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Segment and Geographical Area Information, Revenues from External Customers by Products (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charges |  |  |  |  |  |  |  |  | $ 1.5 us-gaap_AssetImpairmentCharges | $ 0 us-gaap_AssetImpairmentCharges | $ 4.4 us-gaap_AssetImpairmentCharges
Net sales | 338.0 us-gaap_SalesRevenueGoodsNet | 338.9 us-gaap_SalesRevenueGoodsNet | 344.1 us-gaap_SalesRevenueGoodsNet | 335.1 us-gaap_SalesRevenueGoodsNet | 311.3 us-gaap_SalesRevenueGoodsNet | 319.9 us-gaap_SalesRevenueGoodsNet | 328.9 us-gaap_SalesRevenueGoodsNet | 337.4 us-gaap_SalesRevenueGoodsNet | 1,356.1 us-gaap_SalesRevenueGoodsNet | 1,297.5 us-gaap_SalesRevenueGoodsNet | 1,360.1 us-gaap_SalesRevenueGoodsNet
Aero/HS products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 686.3 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AeroHsProductsMember | 677.0 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AeroHsProductsMember | 695.1 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AeroHsProductsMember
Automotive Extrusions |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 173.5 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AutomotiveExtrusionsMember | 129.5 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AutomotiveExtrusionsMember | 125.5 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_AutomotiveExtrusionsMember
GE products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 419.5 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_GeProductsMember | 411.0 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_GeProductsMember | 441.4 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_GeProductsMember
Other products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 76.8 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_OtherProductsMember | $ 80.0 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_OtherProductsMember | $ 98.1 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = kalu_OtherProductsMember

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