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Financial Instruments (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying amounts of assets under capital lease    
Gross assets under capital lease $ 18.0 $ 18.6
Less accumulated depreciation (3.9) (4.8)
Net assets under capital lease 14.1 13.8
Buildings
   
Carrying amounts of assets under capital lease    
Gross assets under capital lease 16.8 16.5
Machinery and equipment
   
Carrying amounts of assets under capital lease    
Gross assets under capital lease $ 1.2 $ 2.1