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Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Assets held for sale reclassified to held and used $ 14.9    
Assets Held-for-sale, Property, Plant and Equipment   112.2 114.6
Accumulated depreciation   95.9 97.0
Net property, plant and equipment   16.3 17.6
Land, land improvements and logging roads, net of road amortization [Member]
      
Property, Plant and Equipment [Line Items]      
Assets Held-for-sale, Property, Plant and Equipment   6.9 7.1
Building [Member]
      
Property, Plant and Equipment [Line Items]      
Assets Held-for-sale, Property, Plant and Equipment   6.2 7.8
Machinery and equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Assets Held-for-sale, Property, Plant and Equipment   $ 99.1 $ 99.7