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Fair Value Measurements Impairment losses (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items]      
Asset Impairment Charges $ 74.0 $ 2.4 $ 0
Other than temporary impairment 14.8 17.0 2.0
Gain (loss) on sale or impairment of long lived assets, net (73.9) (2.4) 2.5
Significant Other Observable Inputs (Level 2) [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Impairment charge of assets no longer used 6.9    
Impairment of Long-Lived Assets Held-for-use 4.9    
Other than temporary impairment   17.0  
Gain (loss) on sale or impairment of long lived assets, net   (0.9)  
Houlton [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Asset Impairment Charges $ 62.0