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Summary of Significant Accounting Policies, Textuals, Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment |  |  |
Interest expense capitalized as construction in progress | $ 2.5 us-gaap_InterestCostsIncurredCapitalized | $ 3.4 us-gaap_InterestCostsIncurredCapitalized | $ 1.7 us-gaap_InterestCostsIncurredCapitalized
Depreciation expense | 29.5 us-gaap_Depreciation | 26.4 us-gaap_Depreciation | 24.7 us-gaap_Depreciation
Asset impairment charge | 1.5 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 4.4 us-gaap_AssetImpairmentCharges
Fabricated Products |  |  |
Property, Plant and Equipment |  |  |
Depreciation expense | 29.0 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 25.8 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 24.2 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember
Asset impairment charge | 1.5 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 4.4 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember
Fabricated Products | Idled equipment |  |  |
Property, Plant and Equipment |  |  |
Asset impairment charge |  | $ 0 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kalu_IdledAssetMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Minimum | Land improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 3 years |  |
Minimum | Buildings and leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 15 years |  |
Minimum | Machinery and equipment |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 1 year |  |
Minimum | Capital lease assets |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 3 years |  |
Maximum | Land improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 25 years |  |
Maximum | Buildings and leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 45 years |  |
Maximum | Machinery and equipment |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 24 years |  |
Maximum | Capital lease assets |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 5 years |  |

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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X
- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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