$KALU
KAISER ALUMINUM CORP Stock $kalu

$kalu Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-Q Financial Statement

#000081159618000053 Filed on October 25, 2018

Income Statement

Concept	2018 Q4	2018 Q3	2017 Q3
Revenue	$389.4M	$393.1M	$332.8M
YoY Change	10.28%	18.12%	3.81%
Cost Of Revenue	$317.3M	$323.3M	$256.4M
YoY Change	14.47%	26.09%	0.67%
Gross Profit	$72.10M	$69.80M	$76.40M
YoY Change	-5.01%	-8.64%	12.52%
Gross Profit Margin	18.52%	17.76%	22.96%
Selling, General & Admin	$22.40M	$23.90M	$24.70M
YoY Change	-1.75%	-3.24%	-3.52%
% of Gross Profit	31.07%	34.24%	32.33%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$11.50M	$11.00M	$10.20M
YoY Change	10.58%	7.84%	13.33%
% of Gross Profit	15.95%	15.76%	13.35%
Operating Expenses	$35.20M	$34.90M	$36.10M
YoY Change	15.03%	-3.32%	-5.25%
Operating Profit	$36.90M	$34.90M	$41.50M
YoY Change	-11.93%	-15.9%	39.26%
Interest Expense	-$4.000M	$5.700M	$5.300M
YoY Change	-78.26%	7.55%	-3.64%
% of Operating Profit	-10.84%	16.33%	12.77%
Other Income/Expense, Net	-$2.900M	$700.0K	-$200.0K
YoY Change	-35.56%	-450.0%
Pretax Income	$30.00M	$29.90M	$36.00M
YoY Change	-15.73%	-16.94%	48.15%
Income Tax	$6.300M	$8.200M	$16.10M
% Of Pretax Income	21.0%	27.42%	44.72%
Net Earnings	$23.60M	$21.70M	$19.90M
YoY Change	-255.26%	9.05%	33.56%
Net Earnings / Revenue	6.06%	5.52%	5.98%
Basic Earnings Per Share	$1.44	$1.31	$1.18
Diluted Earnings Per Share	$1.41	$1.29	$1.16
COMMON SHARES
Basic Shares Outstanding	16.50M shares	16.57M shares	16.83M shares
Diluted Shares Outstanding		16.78M shares	17.16M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$162.3M	$182.7M	$265.3M
YoY Change	-30.88%	-31.13%	-3.14%
Cash & Equivalents	$125.6M	$94.30M	$73.90M
Short-Term Investments	$36.70M	$159.5M	$248.0M
Other Short-Term Assets	$18.90M	$24.20M	$31.50M
YoY Change	-43.41%	-23.17%	188.99%
Inventory	$215.1M	$196.2M	$212.2M
Prepaid Expenses
Receivables	$179.8M	$194.5M	$138.2M
Other Receivables	$25.60M	$24.40M	$15.40M
Total Short-Term Assets	$656.6M	$673.0M	$662.6M
YoY Change	0.0%	1.57%	0.71%
LONG-TERM ASSETS
Property, Plant & Equipment	$611.8M	$595.4M	$557.8M
YoY Change	7.07%	6.74%	7.56%
Goodwill	$44.00M	$43.40M	$18.80M
YoY Change	134.04%	130.85%	-49.46%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$38.60M	$39.00M	$39.50M
YoY Change	-6.76%	-1.27%	78.73%
Total Long-Term Assets	$762.7M	$753.0M	$760.1M
YoY Change	4.68%	-0.93%	-1.99%
TOTAL ASSETS
Total Short-Term Assets	$656.6M	$673.0M	$662.6M
Total Long-Term Assets	$762.7M	$753.0M	$760.1M
Total Assets	$1.419B	$1.426B	$1.423B
YoY Change	2.46%	0.23%	-0.75%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$121.4M	$120.4M	$94.40M
YoY Change	34.89%	27.54%	35.63%
Accrued Expenses	$77.60M	$63.90M	$73.30M
YoY Change	1.7%	-12.82%	-6.98%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$205.5M	$192.5M	$176.7M
YoY Change	18.72%	8.94%	10.99%
LONG-TERM LIABILITIES
Long-Term Debt	$370.4M	$370.2M	$369.4M
YoY Change	0.22%	0.22%	0.24%
Other Long-Term Liabilities	$66.40M	$25.80M	$20.80M
YoY Change	10.67%	24.04%	511.76%
Total Long-Term Liabilities	$436.8M	$396.0M	$390.2M
YoY Change	1.68%	1.49%	4.92%
TOTAL LIABILITIES
Total Short-Term Liabilities	$205.5M	$192.5M	$176.7M
Total Long-Term Liabilities	$436.8M	$396.0M	$390.2M
Total Liabilities	$678.9M	$663.5M	$639.1M
YoY Change	6.26%	3.82%	3.2%
SHAREHOLDERS EQUITY
Retained Earnings	$150.2M	$135.6M	$109.0M
YoY Change	75.67%	24.4%	85.69%
Common Stock	$1.060B	$1.058B	$1.053B
YoY Change	0.32%	0.44%	0.81%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$420.5M	$390.9M	$345.7M
YoY Change	17.26%	13.07%	32.81%
Treasury Stock Shares	6.237M shares	5.924M shares	5.488M shares
Shareholders Equity	$740.4M	$762.5M	$783.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.419B	$1.426B	$1.423B
YoY Change	2.46%	0.23%	-0.75%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2017 Q3
OPERATING ACTIVITIES
Net Income	$23.60M	$21.70M	$19.90M
YoY Change	-255.26%	9.05%	33.56%
Depreciation, Depletion And Amortization	$11.50M	$11.00M	$10.20M
YoY Change	10.58%	7.84%	13.33%
Cash From Operating Activities	$37.70M	$28.50M	$58.40M
YoY Change	277.0%	-51.2%	69.28%
INVESTING ACTIVITIES
Capital Expenditures	-$20.90M	-$60.60M	-$16.40M
YoY Change	7.73%	269.51%	8.61%
Acquisitions
YoY Change
Other Investing Activities	$51.90M	-$15.20M	-$14.40M
YoY Change	532.93%	5.56%	-88.81%
Cash From Investing Activities	$31.00M	-$75.80M	-$30.80M
YoY Change	-376.79%	146.1%	-78.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-38.20M	-22.40M	-10.90M
YoY Change	76.85%	105.5%	-16.79%
NET CHANGE
Cash From Operating Activities	37.70M	28.50M	58.40M
Cash From Investing Activities	31.00M	-75.80M	-30.80M
Cash From Financing Activities	-38.20M	-22.40M	-10.90M
Net Change In Cash	30.50M	-69.70M	16.70M
YoY Change	-233.77%	-517.37%	-113.64%
FREE CASH FLOW
Cash From Operating Activities	$37.70M	$28.50M	$58.40M
Capital Expenditures	-$20.90M	-$60.60M	-$16.40M
Free Cash Flow	$58.60M	$89.10M	$74.80M
YoY Change	99.32%	19.12%	50.81%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	22471628	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	16773586	shares
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	16547237	shares
CY2017Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	0	USD
CY2017Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	0	USD
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2018Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
	dei	Document Period End Date DocumentPeriodEndDate	2018-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000811596
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	Kaiser Aluminum Corp
	dei	Entity Small Business EntitySmallBusiness	false
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
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CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	90000000	shares
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	90000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5619951	shares
CY2018Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	5924391	shares
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1500000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	400000	USD
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CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	94300000	USD
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CY2018Q3	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	88400000	USD
CY2017Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	183700000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	194500000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	165000000.0	USD
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CY2017Q4	us-gaap	Other Receivables OtherReceivables	15500000	USD
CY2018Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	51000000.0	USD
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CY2018Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	24200000	USD
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CY2018Q3	us-gaap	Goodwill Goodwill	43400000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	18800000	USD
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CY2018Q3	us-gaap	Assets Assets	1426000000.0	USD
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CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	35100000	USD
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CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	37000000.0	USD
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CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	192500000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	173100000	USD
CY2018Q3	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	31800000	USD
CY2017Q4	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	31900000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	4300000	USD
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CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	369600000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	663500000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	638900000	USD
CY2018Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
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CY2017Q4	us-gaap	Common Stock Value CommonStockValue	200000	USD
CY2018Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1057400000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1055900000	USD
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CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	390900000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	358600000	USD
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CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	762500000	USD
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CY2018Q3	us-gaap	Revenues Revenues	393100000	USD
CY2017Q3	us-gaap	Revenues Revenues	332800000	USD
	us-gaap	Revenues Revenues	1196500000	USD
	us-gaap	Revenues Revenues	1044400000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	323300000	USD
CY2017Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	256400000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	983400000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	808700000	USD
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	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	32400000	USD
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CY2017Q3	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	24700000	USD
	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	73900000	USD
	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	74700000	USD
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CY2017Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
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	us-gaap	Costs And Expenses CostsAndExpenses	1089800000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	931100000	USD
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	us-gaap	Operating Income Loss OperatingIncomeLoss	106700000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	113300000	USD
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CY2017Q3	us-gaap	Interest Expense InterestExpense	5300000	USD
	us-gaap	Interest Expense InterestExpense	17000000.0	USD
	us-gaap	Interest Expense InterestExpense	16400000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	700000	USD
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-200000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	300000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	500000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	90000000.0	USD
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21900000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36800000	USD
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	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60600000	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
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	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
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	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16882000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17363000	shares
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.55
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	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.65
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CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
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	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60600000	USD
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CY2017Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-800000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3500000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-2500000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-200000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	300000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-500000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	600000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-1700000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	400000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-5700000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	700000	USD
CY2018Q3	kalu	Other Comprehensive Income Loss Other OtherComprehensiveIncomeLossOther	0	USD
CY2017Q3	kalu	Other Comprehensive Income Loss Other OtherComprehensiveIncomeLossOther	100000	USD
	kalu	Other Comprehensive Income Loss Other OtherComprehensiveIncomeLossOther	0	USD
	kalu	Other Comprehensive Income Loss Other OtherComprehensiveIncomeLossOther	200000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-800000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1600000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2700000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4000000.0	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20900000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21500000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65400000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64600000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	746300000	USD
CY2017Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	10100000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1 StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	756400000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2700000	USD
	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	200000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	6900000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	32300000	USD
	us-gaap	Dividends Cash DividendsCash	28500000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8200000	USD
	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	100000	USD
	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	18400000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	200000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	400000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	4600000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3400000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-15600000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	14800000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	35700000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	4000000.0	USD
	us-gaap	Increase Decrease In Contract Receivables Net IncreaseDecreaseInContractReceivablesNet	-4600000	USD
	us-gaap	Increase Decrease In Contract Receivables Net IncreaseDecreaseInContractReceivablesNet	0	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25600000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	762500000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60600000	USD
	us-gaap	Depreciation Depreciation	31300000	USD
	us-gaap	Depreciation Depreciation	28300000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	800000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	900000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	27400000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	38600000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	8400000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	10100000	USD
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	2400000	USD
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	1800000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10600000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1600000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1800000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	31100000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	21600000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-1000000.0	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	900000	USD
	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	15700000	USD
	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	20000000.0	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-1600000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-1100000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	112500000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	131500000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	53100000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	56100000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	111900000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	196000000.0	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	900000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	0	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	208700000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	237200000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	43300000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	600000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	600000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	100000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-14300000	USD
	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	500000	USD
	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	200000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6900000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4500000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	31900000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	66700000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	28500000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	26400000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67800000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-97800000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	44800000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	19400000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	64300000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67700000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109100000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	87100000	USD
	us-gaap	Use Of Estimates UseOfEstimates	Use of Estimates in the Preparation of Financial Statements. 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.
CY2018Q3	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	42900000	USD
CY2017Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	24300000	USD
CY2018Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	400000	USD
CY2017Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	700000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1900000	USD
CY2018Q3	kalu	Workerscompensationliabilityundiscounted Workerscompensationliabilityundiscounted	27900000	USD
CY2017Q4	kalu	Workerscompensationliabilityundiscounted Workerscompensationliabilityundiscounted	24800000	USD
	us-gaap	Workers Compensation Discount Percent WorkersCompensationDiscountPercent	0.0300
CY2017	us-gaap	Workers Compensation Discount Percent WorkersCompensationDiscountPercent	0.0225
CY2018Q3	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	3100000	USD
CY2017Q4	us-gaap	Accrued Employee Benefits Current And Noncurrent AccruedEmployeeBenefitsCurrentAndNoncurrent	3500000	USD
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	577300	shares
CY2018Q3	us-gaap	Cash Cash	23200000	USD
CY2017Q4	us-gaap	Cash Cash	23500000	USD
CY2018Q3	us-gaap	Commercial Paper At Carrying Value CommercialPaperAtCarryingValue	71100000	USD
CY2017Q4	us-gaap	Commercial Paper At Carrying Value CommercialPaperAtCarryingValue	27600000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	94300000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	51100000	USD
CY2018Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	195700000	USD
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	166200000	USD
CY2018Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1200000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1200000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	194500000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	165000000.0	USD
CY2018Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	41400000	USD
CY2017Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	63800000	USD
CY2018Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	73300000	USD
CY2017Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	78300000	USD
CY2018Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	76200000	USD
CY2017Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	61300000	USD
CY2018Q3	us-gaap	Other Inventory Supplies OtherInventorySupplies	5300000	USD
CY2017Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	4500000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	196200000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	207900000	USD
CY2018Q3	us-gaap	Land Land	21400000	USD
CY2017Q4	us-gaap	Land Land	21100000	USD
CY2018Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	96400000	USD
CY2017Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	92100000	USD
CY2018Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	736300000	USD
CY2017Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	689100000	USD
CY2018Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	38100000	USD
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	35100000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	892200000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	837400000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	298400000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	267900000	USD
CY2018Q3	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	1600000	USD
CY2017Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	1900000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	595400000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	571400000	USD
CY2018Q3	us-gaap	Bank Overdrafts BankOverdrafts	5600000	USD
CY2017Q4	us-gaap	Bank Overdrafts BankOverdrafts	7300000	USD
CY2018Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	8200000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	6800000	USD
CY2018Q3	kalu	Accrued Annual Veba Contribution AccruedAnnualVebaContribution	0	USD
CY2017Q4	kalu	Accrued Annual Veba Contribution AccruedAnnualVebaContribution	15700000	USD
CY2018Q3	us-gaap	Interest Payable Current InterestPayableCurrent	8400000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2900000	USD
CY2018Q3	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	14800000	USD
CY2017Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	7800000	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	37000000.0	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	40500000	USD
CY2018Q3	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	24500000	USD
CY2017Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	22600000	USD
CY2018Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	14400000	USD
CY2017Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	15800000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	25800000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	21600000	USD
CY2018Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	64700000	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	60000000.0	USD
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	37200000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	24600000	USD
CY2018Q3	us-gaap	Goodwill Gross GoodwillGross	61800000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	18400000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	18400000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	18800000	USD
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	24600000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	43400000	USD
	kalu	Period Over Which Goodwill Deductiblefor Tax PeriodOverWhichGoodwillDeductibleforTax	P15Y
CY2017Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	18400000	USD
CY2018Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-100000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	300000	USD
CY2018Q3	us-gaap	Margin Deposit Assets MarginDepositAssets	0	USD
CY2018Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	0	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	323300000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	983400000	USD
CY2017Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	256400000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	808700000	USD
	us-gaap	Debt Instrument Term DebtInstrumentTerm	P12M
CY2018Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	4800000	USD
CY2018Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17200000	USD
	kalu	Expected Period Related To Remediation Expenditures For Environmental Contingencies Period ExpectedPeriodRelatedToRemediationExpendituresForEnvironmentalContingenciesPeriod	P30Y
CY2018Q3	us-gaap	Loss Contingency Range Of Possible Loss Portion Not Accrued LossContingencyRangeOfPossibleLossPortionNotAccrued	11600000	USD
CY2018Q3	kalu	Time Period Within Which Companys Recorded Estimate Of Its Obligation May Change TimePeriodWithinWhichCompanysRecordedEstimateOfItsObligationMayChange	P12M
CY2018Q3	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-4400000	USD
CY2018Q1	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	55600000	USD
CY2018Q1	us-gaap	Inventory Net InventoryNet	167200000	USD
CY2018Q1	us-gaap	Assets Current AssetsCurrent	671500000	USD
CY2018Q1	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	68700000	USD
CY2018Q1	us-gaap	Assets Assets	1396800000	USD
CY2018Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	42000000.0	USD
CY2018Q1	us-gaap	Liabilities Current LiabilitiesCurrent	174600000	USD
CY2018Q1	us-gaap	Liabilities Liabilities	640400000	USD
CY2018Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	95600000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	756400000	USD
CY2018Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1396800000	USD
CY2018Q1	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	5000000.0	USD
CY2018Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	51000000.0	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	196200000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	673000000.0	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	42200000	USD
CY2018Q3	us-gaap	Assets Assets	1426000000.0	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	37000000.0	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	192500000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	663500000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	135600000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	762500000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1426000000.0	USD
CY2018Q3	us-gaap	Revenues Revenues	393100000	USD
	us-gaap	Revenues Revenues	1196500000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	323300000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	983400000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	34900000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	106700000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29900000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	90000000.0	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8200000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21900000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.09
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.03
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20900000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65400000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Increase Decrease In Contract Receivables Net IncreaseDecreaseInContractReceivablesNet	-4600000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25600000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-1000000.0	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	112500000	USD
CY2018Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	100000	USD
CY2017Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	0	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	200000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	0	USD
CY2018Q3	kalu	Defined Benefit Plan Net Periodic Cost Benefit Veb As DefinedBenefitPlanNetPeriodicCostBenefitVEBAs	1400000	USD
CY2017Q3	kalu	Defined Benefit Plan Net Periodic Cost Benefit Veb As DefinedBenefitPlanNetPeriodicCostBenefitVEBAs	1200000	USD
	kalu	Defined Benefit Plan Net Periodic Cost Benefit Veb As DefinedBenefitPlanNetPeriodicCostBenefitVEBAs	4500000	USD
	kalu	Defined Benefit Plan Net Periodic Cost Benefit Veb As DefinedBenefitPlanNetPeriodicCostBenefitVEBAs	3400000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	0	USD
CY2017Q3	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	-500000	USD
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	0	USD
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	800000	USD
CY2018Q3	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	1600000	USD
CY2017Q3	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	800000	USD
	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	4700000	USD
	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	2200000	USD
CY2018Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	400000	USD
CY2017Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	700000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-100000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	900000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	700000	USD
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-200000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	300000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	500000	USD
CY2018Q3	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	7500000	USD
CY2017Q3	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	15700000	USD
	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	20500000	USD
	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	35800000	USD
CY2018Q3	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	700000	USD
CY2017Q3	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	400000	USD
	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	1400000	USD
	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	1000000.0	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8200000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16100000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21900000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36800000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8200000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16100000	USD
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.273
CY2017Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.447
CY2018Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	600000	USD
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.019
CY2018Q3	kalu	Effective Income Tax Rate Reconciliation Advance Pricing Agreement Amount EffectiveIncomeTaxRateReconciliationAdvancePricingAgreementAmount	300000	USD
CY2018Q3	kalu	Effective Income Tax Rate Reconciliation Advance Pricing Agreement Percent EffectiveIncomeTaxRateReconciliationAdvancePricingAgreementPercent	0.010
CY2018Q3	kalu	Effective Income Tax Rate Reconciliation Sequestrationof Amt Credits Amount EffectiveIncomeTaxRateReconciliationSequestrationofAMTCreditsAmount	200000	USD
CY2018Q3	kalu	Effective Income Tax Rate Reconciliation Sequestrationof Amt Credits Percent EffectiveIncomeTaxRateReconciliationSequestrationofAMTCreditsPercent	0.007
CY2018Q3	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	-400000	USD
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies State And Local EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal	-0.013
CY2017Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2500000	USD
CY2017Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.071
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21900000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36800000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.243
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.378
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-2000000.0	USD
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.023
	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	-900000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies State And Local EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal	-0.010
	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1700000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.019
	kalu	Effective Income Tax Rate Reconciliation Sequestrationof Amt Credits Amount EffectiveIncomeTaxRateReconciliationSequestrationofAMTCreditsAmount	600000	USD
	kalu	Effective Income Tax Rate Reconciliation Sequestrationof Amt Credits Percent EffectiveIncomeTaxRateReconciliationSequestrationofAMTCreditsPercent	0.006
	kalu	Effective Income Tax Rate Reconciliation Advance Pricing Agreement Amount EffectiveIncomeTaxRateReconciliationAdvancePricingAgreementAmount	300000	USD
	kalu	Effective Income Tax Rate Reconciliation Advance Pricing Agreement Percent EffectiveIncomeTaxRateReconciliationAdvancePricingAgreementPercent	0.003
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-1700000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.017
	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	-500000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies State And Local EffectiveIncomeTaxRateReconciliationTaxContingenciesStateAndLocal	-0.006
	kalu	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefit Amount EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefitAmount	-200000	USD
	kalu	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefit Percent EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefitPercent	-0.002
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2500000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.026
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1500000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	400000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	19900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60600000	USD
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16573000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16834000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16654000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17072000	shares
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	210000	shares
CY2017Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	326000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	228000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	291000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16783000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17160000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16882000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17363000	shares
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.03
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.49
CY2017Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3000	shares
CY2018Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Payments Of Dividends PaymentsOfDividends	28500000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	26400000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	304440	shares
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	806307	shares
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	106.00
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	80.60
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	32300000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	64900000	USD
CY2018Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	100000000.0	shares
CY2018Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	178300000	USD
	us-gaap	Interest Paid Net InterestPaidNet	10600000	USD
	us-gaap	Interest Paid Net InterestPaidNet	10000000.0	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5800000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3400000	USD
	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	400000	USD
	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	300000	USD
	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	300000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	94300000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	73900000	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	300000	USD
CY2017Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	300000	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	14500000	USD
CY2017Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	12900000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109100000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	87100000	USD
CY2018Q3	kalu	Percentageof Employees Coveredby Collective Bargaining Agreements PercentageofEmployeesCoveredbyCollectiveBargainingAgreements	0.61
CY2018Q3	kalu	Percentageof Employees Coveredby Collective Bargaining Agreements Expiring Within One Year PercentageofEmployeesCoveredbyCollectiveBargainingAgreementsExpiringWithinOneYear	0
CY2018Q3	us-gaap	Revenues Revenues	393100000	USD
CY2017Q3	us-gaap	Revenues Revenues	332800000	USD
	us-gaap	Revenues Revenues	1196500000	USD
	us-gaap	Revenues Revenues	1044400000	USD
CY2018Q3	us-gaap	Revenues Revenues	393100000	USD
	us-gaap	Revenues Revenues	1196500000	USD
CY2018Q3	us-gaap	Income Taxes Paid IncomeTaxesPaid	400000	USD
CY2017Q3	us-gaap	Income Taxes Paid IncomeTaxesPaid	300000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	3300000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	800000	USD
CY2018Q3	kalu	Ownership Interest In Subsidiaries OwnershipInterestInSubsidiaries	1
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	94300000	USD
CY2018Q3	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	88400000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	194500000	USD
CY2018Q3	kalu	Intercompany Receivables Current IntercompanyReceivablesCurrent	0	USD
CY2018Q3	us-gaap	Other Receivables OtherReceivables	24400000	USD
CY2018Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	51000000.0	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	196200000	USD
CY2018Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	24200000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	673000000.0	USD
CY2018Q3	us-gaap	Investments In And Advances To Affiliates At Fair Value InvestmentsInAndAdvancesToAffiliatesAtFairValue	0	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	595400000	USD
CY2018Q3	kalu	Intercompany Receivables Noncurrent IntercompanyReceivablesNoncurrent	0	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	42200000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	33000000.0	USD
CY2018Q3	us-gaap	Goodwill Goodwill	43400000	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	39000000.0	USD
CY2018Q3	us-gaap	Assets Assets	1426000000.0	USD
CY2018Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	120400000	USD
CY2018Q3	kalu	Intercompany Payable Current IntercompanyPayableCurrent	0	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	35100000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	571400000	USD
CY2017Q4	kalu	Intercompany Receivables Noncurrent IntercompanyReceivablesNoncurrent	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	72000000.0	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	25000000.0	USD
CY2017Q4	us-gaap	Goodwill Goodwill	18800000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	41400000	USD
CY2017Q4	us-gaap	Assets Assets	1385200000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	90000000.0	USD
CY2017Q4	kalu	Intercompany Payable Current IntercompanyPayableCurrent	0	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	42600000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	40500000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	173100000	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	37000000.0	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	192500000	USD
CY2018Q3	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	31800000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	4300000	USD
CY2018Q3	kalu	Intercompany Payable Noncurrent IntercompanyPayableNoncurrent	0	USD
CY2018Q3	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	64700000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	370200000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	663500000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	762500000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1426000000.0	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	51100000	USD
CY2017Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	183700000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	165000000.0	USD
CY2017Q4	kalu	Intercompany Receivables Current IntercompanyReceivablesCurrent	0	USD
CY2017Q4	us-gaap	Other Receivables OtherReceivables	15500000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	207900000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	33400000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	656600000	USD
CY2017Q4	us-gaap	Investments In And Advances To Affiliates At Fair Value InvestmentsInAndAdvancesToAffiliatesAtFairValue	0	USD
CY2017Q4	kalu	Net Liability In Respect Of Veba NetLiabilityInRespectOfVeba	31900000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	4300000	USD
CY2017Q4	kalu	Intercompany Payable Noncurrent IntercompanyPayableNoncurrent	0	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	60000000.0	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	369600000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	638900000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	746300000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1385200000	USD
CY2018Q3	us-gaap	Revenues Revenues	393100000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	323300000	USD
CY2018Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11000000.0	USD
CY2018Q3	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	23900000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	358200000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	34900000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	5700000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	700000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29900000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8200000	USD
CY2018Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21700000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20900000	USD
CY2017Q3	us-gaap	Revenues Revenues	332800000	USD
CY2017Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	256400000	USD
CY2017Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	10200000	USD
CY2017Q3	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	24700000	USD
CY2017Q3	us-gaap	Costs And Expenses CostsAndExpenses	291300000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	41500000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	5300000	USD
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-200000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	36000000.0	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16100000	USD
CY2017Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	19900000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21500000	USD
	us-gaap	Revenues Revenues	1196500000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	983400000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	32400000	USD
	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	73900000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	100000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	1089800000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	106700000	USD
	us-gaap	Interest Expense InterestExpense	17000000.0	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	300000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	90000000.0	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21900000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	68100000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65400000	USD
	us-gaap	Revenues Revenues	1044400000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	808700000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	29300000	USD
	kalu	Selling Administrative Research And Development And General Expenses SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses	74700000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	18400000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	931100000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	113300000	USD
	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	200000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4500000	USD
	us-gaap	Interest Expense InterestExpense	16400000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	500000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36800000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	60600000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64600000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	112500000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	53100000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	111900000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	900000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	208700000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	43300000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	600000	USD
	kalu	Changein Intercompany Loans Receivable ChangeinIntercompanyLoansReceivable	0	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	100000	USD
	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	500000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6900000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	31900000	USD
	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	0	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	28500000	USD
	kalu	Changein Intercompany Loans Payable ChangeinIntercompanyLoansPayable	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67800000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	44800000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	64300000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109100000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	131500000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	56100000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	196000000.0	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	237200000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	600000	USD
	kalu	Changein Intercompany Loans Receivable ChangeinIntercompanyLoansReceivable	0	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-14300000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	66700000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	26400000	USD
	kalu	Changein Intercompany Loans Payable ChangeinIntercompanyLoansPayable	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-97800000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	19400000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67700000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	87100000	USD

Files In Submission

Name	View Source	Status
0000811596-18-000053-index-headers.html	Edgar Link	pending
0000811596-18-000053-index.html	Edgar Link	pending
0000811596-18-000053.txt	Edgar Link	pending
0000811596-18-000053-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
kalu-20180930.xsd	Edgar Link	pending
kalu-20180930_cal.xml	Edgar Link	unprocessable
kalu-20180930_def.xml	Edgar Link	unprocessable
kalu-20180930_lab.xml	Edgar Link	unprocessable
kalu-20180930_pre.xml	Edgar Link	unprocessable
kalu930201810-q.htm	Edgar Link	pending
kalu930201810-q_htm.xml	Edgar Link	completed
kaluexhibit311-9302018.htm	Edgar Link	pending
kaluexhibit312-9302018.htm	Edgar Link	pending
kaluexhibit321-9302018.htm	Edgar Link	pending
kaluexhibit322-9302018.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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$KALU
KAISER ALUMINUM CORP Stock $kalu

2018 Q4 Form 10-Q Financial Statement

#000081159618000053 Filed on October 25, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KALU KAISER ALUMINUM CORP Stock $kalu

2018 Q4 Form 10-Q Financial Statement

#000081159618000053 Filed on October 25, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KALU
KAISER ALUMINUM CORP Stock $kalu