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Segment Information Interim Financial Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product Warranty Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  | $ 1.8 | $ 0.4 | $ 0
Net sales | 458.7 | 467.8 | 427.8 | 361.5 | 312.2 | 350.6 | 362.4 | 331.7 | 1,715.8 | 1,356.9 | 1,383.6
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 56.8 | 37.3 | (45.5) | (10.6) | (49.6) | (74.2) | (33.9) | (26.4) | 38.0 | (184.1) | (47.9)
Income (loss) from continuing operations, including portion attributable to noncontrolling interest | 49.1 | 31.4 | (37.2) | (11.2) | (56.8) | (59.3) | (32.9) | (22.9) | 32.1 | (171.9) | (32.2)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 46.1 | 31.3 | (37.3) | (11.3) | (57.2) | (65.6) | (35.4) | (22.9) | 28.8 | (181.1) | (38.6)
Income (loss) from continuing operations | $ 0.35 | $ 0.23 | $ (0.27) | $ (0.08) | $ (0.42) | $ (0.44) | $ (0.25) | $ (0.18) | $ 0.23 | $ (1.29) | $ (0.25)
Income (loss) per share from continuing operations | $ 0.34 | $ 0.22 | $ (0.27) | $ (0.08) | $ (0.42) | $ (0.44) | $ (0.25) | $ (0.18) | $ 0.22 | $ (1.29) | $ (0.25)
Net income (loss) per share - basic | $ 0.33 | $ 0.23 | $ (0.27) | $ (0.08) | $ (0.42) | $ (0.49) | $ (0.27) | $ (0.18) | $ 0.21 | $ (1.36) | $ (0.30)
Net income (loss) per share - diluted | $ 0.32 | $ 0.22 | $ (0.27) | $ (0.08) | $ (0.42) | $ (0.49) | $ (0.27) | $ (0.18) | $ 0.20 | $ (1.36) | $ (0.30)
Operating income (loss) |  |  |  |  |  |  |  |  | 107.4 | (140.1) | (7.6)
Other Operating Income (Expense), Net | 4.1 | (1.2) | (0.2) | 0.2 | 0 | 9.8 | 0.6 | 0.8 | 2.9 | 11.2 | (0.1)
(Gain) loss on sale or impairment of long-lived assets | (0.4) | (4.3) | (0.1) | (0.1) | (0.9) | (65.0) | (2.5) | (5.5) | (4.9) | (73.9) | (2.4)
General corporate and other expenses, net | (22.4) | (18.1) | (18.2) | (20.1) | (16.9) | (15.2) | (16.5) | (17.8) | (78.7) | (66.4) | (73.4)
Nonoperating Income (Expense) | 19.6 | 0.4 | (54.8) | (0.1) | 0.6 | (4.0) | 0.6 | 1.8 | (69.4) | (44.0) | (40.3)
Foreign currency gains (losses) |  |  |  |  |  |  |  |  | (2.7) | (1.0) | 2.2
Other-than-temporary investment impairment | 0 | 0 | 0 | 0 | (14.8) | 0 | 0 | 0 | 0 | (14.8) | (17.0)
Investment income | 3.1 | 4.1 | 3.4 | 4.2 | 4.5 | 16.7 | 3.5 | 4.0 | 14.8 | 28.7 | 38.4
Interest Expense | (12.9) | (10.7) | (13.1) | (12.6) | (14.3) | (14.2) | (14.4) | (14.0) | (49.3) | (56.9) | (63.9)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest | 61.1 | 39.3 | (48.3) | (12.4) | (59.8) | (80.2) | (41.3) | (29.7) | 39.7 | (211.0) | (54.3)
Income Tax Expense (Benefit) | 12.0 | 7.9 | (11.1) | (1.2) | (3.0) | (20.9) | (8.4) | (6.8) | 7.6 | (39.1) | (22.1)
OSB [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 243.1 | 226.6 | 194.9 | 149.0 | 130.6 | 138.8 | 140.6 | 132.1 | 814.1 | 542.0 | 602.7
Operating income (loss) | 58.0 | 49.3 | 17.0 | (0.3) | (15.5) | (16.0) | (22.9) | (9.1) | 124.0 | (63.5) | 25.8
Siding [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 116.7 | 134.1 | 137.0 | 113.1 | 93.0 | 112.0 | 118.6 | 106.2 | 500.9 | 429.8 | 427.8
Operating income (loss) | 11.0 | 20.3 | 19.4 | 16.8 | 6.2 | 11.8 | 11.3 | 12.7 | 67.4 | 42.0 | 51.3
Engineered Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 51.6 | 61.5 | 51.7 | 48.6 | 46.4 | 54.9 | 53.6 | 48.3 | 213.4 | 203.3 | 192.0
Operating income (loss) | (4.6) | (3.0) | (3.4) | (2.8) | (3.6) | (3.2) | (3.2) | (5.5) | (13.9) | (15.5) | (21.3)
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 41.7 | 42.0 | 42.7 | 42.4 | 33.8 | 36.3 | 39.5 | 35.3 | 168.8 | 144.9 | 124.7
Operating income (loss) | 6.8 | 4.5 | 3.6 | 3.1 | 1.5 | 2.3 | 4.2 | 3.6 | 18.0 | 11.6 | 7.2
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 7.5 | 9.1 | 10.7 | 10.0 | 9.1 | 9.5 | 10.4 | 10.5 | 37.4 | 39.4 | 42.9
Operating income (loss) | (1.2) | (2.0) | (1.9) | (0.7) | (6.6) | (3.2) | (2.0) | (0.7) | (5.7) | (12.5) | (1.1)
Intersegment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | (1.9) | (5.5) | (9.2) | (1.6) | (0.7) | (0.9) | (0.3) | (0.7) | (18.8) | (2.5) | (6.5)
OSB Siding [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product Warranty Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  | $ (0.8) |  |

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