$KALU
KAISER ALUMINUM CORP Stock $kalu

$kalu Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000156459022008034 Filed on March 01, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$806.4M	$2.622B	$272.0M
YoY Change	196.47%	123.59%	-26.23%
Cost Of Revenue	$734.5M	$2.348B	$221.8M
YoY Change	231.15%	149.45%	-25.57%
Gross Profit	$71.90M	$273.9M	$50.20M
YoY Change	43.23%	18.37%	-29.0%
Gross Profit Margin	8.92%	10.45%	18.46%
Selling, General & Admin	$26.30M	$92.80M	$23.30M
YoY Change	12.88%	13.03%	4.48%
% of Gross Profit	36.58%	33.88%	46.41%
Research & Development		$9.300M
YoY Change		2.2%
% of Gross Profit		3.4%
Depreciation & Amortization	$27.30M	$91.50M	$13.10M
YoY Change	108.4%	75.29%	2.34%
% of Gross Profit	37.97%	33.41%	26.1%
Operating Expenses	$53.60M	$9.300M	$36.60M
YoY Change	46.45%	2.2%	1.95%
Operating Profit	$18.30M	$264.6M	$13.60M
YoY Change	34.56%	19.03%	41.67%
Interest Expense	-$12.50M	-$49.50M	-$11.90M
YoY Change	5.04%	-221.03%	108.77%
% of Operating Profit	-68.31%	-18.71%	-87.5%
Other Income/Expense, Net	-$500.0K	-$38.90M	-$900.0K
YoY Change	-44.44%	2678.57%	-43.75%
Pretax Income	$3.600M	-$24.00M	$5.700M
YoY Change	-36.84%	-161.86%	-131.67%
Income Tax	$1.900M	-$5.500M	-$200.0K
% Of Pretax Income	52.78%		-3.51%
Net Earnings	$1.700M	-$18.50M	$5.900M
YoY Change	-71.19%	-164.24%	-155.66%
Net Earnings / Revenue	0.21%	-0.71%	2.17%
Basic Earnings Per Share		-$1.17
Diluted Earnings Per Share	$107.2K	-$1.17	$371.1K
COMMON SHARES
Basic Shares Outstanding		15.84M
Diluted Shares Outstanding		15.84M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$303.2M	$303.2M	$780.3M
YoY Change	-61.14%	-61.14%	127.49%
Cash & Equivalents	$303.2M	$303.2M	$780.3M
Short-Term Investments			$0.00
Other Short-Term Assets	$48.70M	$48.70M	$28.60M
YoY Change	70.28%	70.28%	47.42%
Inventory	$404.6M	$404.6M	$152.0M
Prepaid Expenses
Receivables	$332.7M	$395.9M	$112.8M
Other Receivables	$53.00M	$53.00M	$11.60M
Total Short-Term Assets	$1.205B	$1.205B	$1.121B
YoY Change	7.49%	7.49%	43.81%
LONG-TERM ASSETS
Property, Plant & Equipment	$955.2M	$997.6M	$627.2M
YoY Change	52.3%	53.01%	0.84%
Goodwill	$39.30M		$18.80M
YoY Change	109.04%		0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$105.2M	$112.4M	$44.10M
YoY Change	138.55%	145.41%	14.84%
Total Long-Term Assets	$1.217B	$1.217B	$743.3M
YoY Change	63.73%	63.73%	-0.42%
TOTAL ASSETS
Total Short-Term Assets	$1.205B	$1.205B	$1.121B
Total Long-Term Assets	$1.217B	$1.217B	$743.3M
Total Assets	$2.422B	$2.422B	$1.865B
YoY Change	29.91%	29.91%	22.18%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$351.4M	$351.4M	$86.10M
YoY Change	308.13%	308.13%	-6.41%
Accrued Expenses	$93.70M	$93.70M	$65.10M
YoY Change	43.93%	43.93%	-8.31%
Deferred Revenue	$0.00		$0.00
YoY Change			-100.0%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$2.100M	$2.100M	$1.900M
YoY Change	10.53%	10.53%	58.33%
Total Short-Term Liabilities	$456.7M	$456.7M	$158.3M
YoY Change	188.5%	188.5%	-7.1%
LONG-TERM LIABILITIES
Long-Term Debt	$1.036B	$1.042B	$838.1M
YoY Change	23.65%	23.46%	70.14%
Other Long-Term Liabilities	$72.50M	$220.3M	$77.30M
YoY Change	-6.21%	90.24%	15.37%
Total Long-Term Liabilities	$1.109B	$1.263B	$915.4M
YoY Change	21.13%	31.52%	63.58%
TOTAL LIABILITIES
Total Short-Term Liabilities	$456.7M	$456.7M	$158.3M
Total Long-Term Liabilities	$1.109B	$1.263B	$915.4M
Total Liabilities	$1.730B	$1.730B	$1.132B
YoY Change	52.78%	52.78%	42.91%
SHAREHOLDERS EQUITY
Retained Earnings	$93.00M		$158.2M
YoY Change	-41.21%		-8.45%
Common Stock	$1.079B		$1.069B
YoY Change	0.96%		0.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$475.9M		$475.9M
YoY Change	0.0%		2.7%
Treasury Stock Shares	$6.835M		$6.835M
Shareholders Equity	$692.5M	$692.5M	$732.4M
YoY Change
Total Liabilities & Shareholders Equity	$2.422B	$2.422B	$1.865B
YoY Change	29.91%	29.91%	22.18%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$1.700M	-$18.50M	$5.900M
YoY Change	-71.19%	-164.24%	-155.66%
Depreciation, Depletion And Amortization	$27.30M	$91.50M	$13.10M
YoY Change	108.4%	75.29%	2.34%
Cash From Operating Activities	$46.10M	$79.40M	$56.20M
YoY Change	-17.97%	-61.62%	-28.32%
INVESTING ACTIVITIES
Capital Expenditures	-$637.3M	-$667.2M	-$14.70M
YoY Change	4235.37%	1185.55%	-24.62%
Acquisitions		$609.2M
YoY Change
Other Investing Activities	$611.0M	$1.400M	$0.00
YoY Change		-98.22%	-100.0%
Cash From Investing Activities	-$26.30M	-$665.8M	-$14.70M
YoY Change	78.91%	-2575.09%	-79.72%
FINANCING ACTIVITIES
Cash Dividend Paid		$46.70M
YoY Change		7.6%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-12.30M	109.1M	-11.30M
YoY Change	8.85%	-61.3%	-113.11%
NET CHANGE
Cash From Operating Activities	46.10M	79.40M	56.20M
Cash From Investing Activities	-26.30M	-665.8M	-14.70M
Cash From Financing Activities	-12.30M	109.1M	-11.30M
Net Change In Cash	7.500M	-477.3M	30.20M
YoY Change	-75.17%	-192.55%	-67.21%
FREE CASH FLOW
Cash From Operating Activities	$46.10M	$79.40M	$56.20M
Capital Expenditures	-$637.3M	-$667.2M	-$14.70M
Free Cash Flow	$683.4M	$746.6M	$70.90M
YoY Change	863.89%	188.49%	-27.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021	us-gaap	Accounts Receivable Sale AccountsReceivableSale	1102800000
CY2021	us-gaap	Lessee Operating Lease Existence Of Option To Extend LesseeOperatingLeaseExistenceOfOptionToExtend	true
CY2021	us-gaap	Lessee Operating Lease Existence Of Option To Terminate LesseeOperatingLeaseExistenceOfOptionToTerminate	true
CY2021	kalu	Expected Period Related To Remediation Expenditures For Environmental Contingencies Period ExpectedPeriodRelatedToRemediationExpendituresForEnvironmentalContingenciesPeriod	P30Y
CY2021	us-gaap	Operating Loss Carryforwards Expiration Date OperatingLossCarryforwardsExpirationDate	2030-12-31
CY2021	us-gaap	Accounts Receivable Sale AccountsReceivableSale	1102800000
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P26Y1M6D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y4M24D
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentNet
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentNet
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAccruedLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAccruedLiabilitiesCurrent
CY2021Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAccruedLiabilitiesCurrent
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAccruedLiabilitiesCurrent
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	332700000
CY2021	dei	Auditor Firm AuditorFirmId	34
CY2021	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2021	dei	Auditor Location AuditorLocation	Costa Mesa, California
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	303200000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	780300000
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	112800000
CY2021Q4	us-gaap	Other Receivables OtherReceivables	53000000.0
CY2020Q4	us-gaap	Other Receivables OtherReceivables	11600000
CY2021Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	63200000
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	36100000
CY2021Q4	us-gaap	Inventory Net InventoryNet	404600000
CY2020Q4	us-gaap	Inventory Net InventoryNet	152000000.0
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	48700000
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	28600000
CY2021Q4	us-gaap	Assets Current AssetsCurrent	1205400000
CY2020Q4	us-gaap	Assets Current AssetsCurrent	1121400000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	955200000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	627200000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	46200000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26500000
CY2021Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	3400000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	67700000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	26700000
CY2021Q4	us-gaap	Goodwill Goodwill	39300000
CY2020Q4	us-gaap	Goodwill Goodwill	18800000
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	105200000
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	44100000
CY2021Q4	us-gaap	Assets Assets	2422400000
CY2020Q4	us-gaap	Assets Assets	1864700000
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	351400000
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	86100000
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	46900000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9500000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	28800000
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	30800000
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	58400000
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	41400000
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	456700000
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	158300000
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	40800000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	25600000
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	92500000
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1300000
CY2021Q4	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	20600000
CY2020Q4	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	17800000
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	10500000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	13900000
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	72500000
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	77300000
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1036300000
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	838100000
CY2021Q4	us-gaap	Liabilities Liabilities	1729900000
CY2020Q4	us-gaap	Liabilities Liabilities	1132300000
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	90000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	22700404
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CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	22647455
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15812169
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	200000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	200000
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1078900000
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1068600000
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	93000000.0
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	158200000
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6835286
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6835286
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	475900000
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	475900000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3700000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-18700000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	692500000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	732400000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2422400000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1864700000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2622000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1172700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1514100000
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2348100000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	1388400000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	1091600000
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	941300000
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1215200000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	91500000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	52200000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	49100000
CY2021	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	118800000
CY2020	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	91200000
CY2019	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	98000000.0
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	25200000
CY2021	kalu	Restructuring Benefit Costs RestructuringBenefitCosts	-800000
CY2020	kalu	Restructuring Benefit Costs RestructuringBenefitCosts	7500000
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	600000
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-900000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	125700000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-18500000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.17
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.82
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.17
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.83
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15836000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15802000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15997000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15836000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15913000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16203000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-18500000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	28800000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	62000000.0
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CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-300000
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CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	6200000
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	42900000
CY2019	us-gaap	Dividends Cash DividendsCash	39400000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	733900000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	19900000
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	400000
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4300000
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	12500000
CY2020	us-gaap	Dividends Cash DividendsCash	43400000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9600000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	732400000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-18500000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	15000000.0
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	300000
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2600000
CY2020	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	81.94
CY2021Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	93100000
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.88
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.68
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.40
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-18500000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	28800000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	62000000.0
CY2021	us-gaap	Depreciation Depreciation	82500000
CY2020	us-gaap	Depreciation Depreciation	49300000
CY2019	us-gaap	Depreciation Depreciation	46300000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9000000.0
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2900000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2100000
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2000000.0
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1200000
CY2021	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-11400000
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	15200000
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	21100000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	12900000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	10000000.0
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	9800000
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	500000
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	26100000
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	17300000
CY2019	kalu	Increase Decrease In Noncurrent Assets And Liabilities Net IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet	-6000000.0
CY2021	us-gaap	Gain Loss On Repurchase Of Debt Instrument GainLossOnRepurchaseOfDebtInstrument	-35900000
CY2019	us-gaap	Gain Loss On Repurchase Of Debt Instrument GainLossOnRepurchaseOfDebtInstrument	-20300000
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	500000
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-200000
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	700000
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	900000
CY2021	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	9400000
CY2020	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	5200000
CY2019	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	7000000.0
CY2021	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	90300000
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-60800000
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-20200000
CY2021	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	27100000
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-18500000
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-300000
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	43500000
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-25600000
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-37500000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	900000
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	6800000
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4200000
CY2021	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	112500000
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-5900000
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-24500000
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-600000
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-5000000.0
CY2021	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	1700000
CY2020	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	2900000
CY2019	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	2100000
CY2021	kalu	Increase Decrease In Noncurrent Assets And Liabilities Net IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet	8300000
CY2020	kalu	Increase Decrease In Noncurrent Assets And Liabilities Net IncreaseDecreaseInNoncurrentAssetsAndLiabilitiesNet	-4800000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	79400000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	206900000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	232300000
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	58000000.0
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	51900000
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	60200000
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	39100000
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	132200000
CY2021	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	400000
CY2020	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	500000
CY2019	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	700000
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	118100000
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	91100000
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	609200000
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	300000
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	200000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-665800000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	26900000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-101800000
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8600000
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	6200000
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8800000
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6200000
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	44200000
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	46700000
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	43400000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	109100000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	794300000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2100000
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1700000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1400000
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2600000
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4300000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	12500000
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	39400000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	281900000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	8500000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-477300000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	515700000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	139000000.0
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	278600000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139600000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	317000000.0
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	794300000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	278600000
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="margin-top:12pt;margin-bottom:0pt;text-indent:4.54%;font-style:italic;font-family:Times New Roman;font-size:10pt;font-weight:normal;text-transform:none;font-variant: normal;">Use of Estimates in the Preparation of Financial Statements.<span style="font-style:normal;"> The preparation of financial statements in accordance with GAAP requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities known to exist as of the date the financial statements are published and the reported amounts of revenues and expenses during the reporting period. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of our consolidated financial statements; accordingly, it is possible that the actual results could differ from these estimates and assumptions, which could have a material effect on the reported amounts of our consolidated financial position and results of operations. The severity, magnitude and duration, as well as the economic consequences of the Coronavirus Disease 2019 (“COVID-19”) pandemic, are uncertain, rapidly changing and difficult to predict. Therefore, our accounting estimates and assumptions may change over time in response to the COVID-19 pandemic and may change materially in future periods.</span></p>
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	300000
CY2021Q4	kalu	Discount Fees Recognized DiscountFeesRecognized	6200000
CY2021Q4	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	137100000
CY2020Q4	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	8400000
CY2021	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	200000
CY2021	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1200000
CY2020	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1000000.0
CY2019	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1600000
CY2021	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P9Y
CY2021	us-gaap	Hosting Arrangement Service Contract Implementation Cost Expense Amortization HostingArrangementServiceContractImplementationCostExpenseAmortization	100000
CY2020	us-gaap	Hosting Arrangement Service Contract Implementation Cost Expense Amortization HostingArrangementServiceContractImplementationCostExpenseAmortization	0
CY2020Q4	kalu	Workers Compensation Charges WorkersCompensationCharges	600000
CY2021Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	9000000.0
CY2021	us-gaap	Advertising Expense AdvertisingExpense	100000
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	9300000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	800000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	800000
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	332700000
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	112800000
CY2021Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	90300000
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	37200000
CY2021Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	162200000
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	46000000.0
CY2021Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	143000000.0
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	62300000
CY2021Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	9100000
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	6500000
CY2021Q4	us-gaap	Inventory Net InventoryNet	404600000
CY2020Q4	us-gaap	Inventory Net InventoryNet	152000000.0
CY2021Q4	us-gaap	Land Land	26000000.0
CY2020Q4	us-gaap	Land Land	21500000
CY2021Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	179000000.0
CY2020Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	117200000
CY2021Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	1151500000
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	847400000
CY2021Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	75300000
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	37800000
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1431800000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1023900000
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	480400000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	398400000
CY2021Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	3800000
CY2020Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	1700000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	955200000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	627200000
CY2021Q4	us-gaap	Bank Overdrafts BankOverdrafts	10900000
CY2020Q4	us-gaap	Bank Overdrafts BankOverdrafts	2100000
CY2021Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	9500000
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	5200000
CY2020Q4	kalu	Accrued Annual Veba Contribution AccruedAnnualVebaContribution	1700000
CY2021Q4	us-gaap	Interest Payable Current InterestPayableCurrent	9900000
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	11600000
CY2021Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	2600000
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	3700000
CY2021Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	25500000
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	17100000
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	58400000
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	41400000
CY2021Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	31900000
CY2020Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	30600000
CY2021Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	14200000
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	15100000
CY2021Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	26400000
CY2020Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	31600000
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	72500000
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	77300000
CY2021Q4	kalu	Construction In Progress Temporarily Idled ConstructionInProgressTemporarilyIdled	24900000
CY2020Q4	kalu	Construction In Progress Temporarily Idled ConstructionInProgressTemporarilyIdled	20000000.0
CY2021Q4	us-gaap	Lessee Finance Lease Renewal Term1 LesseeFinanceLeaseRenewalTerm1	P60Y
CY2021	kalu	Lessee Operating Lease Optionto Terminate Duration LesseeOperatingLeaseOptiontoTerminateDuration	P1Y
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.034
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	46200000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26500000
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	8200000
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	8100000
CY2021Q4	kalu	Lease Right Of Use Asset LeaseRightOfUseAsset	54400000
CY2020Q4	kalu	Lease Right Of Use Asset LeaseRightOfUseAsset	34600000
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	9000000.0
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4400000
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2100000
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1900000
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	40800000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	25600000
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	6100000
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	6200000
CY2021Q4	kalu	Lease Liability LeaseLiability	58000000.0
CY2020Q4	kalu	Lease Liability LeaseLiability	38100000
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	11000000.0
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	6800000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	7500000
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3200000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1600000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1200000
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2100000
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1600000
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1500000
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	300000
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	300000
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	300000
CY2021	us-gaap	Lease Cost LeaseCost	16600000
CY2020	us-gaap	Lease Cost LeaseCost	10300000
CY2019	us-gaap	Lease Cost LeaseCost	10500000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2300000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	9400000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2000000.0
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9800000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1400000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	9100000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1000000.0
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	5900000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	700000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4000000.0
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	5700000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	20700000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	13100000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	58900000
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4900000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	9100000
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	8200000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	49800000
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	25200000
CY2020Q4	us-gaap	Goodwill Goodwill	18800000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	93900000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	26200000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	67700000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	43900000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	17200000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	26700000
CY2021	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2936800000
CY2020	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2256300000
CY2021	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	800000
CY2020	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-35700000
CY2020Q4	us-gaap	Goodwill Gross GoodwillGross	37200000
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	37200000
CY2021Q4	us-gaap	Goodwill Gross GoodwillGross	57700000
CY2020Q4	us-gaap	Goodwill Gross GoodwillGross	37200000
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	18400000
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	18400000
CY2021Q4	us-gaap	Goodwill Goodwill	39300000
CY2019Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	25200000
CY2020	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2019	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2021	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9000000.0
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2900000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	13900000
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8300000
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8800000
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	700000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12400000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5300000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4500000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4500000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4500000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	36500000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	67700000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	9500000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	10100000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	10600000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	11000000.0
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	11300000
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	63200000
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	1500000
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	1600000
CY2021	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	5000000.0
CY2020	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	4900000
CY2019	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	5000000.0
CY2021	kalu	Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans	29000000.0
CY2020	kalu	Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans	19900000
CY2019	kalu	Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans	22400000
CY2021Q4	kalu	Multiemployer Plans Collective Bargaining Arrangement Percentage Of Employers Participants To All Employees MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees	0.35
CY2021	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	5000000.0
CY2020	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	4900000
CY2019	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	5000000.0
CY2021	kalu	Green Zone Funding Percentage Minimum GreenZoneFundingPercentageMinimum	0.80
CY2021	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Under Collective Bargaining Arrangement To Total Employer Contribution Percentage MultiemployerPlanPensionSignificantEmployerContributionUnderCollectiveBargainingArrangementToTotalEmployerContributionPercentage	0.05
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	716496
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12600000
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9600000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9700000
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000.0
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2300000
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2400000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	9700000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	12400000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	16400000
CY2020Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	0
CY2021Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	0
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	0
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-300000
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6700000
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6500000
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6300000
CY2021	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	100000
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	100000
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	200000
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	600000
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	500000
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	500000
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	200000
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	100000
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	7200000
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6700000
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6500000
CY2019	kalu	Adjustment To Accretion Expense Impact On Earnings Per Share Basic And Diluted AdjustmentToAccretionExpenseImpactOnEarningsPerShareBasicAndDiluted	0.01
CY2020	kalu	Adjustment To Accretion Expense Impact On Earnings Per Share Basic And Diluted AdjustmentToAccretionExpenseImpactOnEarningsPerShareBasicAndDiluted	0.01
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	18700000
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17000000.0
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	16900000
CY2021	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	100000
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	5200000
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	1800000
CY2021	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	2000000.0
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	3500000
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	1700000
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	16800000
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	18700000
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17000000.0
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	16800000
CY2021Q4	us-gaap	Loss Contingency Range Of Possible Loss Portion Not Accrued LossContingencyRangeOfPossibleLossPortionNotAccrued	11600000
CY2021	kalu	Time Period Within Which Recorded Estimate Of Its Obligation May Change TimePeriodWithinWhichRecordedEstimateOfItsObligationMayChange	P12M
CY2021	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	21600000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	1400000
CY2020	kalu	Restructuring Charges Gross RestructuringChargesGross	12400000
CY2021	us-gaap	Payments For Restructuring PaymentsForRestructuring	600000
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	6100000
CY2021	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	-800000
CY2020	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	-4900000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	1400000
CY2021	us-gaap	Investment Income Interest InvestmentIncomeInterest	200000
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	600000
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	600000
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	4100000
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	4700000
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	6500000
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2000000.0
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	4400000
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-200000
CY2020	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	700000
CY2019	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	700000
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-35900000
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-20300000
CY2021	kalu	Other Nonoperating Income Expense Net OtherNonoperatingIncomeExpenseNet	1100000
CY2019	kalu	Other Nonoperating Income Expense Net OtherNonoperatingIncomeExpenseNet	400000
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-38900000
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1400000
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-20700000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-30200000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	35200000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	76300000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	6200000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	3600000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4100000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-24000000.0
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	38800000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	80400000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2400000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3500000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5900000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2100000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-500000
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	11200000
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	1500000
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5700000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18400000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4200000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-6800000
CY2021	kalu	Federal Income Tax Provision Benefit Other FederalIncomeTaxProvisionBenefitOther	-3700000
CY2021	kalu	Foreign Income Tax Provision Benefit Other ForeignIncomeTaxProvisionBenefitOther	-300000
CY2021	kalu	State Income Tax Provision Benefit Other StateIncomeTaxProvisionBenefitOther	-600000
CY2021	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-4600000
CY2021	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-5800000
CY2021	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	1600000
CY2021	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	-1300000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5500000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-6100000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	400000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	600000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-5100000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	18800000
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	100000
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2300000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21200000
CY2020	kalu	Federal Income Tax Provision Benefit Other FederalIncomeTaxProvisionBenefitOther	-5100000
CY2020	kalu	Foreign Income Tax Provision Benefit Other ForeignIncomeTaxProvisionBenefitOther	100000
CY2020	kalu	State Income Tax Provision Benefit Other StateIncomeTaxProvisionBenefitOther	-1100000
CY2020	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-6100000
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	7600000
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	600000
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	1800000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10000000.0
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-5700000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1100000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1800000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2800000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19600000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	300000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4500000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24400000
CY2019	kalu	Federal Income Tax Provision Benefit Other FederalIncomeTaxProvisionBenefitOther	-2700000
CY2019	kalu	Foreign Income Tax Provision Benefit Other ForeignIncomeTaxProvisionBenefitOther	100000
CY2019	kalu	State Income Tax Provision Benefit Other StateIncomeTaxProvisionBenefitOther	-600000
CY2019	us-gaap	Other Income Tax Expense Benefit Continuing Operations OtherIncomeTaxExpenseBenefitContinuingOperations	-3200000
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-5000000.0
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	8100000
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	16900000
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-200000
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	100000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	500000
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1100000
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1700000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	200000
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-400000
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-100000
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000.0
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1500000
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-4500000
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	600000
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	400000
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	7700000
CY2021	kalu	Effective Income Tax Rate Reconciliation Tax Contingency Current Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationTaxContingencyCurrentYearTaxPositionsAmount	0
CY2020	kalu	Effective Income Tax Rate Reconciliation Tax Contingency Current Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationTaxContingencyCurrentYearTaxPositionsAmount	0
CY2019	kalu	Effective Income Tax Rate Reconciliation Tax Contingency Current Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationTaxContingencyCurrentYearTaxPositionsAmount	300000
CY2021	kalu	Effective Income Tax Rate Reconciliation Change In Tax Contingency Prior Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationChangeInTaxContingencyPriorYearTaxPositionsAmount	0
CY2020	kalu	Effective Income Tax Rate Reconciliation Change In Tax Contingency Prior Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationChangeInTaxContingencyPriorYearTaxPositionsAmount	-400000
CY2019	kalu	Effective Income Tax Rate Reconciliation Change In Tax Contingency Prior Year Tax Positions Amount EffectiveIncomeTaxRateReconciliationChangeInTaxContingencyPriorYearTaxPositionsAmount	2400000
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	300000
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	400000
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	100000
CY2021	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	300000
CY2020	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	100000
CY2019	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	200000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5500000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10000000.0
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18400000
CY2021Q4	kalu	Deferred Tax Assets Operating Loss Carryforwards And Tax Credits DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits	51500000
CY2020Q4	kalu	Deferred Tax Assets Operating Loss Carryforwards And Tax Credits DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCredits	33400000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7100000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	4800000
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	29000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	29400000
CY2021Q4	kalu	Deferred Tax Assets Leased Assets DeferredTaxAssetsLeasedAssets	11700000
CY2020Q4	kalu	Deferred Tax Assets Leased Assets DeferredTaxAssetsLeasedAssets	7300000
CY2021Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	50400000
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	6900000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	4600000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6400000
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	145100000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	75400000
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	138900000
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	80800000
CY2021Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	10900000
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	6400000
CY2021Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	2400000
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	2100000
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	152200000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	89300000
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	7100000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	13900000
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	187100000
CY2021	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-1800000
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-3500000
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	1500000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3800000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1500000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	300000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	100000
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	300000
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.17
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	400000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2300000
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.88
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	213000
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	44000
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	us-gaap	Interest Paid Net InterestPaidNet	48700000
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	400000
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	100000
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3800000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4100000
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	300000
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	300000
CY2021Q4	kalu	Accrued Interest And Penalty On Unrecognized Tax Benefits Current AccruedInterestAndPenaltyOnUnrecognizedTaxBenefitsCurrent	0
CY2020Q4	kalu	Accrued Interest And Penalty On Unrecognized Tax Benefits Current AccruedInterestAndPenaltyOnUnrecognizedTaxBenefitsCurrent	0
CY2019Q4	us-gaap	Income Tax Examination Increase Decrease In Liability From Prior Year IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear	100000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-18500000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	28800000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	62000000.0
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15836000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15802000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15997000
CY2020	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	111000
CY2019	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	206000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15836000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15913000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16203000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.17
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.82
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.83
CY2020	us-gaap	Interest Paid Net InterestPaidNet	29400000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	23600000
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14000000.0
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4500000
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4500000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	27800000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5400000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1800000
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	8200000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	4500000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3800000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	2200000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	3200000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1000000.0
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	303200000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	780300000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	264300000
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	300000
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	13800000
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	14000000.0
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	14000000.0
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	317000000.0
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	794300000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	278600000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2622000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1172700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1514100000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2622000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1172700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1514100000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2622000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1172700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1514100000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	5600000
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	1000000.0
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	5500000
CY2021Q4	us-gaap	Noncurrent Assets NoncurrentAssets	955200000
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	627200000
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	622000000.0

Files In Submission

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$KALU
KAISER ALUMINUM CORP Stock $kalu

2021 Q4 Form 10-K Financial Statement

#000156459022008034 Filed on March 01, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KALU KAISER ALUMINUM CORP Stock $kalu

2021 Q4 Form 10-K Financial Statement

#000156459022008034 Filed on March 01, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KALU
KAISER ALUMINUM CORP Stock $kalu