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Gain (loss) on sales or impairment of long lived assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Impaired Long-Lived Assets Held and Used [Line Items]                      
Asset Impairment Charges                 $ (0.1) $ (4.4) $ (74.0)
Gain (Loss) on Sale of Property Plant Equipment                 (0.1) (0.5) 0.1
Gain Loss On Sale Or Impairment Of Long Lived Assets, Net (0.6) (0.3) 0.7 0 (0.4) (4.3) (0.1) (0.1) (0.2) (4.9) (73.9)
Houlton
                      
Impaired Long-Lived Assets Held and Used [Line Items]                      
Asset Impairment Charges                     (62.0)
held and used or held for sale [Member]
                      
Impaired Long-Lived Assets Held and Used [Line Items]                      
Asset Impairment Charges                     (12.0)
Fair Value, Inputs, Level 2
                      
Impaired Long-Lived Assets Held and Used [Line Items]                      
Impairment of Long-Lived Assets to be Disposed of                   $ 4.4 $ 6.9