XML 79 R65.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Employee Benefits, Net Periodic Benefit Costs and Charges Relating To Other Benefit Plans(Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |
Non-cash net periodic benefit income | [1] | $ 2.8 | $ (23.5) | $ (22.0)
Total |  | 505.2 | (14.4) | (12.9)
Fabricated Products |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | 0.1 | 0.2 | 0.3
Defined contribution plans |  | 7.8 | 7.3 | 7.2
Total |  | 8.3 | 7.8 | 8.0
All Other |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | 0.3 | 0.7 | 0.9
Defined contribution plans |  | 0.8 | 0.8 | 0.7
Total |  | 496.9 | (22.2) | (20.9)
Canadian pension plan | Fabricated Products |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |
Non-cash net periodic benefit income |  | 0.4 | 0.3 | 0.5
VEBAs | All Other |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |
Non-cash net periodic benefit income |  | $ 2.4 | $ (23.7) | $ (22.5)
[1] | See Note 6 for the impact of removing the Union VEBA (defined in Note 6) net assets.

X
- Definition Defined benefit plan net periodic benefit cost and charges relating to other benefit plans. + References No definition available. + Details
Name: | kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans
Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans [Line Items] + References No definition available. + Details
Name: | kalu_NetPeriodicBenefitCostsAndChargesRelatingToOtherBenefitPlansLineItems
Namespace Prefix: | kalu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kalu_FabricatedProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kalu_AllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_ForeignPensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=kalu_VebasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |