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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]        
Deferred taxes and other included a deferred tax benefit $ 2.3 $ 1.5 $ 17.6  
Other taxes total expense 0.1 1.8 0.8  
Federal income tax rate 35.00% 35.00% 35.00%  
Valuation allowance 30.5      
Research and development, tax credit 0.4 1.0 2.6  
Unremitted earnings, reinvested 236.3 197.4    
Cellulosic biofuel credit per gallon of black liquor produced 1.01      
Claimed income tax       23.2
Convertible portion of the previously utilized refundable alternative fuel mixture credit 0.50      
Income tax benefit from conversion to cellulosic biofuel 4.0      
Return to Internal Revenue Service 14.1      
Gross unrecognized tax benefits 30.4 29.7 38.7 40.1
Unrecognized tax benefits that would impact effective tax rate 30.4      
Reserve for an uncertain tax position 2.2      
Lower range of gross unrecognized tax benefits balance may decrease within the next twelve months 0      
Higher range of gross unrecognized tax benefits balance may decrease within the next twelve months 17.9      
Net reduction of interest benefit 0.3 2.1    
Liability for interest 1.4 1.7 3.8  
Penalties associated with uncertain tax positions 0 0 0  
State And Local Jurisdiction [Member]
        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 68.7      
Tax credit carryforwards 0.4      
Foreign Tax Authority [Member]
        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 247.9      
Tax credit carryforwards 3.8      
Domestic Country [Member]
        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforwards $ 0.3