XML 92 R78.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Commitments and Contingencies, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2013
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |  |  |
Rental expense | $ 8.5 | $ 8.2 | $ 7.4 |  |  |
Environmental accrual | $ 17.2 | $ 18.6 | $ 19.3 |  |  | $ 22.8
Expected period related to remediation expenditures for environmental contingencies | 30 years |  |  |  |  |
Estimated environmental contingency loss exposure in excess of current accrual | $ 12.3 |  |  | $ 12.3 | $ 24.7 |
Time period within which Company's recorded estimate of its obligation may change | 12 months |  |  |  |  |
Minimum |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |  |  |
Period for feasibility study completion | 12 months |  |  |  |  |
Maximum |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |  |  |
Period for feasibility study completion | 18 months |  |  |  |  |

X
- Definition Expected Period Related to Remediation Expenditures for Environmental Contingencies. + References No definition available. + Details
Name: | kalu_ExpectedPeriodRelatedToRemediationExpendituresForEnvironmentalContingencies
Namespace Prefix: | kalu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period for feasibility study completion + References No definition available. + Details
Name: | kalu_Periodforfeasibilitystudycompletion
Namespace Prefix: | kalu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Time period within which Company's recorded estimate of its obligation may change. + References No definition available. + Details
Name: | kalu_TimePeriodWithinWhichCompanysRecordedEstimateOfItsObligationMayChange
Namespace Prefix: | kalu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGrossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |