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Other Operating Credits and Charges, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gain Contingencies [Line Items]      
Reversal of severance $ (1.1)   $ 0
Litigation Settlement, Expense   (2.2)  
Addition to environmental reserves 0.9 0 (7.6)
Insurance Recoveries     2.0
Loss Contingency Accrual, Carrying Value, Period Increase (Decrease) 11.5 2.5 (3.3)
Other Expenses   0.5  
Product Warranty Accrual, Period Increase (Decrease) 0.4 (3.4) (0.8)
Timber related reserves 1.5 0 0
loss on right sizing     (1.5)
Settlement of legal claim     8.4
Other Cost and Expense, Operating (0.2) (0.4) 0.4
Other operating income (expense), net 11.2 (0.1) (1.6)
assessment   1.0  
OSB Mills Construction Related Legal Reserves [Member]
      
Gain Contingencies [Line Items]      
Reversal of severance $ 1.1