XML 64 R65.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Commitments and Contingencies, Environmental Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |
Environmental accrual | $ 19.3 us-gaap_AccrualForEnvironmentalLossContingencies | $ 22.8 us-gaap_AccrualForEnvironmentalLossContingencies | $ 21.7 us-gaap_AccrualForEnvironmentalLossContingencies
Expected period related to remediation expenditures for environmental contingencies | 30 years |  |
Estimated environmental contingency loss exposure in excess of current accrual | 25.1 us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued |  |
Time period within which Company's recorded estimate of its obligation may change | 12 months |  |
Accrual for Environmental Loss Contingencies |  |  |
Beginning balance | 22.8 us-gaap_AccrualForEnvironmentalLossContingencies | 21.7 us-gaap_AccrualForEnvironmentalLossContingencies | 22.0 us-gaap_AccrualForEnvironmentalLossContingencies
Additional accruals | 0.8 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease | 4.5 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease | 1.2 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease
Less expenditures | (4.3)us-gaap_AccrualForEnvironmentalLossContingenciesPayments | (3.4)us-gaap_AccrualForEnvironmentalLossContingenciesPayments | (1.5)us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Ending balance | $ 19.3 us-gaap_AccrualForEnvironmentalLossContingencies | $ 22.8 us-gaap_AccrualForEnvironmentalLossContingencies | $ 21.7 us-gaap_AccrualForEnvironmentalLossContingencies
Minimum |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |
Period for feasibility study completion | 18 months |  |
Maximum |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |
Period for feasibility study completion | 24 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 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: 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 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
- Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGrossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate amount disbursed during the reporting period to settle environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease) in the accrual for environmental loss contingencies during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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