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Segment Information Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
OSB Mills Construction Related Legal Reserves
Dec. 31, 2012
Fair Value, Inputs, Level 2
Dec. 31, 2012
Fair Value, Inputs, Level 2
Dec. 31, 2011
Fair Value, Inputs, Level 2
Dec. 31, 2012
Supplemental employee retirement plans, defined benefit
Dec. 31, 2012
Supplemental employee retirement plans, defined benefit
Sep. 30, 2012
Siding
Dec. 31, 2012
Siding
Segment Reporting Information [Line Items]                            
Loss Contingency, Loss in Period               $ 5.0            
Severance Costs             0.3              
Loss Contingency Accrual, Carrying Value, Provision             0.5              
Product Warranty Accrual, Period Increase (Decrease)       17.7 (1.8) (0.4)             1.0 1.0
Impairment of Long-Lived Assets to be Disposed of                 4.4 6.9        
Gain on settlement of litigation related to ARS     (20.0) 0 20.0 0                
Adjustments related to prior year inventory 4.8 1.6 1.5 4.8 0 0                
Adjustments to retirement accounts       0 3.8 0                
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments       0 (2.2) 0         (2.2) (2.2)    
Termination indemnities in South America         1.6                  
Reductions, net of additions, to product related contingency reserves       0 (5.0) (11.5)                
Reserves For Timber Obligations       0 0.8 1.5                
Addition to environmental related contingency reserves       (1.0) 0 (0.9)                
Other-than-temporary impairment of investments       $ 0 $ 0 $ 14.8