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Other Operating Credits and Charges, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Gain Contingencies [Line Items]    
Reversal of severance   $ 0
Settlement of legal claim 0 0.8
Other operating credits and charges, net (0.2) (0.8)
Other Operating Income (Expense), Net 0.2 0.8
OSB Mills Construction Related Legal Reserves [Member]
   
Gain Contingencies [Line Items]    
Reversal of severance (0.3)  
Construction related legal reserves $ 0.5 $ 0