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Restatement of Previously Issued Financial Statements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset in respect of VEBA(s) | $ 144.7 |  |  |  | $ 158.0 |  |  |  | $ 144.7 |  | $ 158.0 |  |
Deferred tax assets - net | 226.9 |  |  |  | 245.3 |  |  |  | 226.9 |  | 245.3 |  |
Total assets | 1,320.6 |  |  |  | 1,318.9 |  |  |  | 1,320.6 |  | 1,318.9 |  |
Retained earnings | 84.4 |  |  |  | 78.0 |  |  |  | 84.4 |  | 78.0 |  |
Accumulated other comprehensive income (loss) | (85.0) |  |  |  | (19.7) |  |  |  | (85.0) |  | (19.7) |  |
Total stockholders' equity | 872.8 |  |  |  | 888.7 |  |  |  | 872.8 |  | 888.7 | 870.3 | 788.1
Total liabilities and equity | 1,320.6 |  |  |  | 1,318.9 |  |  |  | 1,320.6 |  | 1,318.9 |  |
Statements of Consolidated Income: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, administrative, research and development, and general |  |  |  |  |  |  |  |  | 62.7 |  | 67.7 | 69.9 |
Total costs and expenses |  |  |  |  |  |  |  |  | 1,246.3 |  | 1,038.0 | 868.3 |
Operating income | 15.6 | 4.9 | 14.7 | 19.8 | 11.6 | 12.3 | 3.2 | 14.0 | 55.0 |  | 41.1 | 118.7 |
Income before income taxes |  |  |  |  |  |  |  |  | 41.3 |  | 25.1 | 118.6 |
Income tax provision |  |  |  |  |  |  |  |  | (16.2) |  | (13.1) | (48.1) |
Net income | 6.1 | 4.1 | 4.1 | 10.8 | (0.9) | 5.0 | (0.4) | 8.3 | 25.1 | [1] | 12.0 | 70.5 |
Earnings per common share, Basic: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share | $ 0.33 | $ 0.21 | $ 0.22 | $ 0.57 | $ (0.05) | $ 0.26 | $ (0.02) | $ 0.41 | $ 1.32 | [1] | $ 0.61 | $ 3.51 |
Earnings per common share, Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share | $ 0.33 | $ 0.21 | $ 0.22 | $ 0.57 | $ (0.05) | $ 0.26 | $ (0.02) | $ 0.41 | $ 1.32 | [1] | $ 0.61 | $ 3.51 |
Statements of Consolidated Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 6.1 | 4.1 | 4.1 | 10.8 | (0.9) | 5.0 | (0.4) | 8.3 | 25.1 | [1] | 12.0 | 70.5 |
Defined benefit pension plan and VEBAs |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) arising during the period |  |  |  |  |  |  |  |  | (110.6) |  | 25.5 | 66.3 |
Tax impact on net actuarial gain (loss) |  |  |  |  |  |  |  |  | 42.2 |  | (9.7) | (25.0) |
Prior service cost arising during the period |  |  |  |  |  |  |  |  | 0 |  | 0 | (33.8) |
Tax impact on prior service cost |  |  |  |  |  |  |  |  |  |  |  | 12.7 |
Reclassification adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |
Less: amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  | 0.6 |  | 0.7 | 3.8 |
Less: tax impact on amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  | (0.2) |  | (0.2) | (1.4) |
Less: amortization of prior service cost |  |  |  |  |  |  |  |  | 4.2 |  | 4.2 | 1.6 |
Less: tax impact on amortization of prior service cost |  |  |  |  |  |  |  |  | (1.6) |  | (1.6) | (0.6) |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (40.2) |  | 30.5 | 92.6 |
Statements of Consolidated Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 6.1 | 4.1 | 4.1 | 10.8 | (0.9) | 5.0 | (0.4) | 8.3 | 25.1 | [1] | 12.0 | 70.5 |
Retained earnings | 84.4 |  |  |  | 78.0 |  |  |  | 84.4 |  | 78.0 |  |
Accumulated other comprehensive income (loss) | (85.0) |  |  |  | (19.7) |  |  |  | (85.0) |  | (19.7) |  |
Total stockholders' equity | 872.8 |  |  |  | 888.7 |  |  |  | 872.8 |  | 888.7 | 870.3 | 788.1
Statements of Consolidated Cash Flows |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 6.1 | 4.1 | 4.1 | 10.8 | (0.9) | 5.0 | (0.4) | 8.3 | 25.1 | [1] | 12.0 | 70.5 |
Deferred income taxes |  |  |  |  |  |  |  |  | 17.6 |  | 13.3 | 47.3 |
Non-cash net periodic benefit (income) costs |  |  |  |  |  |  |  |  | (5.7) |  | 5.1 | 5.3 |
Other non-cash changes in assets and liabilities |  |  |  |  |  |  |  |  | 0.4 |  | (0.7) | 0.2 |
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset in respect of VEBA(s) |  |  |  |  | 195.7 |  |  |  |  |  | 195.7 |  |
Deferred tax assets - net |  |  |  |  | 231.1 |  |  |  |  |  | 231.1 |  |
Total assets |  |  |  |  | 1,342.4 |  |  |  |  |  | 1,342.4 |  |
Retained earnings |  |  |  |  | 80.1 |  |  |  |  |  | 80.1 |  |
Accumulated other comprehensive income (loss) |  |  |  |  | 1.7 |  |  |  |  |  | 1.7 | (7.3) |
Total stockholders' equity |  |  |  |  | 912.2 |  |  |  |  |  | 912.2 | 901.2 |
Total liabilities and equity |  |  |  |  | 1,342.4 |  |  |  |  |  | 1,342.4 |  |
Statements of Consolidated Income: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, administrative, research and development, and general |  |  |  |  |  |  |  |  |  |  | 64.4 |  |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 1,034.7 |  |
Operating income |  |  |  |  |  |  |  |  |  |  | 44.4 |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 28.4 |  |
Income tax provision |  |  |  |  |  |  |  |  |  |  | (14.3) |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14.1 |  |
Earnings per common share, Basic: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share |  |  |  |  |  |  |  |  |  |  | $ 0.72 |  |
Earnings per common share, Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share |  |  |  |  |  |  |  |  |  |  | $ 0.72 |  |
Statements of Consolidated Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14.1 |  |
Defined benefit pension plan and VEBAs |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) arising during the period |  |  |  |  |  |  |  |  |  |  | 11.4 | 114.6 |
Tax impact on net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | (4.4) | (43.2) |
Prior service cost arising during the period |  |  |  |  |  |  |  |  |  |  |  | (32.4) |
Tax impact on prior service cost |  |  |  |  |  |  |  |  |  |  |  | 12.2 |
Reclassification adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |
Less: amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | (0.4) |  |
Less: tax impact on amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | 0.2 |  |
Less: amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | 4.2 |  |
Less: tax impact on amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | (1.6) |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | 23.1 | 123.5 |
Statements of Consolidated Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14.1 |  |
Retained earnings |  |  |  |  | 80.1 |  |  |  |  |  | 80.1 |  |
Accumulated other comprehensive income (loss) |  |  |  |  | 1.7 |  |  |  |  |  | 1.7 | (7.3) |
Total stockholders' equity |  |  |  |  | 912.2 |  |  |  |  |  | 912.2 | 901.2 |
Statements of Consolidated Cash Flows |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14.1 |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  | 14.5 |  |
Non-cash net periodic benefit (income) costs |  |  |  |  |  |  |  |  |  |  | 0 |  |
Other non-cash changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  | 1.0 |  |
Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset in respect of VEBA(s) |  |  |  |  | (37.7) |  |  |  |  |  | (37.7) |  |
Deferred tax assets - net |  |  |  |  | 14.2 |  |  |  |  |  | 14.2 |  |
Total assets |  |  |  |  | (23.5) |  |  |  |  |  | (23.5) |  |
Retained earnings |  |  |  |  | (2.1) |  |  |  |  |  | (2.1) |  |
Accumulated other comprehensive income (loss) |  |  |  |  | (21.4) |  |  |  |  |  | (21.4) | (30.9) |
Total stockholders' equity |  |  |  |  | (23.5) |  |  |  |  |  | (23.5) | (30.9) |
Total liabilities and equity |  |  |  |  | (23.5) |  |  |  |  |  | (23.5) |  |
Statements of Consolidated Income: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, administrative, research and development, and general |  |  |  |  |  |  |  |  |  |  | 3.3 |  |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 3.3 |  |
Operating income |  | (0.7) | (0.7) | (0.7) | (0.8) | (0.8) | (0.8) | (0.8) |  |  | (3.3) |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | (3.3) |  |
Income tax provision |  |  |  |  |  |  |  |  |  |  | 1.2 |  |
Net income |  | (0.4) | (0.4) | (0.4) | (0.5) | (0.5) | (0.5) | (0.5) |  |  | (2.1) |  |
Earnings per common share, Basic: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share |  | $ (0.02) | $ (0.02) | $ (0.02) | $ (0.03) | $ (0.03) | $ (0.03) | $ (0.03) |  |  | $ (0.11) |  |
Earnings per common share, Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share |  | $ (0.02) | $ (0.02) | $ (0.02) | $ (0.03) | $ (0.03) | $ (0.03) | $ (0.03) |  |  | $ (0.11) |  |
Statements of Consolidated Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | (0.4) | (0.4) | (0.4) | (0.5) | (0.5) | (0.5) | (0.5) |  |  | (2.1) |  |
Defined benefit pension plan and VEBAs |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) arising during the period |  |  |  |  |  |  |  |  |  |  | 14.1 | (48.3) |
Tax impact on net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | (5.3) | 18.2 |
Prior service cost arising during the period |  |  |  |  |  |  |  |  |  |  |  | (1.4) |
Tax impact on prior service cost |  |  |  |  |  |  |  |  |  |  |  | 0.5 |
Reclassification adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |
Less: amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | 1.1 |  |
Less: tax impact on amortization of net actuarial gain (loss) |  |  |  |  |  |  |  |  |  |  | (0.4) |  |
Less: amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | 0 |  |
Less: tax impact on amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | 0 |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | 7.4 | (30.9) |
Statements of Consolidated Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | (0.4) | (0.4) | (0.4) | (0.5) | (0.5) | (0.5) | (0.5) |  |  | (2.1) |  |
Retained earnings |  |  |  |  | (2.1) |  |  |  |  |  | (2.1) |  |
Accumulated other comprehensive income (loss) |  |  |  |  | (21.4) |  |  |  |  |  | (21.4) | (30.9) |
Total stockholders' equity |  |  |  |  | (23.5) |  |  |  |  |  | (23.5) | (30.9) |
Statements of Consolidated Cash Flows |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | (0.4) | (0.4) | (0.4) | (0.5) | (0.5) | (0.5) | (0.5) |  |  | (2.1) |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  | (1.2) |  |
Non-cash net periodic benefit (income) costs |  |  |  |  |  |  |  |  |  |  | 5.1 |  |
Other non-cash changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  | (1.7) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  | (38.2) |
Total stockholders' equity | (85.0) |  |  |  |  |  |  |  | (85.0) |  |  |  | (60.3)
Statements of Consolidated Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  | (38.2) |
Total stockholders' equity | $ (85.0) |  |  |  |  |  |  |  | $ (85.0) |  |  |  | $ (60.3)
[1] | The combined results presented for year ended December 31, 2011 are the actual results presented in the Statements of Consolidated Income, as the operating results for the Chandler, Arizona (Extrusion) facility were included in the Company's consolidated operating results commencing January 1, 2011 (see Note 1).

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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