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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Data [Abstract] |
Quarterly Financial Information [Text Block] | KAISER ALUMINUM CORPORATION AND SUBSIDIARY COMPANIES QUARTERLY FINANCIAL DATA (Unaudited) (in millions of dollars, except share and per share amounts and as otherwise indicated) The following tables present the unaudited financial data for each of the interim periods in 2011 and 2010. Subsequent to the issuance of the unaudited consolidated financial statements for the quarter ended September 30, 2011, the Company identified errors in the accuracy and completeness of the data previously provided by the Union VEBA. The Company determined that it had omitted certain deferred retirees from the Union VEBA's participant population and misinterpreted the benefit election of certain participants for the years ended December 31, 2009 and December 31, 2010. As a result of these errors, the previously presented unaudited consolidated quarterly financial statements for the interim periods in 2011 each contained a $0.7 overstatement of Operating income, a $0.4 overstatement of Net income and a $0.02 overstatement of Net income per share - basic and diluted, and the unaudited consolidated quarterly financial statements for the interim periods in 2010 each contained a $0.8 overstatement of Operating income, a $0.5 overstatement of Net income and a $0.03 overstatement of Net income per share - basic and diluted. The tables below reflect the unaudited restated amounts for each of the interim periods in 2011 and 2010 except for the quarter ended December 31, 2011. Management believes the effects of these errors are not material to any of its previously issued consolidated financial statements. The restated financial information for each of the 2011 interim periods will also be reflected in the Company's Quarterly Report on Form 10-Q for corresponding interim periods ending in 2012, when such report is filed with the SEC.
|  | Quarter Ended 31-Mar |  | Quarter Ended 30-Jun |  | Quarter Ended 30-Sep |  | Quarter Ended 31-Dec
2011 |  |  |  |  |  |  |  |
Net sales |  | $ | 322.6 |  |  | $ | 338.8 |  |  | $ | 322.3 |  |  | $ | 317.6 |
Cost of products sold, excluding depreciation, amortization and other items |  | 280.9 |  |  | 300.0 |  |  | 297.7 |  |  | 280.3 |
Restructuring costs and other (benefits) charges |  | — |  |  | — |  |  | (0.3 | ) |  | — |
Gross Profit |  | 41.7 |  |  | 38.8 |  |  | 24.9 |  |  | 37.3 |
Operating income |  | 19.8 |  |  | 14.7 |  |  | 4.9 |  |  | 15.6 |
Net income |  | $ | 10.8 |  |  | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | 6.1 |
Earnings per common share, Basic: |  |  |  |  |  |  |  |
Net income per share |  | $ | 0.57 |  |  | $ | 0.22 |  |  | $ | 0.21 |  |  | $ | 0.33 |
Earnings per common share, Diluted: |  |  |  |  |  |  |  |
Net income per share |  | $ | 0.57 |  |  | $ | 0.22 |  |  | $ | 0.21 |  |  | $ | 0.33 |
Common stock market price: |  |  |  |  |  |  |  |
High |  | $ | 52.77 |  |  | $ | 54.62 |  |  | $ | 56.30 |  |  | $ | 49.46 |
Low |  | $ | 45.88 |  |  | $ | 46.37 |  |  | $ | 43.71 |  |  | $ | 40.26 |
|  | Quarter Ended 31-Mar |  | Quarter Ended 30-Jun |  | Quarter Ended 30-Sep |  | Quarter Ended 31-Dec
2010 |  |  |  |  |  |  |  |
Net sales |  | $ | 267.5 |  |  | $ | 282.4 |  |  | $ | 263.4 |  |  | $ | 265.8 |
Cost of products sold, excluding depreciation, amortization and other items |  | 232.0 |  |  | 255.9 |  |  | 229.3 |  |  | 229.6 |
Restructuring costs and other (benefits) charges |  | (0.6 | ) |  | 0.1 |  |  | (0.4 | ) |  | 0.6 |
Gross Profit |  | 36.1 |  |  | 26.4 |  |  | 34.5 |  |  | 35.6 |
Operating income |  | 14.0 |  |  | 3.2 |  |  | 12.3 |  |  | 11.6 |
Net income (loss) |  | $ | 8.3 |  |  | $ | (0.4 | ) |  | $ | 5.0 |  |  | $ | (0.9 | )
Earnings per common share, Basic: |  |  |  |  |  |  |  |
Net income (loss) per share |  | $ | 0.41 |  |  | $ | (0.02 | ) |  | $ | 0.26 |  |  | $ | (0.05 | )
Earnings per common share, Diluted: |  |  |  |  |  |  |  |
Net income (loss) per share |  | $ | 0.41 |  |  | $ | (0.02 | ) |  | $ | 0.26 |  |  | $ | (0.05 | )
Common stock market price: |  |  |  |  |  |  |  |
High |  | $ | 44.40 |  |  | $ | 41.63 |  |  | $ | 43.23 |  |  | $ | 52.00 |
Low |  | $ | 32.83 |  |  | $ | 32.91 |  |  | $ | 33.90 |  |  | $ | 42.07 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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