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Acquisition of Peace Valley OSB (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Business Acquisition [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent 50.00%   50.00%      
Equity Interest in Joint Venture, Fair Value at Acquisition Date     $ 95.9      
Gain on acquisition of joint venture     35.9 0 0  
Acquisition Purchase Price 74.6   74.6     56.5
Contingent Consideration, Liability 2.1   2.1 0    
Adjustment to contingent consideration fair value 3.2 17.3 20.5 0 0  
Net Assets Acquired 194.8   194.8      
Business Combination, Assets Acquired, Current Assets 22.7   22.7      
Business Combination, Assets Acquired, Property, Plant, and Equipment 146.4   146.4      
Business Combination, Assets Acquired, Intangibles 43.8   43.8      
Business Combination, Assets Acquired, Timber Licenses 34.1   34.1      
Goodwill 9.7   9.7 0    
Business Combination, Liabilities Assumed, Current Liabilities 8.7   8.7      
Business Combination, Liabilities Assumed, Long-Term Liabilities 9.4   9.4      
Long-Term Liability [Member]
            
Business Acquisition [Line Items]            
Contingent Consideration, Liability $ 24.3   $ 24.3