOnDerivativeInstrumentsNetPretax`	$3.49M	USD	Annual
Net (loss) gain on forward and derivative contracts	`GainLossOnDerivativeInstrumentsNetPretax`	$1.60M	USD	Annual
Net (loss) gain on forward and derivative contracts	`GainLossOnDerivativeInstrumentsNetPretax`	$-16.14M	USD	1 Quarter
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	-	USD	Annual
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	-	USD	Annual
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	$18.34M	USD	Annual
Other (expense) income - net	`OtherNonoperatingIncomeExpense`	$-1.16M	USD	Annual
Other (expense) income - net	`OtherNonoperatingIncomeExpense`	$1.32M	USD	Annual
Other (expense) income - net	`OtherNonoperatingIncomeExpense`	$-356.00K	USD	Annual
Income (loss) before income taxes and equity in earnings of joint ventures	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-41.12M	USD	Annual
Income (loss) before income taxes and equity in earnings of joint ventures	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-250.87M	USD	Annual
Income (loss) before income taxes and equity in earnings of joint ventures	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$55.37M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$9.28M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$7.58M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$2.82M	USD	Annual
Income (loss) before equity in earnings of joint ventures	`IncomeLossAfterIncomeTaxesBeforeIncomeLossFromEquityMethodInvestments`	$-50.40M	USD	Annual
Income (loss) before equity in earnings of joint ventures	`IncomeLossAfterIncomeTaxesBeforeIncomeLossFromEquityMethodInvestments`	$47.79M	USD	Annual
Income (loss) before equity in earnings of joint ventures	`IncomeLossAfterIncomeTaxesBeforeIncomeLossFromEquityMethodInvestments`	$-253.69M	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	-	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	-	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	$11.58M	USD	Annual
Equity in earnings of joint ventures	`IncomeLossFromEquityMethodInvestments`	$1.27M	USD	Annual
Equity in earnings of joint ventures	`IncomeLossFromEquityMethodInvestments`	$792.00K	USD	Annual
Equity in earnings of joint ventures	`IncomeLossFromEquityMethodInvestments`	$2.67M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$20.78M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$48.58M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-58.27M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$35.80M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-9.52M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$7.13M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-59.31M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-16.16M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-252.41M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-15.14M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-168.46M	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$-0.11	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$0.38	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$0.22	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$0.51	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$-0.67	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$-0.68	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$-1.93	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$0.08	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$-0.17	USD	1 Quarter
Basic (in dollars per share)	`EarningsPerShareBasic`	$-2.90	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$-0.19	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-2.90	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-0.19	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-0.17	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$0.22	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$0.37	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-0.67	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-0.11	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-0.68	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$0.07	USD	1 Quarter
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$0.51	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$-1.93	USD	1 Quarter

Cash Flow Statement 118 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`NetIncomeLoss`	$20.78M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$48.58M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-58.27M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$35.80M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-9.52M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$7.13M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-59.31M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-16.16M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-252.41M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-15.14M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-168.46M	USD	1 Quarter
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	-	USD	Annual
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	-	USD	Annual
Unrealized gain on fair value of contingent consideration	`BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized`	$18.34M	USD	Annual
Unrealized gain on contingent obligation	`UnrealizedGainLossonContingentObligation`	$1.41M	USD	Annual
Unrealized gain on contingent obligation	`UnrealizedGainLossonContingentObligation`	$1.41M	USD	Annual
Unrealized gain on contingent obligation	`UnrealizedGainLossonContingentObligation`	$1.41M	USD	Annual
Lower of cost or NRV inventory adjustment	`InventoryWriteDown`	$-660.00K	USD	Annual
Lower of cost or NRV inventory adjustment	`InventoryWriteDown`	$7.54M	USD	Annual
Lower of cost or NRV inventory adjustment	`InventoryWriteDown`	$-1.07M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$80.12M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$84.25M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$84.78M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	$7.31M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	$-152.22M	USD	Annual
Helguvik (gains) losses	`GainLossRelatedProjectTerminationIncludingAssetImpairment`	-	USD	Annual
Ravenswood (gains) losses	`GainLossRelatedToLitigationSettlement`	$-30.85M	USD	Annual
Ravenswood (gains) losses	`GainLossRelatedToLitigationSettlement`	$5.50M	USD	Annual
Ravenswood (gains) losses	`GainLossRelatedToLitigationSettlement`	$-3.83M	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	-	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	-	USD	Annual
BHH impairment	`EquityMethodInvestmentOtherThanTemporaryImpairment`	$11.58M	USD	Annual
Pension and other postretirement benefits	`PensionAndOtherPostretirementBenefitExpense`	$-4.99M	USD	Annual
Pension and other postretirement benefits	`PensionAndOtherPostretirementBenefitExpense`	$-1.77M	USD	Annual
Pension and other postretirement benefits	`PensionAndOtherPostretirementBenefitExpense`	$2.86M	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$893.00K	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$178.00K	USD	Annual
Deferred income taxes	`IncreaseDecreaseInDeferredIncomeTaxes`	$4.61M	USD	Annual
Stock-based compensation	`ShareBasedCompensation`	$1.85M	USD	Annual
Stock-based compensation	`ShareBasedCompensation`	$1.84M	USD	Annual
Stock-based compensation	`ShareBasedCompensation`	$1.50M	USD	Annual
Other non-cash items - net	`OtherOperatingActivitiesCashFlowStatement`	$-792.00K	USD	Annual
Other non-cash items - net	`OtherOperatingActivitiesCashFlowStatement`	$-806.00K	USD	Annual
Other non-cash items - net	`OtherOperatingActivitiesCashFlowStatement`	$-367.00K	USD	Annual
Accounts receivable - net	`IncreaseDecreaseInAccountsReceivable`	$30.64M	USD	Annual
Accounts receivable - net	`IncreaseDecreaseInAccountsReceivable`	$-68.19M	USD	Annual
Accounts receivable - net	`IncreaseDecreaseInAccountsReceivable`	$2.96M	USD	Annual
Due from affiliates	`IncreaseDecreaseInDueFromRelatedPartiesCurrent`	$-14.09M	USD	Annual
Due from affiliates	`IncreaseDecreaseInDueFromRelatedPartiesCurrent`	$-766.00K	USD	Annual
Due from affiliates	`IncreaseDecreaseInDueFromRelatedPartiesCurrent`	$-6.29M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-919.00K	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$67.53M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-44.90M	USD	Annual
Prepaid and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-7.80M	USD	Annual
Prepaid and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$144.00K	USD	Annual
Prepaid and other current assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-18.31M	USD	Annual
Accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$2.27M	USD	Annual
Accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$4.75M	USD	Annual
Accounts payable, trade	`IncreaseDecreaseInAccountsPayableTrade`	$-60.58M	USD	Annual
Due to affiliates	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$-12.22M	USD	Annual
Due to affiliates	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$4.83M	USD	Annual
Due to affiliates	`IncreaseDecreaseInDueToRelatedPartiesCurrent`	$7.21M	USD	Annual
Accrued and other current liabilities	`IncreaseDecreaseInAccruedLiabilities`	$14.48M	USD	Annual
Accrued and other current liabilities	`IncreaseDecreaseInAccruedLiabilities`	$-3.90M	USD	Annual
Accrued and other current liabilities	`IncreaseDecreaseInAccruedLiabilities`	$-31.54M	USD	Annual
Pension contribution - Mt. Holly	`PensionContributions`	$34.59M	USD	Annual
Pension contribution - Mt. Holly	`PensionContributions`	-	USD	Annual
Pension contribution - Mt. Holly	`PensionContributions`	-	USD	Annual
Ravenswood retiree legal settlement	`IncreaseDecreaseinEstimatedLitigationLiability`	$23.00M	USD	Annual
Ravenswood retiree legal settlement	`IncreaseDecreaseinEstimatedLitigationLiability`	-	USD	Annual
Ravenswood retiree legal settlement	`IncreaseDecreaseinEstimatedLitigationLiability`	$-5.00M	USD	Annual
Other - net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$3.13M	USD	Annual
Other - net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-4.58M	USD	Annual
Other - net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-3.10M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$31.87M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$38.17M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$51.76M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$54.70M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$31.84M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$21.94M	USD	Annual
Purchase of remaining interest in Mt. Holly smelter	`PaymentsforProceedsfromAcquisitionofRemainingInterestinBusinessGross`	-	USD	Annual
Purchase of remaining interest in Mt. Holly smelter	`PaymentsforProceedsfromAcquisitionofRemainingInterestinBusinessGross`	-	USD	Annual
Purchase of remaining interest in Mt. Holly smelter	`PaymentsforProceedsfromAcquisitionofRemainingInterestinBusinessGross`	$-11.31M	USD	Annual
Proceeds from sale of property, plant and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$1.04M	USD	Annual
Proceeds from sale of property, plant and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$14.48M	USD	Annual
Proceeds from sale of property, plant and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$14.00K	USD	Annual
Restricted and other cash deposits	`IncreaseDecreaseInRestrictedCash`	$-10.00K	USD	Annual
Restricted and other cash deposits	`IncreaseDecreaseInRestrictedCash`	-	USD	Annual
Restricted and other cash deposits	`IncreaseDecreaseInRestrictedCash`	$259.00K	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-21.16M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-17.36M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-43.36M	USD	Annual
Borrowings under revolving credit facilities	`ProceedsFromLinesOfCredit`	$1.28M	USD	Annual
Borrowings under revolving credit facilities	`ProceedsFromLinesOfCredit`	$1.74M	USD	Annual
Borrowings under revolving credit facilities	`ProceedsFromLinesOfCredit`	$1.18M	USD	Annual
Repayments under revolving credit facilities	`RepaymentsOfLinesOfCredit`	$1.28M	USD	Annual
Repayments under revolving credit facilities	`RepaymentsOfLinesOfCredit`	$1.18M	USD	Annual
Repayments under revolving credit facilities	`RepaymentsOfLinesOfCredit`	$1.74M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$404.00K	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	$36.35M	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$404.00K	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-36.35M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	-	USD	Annual
CHANGE IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$34.81M	USD	Annual
CHANGE IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$17.01M	USD	Annual
CHANGE IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-47.85M	USD	Annual
Cash and cash equivalents, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$163.24M	USD	Point-in-time
Cash and cash equivalents, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$167.21M	USD	Point-in-time
Cash and cash equivalents, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$132.40M	USD	Point-in-time
Cash and cash equivalents, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$115.39M	USD	Point-in-time
Cash and cash equivalents, end of period	`CashAndCashEquivalentsAtCarryingValue`	$163.24M	USD	Point-in-time
Cash and cash equivalents, end of period	`CashAndCashEquivalentsAtCarryingValue`	$167.21M	USD	Point-in-time
Cash and cash equivalents, end of period	`CashAndCashEquivalentsAtCarryingValue`	$132.40M	USD	Point-in-time
Cash and cash equivalents, end of period	`CashAndCashEquivalentsAtCarryingValue`	$115.39M	USD	Point-in-time

Stockholders Equity 27 line items

Line Item	Tag	Value	Unit	Period
Balance, start	`StockholdersEquity`	$1.10B	USD	Point-in-time
Balance, start	`StockholdersEquity`	$829.64M	USD	Point-in-time
Balance, start	`StockholdersEquity`	$756.65M	USD	Point-in-time
Balance, start	`StockholdersEquity`	$1.01B	USD	Point-in-time
Net income (loss)	`NetIncomeLoss`	$20.78M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$48.58M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-58.27M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$35.80M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-9.52M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$7.13M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-59.31M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-16.16M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-252.41M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-15.14M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-168.46M	USD	1 Quarter
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$-1.24M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$5.03M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossNetOfTax`	$22.15M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$36.35M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$86.28M	USD	28 Qtrs
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$1.50M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$3.37M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$2.26M	USD	Annual
Balance, end	`StockholdersEquity`	$1.10B	USD	Point-in-time
Balance, end	`StockholdersEquity`	$829.64M	USD	Point-in-time
Balance, end	`StockholdersEquity`	$756.65M	USD	Point-in-time
Balance, end	`StockholdersEquity`	$1.01B	USD	Point-in-time

Comprehensive Income 38 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`NetIncomeLoss`	$20.78M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$48.58M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-58.27M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$35.80M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-9.52M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$7.13M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-59.31M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-16.16M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-252.41M	USD	Annual
Net income (loss)	`NetIncomeLoss`	$-15.14M	USD	1 Quarter
Net income (loss)	`NetIncomeLoss`	$-168.46M	USD	1 Quarter
Foreign currency cash flow hedges reclassified to net income (loss)	`ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet`	$-186.00K	USD	Annual
Foreign currency cash flow hedges reclassified to net income (loss)	`ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet`	$4.29M	USD	Annual
Foreign currency cash flow hedges reclassified to net income (loss)	`ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet`	$-186.00K	USD	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax`	$-7.19M	USD	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax`	$-9.52M	USD	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax`	$5.55M	USD	Annual
Prior service benefit arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax`	$-1.76M	USD	Annual
Prior service benefit arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax`	-	USD	Annual
Prior service benefit arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax`	$-27.40M	USD	Annual
Amortization of prior service benefit during the period	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax`	$-8.35M	USD	Annual
Amortization of prior service benefit during the period	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax`	$-2.67M	USD	Annual
Amortization of prior service benefit during the period	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax`	$-4.95M	USD	Annual
Amortization of net loss during the period	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax`	$-7.79M	USD	Annual
Amortization of net loss during the period	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax`	$-8.19M	USD	Annual
Amortization of net loss during the period	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax`	$-8.61M	USD	Annual
Other comprehensive income (loss) before income tax effect	`OtherComprehensiveIncomeLossBeforeTax`	$288.00K	USD	Annual
Other comprehensive income (loss) before income tax effect	`OtherComprehensiveIncomeLossBeforeTax`	$6.57M	USD	Annual
Other comprehensive income (loss) before income tax effect	`OtherComprehensiveIncomeLossBeforeTax`	$23.68M	USD	Annual
Income tax effect	`OtherComprehensiveIncomeLossTax`	$1.54M	USD	Annual
Income tax effect	`OtherComprehensiveIncomeLossTax`	$1.53M	USD	Annual
Income tax effect	`OtherComprehensiveIncomeLossTax`	$1.53M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-1.24M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$5.03M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$22.15M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-253.66M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$70.73M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-54.28M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.