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Statement of Consolidated Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Common Stock Owned by Union VEBA | Treasury Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 |  | $ 872.8 us-gaap_StockholdersEquity | $ 0.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 998.4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 84.4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (52.9)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = kalu_CommonStockOwnedByUnionVebaSubjectToTransferRestrictionMember | $ (72.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (85.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance, shares at Dec. 31, 2011 |  |  | 19,253,185 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 85.8 us-gaap_NetIncomeLoss |  |  | 85.8 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other comprehensive income, net of tax |  | 59.0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  | 59.0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Release of restriction on Union VEBA shares, net of tax of $19.6, $25.0, and $41.3 for 2010, 2011, and 2012, respectively) |  | 67.3 kalu_IncreaseDecreaseInEquityRelatingToSaleOfCommonSharesOwnedByUnionVeba |  | 14.4 kalu_IncreaseDecreaseInEquityRelatingToSaleOfCommonSharesOwnedByUnionVeba / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 52.9 kalu_IncreaseDecreaseInEquityRelatingToSaleOfCommonSharesOwnedByUnionVeba / us-gaap_StatementEquityComponentsAxis = kalu_CommonStockOwnedByUnionVebaSubjectToTransferRestrictionMember |  |
Issuance of non-vested shares to employees |  |  | 92,949 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to directors, shares |  |  | 3,930 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to non-employee directors |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of common shares to employees upon vesting of restricted stock units and performance shares |  |  | 11,327 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of employee non-vested shares |  |  | (2,355)us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares |  |  | (45,801)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares |  | (2.2)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  | (2.2)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Repurchase of common stock, shares |  | 0 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |  |
Shares returned from distribution of third party trust, value |  | 0 kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue |  |  |  |  |  |
Cash dividends on common stock ($0.96, $1.00 and $1.20 per share for 2011, 2012 and 2013, respectively) |  | (19.6)us-gaap_DividendsCommonStockCash |  |  | (19.6)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  | 1.3 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 1.3 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Amortization of unearned equity compensation |  | 5.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 5.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Dividends on unvested equity awards that were canceled |  | 0.6 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards |  |  | 0.6 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Ending balance at Dec. 31, 2012 |  | 1,070.8 us-gaap_StockholdersEquity | 0.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,017.7 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 151.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = kalu_CommonStockOwnedByUnionVebaSubjectToTransferRestrictionMember | (72.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (26.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2012 |  |  | 19,313,235 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 104.8 us-gaap_NetIncomeLoss |  |  | 104.8 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Other comprehensive income, net of tax |  | 5.3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  | 5.3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Issuance of non-vested shares to employees |  |  | 76,336 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to directors, shares |  |  | 2,916 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to non-employee directors |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of common shares to employees upon vesting of restricted stock units and performance shares |  |  | 36,503 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of employee non-vested shares |  |  | (820)us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares |  |  | (40,075)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares |  | (2.5)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  | (2.5)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Repurchase of common stock, shares |  | (1,232,077)us-gaap_TreasuryStockSharesAcquired | (1,232,077)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Repurchase of common stock |  | (79.3)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (79.3)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Shares returned from distribution of bankruptcy trust, shares |  | (9,001)kalu_Sharesreturnedfromdistributionofbankruptcytrustshares |  |  |  |  |  |
Dividends received from distribution of bankruptcy trust |  | 0.6 kalu_Dividendsreceivedfromdistributionofbankruptcytrust |  |  |  |  |  |
Shares returned from distribution of third party trust, value | [1] | (0.6)kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue |  |  |  |  |  |
Cash dividends on common stock ($0.96, $1.00 and $1.20 per share for 2011, 2012 and 2013, respectively) |  | (23.0)us-gaap_DividendsCommonStockCash |  |  | (23.0)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  | 1.1 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 1.1 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Amortization of unearned equity compensation |  | 6.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 6.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Dividends on unvested equity awards that were canceled |  | 0.2 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards |  |  | 0.2 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Ending balance at Dec. 31, 2013 |  | 1,084.2 us-gaap_StockholdersEquity | 0.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,023.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 233.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = kalu_CommonStockOwnedByUnionVebaSubjectToTransferRestrictionMember | (152.2)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (20.7)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2013 |  | 18,147,017 us-gaap_CommonStockSharesOutstanding | 18,147,017 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 71.8 us-gaap_NetIncomeLoss |  |  |  |  |  |
Other comprehensive income, net of tax |  | (75.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  | (75.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Issuance of non-vested shares to employees |  |  | 119,799 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to directors, shares |  |  | 2,969 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of common shares to non-employee directors |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices |  | 0.2 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of common shares to employees upon vesting of restricted stock units and performance shares |  |  | 44,895 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of employee non-vested shares |  |  | (40,503)us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares |  |  | (33,696)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares |  | (2.4)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  | (2.4)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Repurchase of common stock, shares |  | (633,230)us-gaap_TreasuryStockSharesAcquired | (633,230)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Repurchase of common stock |  | (44.9)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (44.9)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Shares returned from distribution of third party trust, value |  | 0 kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue |  |  |  |  |  |
Cash dividends on common stock ($0.96, $1.00 and $1.20 per share for 2011, 2012 and 2013, respectively) |  | (25.4)us-gaap_DividendsCommonStockCash |  |  | (25.4)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  | 0.8 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 0.8 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Amortization of unearned equity compensation |  | 6.8 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 6.8 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Dividends on unvested equity awards that were canceled |  | 0.2 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards |  |  | 0.2 kalu_ReclassificationRelatingToDividendsOnUnvestedEquityAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Ending balance at Dec. 31, 2014 |  | $ 1,015.9 us-gaap_StockholdersEquity | $ 0.2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,028.5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 280.4 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = kalu_CommonStockOwnedByUnionVebaSubjectToTransferRestrictionMember | $ (197.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (96.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2014 |  | 17,607,251 us-gaap_CommonStockSharesOutstanding | 17,607,251 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
[1] | See Note 12 for discussion of the distribution.

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- Definition Increase (decrease) in equity relating to sale of common shares owned by Union VEBA + References No definition available. + Details
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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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